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Keiji Yashiro

Section

Graduate School of Environmental Studies

Job title

Professor

Degree

博士（工学）（東北大学）

researchmap

https://researchmap.jp/read0065475

J-GLOBAL ID

200901066850551358

ORCID

https://orcid.org/0000-0002-3539-1086

Researcher ID

T-9080-2019

Research History 10

2024/04 - Present

Tohoku University　Graduate School of Environmental Studies　Professor (cross appointment)
2023/04 - Present

Shimane University　Faculty of Materials for Energy　Professor
2013/04 - 2024/03

Graduate School of Environmental Studies, Tohoku University　Associate Professor
2013/01 - 2016/03

RIKEN　Harima Campus　Visiting researcher
2011/11 - 2015/03

JST　PRESTO researcher
2008/05 - 2013/03

IMRAM, Tohoku University　Senior Assistant Professor
2008/11 - 2009/10

Department of Materials, ETH Zurich (ETHZ)　Academic guest
2007/04 - 2008/04

IMRAM, Tohoku University　Assistant Professor
2001/04 - 2007/03

IMRAM, Tohoku University　Research Associate
2000/04 - 2001/03

RISM, Tohoku University　Research Associate

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Education 2

Tohoku University　Graduate School of Engineering

- 2000/03
Tohoku University　Faculty of Engineering　機械知能工学科

- 1998/03/25

Committee Memberships 9

公益社団法人電気化学会編集委員会　編集委員（Electrochemistry誌）

2024/03 - Present
公益社団法人電気化学会関西支部　幹事

2024/03 - Present
電気化学会固体化学の新しい指針を探る研究会　幹事（事務局）

2018/03 - Present
公益社団法人電気化学会　編集幹事、編集副幹事

2021/03 - 2023/03
公益社団法人電気化学会東北支部　幹事

2014/06 - 2023/03
公益社団法人電気化学会　編集委員

2018/04 - 2020/03
National Institute of Science and Technology Policy　Professional researcher

2013/07 - 2020/03
日本セラミックス協会　タイトルサービス委員

2000/04 - 2012/10
The Solid State Ionics Society of Japan　Secretariart

2006/01 - 2010/12

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Professional Memberships 6

The Japan Society of Mechanical Engineers

2017/03 - Present
The Ceramic Society of Japan

2000/05 - Present
The Electrochemical Society of Japan

2000/03 - Present
The Solid State Ionics Society of Japan

- Present
The SOFC Society of Japan

- Present
Japan Society of Calorimetry and Thermal Analysis

2008/11 - 2019/12

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Research Interests 4

high temperature electrolysis
Electrochemistry
Solid state ionics
SOFC

Research Areas 4

Nanotechnology/Materials / Energy chemistry / Fuel cells, Electrolysis, Solid oxide cells
Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Catalytic processes and resource chemistry /
Nanotechnology/Materials / Basic physical chemistry /
Nanotechnology/Materials / Inorganic materials / Solid state ionics, Solid electrohemistry

Awards 7

Engineering Computations 2018 Outstanding Paper

2018/08　Emerald Publshing
電気化学会第83回大会ポスター賞

2016/03/30　電気化学会燃料電池研究会　SrZr0.9Y0.1O3-d上でのLa0.6Sr0.4CoO3-d空気極における電気化学的特性評価
多元物質科学研究奨励賞

2007/12/12　東北大学多元物質科学研究所　固体イオニクス材料の基礎科学およびその場計測技術の開発
田川記念固体化学研究奨励賞

2007/03/30　社団法人電気化学会　高温電気化学反応場におけるその場測定への取り組み
Asian Symposium on Materials and Processing 2006, Best Paper Award

2006/11/09　Asian Symposium on Materials and Processing　A New Method for Evaluating Degradation of Solid Oxide Fuel Cell under Operating Conditions by Combining the Electrochemical Measuement with Non-Destructive Test
World Young Ceramist Meeting 2006 Presentation Award

2006/01/19　日本セラミックス協会　Nb-doped SrTiO3-based high-temperature devices
Outstanding Poster Award

2004/06/11　Asian society of solid state ionics　Hydrogen separation from reformed gases using high-temerature proton conductors

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Papers 275

Mitigating fracture risks in solid oxide fuel cells: Study on temperature dependence of residual stress and optimal design strategy upon sintering process Peer-reviewed

Junya Tanaka, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Toshiyuki Hashida

Journal of Power Sources　641　2025/06/15

DOI： 10.1016/j.jpowsour.2025.236850 　

ISSN： 0378-7753
Study on Ni-ceramic cathode degradation in H<inf>2</inf>O electrolysis using a two-dimensional patterned cell Peer-reviewed

Xiaolin Shao, Riyan Achmad Budiman, Takashi Sato, Mina Yamaguchi, Keiji Yashiro, Tatsuya Kawada

International Journal of Hydrogen Energy　120　201-212　2025/04/17

DOI： 10.1016/j.ijhydene.2025.03.236 　

ISSN： 0360-3199
In Situ Measurement of RedOx-Induced Stresses in Electrolyte of Anode-Supported Solid Oxide Fuel Cells Using the Cosα Method Peer-reviewed

Mina Yamaguchi, Takumi Komaya, Satoshi Watanabe, Keiji Yashiro, Kazuhisa Sato, Riyan Achmad Budiman, Tatsuya Kawada

Journal of The Electrochemical Society　2025/04/07

DOI： 10.1149/1945-7111/adc62d 　
Elucidating Factors Governing the Discrepancy of Oxygen Vacancy Concentration Between La_0.6Sr_0.4Co_1−yFe_yO_3−δ (y = 0, 0.2, 0.4, 0.6, 0.8, 1) Dense Film and Bulk Electrodes Peer-reviewed

Daichi Oi, Nanaha Miyashita, Riyan Achmad Budiman, Katherine Develos-Bagarinao, Yuta Kimura, Takashi Nakamura, Keiji Yashiro, Koji Amezawa, Tatsuya Kawada

Journal of The Electrochemical Society　172　(2)　024506-024506　2025/02/01
Publisher: The Electrochemical Society
DOI： 10.1149/1945-7111/adb216 　

ISSN： 0013-4651

eISSN： 1945-7111

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Dense film electrodes are used to understand the reaction mechanisms of solid oxide cells. However, the oxygen vacancy concentration, δ, in films differ from that in bulk materials, which can mislead the understanding of the reaction mechanism. Therefore, a comprehensive study was conducted to elucidate the differences in δ for the air electrode, La_0.6Sr_0.4Co_1−yFe_yO_3−δ (LSCF, y = 0, 0.2, 0.4, 0.6, 0.8, and 1), between film and bulk electrodes. Two key findings emerged: (1) For Co-rich compositions (y ≤ 0.5), significant differences in δ were observed between films and bulk electrodes, while (2) for Fe-rich compositions (y ≥ 0.6), there was almost no difference in δ. Plausible reasons for these discrepancies were investigated: (1) lattice stress in the film, (2) compositional variation within the film electrode, and (3) changes in the electronic conduction. High-temperature X-ray diffraction revealed no significant differences in lattice constant between films and bulk electrodes, and X-ray photoelectron spectroscopy and X-ray absorption spectroscopy indicated no changes in electronic structure. However, scanning transmission electron microscopy/energy dispersive X-ray spectroscopy revealed the presence of Co₃ O₄ formation within the film, suggesting local compositional variations. Therefore, the results indicate that local compositional differences are the most likely factor affecting δ in LSCF films.
High-temperature in situ stress monitoring of a co-fired electrolyte for metal-supported solid oxide cells Peer-reviewed

Mina Yamaguchi, Takumi Komaya, Zaka Ruhma, Satoshi Watanabe, Keiji Yashiro, Keigo Kumada, Kazuhisa Sato, Toshiyuki Hashida, Itaru Oikawa, Hitoshi Takamura, Riyan Achmad Budiman, Tatsuya Kawada

Journal of Power Sources　630　236147-236147　2025/02
Publisher: Elsevier BV
DOI： 10.1016/j.jpowsour.2024.236147 　

ISSN： 0378-7753
Investigating Ni nanoparticles on CeO₂ for methane dissociation: a comparative study of theoretical calculations and experimental insights Peer-reviewed

Fujisaki, T., Tsuji, Y., Tu, P.H., Doan, T.C.D., Rivera Rocabado, D.S., Staykov, A.T., Yashiro, K., Shiratori, Y.

Physical Chemistry Chemical Physics　27　(10)　2024/10

DOI： 10.1039/d4cp01324g 　

ISSN： 1463-9076
Microstructure Alteration Analysis of Ni/YSZ Cermet by Comb-shaped Ni Patterned Electrode Peer-reviewed

Nanako Bisaka, Takashi Sato, Riyan Achmad Budiman, Mina Yamaguchi, Tatsuya Kawada, Keiji Yashiro

Journal of the Electrochemical Society　171　(10)　2024/10/01

DOI： 10.1149/1945-7111/ad83f6 　

ISSN： 0013-4651

eISSN： 1945-7111
Review of factors affecting the performance degradation of Ni-YSZ fuel electrodes in solid oxide electrolyzer cells Peer-reviewed

Xiaolin Shao, Riyan Achmad Budiman, Takashi Sato, Mina Yamaguchi, Tatsuya Kawada, Keiji Yashiro

Journal of Power Sources　609　234651　2024/07/30

DOI： 10.1016/j.jpowsour.2024.234651 　

ISSN： 0378-7753
Evaluation of the effect of oxygen incorporation on the thermo–chemical–mechanical properties of the proton-conducting oxide BaZr<inf>0.8</inf>Yb<inf>0.2</inf>O<inf>3-δ</inf> Peer-reviewed

Taisei Segami, Ryuta Sato, Riyan Achmad Budiman, Mina Yamaguchi, Keiji Yashiro, Tatsuya Kawada

Acta Materialia　273　2024/07/01

DOI： 10.1016/j.actamat.2024.119978 　

ISSN： 1359-6454
Investigation of factors enhancing electrochemical properties of the porous La_0.6Sr_0.4CoO_3-δ–Ce_0.9Gd_0.1O_1.95 composite electrode for solid oxide fuel cell Peer-reviewed

Budiman, R.A., Sakuraba, J., Sakai, M., Yamaguchi, M., Hashimoto, S.-I., Yashiro, K., Kawada, T.

Solid State Ionics　417　2024

DOI： 10.1016/j.ssi.2024.116724 　

ISSN： 0167-2738
Investigation of degradation mechanisms by overpotential evaluation for protonic ceramic fuel cells Peer-reviewed

Hirofumi Sumi, Hiroyuki Shimada, Konosuke Watanabe, Yuki Yamaguchi, Katsuhiro Nomura, Yasunobu Mizutani, Ryuma Malik Matsuda, Masashi Mori, Keiji Yashiro, Takuto Araki, Yuji Okuyama

Journal of Power Sources　582　233528-233528　2023/10
Publisher: Elsevier BV
DOI： 10.1016/j.jpowsour.2023.233528 　

ISSN： 0378-7753
Oxygen vacancy concentration, electrochemical oxygen reduction, and performance stability of a LaNiO<inf>3-δ</inf> porous electrode Peer-reviewed

Riyan Achmad Budiman, Shin Ichi Hashimoto, Deni Shidqi Khaerudini, Keiji Yashiro, Tatsuya Kawada

Solid State Ionics　395　116215　2023/07

DOI： 10.1016/j.ssi.2023.116215 　

ISSN： 0167-2738
(High-Temperature Energy, Materials, & Processes Division Subhash Singhal Award) From Electrochemical to Mechanical Modeling of SOFCs and Their Experimental Validation

Tatsuya Kawada, Satoshi Watanabe, Riyan Achmad Budiman, Keiji Yashiro, Kazuhisa Sato, Toshiyuki Hashida, Yuta Kimura, Takashi Nakamura, Koji Amezawa, Masami Sato, Reika Nomura, Mayu Muramatsu, Kenjiro Terada

ECS Transactions　111　(6)　35-46　2023/05/19
Publisher: The Electrochemical Society
DOI： 10.1149/11106.0035ecst 　

ISSN： 1938-5862

eISSN： 1938-6737

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Tohoku University has been conducting research on the mechanical reliability of SOFCs under the financial support by NEDO (New Energy and Industrial technology Development Organization, Japan). Both numerical and experimental approaches have been taken at various levels, from electrochemical to structural analyses. An in-house code, SIMUDEL, was developed to simulate oxygen potential distribution inside the constituent materials in order to account for the chemical strain in cell/stack analyses. Non-linear stress-strain behaviors and inelastic deformation of the materials were characterized to improve the accuracy of the simulation. Predicting actual cell behavior, however, is still difficult, as unexpected factors often remain for each specific case. It is thus important to have in-situ or operando tools to observe the behavior of cells, such as deformation and stress generation. For that purpose, laser profilometer and X-ray stress analyzer were employed with a specially designed cell holder. Methods for evaluating local current density was also proposed. Currently, we are developing a protocol for testing robustness of planar SOFCs. Severe condition tests will be performed, and the results will be analyzed with the above-mentioned simulation.
Investigation on Reaction Mechanism in an SOFC Composite Cathode by Using Patterned Thin Film Electrodes

Zhuo Diao, Takaaki Imaizumi, Keita Mizuno, Yuta Kimura, Takashi Nakamura, Keiji Yashiro, Fumitada Iguchi, Tatsuya Kawada, Koji Amezawa

ECS Transactions　111　(6)　1145-1152　2023/05/19
Publisher: The Electrochemical Society
DOI： 10.1149/11106.1145ecst 　

ISSN： 1938-5862

eISSN： 1938-6737

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The reaction mechanism in an SOFC composite cathode was investigated by using patterned thin film model electrodes. In this work, we proposed new types of model electrodes, which could reproduce SOFCs cathodic reactions in a composite electrode of a mixed conducting electrode and an electrolyte. Then the model electrode was fabricated by choosing La_0.6Sr_0.4CoO_3-δ (LSC) and Ce_0.9Gd_0.1O_1.95 (GDC) as the electrode and the electrolyte, respectively. From the DC polarization measurements of the model electrode, it was found that making a composite of LSC and GDC can improve the cathodic performance especially at lower temperatures, possibly due to higher oxide ion conduction in GDC than LSC.
Study of Ni-YSZ Electrode Capacitance and Its Correlation with the Microstructure Peer-reviewed

Mirai Takeda, Keiji Yashiro, Riyan Achmad Budiman, Shinichi Hashimoto, Tatsuya Kawada

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　170　(3)　034505　2023/03

DOI： 10.1149/1945-7111/acc1a4 　

ISSN： 0013-4651

eISSN： 1945-7111
Deformation mechanism of Ni(O)-yttria-stabilized zirconia upon reduction and its effect on cell stress evolution in solid oxide fuel cells Peer-reviewed

Keiji Yashiro

Journal of Power Sources　550　(1)　232116-232124　2022/12

DOI： 10.1016/J.JPOWSOUR.2022.232116 　

ISSN： 0378-7753
Effects of temperature and hydrogen concentration during reduction on deformation behavior of NiO- yttria stabilized zirconia used in solid oxide fuel cells Peer-reviewed

Junya Tanaka, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Toshiyuki Hashida

Journal of Power Sources　535　231384-231384　2022/07
Publisher: Elsevier BV
DOI： 10.1016/j.jpowsour.2022.231384 　

ISSN： 0378-7753
Performance and stability analysis of SOFC containing thin and dense gadolinium-doped ceria interlayer sintered at low temperature Peer-reviewed

Yige Wang, Chuan Jia, Zewei Lyu, Minfang Han, Junwei Wu, Zaihong Sun, Fumitada Iguchi, Keiji Yashiro, Tatsuya Kawada

Journal of Materiomics　8　(2)　347-357　2022/05
Publisher: Elsevier BV
DOI： 10.1016/j.jmat.2021.09.001 　

ISSN： 2352-8478
In Situ Evaluation of the Influence of Interstitial Oxygen on the Elastic Modulus of La2NiO4

Yuta Kimura, Takashi Nakamura, Koji Amezawa, Keiji Yashiro, Tatsuya Kawada

Metals　11　(12)　1889-1889　2021/11/24
Publisher: MDPI AG
DOI： 10.3390/met11121889 　

eISSN： 2075-4701

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Lattice defects significantly affect the mechanical properties of crystalline metal oxides. The materials for the components of solid oxide fuel cells (SOFCs) are no exception, and hence understanding of the interplay between lattice defects and the mechanical properties of components is important to ensure the mechanical stability of SOFCs. Herein, we performed an in situ evaluation of the temperature and P(O2) dependence of the elastic moduli of La2NiO4 (LN214), a candidate for the cathode material of SOFCs, using the resonance method to understand the influence of interstitial oxygen on its elastic properties. Above 873 K, both the Young’s and shear moduli of LN214 slightly decreased with increasing P(O2), suggesting that these elastic moduli are correlated with interstitial oxygen concentration and decreased with increasing interstitial oxygen. We analyzed the influence of interstitial oxygen on the Young’s modulus of LN214, based on numerically obtained lattice energy. The P(O2) dependence of the Young’s modulus of LN214 was found to be essentially explained by variation in the c-lattice constant, which was triggered by variation in interstitial oxygen concentration. These findings may contribute to a better understanding of the relationship between lattice defects and mechanical properties, and to the improvement of the mechanical stability of SOFCs.
Metal-supported sofc fabricated by tape casting and its characterization: A study of the co-sintering process

Zaka Ruhma, Keiji Yashiro, Itaru Oikawa, Hitoshi Takamura, Tatsuya Kawada

Journal of Engineering and Technological Sciences　53　(5)　2021/10/04

DOI： 10.5614/j.eng.technol.sci.2021.53.5.11 　

ISSN： 2337-5779

eISSN： 2338-5502
Relationship between microstructure and deformation of porous Ni-based cermets under redox cycling

Kazuhisa Sato, Satoshi Watanabe, Yihui Huang, Taihei Miyasaka, Toshiaki Matsui, Keiji Yashiro, Tatsuya Kawada, Koji Amezawa, Keigo Kumada, Koichi Eguchi

SN Applied Sciences　3　(10)　2021/10
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s42452-021-04789-w 　

ISSN： 2523-3963

eISSN： 2523-3971

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<title>Abstract</title>This paper discusses the relationship between the elongation and compression behavior and microstructural changes under redox cycles of porous Ni(O)–YSZ cermets for solid oxide fuel cells (SOFC). Mechanical damage in SOFC and SOEC is one of the most important degradation factors governing the electrical performance of cells. Therefore, it is necessary to know the mechanical properties of each component material, such as elastic and deformation properties, in the operating environment. Particularly, of the Ni(O)–YSZ cermets which currently makes up 90% of the volume of the cell, with present mainstream anode supported SOFC and SOEC. Therefore, understanding the properties of the Ni(O)–YSZ cermets plays an important role in ensuring the performance of the entire SOFC and SOEC. In this study, the microstructural changes of Ni(O)–YSZ cermet by reduction, re-oxidation and re-reduction were observed in detail using microstructural observations and systematically compared with the dimensional change behavior. For the dimensional change behavior, a simple model considering the initial porosity and Ni content is proposed, which successfully predicts the dimensional change due to re-oxidation. Furthermore, Ni(O)–YSZ cermets with high Ni content show large initial dimensional changes, but the dimensional reversibility improves with increase of the number of redox cycles.
Modulating Reaction Pathways on Perovskite Cobaltite Nanofibers through Excessive Surface Oxygen Defects for Efficient Water Oxidation Peer-reviewed

Qiuyu Liu, Chenghao Jia, Mengzhen Zhou, Zuyun He, Zhiheng Gong, Yihan Ling, Xinxin Wang, Keiji Yashiro, Yan Chen

Energy and Fuels　35　(17)　13967-13974　2021/09/02

DOI： 10.1021/acs.energyfuels.1c01998 　

ISSN： 0887-0624

eISSN： 1520-5029
Comparison of Residual Stress Measurement Methods in Solid Oxide Fuel Cell Peer-reviewed

Kento Oshima, Takumi Komaya, Keiji Yashiro, Fumitada Iguchi, Minfang Han, Yige Wang, Tatsuya Kawada

ECS Transactions　103　(1)　1251-1260　2021/07/09
Publisher: The Electrochemical Society
DOI： 10.1149/10301.1251ecst 　

ISSN： 1938-5862

eISSN： 1938-6737
Evaluation of Reaction Mechanism of PCFC Composite Cathodes by Utilizing Patterned Thin Film Model Electrodes Peer-reviewed

Zhuo Diao, Katsuya Nishidate, Takaaki Imaizumi, Yuta Kimura, Takashi Nakamura, Yuichi Mikami, Tomohiro Kuroha, Keiji Yashiro, Tatsuya Kawada, Koji Amezawa

ECS Transactions　103　(1)　1745-1751　2021/07/09
Publisher: The Electrochemical Society
DOI： 10.1149/10301.1745ecst 　

ISSN： 1938-5862

eISSN： 1938-6737
Corrigendum to evaluation of electrochemical properties of LaNi0.6Fe0.4O3- - Ce0.9Gd0.1O1.95 composite as air electrode for SOFC solid state ionics, 332, 2019, 70–76

R.A. Budiman, S. Hashimoto, Y. Fujimaki, T. Nakamura, K. Yashiro, K. Amezawa, T. Kawada

Solid State Ionics　363　115608-115608　2021/05
Publisher: Elsevier BV
DOI： 10.1016/j.ssi.2021.115608 　

ISSN： 0167-2738
Evaluation of the Electrode Reaction Mechanism of Protonic Ceramic Fuel Cell Cathode by Using Model Electrodes Peer-reviewed

20　(4)　72-79　2021/04
Improving the activity and stability of Ni-based electrodes for solid oxide cells through surface engineering: Recent progress and future perspectives

Pan, J., Ye, Y., Zhou, M., Sun, X., Ling, Y., Yashiro, K., Chen, Y.

Materials Reports: Energy　1　(2)　2021

DOI： 10.1016/j.matre.2021.100025 　

ISSN： 2666-9358
Determination of relevant factors affecting the surface oxygen exchange coefficient of solid oxide fuel cell cathode with ionic conducting oxide coating Peer-reviewed

R. A. Budiman, H. J. Hong, S. Hashimoto, K. Yashiro, K. D. Bagarinao, H. Kishimoto, K. Yamaji, T. Kawada

Solid State Ionics　353　2020/10/01

DOI： 10.1016/j.ssi.2020.115372 　

ISSN： 0167-2738
Influences of Ni content and porosity on mechanical properties of Ni–YSZ composites under solid oxide fuel cell operating conditions Peer-reviewed

Satoshi Watanabe, Shinji Sukino, Taihei Miyasaka, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Toshiyuki Hashida

Journal of Materials Science　55　(20)　8679-8693　2020/07/01

DOI： 10.1007/s10853-020-04624-4 　

ISSN： 0022-2461

eISSN： 1573-4803
A new development strategy of light weight solid oxide fuel cells for electrified airplane system Peer-reviewed

S. Hashimoto, K. Yashiro, T. Kawada, N. Kijima, T. Tsuchiya, T. Manabe, T. Kojima, K. Okai, T. Hirota, K. Suzuki, T. Namioka, H. Ito, R. Miyata, H. Takamura, K. Yoshimi, K. Kobayashi

2019 AIAA/IEEE Electric Aircraft Technologies Symposium, EATS 2019　2019/08

DOI： 10.2514/6.2019-4470 　
Evaluation of electrochemical properties of LaNi <inf>0.6</inf> Fe <inf>0.4</inf> O <inf>3−δ</inf> - Ce <inf>0.9</inf> Gd <inf>0.1</inf> O <inf>1.95</inf> composite as air electrode for SOFC

R. A. Budiman, S. Hashimoto, Y. Fujimaki, T. Nakamura, K. Yashiro, K. Amezawa, T. Kawada

Solid State Ionics　332　70-76　2019/04

DOI： 10.1016/j.ssi.2018.12.023 　

ISSN： 0167-2738
Evaluation method of current distribution in SOFC in operation Peer-reviewed

T. Tsuchikura, T. Sakamoto, T. Zukawa, H. Sumi, K. Sato, K. Yashiro, T. Hashida, T. Kawada

ECS Transactions　91　(1)　579-588　2019

DOI： 10.1149/09101.0579ecst 　

ISSN： 1938-6737

eISSN： 1938-5862
Contraction of porous nickel during low temperature oxidation Peer-reviewed

Y. Morishita, F. Zhao, S. Watanabe, K. Yashiro, T. Kawada

ECS Transactions　91　(1)　1979-1984　2019

DOI： 10.1149/09101.1979ecst 　

ISSN： 1938-6737

eISSN： 1938-5862
Study of CaTiO<inf>3</inf> based ionic conductors for lightweight SOFCs Peer-reviewed

K. Suzuki, Y. Kouchi, T. Hirota, H. Kato, T. Namioka, H. Ito, Hyun Jin Hong, K. Yashiro, T. Kawada, K. Okai, S. Hashimoto

ECS Transactions　91　(1)　1217-1222　2019

DOI： 10.1149/09101.1217ecst 　

ISSN： 1938-6737

eISSN： 1938-5862
Evaluation of titanium based alloys as interconnects for the light weight SOFC system Peer-reviewed

K. Kobayashi, R. Miyata, K. Yashiro, H. Takamura, K. Yoshimi, T. Kawada, S. Hashimoto, K. Okai

ECS Transactions　91　(1)　2279-2290　2019

DOI： 10.1149/09101.2279ecst 　

ISSN： 1938-6737

eISSN： 1938-5862
Variation of mechanical properties of YSZ upon cubic to tetragonal phase transformation promoted by impurity Ni Peer-reviewed

H. Umemura, C. Sekizawa, S. Watanabe, K. Yashiro, T. Kawada

ECS Transactions　91　(1)　837-845　2019

DOI： 10.1149/09101.0837ecst 　

ISSN： 1938-6737

eISSN： 1938-5862
Correlation between electrode reaction and chromium deposition in SOFC cathodes Peer-reviewed

S. Kageyama, Y. Shindo, Y. Fujimaki, K. Mizuno, Y. Kimura, T. Nakamura, F. Iguchi, K. Yashiro, H. Yugami, T. Kawada, K. Amezawa

ECS Transactions　91　(1)　1231-1237　2019

DOI： 10.1149/09101.1231ecst 　

ISSN： 1938-6737

eISSN： 1938-5862
Material development strategy of lightweight solid oxide fuel cells for airplane system electrification Peer-reviewed

S. Hashimoto, T. Hirota, K. Suzuki, T. Namioka, H. Ito, R. Miyata, K. Kobayashi, K. Yashiro, H. Takamura, T. Kawada, K. Yoshimi, N. Kijima, T. Manabe, T. Tsuchiya, T. Kojima, K. Okai

ECS Transactions　91　(1)　311-318　2019

DOI： 10.1149/09101.0311ecst 　

ISSN： 1938-6737

eISSN： 1938-5862
Influence of Electrode Reaction on Cr-poisoning in SOFC MIEC Cathodes Peer-reviewed

Shota Kageyama, Yusuke Shindo, Yoshinobu Fujimaki, Keita Mizuno, Yuta Kimura, Takashi Nakamura, Fumitada Iguchi, Keiji Yashiro, Hiroo Yugami, Tatsuya Kawada, Koji Amezawa

13th European SOFC & SOE Forum 2018, Chapter 12　51-58　2018/07

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Chapter12-Sessions B14,B15-51/169
Investigation of Electrode Reaction in Proton Conducting Ceramic Fuel Cell by Using Pattenred Thin Film Model Electrode Peer-reviewed

Yuki Shinomiya, Yoshinobu Fujimaki, Keita Mizuno, Shota Kageyama, Takashi Nakamura, Yuta Kimura, Fumitada Iguchi, Keiji Yashiro, Hiroo Yugami, Tatsuya Kawada, Koji Amezawa

13th European SOFC & SOE Forum 2018, Chapter 08　77-82　2018/07

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Chapter08-Sessions B03,B06-77/169
Impact of Triple Phase Boundary Reaction in SOFC Mixed Conducting Cathodes Peer-reviewed

Keita Mizuno, Yoshinobu Fujimaki, Takashi Nakamura, Yuta Kimura, Kiyofumi Nitta, Oki Sekizawa, Yasuko Terada, Fumitada Iguchi, Keiji Yashiro, Hiroo Yugami, Tatsuya Kawada, Koji Amezawa

13th European SOFC & SOE Forum 2018, Chapter 08　68-76　2018/07

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Chapter08-Sessions B03,B06-68/169
Investigation of rate-determining step of LaNi0.6Co0.4O3-δ film electrode

R. A. Budiman, Y. Uzumaki, S. Hashimoto, T. Nakamura, K. Yashiro, K. D. Bagarinao, H. Kishimoto, K. Yamaji, T. Horita, K. Amezawa, T. Kawada

Journal of Solid State Electrochemistry　22　(7)　2227-2235　2018/07/01
Publisher: Springer New York LLC
DOI： 10.1007/s10008-018-3935-x 　

ISSN： 1432-8488
Shape deformation analysis of anode-supported solid oxide fuel cell by electro-chemo-mechanical simulation

Mayu Muramatsu, Masami Sato, Kenjiro Terada, Satoshi Watanabe, Keiji Yashiro, Tatsuya Kawada, Fumitada Iguchi, Harumi Yokokawa

Solid State Ionics　319　194-202　2018/06/01
Publisher: Elsevier B.V.
DOI： 10.1016/j.ssi.2018.01.027 　

ISSN： 0167-2738
Thermochemical CO2 dissociation using Ce0.8Zr0.15Sc0.05O2-δ

Ryo Hishinuma, Keiji Yashiro, Shin-ichi Hashimoto, Tatsuya Kawada

Solid State Ionics　317　103-107　2018/04/01
Publisher: Elsevier B.V.
DOI： 10.1016/j.ssi.2018.01.006 　

ISSN： 0167-2738
Electrochemical performance of LaNi0.6Co0.4O3--Ce0.9Gd0.1O1.95 composite electrode and evaluation of its effective reaction length

Keiji Yashiro

Journal of Solid State Electrochemistry　22　3955-3963　2018/01/01

DOI： 10.1007/S10008-018-4102-0 　

ISSN： 1432-8488
Simulation of ferroelastic phase formation using phase-field model

M. Muramatsu, K. Yashiro, T. Kawada, K. Terada

International Journal of Mechanical Sciences　146-147　462-474　2018
Publisher: Elsevier Ltd
DOI： 10.1016/j.ijmecsci.2017.12.027 　

ISSN： 0020-7403
Oxygen reduction reaction process of LaNi0.6Fe0.4O3 (-) (delta) film - porous Ce0.9Gd0.1O1.95 heterostructure electrode Peer-reviewed

R. A. Budiman, S. Hashimoto, T. Nakamura, K. Yashiro, K. D. Bagarinao, H. Kishimoto, K. Yamaji, T. Horita, K. Amezawa, T. Kawada

SOLID STATE IONICS　312　80-87　2017/12

DOI： 10.1016/j.ssi.2017.10.007 　

ISSN： 0167-2738

eISSN： 1872-7689
Electronic conduction mechanism and defect chemical model of LaNi0.4Fe0.6O3- (delta) Peer-reviewed

R. A. Budiman, H. J. Hong, S. Hashimoto, T. Nakamura, K. Yamaji, K. Yashiro, K. Amezawa, T. Kawada

SOLID STATE IONICS　310　148-153　2017/11

DOI： 10.1016/j.ssi.2017.08.014 　

ISSN： 0167-2738

eISSN： 1872-7689
Self-modification of Ni Metal Surfaces with CeO2 to Suppress Carbon Deposition at Solid Oxide Fuel Cell Anodes Peer-reviewed

J. Kubota, S. Hashimoto, T. Shindo, K. Yashiro, T. Matsui, K. Yamaji, H. Kishimoto, T. Kawada

FUEL CELLS　17　(3)　402-406　2017/06

DOI： 10.1002/fuce.201600180 　

ISSN： 1615-6846

eISSN： 1615-6854
Mechanical strength evaluation of YSZ, GDC and LSCF under SOFC operating conditions Peer-reviewed

S. Watanabe, K. Sato, F. Iguchi, K. Yashiro, T. Hashida, T. Kawada

ECS Transactions　78　(1)　2181-2190　2017/05/30
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07801.2181ecst 　

ISSN： 1938-6737 1938-5862
Contribution of triple-phase boundary reaction in cathodic reaction of solid oxide fuel cell Peer-reviewed

Y. Fujimaki, K. Mizuno, Y. Kimura, T. Nakamura, K. Develos-Bagarinao, K. Yamaji, K. Yashiro, T. Kawada, F. Iguchi, H. Yugami, K. Amezawa

ECS Transactions　78　(1)　847-853　2017/05/30
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07801.0847ecst 　

ISSN： 1938-6737 1938-5862
Mechanism of chromium poisoning in SOFC cathode investigated by using pattern thin film model electrode Peer-reviewed

K. Amezawa, Y. Shindo, Y. Fujimaki, Y. Kimura, T. Nakamura, F. Iguchi, K. Yashiro, H. Yugami, T. Kawada

ECS Transactions　78　(1)　965-970　2017/05/30
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07801.0965ecst 　

ISSN： 1938-6737 1938-5862
Materials properties for the simulation of electro-chemo-mechanical coupling behavior of SOFC Peer-reviewed

K. Yashiro, T. Kawada, S. Watanabe, M. Muramatsu, T. Sakamoto, S. I. Hashimoto, K. Terada, M. Sato, T. Hashida, K. Sato, F. Iguchi, H. Yugami, K. Amezawa, T. Nakamura, Y. Kimura, A. Unemoto

ECS Transactions　78　(1)　2309-2316　2017/05/30
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07801.2309ecst 　

ISSN： 1938-6737 1938-5862

eISSN： 1938-6737
Simulation Technology on SOFC Durability With an Emphasis on Conductivity Degradation of ZrO2-Base Electrolyte Peer-reviewed

Harumi Yokokawa, Haruo Kishimoto, Taro Shimonosono, Katsuhiko Yamaji, Mayu Muramatsu, Kenjiro Terada, Keiji Yashiro, Tatsuya Kawada

JOURNAL OF ELECTROCHEMICAL ENERGY CONVERSION AND STORAGE　14　(1)　011004　2017/02

DOI： 10.1115/1.4036038 　

ISSN： 2381-6872

eISSN： 2381-6910
A simulation of large scale sediment flow experiment using DEM Peer-reviewed

Masai SATO, Mayu MURAMATSU, Kenjiro TERADA, Satoshi WATANABE, Keiji YASHIRO, Tatsuya KAWADA, Harumi YOKOKAWA

Transactions of JSCES　20170004　2017/01/29

DOI： 10.11421/jsces.2017.20170004 　
NUMERICAL PLATE TESTING FOR NON-LINEAR MULTI-SCALE ANALYSIS OF PLATE-SHAPED DEVICE Peer-reviewed

SATO Masami, MURAMATSU Mayu, MATSUBARA Seishiro, NISHI Shinnosuke, TERADA Kenjiro, YASHIRO Keiji, KAWADA Tatsuya

Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))　73　(2)　I_283-I_294　2017
Publisher: 公益社団法人土木学会

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We propose a new method of multi-scale analysis for plate-like devices such as a flat plate cell of solid oxide fuel cell (SOFC), which is classified into a composite plate composed of in-plane periodic structures. To characterize the macroscopic nonlinear mechanical behavior of the in-plane periodic structure, the method of numerical plate testing is employed. Since the obtained relationships between macroscopic generalized strains and stress cannot be represented by an equivalent homogeneous plate with a single material, we introduce a surrogate model composed of homogeneous layers that is expected to exhibit the same macroscopic responses. After the material parameters of these layers are identified, the macroscopic analysis becomes possible by use of a laminated structure with continuum solid shell elements available in a general-purpose finite element program. Representative numerical examples are presented to demonstrate the capability of the proposed multi-scale analysis method.
Numerical simulations of non-stationary distributions of electrochemical potentials in SOFC Peer-reviewed

Mayu Muramatsu, Keiji Yashiro, Tatsuya Kawada, Kenjiro Tarada

ENGINEERING COMPUTATIONS　34　(6)　1956-1988　2017

DOI： 10.1108/EC-08-2016-0311 　

ISSN： 0264-4401

eISSN： 1758-7077
Effect of a (La,Sr)(2)CoO4 phase on the oxygen exchange reaction of dense and porous (La,Sr)CoO3 electrodes Peer-reviewed

T. Kawada, K. Yashiro, S. I. Hashimoto, K. Amezawa

SOLID-GAS ELECTROCHEMICAL INTERFACES 2 (SGEI 2)　77　(10)　9-14　2017

DOI： 10.1149/07710.0009ecst 　

ISSN： 1938-5862
Triple Phase Boundary Reaction in a Mixed-Conducting SOFC Cathode Invited Peer-reviewed

K. Amezawa, Y. Fujimaki, K. Mizuno, Y. Kimura, T. Nakamura, K. Nitta, Y. Terada, F. Iguchi, K. Yashiro, H. Yugami, T. Kawada

SOLID-GAS ELECTROCHEMICAL INTERFACES 2 (SGEI 2)　77　(10)　41-47　2017

DOI： 10.1149/07710.0041ecst 　

ISSN： 1938-5862
Modification of oxygen surface exchange kinetics on a Dense film of La0.6Sr0.4CoO3-δ by application of porous (La,Sr)2CoO4 Peer-reviewed

T. Kawada, T. Tairako, K. Nagao, A. Unemoto, M. Sase, K. Yashiro, S. Hashimoto, K. Amezawa

16th International Conference on Nanotechnology - IEEE NANO 2016　365-366　2016/11/21
Publisher: Institute of Electrical and Electronics Engineers Inc.
DOI： 10.1109/NANO.2016.7751558 　
Erratum: Corrigendum to “Oxygen nonstoichiometry and transport properties of LaNi0.6Co0.4O3 − δ” (Solid State Ionics (2016) 292 (52–58)) Peer-reviewed

R. A. Budiman, Y. Uzumaki, H. J. Hong, T. Miyazaki, S. Hashimoto, T. Nakamura, K. Yashiro, K. Amezawa, T. Kawada

Solid State Ionics　294　1　2016/10/15
Publisher: Elsevier
DOI： 10.1016/j.ssi.2016.06.017 　

ISSN： 0167-2738
Oxygen nonstoichiometry and transport properties of LaNi0.6Co0.4O3 (-) (delta) (vol 292, pg 52, 2016) Peer-reviewed

Keiji Yashiro

SOLID STATE IONICS　294　116-116　2016/10/15

DOI： 10.1016/j.ssi.2016.06.017} 　

ISSN： 0167-2738
Oxygen nonstoichiometry and transport properties of LaNi0.6Co0.4O3-delta Peer-reviewed

R. A. Budiman, Y. Uzumaki, H. J. Hong, T. Miyazaki, S. Hashimoto, T. Nakamura, K. Yashiro, K. Amezawa, T. Kawada

SOLID STATE IONICS　292　52-58　2016/09

DOI： 10.1016/j.ssi.2016.05.005 　

ISSN： 0167-2738

eISSN： 1872-7689
Electrochemical Impedance Spectroscopy of High-Efficiency Hydrogen Membrane Fuel Cells Based on Sputter-Deposited BaCe0.8Y0.2O3-delta Thin Films Peer-reviewed

Yoshitaka Aoki, Shohei Kobayashi, Tomoyuki Yamaguchi, Etsushi Tsuji, Hiroki Habazaki, Keiji Yashiro, Tetsuya Kawada, Toshiaki Ohtsuka

JOURNAL OF PHYSICAL CHEMISTRY C　120　(29)　15976-15985　2016/07

DOI： 10.1021/acs.jpcc.5b12593 　

ISSN： 1932-7447

eISSN： 1932-7455
Tailoring the chemical stability of cobalt-rich perovskite mixed conductor Peer-reviewed

Fang Wang, Koki Igarashi, Takashi Nakamura, Keiji Yashiro, Junichiro Mizusaki, Koji Amezawa

SOLID STATE IONICS　288　(SI)　2-5　2016/05

DOI： 10.1016/j.ssi.2016.01.018 　

ISSN： 0167-2738

eISSN： 1872-7689
Determination of oxygen surface exchange constant of LaNi0.6Fe0.4O3-delta coated with Ce0.9Gd0.1O1.95 by isotope exchange technique Peer-reviewed

R. A. Budiman, T. Miyazaki, S. Hashimoto, K. Yashiro, T. Kawada

SOLID STATE IONICS　286　19-23　2016/03

DOI： 10.1016/j.ssi.2015.12.002 　

ISSN： 0167-2738

eISSN： 1872-7689
Thermal properties of perovskite-type oxides La0.6Sr0.4Co1-xFexO3-δ (0 ≤ x ≤1.0) Peer-reviewed

Yu-Cheol Shin, Shin-Ichi Hashimoto, Keiji Yashiro, Koji Amezawa, Tatsuya Kawada

ECS Transactions　72　(7)　105-110　2016
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07207.0105ecst 　

ISSN： 1938-5862 1938-6737
Bulk- and powder surface exchange coefficients of (La,Sr)Co03-d Peer-reviewed

H. Chiba, K. Yashiro, S. Hashimoto, T. Kawada

ECS Transactions　75　(42)　69-74　2016
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07542.0069ecst 　

ISSN： 1938-5862 1938-6737
The origin of instability of lanthanum strontium cobalt ferrite La0.6Sr0.4Co0.2Fe0.8O3-δ under oxygen potential gradient Peer-reviewed

X. Wang, T. Miyazaki, K. Yashiro, S. Hashimoto, T. Kawada

ECS Transactions　75　(28)　1-9　2016
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07528.0001ecst 　

ISSN： 1938-5862 1938-6737
Characterization of time-varying macroscopic electro-chemo-mechanical behavior of SOFC subjected to Ni-sintering in cermet microstructures Peer-reviewed

M. u Muramatsu, K. Terada, T. Kawada, K. Yashiro, K. Takahashi, S. Takase

COMPUTATIONAL MECHANICS　56　(4)　653-676　2015/10

DOI： 10.1007/s00466-015-1193-7 　

ISSN： 0178-7675

eISSN： 1432-0924
AN ELECTRO-CHEMO-MECHANICAL ANALYSIS OF SOLID OXIDE FUEL CELL CONSIDERING EVOLUTION OF MICROSTRUCTURE IN POROUS ELECTRODE USING PHASE-FIELD METHOD Peer-reviewed

Muramatsu M, Takase S, Yashiro K, Kawada T, Terada K

Coupled Problems in Science and Engineering VI　614-624　2015
A MULTI-SCALE ELECTRO-CHEMO-MECHANICAL ANALYSIS OF SOLID OXIDE FUEL CELL CONSIDERING EVOLUTION OF MICROSTRUCTURE IN POROUS ELECTRODE Peer-reviewed

Muramatsu M, Takase S, Yashiro K, Kawada T, Terada K

PROCEEDINGS OF THE 1ST PAN-AMERICAN CONGRESS ON COMPUTATIONAL MECHANICS AND XI ARGENTINE CONGRESS ON COMPUTATIONAL MECHANICS　215-224　2015
Determination of effective reaction area in a mixed-conducting SOFC cathode Peer-reviewed

K. Amezawa, Y. Fujimaki, T. Nakamura, K. D. Bagarinao, K. Yamaji, K. Nitta, Y. Terada, F. Iguchi, K. Yashiro, H. Yugami, T. Kawada

ECS Transactions　66　(2)　129-135　2015
Publisher: Electrochemical Society Inc.
DOI： 10.1149/06602.0129ecst 　

ISSN： 1938-6737 1938-5862
Surface modification of LaNi<inf>0.6</inf>Fe<inf>0.4</inf>O<inf>3-δ</inf> film electrode by Ce<inf>0.9</inf>Gd<inf>0.1</inf>O<inf>1.95</inf> porous layer Peer-reviewed

R. A. Budiman, T. Miyazaki, S. Hashimoto, K. Yashiro, K. Amezawa, T. Kawada

ECS Transactions　66　(2)　161-168　2015
Publisher: Electrochemical Society Inc.
DOI： 10.1149/06602.0161ecst 　

ISSN： 1938-6737 1938-5862
Oxygen nonstoichiometry and electrochemical properties of LaNiO<inf>3-δ</inf> Peer-reviewed

R. A. Budiman, S. Hashimoto, T. Nakamura, K. Yashiro, K. Amezawa, T. Kawada

ECS Transactions　66　(2)　177-183　2015
Publisher: Electrochemical Society Inc.
DOI： 10.1149/06602.0177ecst 　

ISSN： 1938-6737 1938-5862
Electrochemical Study of LaNi0.6Fe0.4O3-delta Film Electrode Peer-reviewed

R. A. Budiman, T. Miyazaki, S. Hashimoto, T. Nakamura, K. Yashiro, K. Amezawa, T. Kawada

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　162　(14)　F1445-F1450　2015

DOI： 10.1149/2.0391514jes 　

ISSN： 0013-4651

eISSN： 1945-7111
Quantitative evaluation of electrochemically active area in an sofc cathode by oxygen isotopic exchange measurements of a model patterned electrode Peer-reviewed

Y. Fujimaki, T. Nakamura, K. Develos-Bagarinao, K. Yamaji, K. Yashiro, T. Kawada, F. Iguchi, H. Yugami, K. Amezawa

ECS Transactions　68　(1)　623-630　2015
Publisher: Electrochemical Society Inc.
DOI： 10.1149/06801.0623ecst 　

ISSN： 1938-6737 1938-5862
Direct observation of the current distributions across SOFC by measuring the lateral voltage differences Peer-reviewed

Abhilasha S. Devaraj, Keiji Yashiro, Shin-Ichi Hashimoto, Tatsuya Kawada

ECS Transactions　68　(1)　2075-2081　2015
Publisher: Electrochemical Society Inc.
DOI： 10.1149/06801.2075ecst 　

ISSN： 1938-6737 1938-5862
Electro-chemical potential analysis of zirconium based on the reaction-diffusion equations of oxygen ion and electron considering phase transformation Peer-reviewed

M. Muramatsu, H. Kishimoto, K. Yamaji, K. Yashiro, T. Kawada, K. Terada, H. Yokokawa

ECS Transactions　68　(1)　2363-2372　2015
Publisher: Electrochemical Society Inc.
DOI： 10.1149/06801.2363ecst 　

ISSN： 1938-6737 1938-5862

eISSN： 1938-6737
Evaluation of High-temperature Electronic and Electrochemical Properties of the Strained La1-xSrxCoO3-delta Films Prepared by a Pulsed Laser Deposition Technique Peer-reviewed

Takashi Nakamura, Daisuke Hemmi, Katsutoshi Iwamoto, Nobuyuki Hirai, Maya Sase, Atsushi Unemoto, Fumimasa Horikiri, Yoshihiro Mori, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Junichiro Mizusaki

ELECTROCHEMISTRY　82　(10)　884-890　2014/10

DOI： 10.5796/electrochemistry.82.884 　

ISSN： 1344-3542
Effect of Nb doping on the chemical stability of BSCF-based solid solutions Peer-reviewed

Fang Wang, Takashi Nakamura, Keiji Yashiro, Junichiro Mizusaki, Koji Arnezawa

SOLID STATE IONICS　262　(SI)　719-723　2014/09

DOI： 10.1016/j.ssi.2014.01.045 　

ISSN： 0167-2738

eISSN： 1872-7689
Development of in situ soft X-ray absorption spectroscopic technique under high temperature and controlled atmosphere Peer-reviewed

Ryo Oike, Koji Amezawa, Takashi Nakamura, Yusuke Tamenori, Keiji Yashiro, Tatsuya Kawada

SOLID STATE IONICS　262　(SI)　911-913　2014/09

DOI： 10.1016/j.ssi.2014.01.005 　

ISSN： 0167-2738

eISSN： 1872-7689
Oxide ion and electron transport properties in lanthanum silicate oxyapatite ceramics Peer-reviewed

Atsushi Mineshige, Hiroyuki Mieda, Mitsuaki Manabe, Takahiro Funahashi, Yusuke Daiko, Tetsuo Yazawa, Mina Nishi, Katsuhiko Yamaji, Teruhisa Horita, Koji Amezawa, Keiji Yashiro, Tatsuya Kawada, Hideki Yoshioka

SOLID STATE IONICS　262　(SI)　555-558　2014/09

DOI： 10.1016/j.ssi.2014.04.009 　

ISSN： 0167-2738

eISSN： 1872-7689
Simulation of oxygen diffusion process on electrical conductivity relaxation Peer-reviewed

Honami Kudo, Keiji Yashiro, Shin-ichi Hashimoto, Koji Amezawa, Tatsuya Kawada

SOLID STATE IONICS　262　(SI)　696-700　2014/09

DOI： 10.1016/j.ssi.2014.01.009 　

ISSN： 0167-2738

eISSN： 1872-7689
Analysis of structural phase transition behavior of Ln(2)NiO(4) (+) (delta) (Ln: Nd, Pr) with variation of oxygen content Peer-reviewed

Eiki Niwa, Kazuya Wakai, Tetsuya Hon, Takashi Nakamura, Keiji Yashiro, Junichiro Mizusaki, Takuya Hashimoto

SOLID STATE IONICS　262　(SI)　724-727　2014/09

DOI： 10.1016/j.ssi.2014.03.031 　

ISSN： 0167-2738

eISSN： 1872-7689
Crystal structure and thermal expansion behavior of oxygen stoichiometric lanthanum strontium manganite at high temperature Peer-reviewed

Yoshikazu Shirai, Shin-Ichi Hashimoto, Kazuhisa Sato, Keiji Yashiro, Koji Amezawa, Junichiro Mizusaki, Tatsuya Kawada

SOLID STATE IONICS　256　83-88　2014/03

DOI： 10.1016/j.ssi.2013.12.042 　

ISSN： 0167-2738

eISSN： 1872-7689
Transient shift of local oxygen potential in nonstoichiometric oxides upon application of mechanical stress Peer-reviewed

Tatsuya Kawada, Tomohisa Masumitsu, Yuta Kimura, Satoshi Watanabe, Shin-ichi Hashimoto, Keiji Yashiro, Koji Amezawa

JOURNAL OF ELECTROCERAMICS　32　(1)　78-85　2014/02

DOI： 10.1007/s10832-013-9885-x 　

ISSN： 1385-3449

eISSN： 1573-8663
Conduction Properties and Ionic Transference Behavior of CaTi1-XScxO3-delta (x=0.05, 0.1) Peer-reviewed

H. J. Hong, K. Yashiro, S. Hashimoto, T. Kawada

IONIC AND MIXED CONDUCTING CERAMICS 9　61　(1)　151-+　2014

DOI： 10.1149/06101.0151ecst 　

ISSN： 1938-5862
Influence of Surface/Interface on the Performance of MIEC Cathode for SOFC Peer-reviewed

H. Sato, K. Yashiro, M. Sasaki, S. Hashimoto, T. Nakamura, K. Amezawa, T. Kawada

IONIC AND MIXED CONDUCTING CERAMICS 9　61　(1)　37-+　2014

DOI： 10.1149/06101.0037ecst 　

ISSN： 1938-5862
Thermodynamic analyses of structural phase transition of Pr2NiO4+delta involving variation of oxygen content Peer-reviewed

Eiki Niwa, Kazuya Wakai, Tetsuya Hori, Keiji Yashiro, Junichiro Mizusaki, Takuya Hashimoto

THERMOCHIMICA ACTA　575　129-134　2014/01

DOI： 10.1016/j.tca.2013.10.025 　

ISSN： 0040-6031

eISSN： 1872-762X
The crystal structure, oxygen nonstoichiometry and chemical stability of Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) Peer-reviewed

Fang Wang, Takashi Nakamura, Keiji Yashiro, Junichiro Mizusaki, Koji Amezawa

PHYSICAL CHEMISTRY CHEMICAL PHYSICS　16　(16)　7307-7314　2014

DOI： 10.1039/c3cp54810d 　

ISSN： 1463-9076

eISSN： 1463-9084
Ferroelastic Domain Reorientations and Its Influence on Mechanical Properties of La0.6Sr0.4Co0.2Fe0.8O3-delta Peer-reviewed

Yuta Kimura, Keiji Yashiro, Shin-ichi Hashimoto, Tatsuya Kawada

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　161　(11)　F3079-F3083　2014

DOI： 10.1149/2.0131411jes 　

ISSN： 0013-4651

eISSN： 1945-7111
Effect of Mechanical Stress on Oxygen Potential of Transition Metal Oxides Peer-reviewed

Yuki Gonoi, Yuta Kimura, Keiji Yashiro, Satoshi Watanabe, Shin-ichi Hashimoto, Tatsuya Kawada

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　161　(11)　F3111-F3116　2014

DOI： 10.1149/2.0181411jes 　

ISSN： 0013-4651

eISSN： 1945-7111
Effect of Mn-doping on stability of Scandia stabilized zirconia electrolyte under dual atmosphere of solid oxide fuel cells Peer-reviewed

Katsuhiko Yamaji, Haruo Kishimoto, Manuel E. Brito, Teruhisa Horita, Harumi Yokokawa, Megumi Shimazu, Keiji Yashiro, Tatsuya Kawada, Junichiro Mizusaki

SOLID STATE IONICS　247　102-107　2013/10

DOI： 10.1016/j.ssi.2013.05.019 　

ISSN： 0167-2738
Thermo-chemical lattice expansion in La0.6Sr0.4Co1-yFeyO3-delta Peer-reviewed

M. Kuhn, S. Hashimoto, K. Sato, K. Yashiro, J. Mizusaki

SOLID STATE IONICS　241　12-16　2013/06

DOI： 10.1016/j.ssi.2013.03.023 　

ISSN： 0167-2738
Reducing the chemical expansion coefficient in ceria by addition of zirconia Peer-reviewed

S. R. Bishop, D. Marrocchelli, W. Fang, K. Amezawa, K. Yashiro, G. W. Watson

ENERGY & ENVIRONMENTAL SCIENCE　6　(4)　1142-1146　2013/04

DOI： 10.1039/c3ee23917a 　

ISSN： 1754-5692
Oxygen Transport in Perovskite Type Oxide La0.6Sr0.4Co0.2Fe0.8O3-delta Peer-reviewed

Honami Kudo, Keiji Yashiro, Shin-ichi Hashimoto, Koji Amezawa, Tatsuya Kawada, Junichiro Mizusaki

HIGH TEMPERATURE CORROSION AND MATERIALS CHEMISTRY 10　50　(44)　37-42　2013

DOI： 10.1149/05044.0037ecst 　

ISSN： 1938-5862
Oxygen Nonstoichiometry and Thermo-Chemical Stability of Perovskite-Type La0.6Sr0.4Co1-yFeyO3-delta (y=0, 0.2, 0.4, 0.5, 0.6, 0.8, 1) Materials Peer-reviewed

M. Kuhn, Y. Fukuda, S. Hashimoto, K. Sato, K. Yashiro, J. Mizusaki

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　160　(1)　F34-F42　2013

DOI： 10.1149/2.050301jes 　

ISSN： 0013-4651
Oxygen nonstoichiometry and thermo-chemical stability of La 0.6Sr 0.4CoO 3-δ Peer-reviewed

M. Kuhn, S. Hashimoto, K. Sato, K. Yashiro, J. Mizusaki

Journal of Solid State Chemistry　197　38-45　2013/01

DOI： 10.1016/j.jssc.2012.08.001 　

ISSN： 0022-4596 1095-726X
Oxygen nonstoichiometry of Ce0.6La0.4O 2-δ Peer-reviewed

H. Sato, S. Hashimoto, T. Nakamura, K. Yashiro, K. Amezawa, T. Kawada

ECS Transactions　57　(1)　1125-1133　2013
Publisher: Electrochemical Society Inc.
DOI： 10.1149/05701.1125ecst 　

ISSN： 1938-6737 1938-5862
The effect of coexisting oxides upon carbon formation on Ni surface Peer-reviewed

Taiki Shindo, Satoshi Watanabe, Shin-Ich Hashimoto, Keiji Yashiro, Tatsuya Kawada, Takaaki Taniguchi, Takao Kudo, Yasushi Sato

ECS Transactions　57　(1)　1571-1576　2013
Publisher: Electrochemical Society Inc.
DOI： 10.1149/05701.1571ecst 　

ISSN： 1938-6737 1938-5862
Electrochemical performance and reaction mechanism of LaNi 0.6Fe0.4O3-δ - Ce0.9Gd 0.1O1.95 composite electrode for solid oxide fuel cell Peer-reviewed

R. A. Budiman, S. Hashimoto, K. Yashiro, K. Amezawa, T. Kawada

ECS Transactions　57　(1)　1873-1878　2013
Publisher: Electrochemical Society Inc.
DOI： 10.1149/05701.1873ecst 　

ISSN： 1938-6737 1938-5862
Oxygen Nonstoichiometry and Electrochemical Properties in a Thin Film of Nickel Substituted Lanthanum Cobaltite for SOFCs Peer-reviewed

Y. Uzumaki, S. Hashimoto, T. Nakamura, K. Yashiro, K. Amezawa, T. Kawada

SOLID OXIDE FUEL CELLS 13 (SOFC-XIII)　57　(1)　1893-1899　2013

DOI： 10.1149/05701.1893ecst 　

ISSN： 1938-5862
Direct Evaluation of Oxygen Chemical Potential Distribution in an SOFC Cathode by In Situ X-Ray Absorption Spectroscopy Peer-reviewed

Y. Fujimaki, H. Watanabe, Y. Terada, T. Nakamura, K. Yashiro, S. Hashimoto, T. Kawada, K. Amezawa

SOLID OXIDE FUEL CELLS 13 (SOFC-XIII)　57　(1)　1925-1932　2013

DOI： 10.1149/05701.1925ecst 　

ISSN： 1938-5862
Cathodic Reaction of Perovskite Oxide Electrodes on a Proton Conducting Electrolyte Peer-reviewed

K. Suzuki, S. Hashimoto, K. Yashiro, K. Amezawa, T. Kawada

SOLID OXIDE FUEL CELLS 13 (SOFC-XIII)　57　(1)　1985-1992　2013

DOI： 10.1149/05701.1985ecst 　

ISSN： 1938-5862
The Effect of Cation Substitution on Chemical Stability of Ba0.5Sr0.5Co0.8Fe0.2O3-delta-Based Mixed Conductors Peer-reviewed

F. Wang, T. Nakamura, K. Yashiro, J. Mizusaki, K. Amezawa

SOLID OXIDE FUEL CELLS 13 (SOFC-XIII)　57　(1)　2041-2049　2013

DOI： 10.1149/05701.2041ecst 　

ISSN： 1938-5862
Electronic Structures of LaCoO3-Based Oxides Studied by Soft X-ray Absorption Spectroscopy under Controlled Temperatures and Oxygen Partial Pressures Peer-reviewed

R. Oike, K. Amezawa, Y. Tamenori, K. Yashiro, T. Nakamura, T. Kawada

SOLID OXIDE FUEL CELLS 13 (SOFC-XIII)　57　(1)　2051-2056　2013

DOI： 10.1149/05701.2051ecst 　

ISSN： 1938-5862
SOFC低温作動化を目指したヘテロ界面電極の創製

八代圭司, 中村崇司, 水崎純一郎, 雨澤浩史, 井口史匡, 柴田佳和, 大沢洋平, 熊谷貴博, 湯上浩雄, 川田達也

第21回SOFC研究発表会予稿集　148-151　2012/12
SOFC構成材料の物理化学的・機械的特性とセル・スタックの信頼性

川田達也, 渡辺智, 坂本正, 尾澤伸樹, 佐藤一永, 橋田俊之, 宇根本篤, 八代圭司, 雨澤浩史, 水崎純一郎, 井口史匡, 橋本真一, 湯上浩雄, 寺田賢二郎

第21回SOFC研究発表会予稿集　28-34　2012/12
In situ analysis on the electrical conductivity degradation of NiO doped yttria stabilized zirconia electrolyte by micro-Raman spectroscopy Peer-reviewed

Haruo Kishimoto, Keiji Yashiro, Taro Shimonosono, Manuel E. Brito, Katsuhiko Yamaji, Teruhisa Horita, Harumi Yokokawa, Junichiro Mizusaki

ELECTROCHIMICA ACTA　82　(1)　263-267　2012/11

DOI： 10.1016/j.electacta.2012.04.148 　

ISSN： 0013-4686

eISSN： 1873-3859
CHEMICAL STABILITY OF Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ UNDER DIFFERENT OXYGEN PARTIAL PRESSURE Peer-reviewed

FANG WANG, KEIJI YASHIRO, KOJI AMEZAWA, JUNICHIRO MIZUSAKI

Proceedings of the 13th Asian Conference on Solid State Ionics　2012/07/17
EFFECTS OF A PHASE TRANSITION AND OXYGEN NONSTOICHIOMETRY ON ELASTIC MODULUS OF La_0.6Sr_0.4Co_1-yFe_yO_3-δ Peer-reviewed

YUTA KIMURA, TAKUTO KUSHI, TATSUYA KAWADA, SHIN-ICHI HASHIMOTO, KOJI AMEZAWA, KEIJI YASHIRO, JUNICHIRO MIZUSAKI

Proceedings of the 13th Asian Conference on Solid State Ionics　2012/07/17
SOFCの信頼性と構成材料の物理化学的・機械的特性 Peer-reviewed

川田達也, 渡辺智, 坂本正, 井口史匡, 佐藤一永, 橋本真一, 尾澤伸樹, 島崎智実, 寺田賢二郎, 八代圭司, 雨澤浩史, 橋田俊之, 久保百司, 湯上浩雄, 水崎純一郎

水素エネルギーシステム　37　(2)　101-106　2012/06/30
Phase transformation related conductivity degradation of NiO doped YSZ: An in-situ micro-Raman analysis Peer-reviewed

Haruo Kishimoto, Keiji Yashiro, Taro Shimonosono, Manuel E. Brito, Katsuhiko Yamaji, Teruhisa Horita, Harumi Yokokawa, Junichiro Mizusaki

Materials Research Society Symposium Proceedings　1385　7-12　2012

DOI： 10.1557/opl.2012.822 　

ISSN： 0272-9172
Mechanical properties of Ni-YSZ cermet anode under SOFC operating condition by using in-situ mechanical testing method Peer-reviewed

Satoshi Watanabe, Kazuhisa Sato, Shinji Sukinou, Fumitada Iguchi, Keiji Yashiro, Koji Amezawa, Hiroo Yugami, Toshiyuki Hashida, Junichiro Mizusaki, Tatsuya Kawada

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A　78　(787)　349-360　2012

DOI： 10.1299/kikaia.78.349 　

ISSN： 0387-5008
THE DESIGN AND DEVELOPMENT OF AN EVALUATION SYSTEM FOR REDOX CHARACTERISTICS OF ANODE SUPPORTED SOFCS USING IN-SITU ACOUSTIC EMISSION AND ELECTROCHEMICAL TECHNIQUE Peer-reviewed

S. Hashimoto, H. Watanabe, T. Sakamoto, T. Kawada, K. Yashiro, J. Mizusaki, K. Kumada, D. Changsheng, K. Sato, T. Hashida

PROCEEDINGS OF THE ASME 10TH FUEL CELL SCIENCE, ENGINEERING, AND TECHNOLOGY CONFERENCE, 2012　519-523　2012

DOI： 10.1115/FuelCell2012-91156 　
SOFCの機械的信頼性・耐久性向上に向けたその場観察手法開発

井口史匡, 佐藤一永, 島崎知実, 尾澤伸樹, 寺田賢二郎, 橋田俊之, 湯上浩雄, 八代圭司, 坂本正, 宇根本篤, 水崎純一郎, 橋本真一, 渡辺智, 雨澤浩史, 川田達也

第20回SOFC研究発表会予稿集　144-147　2011/12
Oxygen nonstoichiometry, thermo-chemical stability and lattice expansion of La0.6Sr0.4FeO3-delta Peer-reviewed

M. Kuhn, S. Hashimoto, K. Sato, K. Yashiro, J. Mizusaki

SOLID STATE IONICS　195　(1)　7-15　2011/07

DOI： 10.1016/j.ssi.2011.05.013 　

ISSN： 0167-2738
Electrical conductivity and chemical diffusion in Perovskite-type proton conductors in H-2-H2O gas mixtures Peer-reviewed

Keiji Yashiro, Satoshi Akoshima, Takao Kudo, Masatsugu Oishi, Hiroshige Matsumoto, Kazuhisa Sato, Tatsuya Kawada, Junichiro Mizusaki

SOLID STATE IONICS　192　(1)　76-82　2011/06

DOI： 10.1016/j.ssi.2010.03.011 　

ISSN： 0167-2738
Ionic Conductivity in Uniaxial Micro Strain/Stress Fields of Yttria-Stabilized Zirconia Peer-reviewed

Sato, Kazuhisa Suzuki, Ken Narumi, Ryo Yashiro, Keiji Hashida, Toshiyuki Mizusaki, Junichiro

Jpn. J. Appl. Phys.　50　(5 1)　055803-055803-5　2011/05
Publisher: The Japan Society of Applied Physics
DOI： 10.1143/JJAP.50.055803 　

ISSN： 0021-4922

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The influence of uniaxial compressive strain/stress on the O2- ion conductivity of an yttria-stabilized zirconia (YSZ) sample was investigated by using electrochemical measurement. The conductivity was investigated by the AC four-probe method and molecular dynamics simulation. The applied compressive strain/stress ranged from 0 to 0.0003 (stress: 1.5--55 MPa) for the specimen in air at 873, 973, and 1073 K. To clarify the reason for the phenomenon of the decline in conductivity, the relaxation time for the conductivity after the application of strain/stresses was measured. The experimental result revealed that as the applied compressive strain/stress increases, the carrier concentration remains steady, whereas the mobility decreases. The conductivity was decreased with increasing compressive strain, and this trend agreed with that of the simulation results. Therefore, the decrease in mobility was considered to be the reason for the decline in conductivity under compressive strain/stress conditions.
Thermal and chemical lattice expansibility of La0.6Sr0.4Co1-yFeyO3-delta (y=0.2, 0.4, 0.6 and 0.8) Peer-reviewed

Shin-ichi Hashimoto, Yasuhiro Fukuda, Melanie Kuhn, Kazuhisa Sato, Keiji Yashiro, Junichiro Mizusaki

SOLID STATE IONICS　186　(1)　37-43　2011/03

DOI： 10.1016/j.ssi.2011.01.014 　

ISSN： 0167-2738
Mechanical Properties of La0.6Sr0.4Co0.2Fe0.8O3-d under Various Temperatures and Oxygen Partial Pressures Peer-reviewed

Y. Kimura, T. Kushi, S. Hashimoto, S. Watanabe, K. Amezawa, T. Kawada, Y. Fukuda, A. Unemoto, K. Sato, K. Yashiro, J. Mizusaki, T. Hashida

Electrochemical Society Transactions,　35　(1)　2429-2934　2011
High-Temperature Protonic Conduction in LaFeO3-SrFeO3-delta-SrZrO3 Solid Solutions Peer-reviewed

Atsushi Unemoto, Atsushi Kaimai, Kazuhisa Sato, Naoto Kitamura, Keiji Yashiro, Hiroshige Matsumoto, Junichiro Mizusaki, Koji Amezawa, Tatsuya Kawada

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　158　(2)　B180-B188　2011

DOI： 10.1149/1.3518426 　

ISSN： 0013-4651
Mechanical properties evaluation method for non-stoichiometric materials under high temperature and oxidizing/reducing conditions Peer-reviewed

Satoshi Watanabe, Kazuhisa Sato, Yohei Takeyama, Fumitada Iguchi, Keiji Yashiro, Koji Amezawa, Hiroo Yugami, Toshiyuki Hashida, Junichiro Mizusaki, Tatsuya Kawada

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A　77　(780)　1357-1366　2011

DOI： 10.1299/kikaia.77.1357 　

ISSN： 0387-5008
Electrical Conductivity and Oxygen Diffusivity of Perovskite-type Solid Solution La0.6Sr0.4Co1-yFeyO3-delta (y=0, 0.2, 0.4, 0.5, 0.6, 0.8, 1.0) Peer-reviewed

Keiji Yashiro, Issei Nakano, Melanie Kuhn, Shinichi Hashimoto, Kazuhisa Sato, Junichiro Miuzusaki

SOLID OXIDE FUEL CELLS 12 (SOFC XII)　35　(1)　1899-1907　2011

DOI： 10.1149/1.3570179 　

ISSN： 1938-5862
In situ Observation of the Deformation and Mechanical Damage of SOFC Cell/Stack Peer-reviewed

K. Sato, T. Sakamoto, A. Kaimai, K. Yashiro, K. Amezawa, T. Hashida, J. Mizusaki, T. Kawada

SOLID OXIDE FUEL CELLS 12 (SOFC XII)　35　(1)　225-229　2011

DOI： 10.1149/1.3569997 　

ISSN： 1938-5862
y Mechanical Properties of La0.6Sr0.4Co1-yFeyO3-delta under Various Temperatures and Oxygen Partial Pressures Peer-reviewed

Y. Kimura, T. Kushi, S. Hashimoto, S. Watanabe, K. Amezawa, T. Kawada, Y. Fukuda, A. Unemoto, K. Sato, K. Yashiro, J. Mizusaki, T. Hashida

SOLID OXIDE FUEL CELLS 12 (SOFC XII)　35　(1)　2429-2434　2011

DOI： 10.1149/1.3570240 　

ISSN： 1938-5862
Multiscale Simulation of Electro-Chemo-Mechanical Coupling Behavior of PEN Structure under SOFC Operation Peer-reviewed

K. Terada, T. Kawada, K. Sato, F. Iguchi, K. Yashiro, K. Amezawa, M. Kubo, H. Yugami, T. Hashida, J. Mizusaki, H. Watanabe, T. Sasagawa, H. Aoyagi

SOLID OXIDE FUEL CELLS 12 (SOFC XII)　35　(1)　923-933　2011

DOI： 10.1149/1.3570073 　

ISSN： 1938-5862
Oxygen Nonstoichiometry of Perovskite-type La0.6Sr0.4Co1-yFeyO3-delta (y=0, 0.2, 0.4, 0.5, 0.6, 0.8, 1) SOFC Cathode Materials Peer-reviewed

M. Kuhn, Y. Fukuda, S. Hashimoto, K. Sato, K. Yashiro, J. Mizusaki

SOLID OXIDE FUEL CELLS 12 (SOFC XII)　35　(1)　1881-1890　2011

DOI： 10.1149/1.3570177 　

ISSN： 1938-5862
Oxygen nonstoichiometry and thermo-chemical stability of La0.6Sr0.4Co1-yFeyO3-delta (y=0.2, 0.4, 0.6, 0.8) Peer-reviewed

Shin-ichi Hashimoto, Yasuhiro Fukuda, Melanie Kuhn, Kazuhisa Sato, Keiji Yashiro, Junichiro Mizusaki

SOLID STATE IONICS　181　(37-38)　1713-1719　2010/12

DOI： 10.1016/j.ssi.2010.09.024 　

ISSN： 0167-2738
Nondestructive depth-resolved chemical state analysis of (La,Sr) MnO3 film under high temperature Peer-reviewed

Kozo Shinoda, Shigeru Suzuki, Keiji Yashiro, Junichiro Mizusaki, Tomoya Uruga, Hajime Tanida, Hidenori Toyokawa, Yasuko Terada, Masafumi Takagaki

SURFACE AND INTERFACE ANALYSIS　42　(10-11)　1650-1654　2010/10

DOI： 10.1002/sia.3584 　

ISSN： 0142-2421
Fracture process of nonstoichiometric oxide based solid oxide fuel cell under oxidizing/reducing gradient conditions Peer-reviewed

Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Hiroo Yugami, Toshiyuki Hashida, Junichiro Mizusaki

JOURNAL OF POWER SOURCES　195　(17)　5481-5486　2010/09

DOI： 10.1016/j.jpowsour.2010.03.077 　

ISSN： 0378-7753
Defect structure analysis of proton-oxide ion mixed conductor BaCe0.9Nd0.1O3-delta Peer-reviewed

Masatsugu Oishi, Satoshi Akoshima, Keiji Yashiro, Kazuhisa Sato, Tatsuya Kawada, Junichiro Mizusaki

SOLID STATE IONICS　181　(29-30)　1336-1343　2010/09

DOI： 10.1016/j.ssi.2010.07.034 　

ISSN： 0167-2738
Electrical conductivity, Seebeck coefficient, and defect structure of oxygen nonstoichiometric Nd_2-xSr_xNiO_4+δ Peer-reviewed

Nakamura, T., Yashiro, K., Sato, K., Mizusaki, J.

Materials Chemistry and Physics　122　(1)　250-258　2010/07/01

DOI： 10.1016/j.matchemphys.2010.02.044 　

ISSN： 0254-0584
Electrical conduction and mass transport properties of SrZr0.99Fe0.01O3 (-) (delta) Peer-reviewed

Atsushi Unemoto, Atsushi Kaimai, Kazuhisa Sato, Naoto Kitamura, Keiji Yashiro, Hiroshige Matsumoto, Junichiro Mizusaki, Koji Amezawa, Tatsuya Kawada

SOLID STATE IONICS　181　(19-20)　868-873　2010/07

DOI： 10.1016/j.ssi.2010.05.002 　

ISSN： 0167-2738
Structural analysis of La2-xSrxNiO4 (+) (delta) by high temperature X-ray diffraction Peer-reviewed

Takashi Nakamura, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki

SOLID STATE IONICS　181　(5-7)　292-299　2010/03

DOI： 10.1016/j.ssi.2010.01.007 　

ISSN： 0167-2738

eISSN： 1872-7689
Thermally-induced and chemically-induced structural changes in layered perovskite-type oxides Nd2-xSrxNiO4+delta (x=0, 0.2, 0.4) Peer-reviewed

Takashi Nakamura, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki

SOLID STATE IONICS　181　(8-10)　402-411　2010/03

DOI： 10.1016/j.ssi.2010.02.002 　

ISSN： 0167-2738
Reaction kinetics on platinum electrode/yttrium-doped barium cerate interface under H-2-H2O atmosphere Peer-reviewed

Satoshi Akoshima, Masatsugu Oishi, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki

SOLID STATE IONICS　181　(3-4)　240-248　2010/02

DOI： 10.1016/j.ssi.2009.05.003 　

ISSN： 0167-2738
Oxygen nonstoichiometry, thermo-chemical stability and crystal structure of La0.6Sr0.4CoO3-δ and La 0.6Sr0.4FeO3-δ

M. Kuhn, K. Sato, K. Yashiro, J. Mizusaki, Shin-Ichi Hashimoto

Materials Science and Technology Conference and Exhibition 2010, MS and T'10　1　206-213　2010
Development of in-situ mechanical testing method for SOFC components Peer-reviewed

Satoshi Watanabe, Kazuhisa Sato, Yohei Takeyama, Fumitada Iguchi, Keiji Yashiro, Toshiyuki Hashida, Junichiro Mizusaki, Tatsuya Kawada

ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology, FUELCELL 2010　2　417-420　2010

DOI： 10.1115/FuelCell2010-33294 　
固体酸化物燃料電池の材料データベース構築とプロセス統合設計支援システムの試作 Peer-reviewed

高藤淳, 佐藤一永, 八代圭司, 來村徳信, 水崎純一郎, 溝口理一郎

設計工学・システム部門講演会講演論文集　2009　(19)　58-63　2009/10/28
Publisher: The Japan Society of Mechanical Engineers
ISSN： 1348-0286

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Solid Oxide Fuel Cell, which has high efficiency of electric power generation, is one of the key technologies for us to reach to the low carbon society. Over 30 years' basic research of SOFC leads it just to launch to practical use in the real world, whereas the accumulation of huge amount of research data, especially material data, urges to be restructured as well-organized knowledge to interoperably share and reuse for both enterprise and research institute. Therefore we establish such knowledge management infrastructure that enables designers to design SOFC system from the viewpoint of comprehensiveness; furthermore, we develop practical software tools to realize the infrastructure. Our approach mainly consists of three phases. The first phase is to build SOFC material database using MatML (Materials Markup Language) which is an XML (eXtensible Markup Language) designed for materials property data. The second phase is to externalize functional knowledge of devices as the form of function decompositions tree according to each process in product life cycle of SOFC by means of functional modeling technique based on ontology engineering. Finally those trees are integrated and visualized in 3D virtual space. We discuss a methodology of cross-process design support for SOFC systems, and introduce our prototype system based on the methodology.
Defect chemical and statistical thermodynamic studies on oxygen nonstoichiometric Nd2-xSrxNiO4+delta Peer-reviewed

Takashi Nakamura, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki

SOLID STATE IONICS　180　(26-27)　1406-1413　2009/10

DOI： 10.1016/j.ssi.2009.08.008 　

ISSN： 0167-2738
Electrical Conductivity and Thermoelectric Power of La_2-xSr_xNiO_4+delta Peer-reviewed

Takashi Nakamura, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki

ECS Transactions, 214th ECS Meeting, Solid State Ionic Devices 6 - Nanoionics　16　(51)　317-325　2009/09

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6139
High-Temperature Gravimetric Study on the Kinetics of the Formation of SrTiO₃ by Solid State Reaction of SrCO₃ and TiO₂ Peer-reviewed

Eiki Niwa, Kazuhisa Sato, Keiji Yashiro, Junichiro Mizusaki

ECS Transactions, 214th ECS Meeting, High Temperature Corrosion and Materials Chemistry 7　16　(44)　205-210　2009/08

DOI： 10.1149/1.3224758 　

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6134
Effect of Y2O3 addition on the conductivity and elastic modulus of (CeO2)(1-x)(YO1.5)(x) Peer-reviewed

Kazuhisa Sato, Ken Suzuki, Keiji Yashiro, Tatsuya Kawada, Hiroo Yugami, Toshiyuki Hashida, Alan Atkinson, Junichiro Mizusaki

SOLID STATE IONICS　180　(20-22)　1220-1225　2009/08

DOI： 10.1016/j.ssi.2009.06.003 　

ISSN： 0167-2738

eISSN： 1872-7689
Oxygen nonstoichiometry and chemical stability of Nd2-xSrxNiO4+delta Peer-reviewed

Takashi Nakamura, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki

JOURNAL OF SOLID STATE CHEMISTRY　182　(6)　1533-1537　2009/06

DOI： 10.1016/j.jssc.2009.03.021 　

ISSN： 0022-4596
Thermodynamic quantities and defect equilibrium in La2-xSrxNiO4+delta Peer-reviewed

Takashi Nakamura, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki

JOURNAL OF SOLID STATE CHEMISTRY　182　(5)　1121-1128　2009/05

DOI： 10.1016/j.jssc.2009.02.008 　

ISSN： 0022-4596
Oxygen nonstoichiometry and defect equilibrium in La2-xSrxNiO4+delta Peer-reviewed

Takashi Nakamura, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki

SOLID STATE IONICS　180　(4-5)　368-376　2009/04

DOI： 10.1016/j.ssi.2009.01.013 　

ISSN： 0167-2738
Defect structure analysis of B-site doped perovskite-type proton conducting oxide BaCeO3 Part 1: The defect concentration of BaCe0.9M0.1O3-delta (M = Y and Yb) Peer-reviewed

Masatsugu Oishi, Satoshi Akoshima, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki, Tatsuya Kawada

SOLID STATE IONICS　180　(2-3)　127-131　2009/03

DOI： 10.1016/j.ssi.2008.12.025 　

ISSN： 0167-2738
Chemically-induced stress of fuel cell laminate under oxidizing/reducing gradient condition

Kazuhisa Sato, Keiji Yashiro, Toshiyuki Hashida, Junichiro Mizusaki

ICCM International Conferences on Composite Materials　2009
Publisher: International Committee on Composite Materials
S0305-3-3 Relationship between Nonstoichiometry and Physical Properties of Components for Solid Oxide Fuel Cells

Nakamura Takashi, Takeyama Yohei, Fukuda Yasuhiro, Nakayama Shota, Yashiro Keiji, Hashida Toshiyuki, Mizusaki Junichiro

The proceedings of the JSME annual meeting　2009　237-238　2009
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2009.1.0_237 　

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In this study, Crystal structure and mechanical properties of K_2NiF_4 type oxides were measured by high temperature X-ray diffractometry and in-situ small punch test as a function of oxygen partial pressure, P(O_2) and temperature. Chemically induced volume change was evaluated by nonstoichiometric data and the variation of the lattice constants with P(O_2). The elastic modulus and the fracture strength become larger at higher P(O_2) condition. This may be caused by the structural change due to the variation of oxygen content.
Classification of mechanical failures of SOFC and strategy for evaluation of the operational margins Peer-reviewed

T. Kawada, S. Watanabe, S. Hashimoto, T. Sakamoto, A. Unemoto, M. Kurumatani, K. Sato, F. Iguchi, K. Yashiro, K. Amezawa, K. Terada, M. Kubo, H. Yugami, T. Hashida, J. Mizusaki

ECS Transactions　25　(2)　467-472　2009

DOI： 10.1149/1.3205556 　

ISSN： 1938-5862 1938-6737
Reaction kinetics on platinum electrode / yttrium-doped barium cerate interface under H₂-H₂O atmosphere Peer-reviewed

Satoshi Akoshima, Masatsugu Oishi, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki

Solid State Ionics　2009

DOI： 10.1016/j.ssi.2009.05.003 　

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5583
Surface reaction and transport kinetics of hydrogen through palladium-based membranes under gas co-existing with hydrogen atmospheres Peer-reviewed

Atsushi Unemoto, Nobuyuki Hirai, Atsushi Kaimai, Kazuhisa Sato, Takanori Otake, Keiji Yashiro, Junichiro Mizusaki, Tatsuya Kawada, Tatsuya Tsuneki, Yoshinori Shirasaki, Yoshu Ota, Isamu Yasuda

International Journal of Nuclear Hydrogen Production and Applications　2　(1)　55-68　2009

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5413
Oxygen nonstoichiometry and chemical stability of Nd_2－xSr_xNiO_4+δ Peer-reviewed

Takashi Nakamura, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki

Journal of Solid State Chemistry　182　(6)　1533-1537　2009

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5471
Design Concept for the High Temperature Photoelectronic Devices Using SrTiO3 Peer-reviewed

Fumimasa Horikiri, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Junichiro Mizusaki

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　156　(7)　P107-P113　2009

DOI： 10.1149/1.3129244 　

ISSN： 0013-4651
Electronic state of oxygen nonstoichiometric La2-xSrxNiO4+delta at high temperatures Peer-reviewed

Takashi Nakamura, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki

PHYSICAL CHEMISTRY CHEMICAL PHYSICS　11　(17)　3055-3062　2009

DOI： 10.1039/b823364k 　

ISSN： 1463-9076
High-Temperature Defect and Crystal Structure of Perovskite Type Oxide Ion Conductor La0.8Sr0.2Ga0.8Mg0.15Co0.05O3-delta Peer-reviewed

S. Nakayama, S. Hashimoto, K. Sato, K. Yashiro, K. Amezawa, J. Mizusaki

SOLID OXIDE FUEL CELLS 11 (SOFC-XI)　25　(2)　1701-1708　2009

DOI： 10.1149/1.3205708 　

ISSN： 1938-5862
High Temperature Defect Equilibrium, Solid State Properties and Crystal Structure of La0.6Sr0.4Co1-yFeyO3-delta (y=0.2, 0.4, 0.6, 0.8) for Cathode of Solid Oxide Fuel Cells Peer-reviewed

Yasuhiro Fukuda, Shinichi Hashimoto, Kazuhisa Sato, Keiji Yashiro, Junichiro Mizusaki

SOLID OXIDE FUEL CELLS 11 (SOFC-XI)　25　(2)　2375-2380　2009

DOI： 10.1149/1.3205790 　

ISSN： 1938-5862
Oxygen Nonstoichiometry, Crystal Structure and Mechanical Properties of La2NiO4+delta Peer-reviewed

T. Nakamura, Y. Takeyama, S. Watanabe, K. Yashiro, K. Sato, T. Hashida, J. Mizusaki

SOLID OXIDE FUEL CELLS 11 (SOFC-XI)　25　(2)　2573-2580　2009

DOI： 10.1149/1.3205814 　

ISSN： 1938-5862
Conductivities and Seebeck Coefficients of Donor-doped SrTiO3 Oxide Ceramics Peer-reviewed

E. Niwa, K. Sato, K. Yashiro, J. Mizusaki

SOLID OXIDE FUEL CELLS 11 (SOFC-XI)　25　(2)　2631-2638　2009

DOI： 10.1149/1.3205821 　

ISSN： 1938-5862
Composite Cathode of Perovskite-Related Oxides, (La,Sr)CoO3-delta/(La,Sr)(2)CoO4-delta, for Solid Oxide Fuel Cells Peer-reviewed

Keiji Yashiro, Takashi Nakamura, Maya Sase, Florian Hermes, Kazuhisa Sato, Tatsuya Kawada, Junichiro Mizusaki

ELECTROCHEMICAL AND SOLID STATE LETTERS　12　(9)　B135-B137　2009

DOI： 10.1149/1.3170903 　

ISSN： 1099-0062
深さ分解XPSおよびXASによる酸化物薄膜表面領域の化学状態分析

柳瀬宏貴, 篠田弘造, 八代圭司, 水崎純一郎, 鈴木茂

東北大学多元物質科学研究所素材工学研究彙報　64　(1,2)　37-44　2008/12
Publisher:
ISSN： 1348-4052
Defect structure analysis of B-site doped perovskite-type proton conducting oxide BaCeO3 Part 2: The electrical conductivity and diffusion coefficient of BaCe0.9Y0.1O3-delta Peer-reviewed

Masatsugu Oishi, Satoshi Akoshima, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki, Tatsuya Kawada

SOLID STATE IONICS　179　(39)　2240-2247　2008/12

DOI： 10.1016/j.ssi.2008.08.005 　

ISSN： 0167-2738
Defect equilibrium and electron transport in the bulk of single crystal SrTi1-xNbxO3 (x=0.01, 0.001, 0.0002) Peer-reviewed

Fumimasa Horikiri, Naofumi Iizawa, LiQun Han, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Junichiro Mizusaki

SOLID STATE IONICS　179　(40)　2335-2344　2008/12

DOI： 10.1016/j.ssi.2008.10.001 　

ISSN： 0167-2738
Oxygen nonstoichiometry and defect structure analysis of B-site mixed perovskite-type oxide (La, Sr)(Cr, M)O3-delta (M = Ti, Mn and Fe) Peer-reviewed

Masatsugu Oishi, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki, Tatsuya Kawada

JOURNAL OF SOLID STATE CHEMISTRY　181　(11)　3177-3184　2008/11

DOI： 10.1016/j.jssc.2008.08.015 　

ISSN： 0022-4596
High-Temperature Gravimetric Study on the Kinetics of the Formation of SrTiO₃ by Solid State Reaction of SrCO₃ and TiO₂ Peer-reviewed

Eiki Niwa, Kazuhisa Sato, Keiji Yashiro, Junichiro Mizusaki

ECS Transactions　16　(44)　pp. 205-210　2008/10/12

DOI： 10.1149/1.3224758 　
FABRICATION OF YTTRIA-STABILIZED ZIRCONA THIN UNDER ROOM TEMPERATURE AND ATMOSPHERIC PRESSURE CONDITIONS Peer-reviewed

Tatsuya Sone, Kazuhisa Sato, Keiji Yashiro, Kazuhiro Ogawa, Tatuya Kawada, Tsunemoto Kuriyagawa, Toshiyuki Hashida, Junichiro Mizusaki

Proceedings of the 3rd JSME/ASME International Conference on Material and Processing ICM&P 2008　2008/10/07
Slow relaxation kinetics of Sr(Zr,Y)O-3 in wet atmosphere Peer-reviewed

Takao Kudo, Keiji Yashiro, Hiroshige Matsumoto, Kazuhisa Sato, Tatsuya Kawada, Junichiro Mizusaki

SOLID STATE IONICS　179　(21-26)　851-854　2008/09

DOI： 10.1016/j.ssi.2008.02.011 　

ISSN： 0167-2738
Oxygen nonstoichiometry of the perovskite-type oxides BaCe0.9M0.1O3-delta (M=Y, Yb, Sm, Tb, and Nd) Peer-reviewed

Masatsugu Oishi, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki, Naoto Kitamura, Koji Amezawa, Tatsuya Kawada, Yoshiharu Uchimoto

SOLID STATE IONICS　179　(15-16)　529-535　2008/06

DOI： 10.1016/j.ssi.2008.03.038 　

ISSN： 0167-2738
Enhancement of oxygen exchange at the hetero interface of (La,Sr)CoO3/(La,Sr)(2)CoO4 in composite ceramics Peer-reviewed

Maya Sase, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki, Tatsuya Kawada, Natsuko Sakai, Katsuhiko Yamaji, Tenihisa Horita, Harumi Yokokawa

SOLID STATE IONICS　178　(35-36)　1843-1852　2008/02

DOI： 10.1016/j.ssi.2007.11.039 　

ISSN： 0167-2738
1242 Fabrication and Evaluation of Functional Oxide Thin Film by using Powder Jet Deposition Method

SATO Kazuhisa, SONE Tatsuya, YASHIRO Keiji, OGAWA Kazuhiro, KAWADA Tatsuya, KURIYAGAWA Tsunemoto, HASHIDA Toshiyuki, MIZUSAKI Junichiro

The proceedings of the JSME annual meeting　2008　329-330　2008
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2008.6.0_329 　

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Powder Jet Deposition (PJD) method is one of the film forming technique& Ceramics films can be fabricated by this method Ytariastabilized zirconia (YSZ) thin films were deposited on various substrates by PJD method YSZ thin film was fabricated in systemically changed substrates, particle sizes and carrier gas pressures. The microstructures of YSZ films were observed by scanning electron microscope (SEM). From this study results, the amount of deposition rate by PJD method varies according to substrate hardness and powder size. Similarly, the film structures are affected by substrate and powder size. Additionally, the electrical conductivity of YSZ film on Al_2O_3 substrate was measured as a function of temperature using impedance and two-probe A.C. method From this measurement, the amount of this film's electrical conductivity is good agreement from other studies of YSZ bulks. This result shows probability of application to high temperature ceramics devices such as Solid Oxide Fuel Cells (SOFCs), gas sensors.
Electrical properties of Nb-doped SrTiO3 ceramics with excess TiO2 for SOFC anodes and interconnects Peer-reviewed

Fumimasa Horikiri, LiQun Han, Naofumi Iizawa, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Junichiro Mizusaki

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　155　(1)　B16-B20　2008

DOI： 10.1149/1.2799733 　

ISSN： 0013-4651
Determination of the Reaction Zone in Gadolinia-Doped Ceria Anode for Solid Oxide Fuel Cell Peer-reviewed

Takashi Nakamura, Keiji Yashiro, Atsushi Kaimai, Takanori Otake, Kazuhisa Sato, Tatsuya Kawada, Junichiro Mizusaki

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　155　(12)　B1244-B1250　2008

DOI： 10.1149/1.2975322 　

ISSN： 0013-4651
Electrochemical behaviors of mixed conducting oxide anodes for solid oxide fuel cell Peer-reviewed

Takashi Nakamura, Tsuneyuki Kobayashi, Keiji Yashiro, Atsushi Kaimai, Takanori Otake, Kazuhisa Sato, Junichiro Mizusaki, Tatsuya Kawada

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　155　(6)　B563-B569　2008

DOI： 10.1149/1.2901047 　

ISSN： 0013-4651
Enhancement of oxygen surface exchange at the hetero-interface of (La,Sr)CoO(3)/(La,Sr)(2)CoO(4) with PLD-Layered films Peer-reviewed

M. Sase, F. Hermes, K. Yashiro, K. Sato, J. Mizusaki, T. Kawada, N. Sakai, H. Yokokawa

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　155　(8)　B793-B797　2008

DOI： 10.1149/1.2928612 　

ISSN： 0013-4651
Effect of Chemically-induced Expansion on Damage of Solid Oxide Fuel Cell Peer-reviewed

佐藤一永, 八代圭司, 橋田俊之, 川田達也, 湯上浩雄, 水崎純一郎

日本機械学会論文集　74　(737)　68-74　2008/01
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.74.68 　

ISSN： 0387-5008

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The influence of chemically-induced expansion on the fracture damage of a ceria based solid oxide fuel cell (SOFC) was investigated by using numerical stress analyses. The single cell examined in this study was composed of electrolyte [(CeO₂) _0.8 (SmO_1.5) _0.2], anode (Cermets of NiO-20 SDC), and cathode (La_0.6Sr_0.4Co_0.2Fe_0.8O₃), respectively. The finite element method was employed to calculate the residual stress, thermal stresses, and chemically-induced expansion stresses for the single cell. The residual and thermal stresses were calculated much smaller than the fracture strength of the individual components of the single cell. On the other hand, the chemically-induced expansion stresses were shown to remarkably increase for the temperature range greater than 973 K and accounted their magnitude for the primary part of the induced stress. It was shown from the stress analysis that the maximum stress induced in the single cell exceeded the fracture strength of the individual components at the onset of the fracture damage detect by acoustic emission method. The above-mentioned calculation results suggest that the chemically-induced expansion should be taken into account for the use of ceria based ceramics materials in SOFCs.
Hydrogen permeability and electrical properties in oxide composites Peer-reviewed

Atsushi Unemoto, Atsushi Kaimai, Kazuhisa Sato, Keiji Yashiro, Hiroshige Matsumoto, Junichiro Mizusaki, Koji Amezawa, Tatsuya Kawada

SOLID STATE IONICS　178　(31-32)　1663-1667　2008/01

DOI： 10.1016/j.ssi.2007.11.001 　

ISSN： 0167-2738
Electrical conductivity and thermoelectric power of La2-xSr xNiO4+δ Peer-reviewed

Takashi Nakamura, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki

ECS Transactions　16　(51)　317-325　2008

DOI： 10.1149/1.3242246 　

ISSN： 1938-5862 1938-6737
Oxygen nonstoichiometry and defect equilibrium in La2-xSr xNiO4+δ Peer-reviewed

Takashi Nakamura, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki

ECS Transactions　16　(44)　193-198　2008

DOI： 10.1149/1.3224756 　

ISSN： 1938-5862 1938-6737
Conductivity variation of yttria-stabilized zirconia under stress Peer-reviewed

T. Izumi, R. Narumi, K. Sato, K. Suzuki, K. Yashiro, T. Hashida, J. Mizusaki

ECS Transactions　16　(51)　125-132　2008

DOI： 10.1149/1.3242227 　

ISSN： 1938-5862 1938-6737
Carbon deposition and electrochemical reaction of anode for SOFC in methane containing atmosphere Peer-reviewed

Keiji Yashiro, Mitsunari Takase, Kazuhisa Sato, Tatsuya Kawada, Junichiro Mizusaki

ECS Transactions　16　(51)　213-218　2008

DOI： 10.1149/1.3242236 　

ISSN： 1938-5862 1938-6737
Electronic properties and oxygen nonstoichiometry of mixed-conducting oxide La1-xSrxCoO3-δ thin films at high temperature Peer-reviewed

D. Hemmi, K. Iwamoto, N. Hirai, M. Sase, A. Unemoto, T. Nakamura, F. Horikiri, Y. Mori, K. Sato, K. Yashiro, T. Kawada, J. Mizusaki

ECS Transactions　16　(51)　311-316　2008

DOI： 10.1149/1.3242245 　

ISSN： 1938-5862 1938-6737
The barrier formation mechanism on SrTiO3 for high-temperature photo-electronic devices Peer-reviewed

F. Horikiri, T. Ichikawa, K. Sato, K. Yashiro, T. Kawada, J. Mizusaki

ECS Transactions　16　(51)　451-458　2008

DOI： 10.1149/1.3242261 　

ISSN： 1938-5862 1938-6737
The design concept for high-temperature photo-electronic devices using SrTiO3 Peer-reviewed

F. Horikiri, K. Sato, K. Yashiro, T. Kawada, J. Mizusaki

ECS Transactions　16　(51)　459-469　2008

DOI： 10.1149/1.3242262 　

ISSN： 1938-5862 1938-6737
Surface reaction of hydrogen on a palladium alloy membrane under co-existence of H2O, CO, CO2 or CH4 Peer-reviewed

Atsushi Unemoto, Atsushi Kaimai, Kazuhisa Sato, Takanori Otake, Keiji Yashiro, Junichiro Mizusaki, Tatsuya Kawada, Tatsuya Tsuneki, Yoshinori Shirasaki, Isamu Yasuda

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　32　(16)　4023-4029　2007/11

DOI： 10.1016/j.ijhydene.2007.04.030 　

ISSN： 0360-3199
The effect of co-existing gases from the process of steam reforming reaction on hydrogen permeability of palladium alloy membrane at high temperatures Peer-reviewed

Atsushi Unemoto, Atsushi Kaimai, Kazuhisa Sato, Takanori Otake, Keiji Yashiro, Junichiro Mizusaki, Tatsuya Kawada, Tatsuya Tsuneki, Yoshinori Shirasaki, Isamu Yasuda

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　32　(14)　2881-2887　2007/09

DOI： 10.1016/j.ijhydene.2007.03.037 　

ISSN： 0360-3199
Oxygen nonstoichiometry of B-site doped LaCrO3 Peer-reviewed

Masatsugu Oishi, Keiji Yashiro, Jeong-Oh Hong, Yutaka Nigara, Tatsuya Kawada, Junichiro Mizusaki

SOLID STATE IONICS　178　(3-4)　307-312　2007/02

DOI： 10.1016/j.ssi.2006.12.018 　

ISSN： 0167-2738
ELECTROCHEMICAL CHARACTARIZATION AND IDENTIFICATION OF REACTION SITES IN OXIDE ANODES Peer-reviewed

Nakamura T, Yashiro K, Kaimai A, Otake T, Sato K, Park G. J, Kawada T, Mizusaki J

ADVANCES IN SOLID OXIDE FUEL CELLS II　27　(4)　193-198　2007

ISSN： 0196-6219
Effects of Co-existing Gas with Hydrogen on Surface Reaction Rate of Palladium-Silver Membranes for Hydrogen Separation Peer-reviewed

Atsushi UNEMOTO, Atsushi KAIMAI, Kazuhisa SATO, Takanori OTAKE, Keiji YASHIRO, Junichiro MIZUSAKI, Tatsuya KAWADA, Tatsuya TSUNEKI, Yoshinori SHIRASAKI, Yoshu OTA, Isamu YASUDA

水素エネルギーシステム　32　(2)　34-39　2007
Publisher:
ISSN： 1341-6995
Promotion of Oxygen Surface Reaction at the Hetero-Interface of (La,Sr)CoO3/(La,Sr)(2)CoO4 Peer-reviewed

M. Sase, F. Hermes, T. Nakamura, K. Yashiro, K. Sato, J. Mizusaki, T. Kawada, N. Sakai, K. Yamaji, T. Horita, H. Yokokawa

SOLID OXIDE FUEL CELLS 10 (SOFC-X), PTS 1 AND 2　7　(1)　1055-1060　2007

DOI： 10.1149/1.2729202 　

ISSN： 1938-5862
Electrode Performance at Hetero-interface of Perovskite-related Oxides, (La, Sr)CoO3-delta/(La, Sr)(2)CoO4-delta Peer-reviewed

K. Yashiro, T. Nakamura, M. Sase, F. Hermes, K. Sato, T. Kawada, J. Mizusaki

SOLID OXIDE FUEL CELLS 10 (SOFC-X), PTS 1 AND 2　7　(1)　1287-1292　2007

DOI： 10.1149/1.2729230 　

ISSN： 1938-5862
Microstructural Changes of Ni/YSZ Cermet under Repeated Redox Reaction in Environmental Scanning Electron Microscope (ESEM) Peer-reviewed

Y. Nakagawa, K. Yashiro, K. Sato, T. Kawada, J. Mizusaki

SOLID OXIDE FUEL CELLS 10 (SOFC-X), PTS 1 AND 2　7　(1)　1373-+　2007

DOI： 10.1149/1.2729241 　

ISSN： 1938-5862
Electrochemical Behaviors of Mixed Conducting Oxide Anode for SOFC Peer-reviewed

Takashi Nakamura, Tsuneyuki Kobayasi, Keiji Yashiro, Kazuhisa Sato, Tatsuya Kawada, Junichiro Mizusaki

SOLID OXIDE FUEL CELLS 10 (SOFC-X), PTS 1 AND 2　7　(1)　1601-1607　2007

DOI： 10.1149/1.2729267 　

ISSN： 1938-5862
Electrical Properties of Nb-Doped SrTiO3 Ceramics with Excess TiO2 for Anodes and Interconnects of SOFCs Peer-reviewed

Fumimasa Horikiri, Li Qun Han, Naofumi Iizawa, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Junichiro Mizusaki

SOLID OXIDE FUEL CELLS 10 (SOFC-X), PTS 1 AND 2　7　(1)　1639-1644　2007

DOI： 10.1149/1.2729272 　

ISSN： 1938-5862
Reliability Evaluation of SOFC under Simulated Operating Condition Peer-reviewed

K. Sato, N. Imanaka, K. Fukui, M. Numao, S. Kyotani, K. Yashiro, T. Kawada, T. Hashida, J. Mizusaki

SOLID OXIDE FUEL CELLS 10 (SOFC-X), PTS 1 AND 2　7　(1)　455-+　2007

DOI： 10.1149/1.2729123 　

ISSN： 1938-5862
A concept of chemical potential pumping effect of nonstoichiometric oxides and the NOx sensing mechanism of the perovskite-type La0.5Sr0.5FeO3 Peer-reviewed

Junichiro Mizusaki, Hiroyuki Ohama, Keiji Yashiro, Tatsuya Kawada

ELECTROCHEMISTRY　74　(12)　949-955　2006/12

DOI： 10.5796/electrochemistry.74.949 　

ISSN： 1344-3542
Experimental Approach to the Dynamic Behaviors of High Temperature Electrodes Peer-reviewed

T.Kawada, M.Sase, H.Hosoi, K.Yashiro, K.Sato, J.Mizusaki, N.Sakai, T.Horita, K.Yamaji, H.Yokokawa, M.Rai, K.Kitamura, K.Amezawa, Y.Uchimoto

Electrochemistry and Thermodynamics on Materials Processing for Sustainable Production: Masko Symposium　633-636　2006/11/12
Effect of Mechanical Load on the Electrical Property of Yttria-Stabilized Zirconia Peer-reviewed

Kazuhisa.Sato, R.Narumi, K.Yashiro, T.Kawada, H.Yugami, T.Hashida, J.Mizusaki

Electrochemistry and Thermodynamics on Materials Processing for Sustainable Production: Masko Symposium　823-827　2006/11/12
Evaluation of Surface Reaction of Hydrogen on a Palladium-silver Membrane under Co-existence of H₂O, CO, CO₂ or CH₄ Peer-reviewed

A.Unemoto, N.Hirai, A.Kaimai, K.Sato, T.Otake, K.Yashiro, J.Mizusaki, T.Kawada, T.Tsuneki, Y.Shirasaki, I.Yasuda

Electrochemistry and Thermodynamics on Materials Processing for Sustainable Production: Masko Symposium　839-842　2006/11/12
A New Method for Evaluating Degradation of Solid Oxide Fuel Cell under Operating Conditions by Combining the Electrochemical Measuement with Non-Destructive Test

Kazuhisa.sato, Shintaro.Kyotani, Toshiyuki.Hashida, Hirokazu.Moriya, Tatsuya.Kawada, Keiji.Yashiro, Takashi.Nakamura, Hiroo.Yugami, Junichiro.Mizusaki

Proceedings of Asian Symposium on Materials and Processing 2006　2006　132-132　2006/11/08
Publisher: The Japan Society of Mechanical Engineers

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The purpose of present research is to estimate the degradation mechanism of solid oxide fuel cell (SOFC) by using combining non-destructive test and electrochemical measurement during loading test Mechanical degradation and chemically degradation were investigated by acoustic emission (AE) measurement system and electrochemical measurement,respectively. In the investigation of fracture process with AE amplitude distributions, high amplitude signal, middle amplitude signal and low amplitude signal correspond to vertical craking, delamination in the cathode, and vertical cracking in the elctrolyte respectively. It was demonstrated that the AE method enabled us to detect the above-mentioned mechanical damage and to determine the condition for the onset of the damage in the single cell.
The Performance of SrTiO₃ Schottky Cell at High-Temperatures and it's Relationship to Substrate Orientation

F. Horikiri, K. Sato, K. Yashiro, T. Kawada, J. Mizusaki

Third International Conference on Flow Dynamics　113-114　2006/11/07
The Oxygen Nonstoichiometry of doped BaCeO₃ perovskite-type Oxides

M.Oishi, K.Sato, K.Yashiro, T.Kawada, J.Mizusaki

Third International Conference on Flow Dynamics　151-152　2006/11/07
Microscopic observation of oxygen reaction pathway on high temperature electrode materials Peer-reviewed

Tatsuya Kawada, Maya Sase, Masakazu Kudo, Keiji Yashiro, Kazuhisa Sato, Junichiro Mizusaki, Natsuko Sakai, Teruhisa Horita, Katsuhiko Yamaji, Harumi Yokokawa

SOLID STATE IONICS　177　(35-36)　3081-3086　2006/11

DOI： 10.1016/j.ssi.2006.08.005 　

ISSN： 0167-2738
Emission characteristics of F- ions into vacuum from CaF2 Peer-reviewed

Takaaki Sakai, Atsushi Kaimai, Takanori Otake, Keiji Yashiro, Tatsuya Kawada, Junichiro Mizusaki, Masateru Nishioka

SOLID STATE IONICS　177　(19-25)　1601-1605　2006/10

DOI： 10.1016/j.ssi.2006.05.014 　

ISSN： 0167-2738

eISSN： 1872-7689
Nonstoichiometry of the perovskite-type solid solution La0.9Ca0.1Cr1-yAlyO3-delta Peer-reviewed

Junichiro Mizusaki, Mamoru Hasegawa, Keiji Yashiro, Hiroshige Matsumoto, Tatsuya Kawada

SOLID STATE IONICS　177　(19-25)　1925-1928　2006/10

DOI： 10.1016/j.ssi.2006.06.001 　

ISSN： 0167-2738
Electrode reaction and microstructure of La0.6Sr0.4CoO3-delta thin films Peer-reviewed

Maya Sase, Junji Suzuki, Keiji Yashiro, Takanori Otake, Atsushi Kaimai, Tatsuya Kawada, Junichiro Mizusaki, Hiroo Yugami

SOLID STATE IONICS　177　(19-25)　1961-1964　2006/10

DOI： 10.1016/j.ssi.2006.01.018 　

ISSN： 0167-2738
The influence of grain boundary on the conductivity of donor doped SrTiO3 Peer-reviewed

Fumimasa Horikiri, Li Qun Han, Atsushi Kaimai, Takanori Otake, Keiji Yashiro, Tatsuya Kawada, Junichiro Mizusaki

SOLID STATE IONICS　177　(26-32)　2555-2559　2006/10

DOI： 10.1016/j.ssi.2006.03.023 　

ISSN： 0167-2738
Continuous emission of O- ions into a vacuum from a bare surface of yttria-stabilized zirconia at elevated temperatures Peer-reviewed

Yukio Fujiwara, Takaaki Sakai, Atsushi Kaimai, Keiji Yashiro, Tatsuya Kawada, Junichiro Mizusaki

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A　24　(5)　1818-1822　2006/09

DOI： 10.1116/1.2232541 　

ISSN： 0734-2101
Electrode Performance and Reaction Sites of Mixed Conducting Oxide Anode

T.Nakamura, K.Yashiro, A.Kaimai, T.Otake, K.Sato, G.J.Park, T.Kawada, J. Mizusaki

7th European Solid Oxide Fuell Cell Forum　2006/07/03
Electrical Conductivity and Defect Structure of Perovskite Oxide La0.9Ca0.1(Cr, Al)O3 Peer-reviewed

Keiji Yashiro, Mamoru Hasegawa, Eiki Niwa, Kazuhisa Sato, Atsushi Kaimai, Takanori Otake, Tatsuya Kawada, Junichiro MIzusaki

7th European Solid Oxide Fuell Cell Forum (CD-ROM)　P809　2006/07/03
Fast¹⁸O Incorporation Paths along the Hetero Phase Boundary with (La, Sr)₂CoO₄

M.Sase, F.Hermes, K.Yashiro, T.Otake, A.Kaimai, T.Kawada, J.Mizusaki, N.Sakai, K.Yamaji, H.Yokokawa

Proceedings of the 7th Euro Solid Oxide Fuel Cell Forum　B0666　2006/07/03
Hydrogen Permeability of Palladium Alloy Membrane at High Temperatures in the Impurity Gases Co-existing Atmospheres

A.Unemoto, A.Kaimai, T.Otake, K.Yashiro, T.Kawada, J.Mizusaki, T.Tsuneki, I.Yasuda

16th World Hydrogen Energy Conference　2006/06/13
Tracking the onset of damage mechanism in ceria-based solid oxide fuel cells under simulated operating conditions Peer-reviewed

K Sato, H Omura, T Hashida, K Yashiro, H Yugami, T Kawada, J Mizusaki

JOURNAL OF TESTING AND EVALUATION　34　(3)　246-250　2006/05

ISSN： 0090-3973
Charactaristics of Damage and Fracture Process of Solid Oxide Fuel Cells UnderSimulated Operating Conditions by Using AE Method Peer-reviewed

K.Sato, T.Hashida, H.Yugami, K.Yashiro, T.Kawada, J.Mizusaki

The Japanese Society for NDI,Progress in Acoustic Emission XIII　269-276　2006/04
Hydrogen separation using proton-conducting perovskites Peer-reviewed

H Matsumoto, T Shimura, H Iwahara, T Higuchi, K Yashiro, A Kaimai, T Kawada, J Mizusaki

JOURNAL OF ALLOYS AND COMPOUNDS　408　456-462　2006/02

DOI： 10.1016/j.jallcom.2004.12.093 　

ISSN： 0925-8388
Emission characteristics of negative oxygen ions into vacuum from cerium oxide Peer-reviewed

T Sakai, Y Fujiwara, A Kaimai, K Yashiro, H Matsumoto, Y Nigara, T Kawada, J Mizusaki

JOURNAL OF ALLOYS AND COMPOUNDS　408　1127-1131　2006/02

DOI： 10.1016/j.jallcom.2004.12.125 　

ISSN： 0925-8388
改質ガスからの水素分離におけるパラジウム系合金の表面反応速度の評価

宇根本篤, 開米篤志, 佐藤一永, 大竹隆憲, 八代圭司, 川田達也, 水崎純一郎, 常木達也, 白崎義則, 安田勇

化学工学会研究発表講演要旨集　2006　748-748　2006
Publisher: 公益社団法人化学工学会
DOI： 10.11491/scej.2006f.0.748.0 　
Electronic structure of proton conducting BaCe0.90Y0.10O3-delta Peer-reviewed

T Higuchi, T Tsukamoto, H Matsumoto, T Shimura, K Yashiro, Kawada, I, J Mizusaki, S Shin, T Hattori

SOLID STATE IONICS　176　(39-40)　2967-2970　2005/12

DOI： 10.1016/j.ssi.2005.09.032 　

ISSN： 0167-2738

eISSN： 1872-7689
Evaluation of fracture behavior of (CeO 2) 1-x(SmO 1.5) x based solid oxide fuel cell laminates Peer-reviewed

Kazuhisa Sato, Toshiyuki Hashida, Keiji Yashiro, Hiroo Yugami, Tatsuya Kawada, Junichiro Mizusaki

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy　52　(11)　836-839　2005/11

DOI： 10.2497/jjspm.52.836 　

ISSN： 0532-8799
Nb-doped SrTiO3-based high-temperature Schottky solar cells Peer-reviewed

F Horikiri, T Ichikawa, LQ Han, A Kaimai, K Yashiro, H Matsumoto, T Kawada, J Mizusaki

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　44　(11)　8023-8026　2005/11

DOI： 10.1143/JJAP.44.8023 　

ISSN： 0021-4922
Application of FT-IR for in situ investigation of high temperature electrode reactions Peer-reviewed

T Murai, K Yashiro, A Kaimai, T Otake, H Matsumoto, T Kawada, J Mizusaki

SOLID STATE IONICS　176　(31-34)　2399-2403　2005/10

DOI： 10.1016/j.ssi.2005.06.029 　

ISSN： 0167-2738

eISSN： 1872-7689
Electronic structure of protonic conductor SrZr0.90M0.10O3 (M=Y3+, Sc3+) probed by soft-X-ray spectroscopy Peer-reviewed

T Higuchi, T Tsukamoto, H Matsumoto, T Shimura, K Yashiro, T Kawada, J Mizusaki, S Shin, T Hattori

SOLID STATE IONICS　176　(31-34)　2435-2438　2005/10

DOI： 10.1016/j.ssi.2005.06.030 　

ISSN： 0167-2738

eISSN： 1872-7689
Catalytic chemical potential shift on the surface of nonstoichiometric oxides under non-equilibrium gas atmosphere Peer-reviewed

K Yashiro, S Onuma, M Sase, A Kaimai, T Otake, H Matsumoto, T Kawada, J Mizusaki

SOLID STATE IONICS　176　(31-34)　2411-2416　2005/10

DOI： 10.1016/j.ssi.2005.06.027 　

ISSN： 0167-2738
Oxygen Reduction Kinectics on Oxide Electrodes Invited

Tatsuya Kawada, Maya Sase, Keiji Yashiro, Takanori Otake, Atsushi Kaimai, Junichiro Mizusaki

Solid State Electrochemistry, Proceedings of 26th Risoe International Symposiumon Materials Science, S. Linderoth et al. (Eds.)　2005/09/04
Mechanical damage evaluation of solid oxide fuel cells under simulated operating conditions Peer-reviewed

K Sato, T Hashida, K Yashiro, H Yugami, T Kawada, J Mizusaki

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN　113　(1320)　562-564　2005/08

DOI： 10.2109/jcersj.113.562 　

ISSN： 1882-0743

eISSN： 1348-6535
Electrochemical performance of oxide anode materials and catalytic effect of current collector Peer-reviewed

Keiji Yashiro, Takashi Nakamura, Atsushi Kaimai, Takanori Otake, Tatsuya Kawada, Junichiro Mizusaki

Solid Oxide Fuel Cells (SOFC IV ), ed S.C. Singhal and J. Mizusaki, Electrochemical Soc. Proc. Vol. 2005-07,　Jul-05　1369-1375　2005/05/15
Resistance of (La, Sr)CoO3 / YSZ interface with a ceria interlayer Peer-reviewed

T. Kawada, D. Ueno, K. Yashiro, T. Otake, A. Kaimai, J. Mizusaki

Solid Oxide Fuel Cells (SOFC IV ), ed S.C. Singhal and J. Mizusaki, Electrochemical Soc. Proc. Vol. 2005-07,　Jul-05　1695-1702　2005/05/15
Fracture Behavior of Ceria-based Solid Oxide Fuel Cells under Simulated Reducing Atmosphere Peer-reviewed

Kazuhisa Sato, Keiji Yashiro, Hajime Omura, Toshiyuki Hashida, Junichiro Mizusaki

Proceedings of the 16th Symposium on Functionally Graded Materials (FGM2004)　144-149　2005/03
Interfacial reaction and electrochemical properties of dense (La,Sr) CoO3-delta cathode on YSZ(100) Peer-reviewed

M Sase, D Ueno, K Yashiro, A Kaimai, T Kawada, J Mizusaki

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS　66　(2-4)　343-348　2005/02

DOI： 10.1016/j.jpcs.2004.06.057 　

ISSN： 0022-3697
Protonic-electronic mixed conduction and hydrogen permeation in BaCe0.9-xY0.1RuxO3-alpha Peer-reviewed

H Matsumoto, T Shimura, O Higuchi, H Tanaka, K Katahira, T Otake, T Kudo, K Yashiro, A Kaimai, T Kawada, J Mizusaki

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　152　(3)　A488-A492　2005

DOI： 10.1149/1.1852442 　

ISSN： 0013-4651

eISSN： 1945-7111
Mixed protonic-electronic conduction properties of SrZr0.9-xY0.1RuxO3-alpha Peer-reviewed

H Matsumoto, T Shimura, T Higuchi, T Otake, Y Sasaki, K Yashiro, A Kaimai, T Kawada, J Mizusaki

ELECTROCHEMISTRY　72　(12)　861-864　2004/12

ISSN： 1344-3542
Chemical stability of La1-xSrxCrO3 in oxidizing atmospheres Peer-reviewed

S Miyoshi, S Onuma, A Kaimai, H Matsumoto, K Yashiro, T Kawada, J Mizusaki, H Yokokawa

JOURNAL OF SOLID STATE CHEMISTRY　177　(11)　4112-4118　2004/11

DOI： 10.1016/j.jssc.2004.04.054 　

ISSN： 0022-4596
Electrical properties and defect structure of niobia-doped ceria Peer-reviewed

K Yashiro, Suzuki, I, A Kaimai, H Matsumoto, Y Nigara, T Kawada, J Mizusaki, J Sfeir, J Van Herle

SOLID STATE IONICS　175　(1-4)　341-344　2004/11

DOI： 10.1016/j.ssi.2004.01.066 　

ISSN： 0167-2738
In situ XRD study on oxygen-excess LaMnO3 Peer-reviewed

S Miyoshi, A Kaimai, H Matsumoto, K Yashiro, Y Nigara, T Kawada, J Mizusaki

SOLID STATE IONICS　175　(1-4)　383-386　2004/11

DOI： 10.1016/j.ssi.2004.01.082 　

ISSN： 0167-2738
Electrical properties of the surface layer formed on the Nb-doped SrTiO3 single crystal at low temperatures Peer-reviewed

LQ Han, A Kaimai, K Yashiro, Y Nigara, T Kawada, J Mizusaki, PP Chen, CJ Zhong, T Higuchi

SOLID STATE IONICS　175　(1-4)　431-435　2004/11

DOI： 10.1016/j.ssi.2004.03.046 　

ISSN： 0167-2738
Hydrogen isotope sensor using high temperature proton conductors Peer-reviewed

H Matsumoto, H Hayashi, T Shimura, K Amezawa, T Otake, K Yashiro, Y Nigara, A Kaimai, T Kawada, H Iwahara, J Mizusaki

SOLID STATE IONICS　175　(1-4)　491-495　2004/11

DOI： 10.1016/j.ssi.2004.01.068 　

ISSN： 0167-2738
DEFECT STRUCTURE AND OXYGEN DIFFUSIVITY OF DONOR DOPED CERIA Peer-reviewed

Keiji Yashiro, Takeo Suzuki, Mamoru Hasegawa, Atsushi Kaimai, Hiroshige Matsumoto, Tatsuya Kawada, Junichiro Mizusaki, Teruhisa Horita, Harumi Yokokawa

Electrochemical Society Proceedings　PV2004　(25)　210-217　2004/10/03
Oxygen nonstoichiometry of the perovskite-type oxide la(1-x)Ca(x)CrO(3-delta) (x=0.1, 0.2, 0.3) Peer-reviewed

S Onuma, K Yashiro, S Miyoshi, A Kaimai, H Matsumoto, Y Nigara, T Kawada, J Mizusaki, K Kawamura, N Sakai, H Yokokawa

SOLID STATE IONICS　174　(1-4)　287-293　2004/10

DOI： 10.1016/j.ssi.2004.07.037 　

ISSN： 0167-2738

eISSN： 1872-7689
Electronic structure in the band-gap region of protonic conductor SrZr0.90Y0.10O3-delta Peer-reviewed

T Higuchi, H Matsumoto, T Shimura, K Yashiro, T Kawada, J Mizusaki, S Shin, T Tsukamoto

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　43　(8A)　5419-5420　2004/08

DOI： 10.1143/JJAP.43.5419 　

ISSN： 0021-4922
High temperature Schottky barrier on n-type SrTiO3 and its sensitivity to ambient gases Peer-reviewed

T Kawada, T Ichikawa, LQ Han, K Yashiro, H Matsumoto, J Mizusaki

JOURNAL OF ELECTROCERAMICS　13　(1-3)　715-719　2004/07

DOI： 10.1007/s10832-004-5181-0 　

ISSN： 1385-3449
Microscopic observations of SOFC qnodes under operation with hydrocarbon fuel Peer-reviewed

Tatsuya Kawada, Keiji Yashiro, Tomoaki Taura, Kenichiro Takeda, Atsushi Kaimai, Hiroshige Matsumoto, Juichiro Mizusaki, Hiroo Yugami

Fuel Cell Science, Engineering and Technology-2004　53-59　2004/06/14
Electronic structure of protonic conductor BaCe0.90Y0.10O3-delta probed by soft-X-ray spectroscopy Peer-reviewed

T Higuchi, H Matsumoto, T Shimura, K Yashiro, T Kawada, J Mizusaki, S Shin, T Tsukamoto

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　43　(6A)　L731-L734　2004/06

DOI： 10.1143/JJAP.43.L731 　

ISSN： 0021-4922
Hydrogen permeability of YSZ single crystals at high temperatures Peer-reviewed

Y Nigara, K Yashiro, JO Hong, T Kawada, J Mizusaki

SOLID STATE IONICS　171　(1-2)　61-67　2004/06

DOI： 10.1016/S0167-2738(03)00274-1 　

ISSN： 0167-2738
In situ Fourier Transform Infrared Spectroscopy of Oxygen Species on Pt/YSZ Electrodes at High Temperature Peer-reviewed

T. Murai, K. Yashiro, A. Kaimai, H. Matsumoto, Y. Nigara, T. Kawada, J. Mizusaki

Transactions of the Materials Research Society of Japan　29　(8)　3439-3442　2004/04
Tunneling Current Through the Surface Layer Formed on The Nb-doped SrTiO3 Single Crystal Peer-reviewed

L. Q. Han, P. P. Chen, C. J. Zhong, T. Higuchi, A. Kaimai, K. Yashiro, Y. Nigara, T. Kawada, J. Mizusaki

Solid State Ionics 175　431-435　2004
Mixed protonic-electronic conduction in transition-metal-doped perovskite-type oxides Peer-reviewed

H Matsumoto, T Otake, T Kudo, Y Sasaki, K Yashiro, A Kaimai, T Kawada, J Mizusaki, T Shimura, T Higuchi, K Katahira

SOLID STATE IONICS: THE SCIENCE AND TECHNOLOGY OF IONS IN MOTION　213-220　2004
Hydrogen separation from reformed gases using high-temperature proton conductors Peer-reviewed

H Matsumoto, Kudo, I, T Otake, F Horikiri, A Kaimai, K Yashiro, T Kawada, J Mizusaki, T Shimura, H Iwahara, M Watanabe

SOLID STATE IONICS: THE SCIENCE AND TECHNOLOGY OF IONS IN MOTION　373-380　2004
Effect of electrochemical polarization on the emission of O- ions from the surface of YSZ Peer-reviewed

Y Fujiwara, T Sakai, A Kaimai, K Yashiro, Y Nigara, T Kawada, J Mizusaki

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　150　(11)　E543-E547　2003/11

DOI： 10.1149/1.1611495 　

ISSN： 0013-4651
Lattice expansion upon reduction of perovskite-type LaMnO3 with oxygen-deficit nonstoichiometry Peer-reviewed

S Miyoshi, JO Hong, K Yashiro, A Kaimai, Y Nigara, K Kawamura, T Kawada, J Mizusaki

SOLID STATE IONICS　161　(3-4)　209-217　2003/08

DOI： 10.1016/S0167-2738(03)00281-9 　

ISSN： 0167-2738
Nonstoichiometry of Ce1-xYxO2-0.5x-delta (X=0.1, 0.2) Peer-reviewed

T Otake, H Yugami, K Yashiro, Y Nigara, T Kawada, J Mizusaki

SOLID STATE IONICS　161　(1-2)　181-186　2003/07

DOI： 10.1016/S0167-2738(02)00873-1 　

ISSN： 0167-2738
A CONCEPT OF CHEMICAL POTENTIAL PUMPING EFFECT AND THE Nox SENSING MECHANISM OF PEROVSKITE-TYPE OXIDE MIXED CONDUCTORS Peer-reviewed

Junichiro Mizusaki, K. Yashiro, T. Kawada, H. Ohama

Solid-State Ionic Devices III　236-251　2003/04
Effect of Nonstoichiometry on the Volume of LaMnO3+d Based Perovskite Oxides Peer-reviewed

Shogo Miyoshi, J.-O. Hong, K. Yashiro, A. Kaimai, Y. Nigara, T. Kawada, J. Mizusaki, K. Kawamura

Solid-State Ionic Devices III　372-282　2003/04
Hydrogen permeability in (CeO2)(0.9)(GdO1.5)(0.1) at high temperatures Peer-reviewed

Y Nigara, K Yashiro, Kawada, I, J Mizusaki

SOLID STATE IONICS　159　(1-2)　135-141　2003/03

DOI： 10.1016/S0167-2738(02)00919-0 　

ISSN： 0167-2738
An oxygen negative ion source of a new concept using solid oxide electrolytes Peer-reviewed

Y Fujiwara, A Kaimai, JO Hong, K Yashiro, Y Nigara, T Kawada, J Mizusaki

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　150　(2)　E117-E124　2003/02

DOI： 10.1149/1.1536995 　

ISSN： 0013-4651
Electrical properties of the surface layer formed on the Nb-doped SrTiO3 single crystal Peer-reviewed

LQ Han, N Iizawa, Y Chiba, T Yoneta, A Kaimai, K Yashiro, H Yugami, Y Nigara, T Kawada, J Mizusaki

CERAMIC INTERFACES: PROPERTIES AND APPLICATIONS V　253　29-41　2003

ISSN： 1013-9826
Phase stability of La1-xCaxCrO3-delta in oxidizing atmosphere Peer-reviewed

S Onuma, S Miyoshi, K Yashiro, A Kaimai, K Kawamura, Y Nigara, T Kawada, J Mizusaki, N Sakai, H Yokokawa

JOURNAL OF SOLID STATE CHEMISTRY　170　(1)　68-74　2003/01

DOI： 10.1016/S0022-4596(02)00024-5 　

ISSN： 0022-4596
Situ observation of deposited carbon on anode for solid oxide fuel cells Peer-reviewed

K Yashiro, K Takeda, T Taura, T Otake, A Kaimai, Y Nigara, T Kawada, J Mizusaki

SOLID OXIDE FUEL CELLS VIII (SOFC VIII)　2003　(7)　714-719　2003
Lattice creation and annihilation of LaMnO3+delta caused by nonstoichiometry change Peer-reviewed

S Miyoshi, JO Hong, K Yashiro, A Kaimai, Y Nigara, K Kawamura, T Kawada, J Mizusaki, J Mizusaki

SOLID STATE IONICS　154　(B SI)　257-263　2002/12

DOI： 10.1016/S0167-2738(02)00441-1 　

ISSN： 0167-2738
Mass transport properties of Ce0.9Gd0.1O2-delta at the surface and in the bulk Peer-reviewed

K Yashiro, S Onuma, A Kaimai, Y Nigara, T Kawada, J Mizusaki, K Kawamura, T Horita, H Yokokawa

SOLID STATE IONICS　152　(A SI)　469-476　2002/12

DOI： 10.1016/S0167-2738(02)00375-2 　

ISSN： 0167-2738
Demonstration and stack concept of quick startup/shutdown SOFC (qSOFC) Peer-reviewed

K Yashiro, N Yamada, T Kawada, JO Hong, A Kaimai, Y Nigara, J Mizusaki

ELECTROCHEMISTRY　70　(12)　958-960　2002/12

ISSN： 1344-3542
Determination of oxygen vacancy concentration in a thin film of La0.6Sr0.4CoO3-delta by an electrochemical method Peer-reviewed

T Kawada, J Suzuki, M Sase, A Kaimai, K Yashiro, Y Nigara, J Mizusaki, K Kawamura, H Yugami

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　149　(7)　E252-E259　2002/07

DOI： 10.1149/1.1479728 　

ISSN： 0013-4651
Emission characteristics of O- ions from a bare surface of yttria-stabilized zirconia (YSZ) at elevated temperatures Peer-reviewed

Y Fujiwara, A Kaimai, JO Hong, K Yashiro, Y Nigara, T Kawada, J Mizusaki

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS　41　(6A)　L657-L659　2002/06

DOI： 10.1143/JJAP.41.L657 　

ISSN： 0021-4922
Electric-Field Effect on the Surface Process of Platinum-Coated Yttria-Stabilized Zirconia Peer-reviewed

Yukio Fujiwara, Atsushi Kaimai, Jeong-Oh Hong, Keiji Yashiro, Yutaka Nigara, Tatsuya Kawada, Junichiro Mizusaki

Transactions of the Materials Research Society of Japan　27　(1)　85-88　2002/04
Impurity cation diffusion in perovskite-type oxide, YCrO3 Peer-reviewed

JO Hong, S Miyoshi, A Kaimai, K Yashiro, Y Nigara, Kawada, I, J Mizusaki

IONIC AND MIXED CONDUCTING CERAMICS IV　2001　(28)　49-57　2002
Lithium activities in lithium transition metal double oxide Peer-reviewed

Kawamura K, Asano K, Nagano S, Kaimai A, Yashiro K, Nigara Y, Kawada T, Mizusaki J

IONIC AND MIXED CONDUCTING CERAMICS IV　2001　(28)　272-279　2002
Defect equilibrium and transport properties of nb doped SrTiO3 Peer-reviewed

Kawada T, Iizawa N, Han LQ, Yashiro K, Kaimai A, Nigara Y, Mizusaki J

IONIC AND MIXED CONDUCTING CERAMICS IV　2001　(28)　296-305　2002
A concept and an experimental study on O- ion source using solid oxide electrolytes Peer-reviewed

Y Fujiwara, A Kaimai, JO Hong, K Yashiro, Y Nigara, T Kawada, J Mizusaki

HIGH TEMPERATURE MATERIALS, PROCEEDINGS　2002　(5)　185-199　2002
The atomic hydrogen permeability in (CeO2)(0.85)(CaO)(0.15) at high temperatures Peer-reviewed

Y Nigara, K Yashiro, T Kawada, J Mizusaki

SOLID STATE IONICS　145　(1-4)　365-370　2001/12

DOI： 10.1016/S0167-2738(01)00932-8 　

ISSN： 0167-2738
Electrical Conductivity and Water-Methanol Uptake of Proton Conducting NafionR117 Membrane Peer-reviewed

K. Miura, J.-O. Hong, K. Yashiro, Y. Nigara, T. Kawada, J. Mizusaki

Transactions of the Materials Research Society of Japan　26　1079-1082　2001/04
Surface reaction kinetics of oxygen on La1-xSrxCoO3-delta cathode Peer-reviewed

T Kawada, M Sase, J Suzuki, K Masuda, K Yashiro, A Kaimai, Y Nigara, J Mizusaki, K Kawamura, H Yugami

SOLID OXIDE FUEL CELLS VII (SOFC VII)　2001　(16)　529-538　2001
Electrochemical properties of oxide anode materials for SOFC Peer-reviewed

K Yashiro, T Kobayashi, LQ Han, A Kaimai, Y Nigara, T Kawada, J Mizusaki, K Kawamura

SOLID OXIDE FUEL CELLS VII (SOFC VII)　2001　(16)　678-683　2001
Electrochemical oxidation of CO in a CO-CO2 system at the interface of Ni grid electrode/YSZ electrolyte Peer-reviewed

FZ Boulenouar, K Yashiro, M Oishi, A Kaimai, Y Nigara, T Kawada, J Mizusaki

SOLID OXIDE FUEL CELLS VII (SOFC VII)　2001　(16)　759-768　2001
Non-equilibrium gas sensing mechanism in perovskite-type oxide La0.5Sr0.5CoO3-delta Peer-reviewed

Yashiro K, Onuma S, Kaimai A, Kawamura K, Nigara Y, Kawada T, Mizusaki J

HIGH TEMPERATURE CORROSION AND MATERIALS CHEMISTRY　99　(38)　525-533　2000
CO sensing mechanism with chemical potential shifting on Au/YSZ interface Peer-reviewed

Keiji Yashiro, Masakazu Kudo, Hiroki Matsumoto, Atsushi Kaimai, Yutaka Nigara, Tatsuya Kawada, Junichiro Mizusaki, Kenichi Kawamura

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy　47　(9)　1026-1031　2000
Publisher: Funtai Funmatsu Yakin Kyokai
DOI： 10.2497/jjspm.47.1026 　

ISSN： 0532-8799

Show all ︎Show first 5

Misc. 47

Potential Profile Analysis of Ionic Conductors Using General Circuit Simulator Invited Peer-reviewed

Keiji YASHIRO, Soichiro EBATA, Tatsuya KAWADA

Denki Kagaku　92　(4)　336-340　2024/12/05
Publisher: The Electrochemical Society of Japan
DOI： 10.5796/denkikagaku.24-te0402 　

ISSN： 2433-3255

eISSN： 2433-3263
Degradation Mechanism and Ni Migration in Anode of Solid Oxide Cells Invited Peer-reviewed

Riyan Achmad BUDIMAN, Xiaolin SHAO, Tatsuya KAWADA, Keiji YASHIRO

Journal of the Hydrogen Energy Systems Society of Japan　49　(1)　6-14　2024/03
Evaluation of Reaction Mechanism on SOFC Cathodes by Using Patterned Thin Film Model Electrodes

雨澤浩史, 今泉貴明, 水野敬太, 木村勇太, 中村崇司, 新田清文, 関澤央輝, 井口史匡, 湯上浩雄, 八代圭司, 川田達也

固体イオニクス討論会講演要旨集　46th (CD-ROM)　2020
パターンモデル電極によるPCFC空気極La_0.6Sr_0.4CoO_3-δにおける電極反応機構の解析

西舘克弥, 四宮由貴, 水野敬太, 木村勇太, 中村崇司, 八代圭司, 川田達也, 見神祐一, 尾沼重徳, 黒羽智宏, 谷口昇, 辻庸一郎, 雨澤浩史

電気化学会大会講演要旨集(CD-ROM)　86th　2019
緻密膜パターン電極によるLa_0.6Sr_0.4CoO_3-δ/Gd_0.1Ce_0.9O_3-δコンポジット空気極の反応機構の解明

今泉貴明, 水野敬太, 中村崇司, 木村勇太, 新田清文, 関澤央輝, 井口史匡, 湯上浩雄, 八代圭司, 川田達也, 雨澤浩史

電気化学会大会講演要旨集(CD-ROM)　86th　2019
La_0.6Sr_0.4CoO_3-δ/Gd_0.1Ce_0.9O_1.95積層パターン緻密膜電極を用いたSOFCコンポジット空気極の反応機構の解明

今泉貴明, 水野敬太, 木村勇太, 中村崇司, 新田清文, 関澤央輝, 井口史匡, 湯上浩雄, 八代圭司, 川田達也, 雨澤浩史

固体イオニクス討論会講演要旨集　45th　2019
Oxygen Reduction Reaction in High Temperature Fuel Cells Invited

YASHIRO Keiji, KAWADA Tatsuya

60　(6)　345-351　2018/12
パターン緻密膜電極を用いたランタンコバルタイトPCFC空気極における反応サイト評価

雨澤浩史, 四宮由貴, 水野敬太, 西舘克弥, 木村勇太, 中村崇司, 八代圭司, 川田達也, 見神祐一, 尾沼重徳, 黒羽智宏, 谷口昇, 辻庸一郎

電気化学秋季大会講演要旨集(CD-ROM)　2018　2018
パターン緻密膜電極を用いたランタンストロンチウムコバルタイトPCFC空気極の反応サイト評価

西舘克弥, 四宮由貴, 水野敬太, 木村勇太, 中村崇司, 八代圭司, 川田達也, 見神祐一, 尾沼重徳, 黒羽智宏, 谷口昇, 辻庸一郎, 雨澤浩史

固体イオニクス討論会講演要旨集　44th　2018
SOFC混合導電性空気極の電極反応に及ぼす水蒸気の影響

水野敬太, 藤巻義信, 中村崇司, 木村勇太, 関澤央輝, 新田清文, 井口史匡, 八代圭司, 湯上浩雄, 川田達也, 雨澤浩史

固体イオニクス討論会講演要旨集　44th　2018
Multiscale simulation of LSCF with evolving ferroelastic phase

22　6p　2017/05
Publisher: 日本計算工学会
Development of transient electrochemo-mechanical analysis system for solid oxide fuel cell

22　5p　2017/05
Publisher: 日本計算工学会
SOFC空気極反応に及ぼす三相界面反応の寄与

藤巻義信, 水野敬太, 木村勇太, 中村崇司, 新田清文, 寺田靖子, 八代圭司, 川田達也, 井口史匡, 湯上浩雄, 雨澤浩史

電気化学会大会講演要旨集(CD-ROM)　84th　2017
パターン緻密膜モデル電極を用いた混合導電性SOFC空気極における反応経路評価

雨澤浩史, 水野敬太, 藤巻義信, 木村勇太, 中村崇司, 新田清文, 寺田靖子, 井口史匡, 八代圭司, 湯上浩雄, 川田達也

電気化学秋季大会講演要旨集(CD-ROM)　2017　2017
SOFC空気極反応における三相界面反応の影響の評価

水野敬太, 藤巻義信, 中村崇司, 木村勇太, 新田清文, 関澤央輝, 寺田靖子, 井口史匡, 八代圭司, 湯上浩雄, 川田達也, 雨澤浩史

電気化学会東北支部セミコンファレンス講演論文集　48th　2017
SOFC混合導電性空気極の電極反応に対する三相界面反応の寄与

水野敬太, 藤巻義信, 中村崇司, 木村勇太, 新田清文, 寺田靖子, 井口史匡, 八代圭司, 湯上浩雄, 川田達也, 雨澤浩史

固体イオニクス討論会講演要旨集　43rd　2017
Analysis system of transient Electrochemo-Mechanical simulation of solid oxide fuel cell implemented in commercial fem software

Masami Sato, Mayu Muramatsu, Kenjiro Terada, Satoshi Watanabe, Keiji Yashiro, Tatsuya Kawada, Harumi Yokokawa

Transactions of the Japan Society for Computational Engineering and Science　2017　2017/01/01

DOI： 10.11421/jsces.2017.20170004 　

eISSN： 1347-8826
多孔体電極を模擬した緻密膜パターン電極を用いたSOFC空気極反応の解析

雨澤浩史, 藤巻義信, 進藤勇佑, 水野敬太, 木村勇太, 中村崇司, 新田清文, 寺田靖子, 井口史匡, 湯上浩雄, 八代圭司, 川田達也

固体イオニクス討論会講演要旨集　42nd　2016
SOFC混合導電性空気極の電気化学的反応における三相界面反応の影響

水野敬太, 藤巻義信, 木村勇太, 中村崇司, 新田清文, 寺田靖子, 井口史匡, 湯上浩雄, 八代圭司, 川田達也, 雨澤浩史

固体イオニクス討論会講演要旨集　42nd　2016
Electrochemical Analysis Based on Reaction-diffusion Equations of Oxygen Ion and Electron Considering Phase Transformation in Zirconia

20　6p　2015/06
Publisher: 日本計算工学会
Defect Chemistry and Thermodynamics in Oxygen Excess La2-xSrxNiO4+δ Invited

T. Nakamura, K. Yashiro, K. Sato, J. Mizusaki

Netsu Sokutei　42　(2)　47-53　2015/04
Publisher: 日本熱測定学会
ISSN： 0386-2615
中低温作動SOFCカソードの基礎物性と組織・界面設計

川田達也, 八代圭司, 橋本真一

Electrochemistry　83　(9)　739-745　2015

DOI： 10.5796/electrochemistry.83.739 　
スパッタ法により作成したBaCe_0.8Y_0.2O₃/水素膜燃料電池の発電性能

AOKI YOSHITAKA, KOBAYASHI SHOHEI, TSUJI ETSUSHI, HABAZAKI HIROKI, YASHIRO KEIJI, KAWADA TATSUYA

固体イオニクス討論会講演要旨集　40th　187-188　2014/11/16
OS1605 Ferroelastic Properties of Cathode Materials of Solid Oxide Fuel Cells

KIMURA Yuta, HASHIMOTO Shin-ichi, AMEZAWA Koji, YASHIRO Keiji, KAWADA Tatsuya

2014　"OS1605-1"-"OS1605-3"　2014/07/19
Publisher: The Japan Society of Mechanical Engineers

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Temperature and frequency dependence of Young's modulus and internal friction of La_<0.6>Sr_<0.4>Co_<0.2>Fe_<0.8>O_<3-δ> were evaluated by dynamic mechanical analysis. A relaxation peak in the internal friction which follows a significant decrease in the Young's modulus was observed. It was suggested that the peak was derived from domain reorientations. An introduction of oxygen vacancies into the sample significantly changed the temperature dependence of the Young's modulus and the internal friction. The Young's modulus became larger especially below 400 K. A small peak which depended on the oxygen vacancy concentration was observed when the oxygen vacancies were introduced. This peak was considered to be due to oxygen vacancy diffusion. Such significant changes in the temperature dependence of the Young's modulus and the internal friction may be caused by crystal structure change and pinning of domain walls by the oxygen vacancies.
OS1603 Mechanical properties evaluations under simulated operating condition for SOFC materials

WATANABE Satoshi, HASHIMOTO Shinichi, YASHIRO Keiji, KAWADA Tatsuya

2014　"OS1603-1"-"OS1603-3"　2014/07/19
Publisher: The Japan Society of Mechanical Engineers

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We have attempted to construct multiscale model which can simulate inelastic deformation and stress state under operating conditions. It would need to the information about mechanical properties of solid oxide fuel cell constituent materials under operating condition for analysis model building up process and simulation indeed. Therefore, mechanical property of Ni-YSZ and yttria stabilized zirconia, used as SOFC common materials are evaluated under simulated operating condition by developed In-situ mechanical testing machine. From experimental result, Ni-YSZ composite has showed that ductile-like deformation was induced under 800℃/H_2 condition for the Ni contents of 30 and 50 vol. % from the SP tests, and creep behavior is due to its ductility from creep tests. On the other hand, 8YSZ has showed creep rupture propagation guessed crack growth under air/850℃ condition.
La_0.6Sr_0.4CoO_3-δ緻密膜パターン電極のマイクロXAS測定による有効反応場の定量的解明

藤巻義信, 中村崇司, 八代圭司, 井口史匡, 湯上浩雄, 川田達也, 新田清文, 寺田靖子, 雨澤浩史

電気化学会大会講演要旨集　81st　2014
130 Evaluation of mechanical properties of Ni-YSZ cermets for SOFCs under simulated environments of redox cycling

MIYASAKA Taihei, SUKINOU Shinji, WATANABE Satoshi, YASHIRO Keiji, KAWADA Tatsuya, SATO Kazuhisa, HASHIDA Toshiyuki

2013　(48)　62-63　2013/03/15
Publisher: The Japan Society of Mechanical Engineers
Development of hybrid nano-processing techniques for smallscale solid oxide fuel cells

1-6　2013
Publisher: 旭硝子財団
ISSN： 1882-0069
J056044 Evaluation of Expansion Behavior of Ni-YSZ Cermets during Redox Cycling

MIYASAKA Taihei, SUKINOU Shinji, YASHIRO Keiji, KAWADA Tatsuya, MIZUSAKI Junichiro, SATO Kazuhisa, HASHIDA Toshiyuki

Mechanical Engineering Congress, Japan　2012　"J056044-1"-"J056044-3"　2012/09/09
Publisher: The Japan Society of Mechanical Engineers

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Effects of of the redox cycling on the volume expansion of Ni-YSZ cermets was investigated as a function of porosity and Ni/YSZ volume ratio by using a thermo-mechanical analysis (TMA). The first re-oxidation tests results obtained from TMA demonstrated that the amount of expansion was decreased and suppressed by lowering the Ni content of the anode and increasing the porosity. However specemen which had the large amount of Ni (50 vol.%) and the high porosity (34%) showed the high dimensional stability after several redox cycls. The large shrinkage upon reduction coused by the large amount of Ni and the low expantion upon oxidation caused by the high porosity enhanced redox reversibility.
214 Dimensional Behavior of Ni-YSZ Cermets during Redox Cycling

SUKINO Shinji, MIYASAKA Taihei, SATO Kazuhisa, YASHIRO Keiji, KAWADA Tatsuya, MIZUSAKI Junichiro, HASHIDA Toshiyuki

2012　(47)　234-235　2012/03/13
Publisher: The Japan Society of Mechanical Engineers
固体酸化物形燃料電池材料のヘテロ界面導入による高性能化

八代圭司

表面　50　(1)　4-5　2012/01
Solid Oxide Fuel Cells Xll 報告

川田達也, 鹿園直毅, 白鳥祐介, 堀内賢治, 堀田照久, 松井敏明, 門馬昭彦, 八代圭司, 山地克彦

燃料電池2011夏号　11　(1)　112-128　2011/07
固体イオニクスが支える環境エネルギー工学

八代圭司, 佐藤一永, 水崎純一郎

MATERIALS INTEGRATION　24　(04,05)　166-171　2011/05
26pRG-7 Electronic properties of La_<2-x>Sr_xNiO_<4+δ> at high temperatures

Nakamura T., Yashiro K., Sato K., Mizusaki J.

Meeting abstracts of the Physical Society of Japan　64　(2)　509-509　2009/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
雰囲気制御高温微重量天秤による金属酸化物の酸素不定比量の精密測定法

大石昌嗣, 八代圭司, 水崎純一郎

熱測定解説　34　(5)　206-213　2007/10
Publisher: Japan Society of Calorimetry and Thermal Analysis
DOI： 10.11311/jscta1974.34.206 　

ISSN： 0386-2615

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Various properties of the metal oxides are strongly affected by the nonstoichiometry. Therefore, nonstoichiometry is very important for understanding the basic character of the metal oxides. Nonstoichiometry of the metal oxides is often measured by the gravimetric measurements at high temperature under controlled atmospheres. As the vapor pressure of the metal is negligibly small compared to the oxygen, the nonstoichiometry behavior of the metal oxides is often measured as a function of the oxygen partial pressure.<br>In this article, a brief review is made for the experimental technique of nonstoichiometry measurements by means of high temperature gravimetry under controlled gas-atmospheres: The oxygen nonstoichiometry is measured as the weight change at different oxygen partial pressures. The principle of the measurement is very simple. However, as the measurement is carried out at the equilibrium conditions at the high temperature under controlled oxygen partial pressures, and moreover, as the measurements often extend over a long period of time, the precision and long-time stability of the measuring system are important. Other important reminders will also be shown for the measurements procedure of the gas controlled high temperature microbalance.
第７回ヨーロッパSOFCフォーラム概要報告

6　(2)　85-85　2006/04

ISSN： 1615-6846
213 Fracture Behavior of Ceria-based SOFCs under Simulated Operating Conditions

OMURA Hajime, SATO Kazuhisa, HASHIDA Toshiyuki, YUGAMI Hiroo, YASHIRO Keiji, KAWADA Tatsuya, MIZUSAKI Junichiro

2005　(40)　76-77　2005/03/15
Publisher: The Japan Society of Mechanical Engineers
CaF₂から真空中へのF^-イオンの放出特性

酒井孝明, 開米篤志, 大竹隆憲, 八代圭司, 川田達也, 水崎純一郎, 西岡将輝

電気化学会大会講演要旨集　72nd　2005
Emission Characteristics of F^- ions into Vacuum from Fluoride Ionic Conductor

酒井孝明, 開米篤志, 大竹孝憲, 八代圭司, 川田達也, 水崎純一郎, 西岡将輝

固体イオニクス討論会講演要旨集　31st　2005
Mechanical damage evaluation of solid oxide fuel cells under simulated operating conditions

Kazuhisa Sato, Toshiyuki Hashida, Keiji Yashiro, Hiroo Yugami, Tatsuya Kawada, Junichiro Mizusaki

Journal of the Ceramic Society of Japan　113　(1320)　562-564　2005
Publisher: Ceramic Society of Japan
DOI： 10.2109/jcersj.113.562 　

ISSN： 0914-5400
High temperature photovoltaic effect at the interface of ITO / Nb doped SrTiO3

Fumimasa Horikiri, Tomoyuki Ichikawa, Atsushi Kaimai, Keiji Yashiro, Hiroshige Matsumoto, Tatsuya Kawada, Junichiro Mizusaki

Proceedings - Electrochemical Society　PV 2004-16　203-209　2004/12/01
Development of performance evaluation testing method for SOFC

K. Sato, H. Omura, T. Hashida, K. Yashiro, T. Kawada, J. Mizusaki, H. Yugami, A. Atkinson

Proceedings - Electrochemical Society　PV 2004-16　170-176　2004/12/01
New in situ characterization of SOFC electrode

T Kawada, K Yashiro

ELECTROCHEMISTRY　72　(5)　343-348　2004/05

ISSN： 1344-3542
Solid Oxide Fuel Cells with a zirconia electrolyte

Junichiro Mizusaki, Tatsuya Kawada, Keiji Yashiro

FC report　21　168-174　2003/04
In-situ measurement of oxygen potential around (La,Sr)MnO3/YSZ interface

T Kawada, M Kudoh, K Yashiro, A Kaimai, Y Nigara, J Mizusaki

SOLID OXIDE FUEL CELLS VIII (SOFC VIII)　2003　(7)　470-477　2003
Impenance analysis of Gas electrode / solid electrolyte system

J.Mizusaki, T. Kawada, K. Yashiro, M. Sase

Materials Science, Technology　39　(2)　63-68　2002/04
Publisher: 日本材料科学会
ISSN： 1347-4774
特別講演協奏反応場での特異化学ポテンシャルの解明とガスセンシングへの展開

水崎純一郎, 八代圭司, 川田達也

Proceedings of the Chemical Sensor Symposium　31　88-90　2000/09
Publisher: 電気化学会化学センサ研究会

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Books and Other Publications 5

メタンと二酸化炭素

監修:上田渉、分担著:八代圭司

シーエムシー・リサーチ　2023/03

ISBN: 9784910581361
第6版電気化学便覧

水崎純一郎, 八代圭司

丸善出版　2013/01/15
The21st Century COE Program International COE of Flow Dynamics Lecture Series Volume9, Nano-Mega Scale Flow Dynamics in Energy Systems

Junichiro Mizusaki, Keiji Yashiro

Tohoku University Press　2008/02
燃料電池の解析手法

八代圭司

化学同人　2005/04
反応場制御による新しい材料プロセッシング－協奏増幅を利用した材料創成－

Junichiro Mizusaki, Tatsuya Kawada, Keiji Yashiro

IPC　2004/04

Presentations 57

Investigation of Mechanical Properties of Materials for Simulating SOFC Transient Behaviour International-presentation

T. Kawada, S. Watanabe, Y. Kimura, K. Sato, K. Yashiro, F. Iguchi, S. Hashimoto, T. Hashida, K. Terada, K. Amezawa, H. Yugami

Symposium for Fuel Cell and Battery Modeling and Experimental Validation （MODVAL13)　2016/03/22
Simulation Technology on SOFC Durability with an Emphasis on Conductivity Degradation of ZrO2-based Electrolyte International-presentation

Harumi Yokokawa, Haruo Kishimoto, Katsuhiko Yamaji, Mayu Muramatsu, Kenjiro Terada, Keiji Yashiro, Tatsuya Kawada

Symposium for Fuel Cell and Battery Modeling and Experimental Validation （MODVAL13)　2016/03/22
The electrode reaction mechanism analysis and electrode design on SOFC cathode International-presentation

Shin-ichi Hashimoto, Riyan Achmad Budiman, Yuya Uzumaki, Honami Kudo, Issei Susuta, Syunsuke Noda, Takaya Hoshi, Keiji Yashiro, Tatsuya Kawada

40th International Conference and Expo on Advanced Ceramics and Composites　2016/01/24
Quantitative Evaluation of Effective Reaction Area in Solid Oxide Fuel Cell Cathodes International-presentation

Koji Amezawa, Yoshinobu Fujimaki, Takashi Nakamura, Katherine D. Bagarinao, Katsuhiko Yamaji, Kiyofumi Nitta, Yasuko Terada, Keiji Yashiro, Fumitada Iguchi, Hiroo Yugami, Tatsuya Kawada

20th International Conference on Solid State Ionics (SSI-20)　2015/06/14
Effect of Chemomechanical Coupling on Defect Equilibrium and Transport in Solid State Ionic Devices International-presentation

Tatsuya Kawada, Yuta Kimura, Yuki Gonoi, Keiji Yashiro, Shin-ichi Hashimoto, Koji Amezawa

20th International Conference on Solid State Ionics (SSI-20)　2015/06/14
Determination of Effective Reaction Area in a Mixed-Conducting SOFC Cathode International-presentation

Koji Amezawa, Yoshinobu Fujimaki, Takashi Nakamura, Katherine Develos- Bagarinao, Katsuhiro Yamaji, Kiyofumi Nitta, Yasuko Terada, Fumitada Iguchi, Keiji Yashiro, Hiroo Yugami, Tatsuya Kawada

The 227th Meeting of The Electrochemical Society　2015/05/24
Surface Reaction of Doped Lanthanum Cobaltite System International-presentation

K. Yashiro, H. Sato, M. Sasaki, R. A. Budiman, S. Hashimoto, T. Nakamura, K. Amezawa, T. Kawada

39TH INTERNATIONAL CONFERENCE AND EXPOSITION ON ADVANCED CERAMICS AND COMPOSITES　2015/01/25
Influence of Surface Properties on Oxygen Reduction Reaction of MIEC Cathode International-presentation

Keiji Yashiro, Hiroki Sato, Yuki Gonoi, Takashi Nakamura, Shin-ichi Hashimoto, Yusuke Tamenori, Koji Amezawa, Tatsuya Kawada

11th European SOFC and SOE Forum 2014　2014/07/01
固体酸化物形燃料電池の現状と信頼性・耐久性向上のための材料開発

日本化学会東北支部最新電池技術市民講演会　2013/12/18

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主催日本化学会東北支部共催電気化学会東北支部、東北大学原子分材料科高等研究機構
Oxygen reduction reaction at hetero-interface between perovskite- and perovskite related oxides International-presentation

Keiji Yashiro, Hiroki Sato, Takashi Nakamura, Shinichi Hashimoto, Yusuke Tamenori, Junichiro Mizusaki, Koji Amezawa, Tatsuya Kawada

Thermec2013　2013/12/02
Development of Novel Cathode Materials for Low Temperature Solid Oxide Fuel Cells International-presentation

Keiji Yashiro

International Symposium for the 70th Anniversary of the Tohoku Branch of the Chemical Society of Japan　2013/09/29
ハイブリッドナノプロセッシングによる高効率小型燃料電池創製に向けた基盤技術開発

八代圭司, 井口史匡

旭硝子財団 2013助成研究発表会　2013/07/29
OXIDE ION AND ELECTRON TRANSPORT PROPERTIES IN LANTHANUM SILICATE OXYAPATITE CERAMICS International-presentation

Atsushi Mineshige, Hiroyuki Mieda, Mitsuaki Manabe, Takahiro Funahashi, Yusuke Daiko, Tetsuo Yazawa, Mina Nishi, Teruhisa Horita, Keiji Yashiro, Koji Amezawa, Tatsuya Kawada, Hideki Yoshioka

The 19th International Conference on Solid State Ionics　2013/06/02
EHNANCEMENT OF OXYGEN REDUCTION REACTION AT HETERO-INTERFACE ELECTRODE International-presentation

K. Yashiro, T. Nakamura, Y. Tamenori, J. Mizusaki, K. Kawada, K. Amezawa

The 19th International Conference on Solid State Ionics　2013/06/02
ELECTRONIC STRUCTURES OF SOFC OXIDE CATHODES STUDIED BY IN SITU SOFT X-RAY ABSROPTION SPECTROSCOPY International-presentation

Koji Amezawa, Ryo Oike, Yusuke Tamenori, Keiji Yashiro, Takashi Nakamura, Tatsuya Kawada

The 19th International Conference on Solid State Ionics　2013/06/02
ANALYSIS OF STRUCTUREL PHASE TRANSITION BEHAVIOR OF Ln2NiO4+d (Ln : Nd, Pr) WITH VARIATION OF OXYGEN CONTENT International-presentation

Eiki Niwa, Kazuya Waka, Tetsuya Hori, Keiji Yashiro, Junichiro Mizusaki, Takuya Hashimoto

The 19th International Conference on Solid State Ionics　2013/06/02
SIMULATION OF OXYGEN DIFUSSION PROCESS ON ELECTRICAL CONDUCTIVITY RELAXATION International-presentation

Honami Kudo, Keiji Yashiro, Shin-ichi Hashimoto, Koji Amezawa, Tatsuya Kawada

The 19th International Conference on Solid State Ionics　2013/06/02
CHEMICAL STABILITY OF BSCF-BASED SOLID SOLUTION International-presentation

Fang Wang, Keiji Yashiro, Takashi Nakamura, Junichiro Mizusaki, Koji Amezawa

The 19th International Conference on Solid State Ionics　2013/06/02
OXYGEN REDUCTION MECHANISM ON LaNi1-xFexO3-d FILM ELECTRODE International-presentation

Riyan Achmad Budiman, Shin-ichi Hashimoto, Takashi Nakamura, Keiji Yashiro, Koji Amezawa, Tatsuya Kawada

The 19th International Conference on Solid State Ionics　2013/06/02
(Ba,Sr)(Co,Fe)O3-δ 系材料の安定性と電気化学的性質に及ぼすNb添加の影響

王芳, 八代圭司, 中村崇司, 水崎純一郎, 雨澤浩史

電気化学会創立８０周年記念大会　2013/03/29
ペロブスカイト関連酸化物のヘテロ界面における酸素還元特性

八代圭司, 中村崇司, 水崎純一郎, 川田達也, 雨澤浩史

電気化学会創立８０周年記念大会　2013/03/29
高温雰囲気制御軟Ｘ線吸収分光測定によるランタンコバルト系酸化物の電子状態の評価

大池諒, 雨澤浩史, 為則雄祐, 八代圭司, 中村崇司, 川田達也

電気化学会創立８０周年記念大会　2013/03/29
In situ X-Ray Absorption Spectroscopy for Analysis of SOFC Reactions and Materials International-presentation

K.Amezawa, Y.Fujimaki, R.Oike, Y.Orikasa, T.Ina, Y.Terada, K.Nitta, Y.Tamenori, T.Uruga, T.Nakamura, K.Yashiro, T.Kawada, Y.Uchimoto

International Symposium on Simulations and Measurements for Electrochemistry in SOFC2013(ISSM-SOFC2013)　2013/03/11
Oxygen defects and rystal structure of layered perovskite oxides International-presentation

Takashi Nakamura, Keiji Yashiro, Kazuhisa Sato, K.Amezawa, Junichiro Mizusaki

International Symposium on Simulations and Measurements for Electrochemistry in SOFC2013(ISSM-SOFC2013)　2013/03/11
Oxygen reduction reaction at hetero-interface electrode of perovskite-related oxides International-presentation

K. Yashiro, T. Nakamura, J. Mizusaki, T. Kawada, K. Amezawa

International Symposium on Simulations and Measurements for Electrochemistry in SOFC2013(ISSM-SOFC2013)　2013/03/11
添加種、添加量を変化させた希土類添加セリアの高温・雰囲気制御下における弾性率の評価

遠藤靖大, 白井良和, 木村勇太, 中村崇司, 八代圭司, 橋本真一, 雨澤浩史, 川田達也

第51回セラミックス基礎科学討論会　2013/01/09
SOFC構成材料の物理化学的・機械的特性とセル・スタックの信頼性

川田達也, 渡辺智, 坂本正, 尾澤伸樹, 佐藤一永, 橋田俊之, 宇根本篤, 八代圭司, 雨澤浩史, 水崎純一郎, 井口史匡, 橋本真一, 湯上浩雄, 寺田賢二郎

第21回SOFC研究発表会　2012/12/17
SOFC低温作動化を目指したヘテロ界面電極の創成

八代圭司, 中村崇司, 水崎純一郎, 雨澤浩史, 井口史匡, 柴田佳和, 大沢洋平, 熊谷貴博, 湯上浩雄, 川田達也

第21回SOFC研究発表会　2012/12/17
高温制御雰囲気下におけるSOFC構成材料の機械的特性評価

白井良和, 木村勇太, 遠藤靖大, 川田達也, 中村崇司, 八代圭司, 雨澤浩史, 水崎純一郎, 佐藤一永, 橋本真一

第21回SOFC研究発表会　2012/12/17
実環境計測に基づく高性能SOFC電極の設計

雨澤浩史, 中村崇司, 八代圭司, 藤巻義信, 川田達也, 大池諒, 井口史匡, 橋本真一, 湯上浩雄, 寺田靖子, 為則雄祐

第21回SOFC研究発表会　2012/12/17
Chemical stability of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) International-presentation

Wang Fang, Keiji Yashiro, Takashi Nakamura, Koji Amezawa, Junichiro Mizusaki

The 3rd Symposium of the Research Center for Sustainable Science & Engineering　2012/12/17
Layered perovskite-type oxides, Pr2-xSrxNiO4+d, for cathode of solid oxide fuel cells International-presentation

Keiji Yashiro, Tetsuya Hori, Junichiro Mizusaki, Koji Amezawa

The 3rd Symposium of the Research Center for Sustainable Science & Engineering　2012/12/17
LaNi0.6Fe0.4O3-δ の酸素不定比性と欠陥平衡

丹羽栄貴, 八代圭司, 雨澤浩史, 水崎純一郎, 橋本拓也

第12回東北大学多元物質科学研究所研究発表会　2012/12/10
SOFC作動環境下でのその場ラマン分光法による安定化ジルコニア相変態現象の解明

岸本治夫, 八代圭司, 雨澤浩史, 水崎純一郎

第12回東北大学多元物質科学研究所研究発表会　2012/12/10
LaNi0.6Fe0.4O3-δ の欠陥平衡と導電機構

丹羽栄貴, 植松千絵, 八代圭司, 水崎純一郎, 橋本拓也

第38回固体イオニクス討論会　2012/12/03
LaPO4における欠陥の熱平衡濃度と導電特性の相関

松尾宙晃, 高橋勇人, 桑原彰秀, 雨澤浩史, 八代圭司, 中村崇司, 橋本真一, 川田達也

第38回固体イオニクス討論会　2012/12/03
高温・制御雰囲気下における軟エックス線吸収分光測定技術の開発

雨澤浩史, 為則雄祐, 大池諒, 八代圭司, 中村崇司, 川田達也

第38回固体イオニクス討論会　2012/12/03
Novel and Conventional Approaches for the Design of Solid State Ionic Devices International-presentation

Takashi Nakamura, Keiji Yashiro, Koji Amezawa

5th french-japanese joint workshop on FRONTIER MATERIALS　2012/12/02
高温制御雰囲気下でのin situ X線吸収分光測定

雨澤浩史, 八代圭司, 中村崇司

平成24年度新エネルギー材料・デバイスプロジェクトグループ研究会　2012/10/30
Mechano-electrochemical effect on materials property of ion conducting oxides International-presentation

Keiji Yashiro, Yusuke Kawamura, Shusaku Nakakawaji, Kazuhisa Sato, Koji Amezawa, Junichiro Mizusaki

Pacific Rim Meeting 2012(PRIME2012)　2012/10/07
Oxygen Transport in Perovskite Type Oxide La0.6Sr0.4Co0.2Fe0.8O3-δ International-presentation

Honami Kudo, Keiji Yashiro, Shin-ichi Hashimoto, Koji Amezawa, Tatsuya Kawada, Junichiro Mizusaki

Pacific Rim Meeting 2012(PRIME2012)　2012/10/07
Material characterization of nonstoichiometric layered perovskite-type oxides, Pr2-xSrxNiO4+d International-presentation

Keiji Yashiro, Tetsuya Hori, Koji Amezawa, Junichiro Mizusaki

ECI Nonstoichiometric Compounds V　2012/09/23
Mechanical Properties of Calcium-Substituted Lanthanum Chromite at High Temperature under Controlled Atmosphere International-presentation

Yoshikazu Shirai, Yuta Kimura, Keiji Yashiro, Shin-Ichi Hashimoto, Koji Amezawa, Tatsuya Kawada

ECI Nonstoichiometric Compounds V　2012/09/23
Chemical stability of the cubic phase of Ba0.5Sr0.5Co0.8Fe0.2O3-δ(BSCF) International-presentation

Wang Fang, Keiji Yashiro, Koji Amezawa Junichiro Mizusaki

9th International Conference on Flow Dynamics　2012/09/19
Ce0.6La0.4O2-δの酸素不定比性および加湿条件下での重量変化

佐藤宏樹, 橋本真一, 八代圭司, 雨澤浩史, 川田達也

第８回固体イオニクスセミナー　2012/09/02
その場マイクロXAS測定を用いたSOFC多孔質空気極における酸素ポテンシャル分布の実験的評価

雨澤浩史, 藤巻義信, 渡邉秀貴, 木村勇太, 寺田靖子, 橋本真一, 八代圭司, 川田達也

第８回固体イオニクスセミナー　2012/09/02
導電性セラミックスにおける導電特性とひずみの関係性

中村崇司, 川村佑介, 中川路周作, 八代圭司, 雨澤浩史, 水崎純一郎

第８回固体イオニクスセミナー　2012/09/02
The Correlationship between Oxygen Nonstoichiometry and other Material Natures in La0.6Sr0.4Co1-yFeyO3-δ (y=0, 0.2, 0.4, 0.5, 0.6, 0.8, 1) Cathode International-presentation

Shin-ichi Hashimoto, Mi-Young Oh, Yu-Cheol Shin, XinXin Li, Yuta Kimura, Koji Amezawa, Tatsuya Kawada, Yasuhiro Fukuda, Issei Nakano, Melanie Kuhn, Kazuhisa Sato, Keiji Yashiro, Junichiro Mizusaki

International Union of Materials Research Society - International Conference in Asia 2012(IUMRS-ICA)　2012/08/27
The conductivity property and chemical stability of BSCF under different partial pressure International-presentation

F.Wang, K.Yashiro, J.Mizusaki

The 13th Asian Conference on Solid State Ionics　2012/07/17
EFFECTS OF A PHASE TRANSITION AND OXYGEN NONSTOICHIOMETRY ON ELASTIC MODULUS OF La0.6Sr0.4Co1-yFeyO3-δ International-presentation

YUTA KIMURA, TAKUTO KUSHI, TATSUYA KAWADA, SHIN-ICHI HASHIMOTO, KOJI AMEZAWA, KEIJI YASHIRO, JUNICHIRO MIZUSAKI

The 13th Asian Conference on Solid State Ionics　2012/07/17
LaNi^1-xFe^xO^3-δの高温安定性と酸素不定比性

丹羽栄貴, 植松千絵, 八代圭司, 水崎純一郎, 橋本拓也

電気化学会第79回大会　2012/03/29
Ln2NiO4+δ系酸化物の機械電気化学的特性

中川路周作, 川村祐介, 桑原彰秀, 佐藤一永, 八代圭司, 水崎純一郎

電気化学会第79回大会　2012/03/29
SOFC作動環境下におけるジルコニア電解質の相変態のその場観察

岸本治夫, 八代圭司, 下之薗太郎, 西美奈, 山地克彦, Manuel E. Brito, 堀田照久, 横川晴美, 水崎純一郎

電気化学会第79回大会　2012/03/29
ナノ加工技術によるSOFC用高機能ヘテロ界面電極の創成

八代圭司, 井口史匡, 稲垣優, 小野寺祥, 藤原雄太, 湯上浩雄, 水崎純一郎

電気化学会第79回大会　2012/03/29
ペロブスカイト型酸化物(La, Sr)(Co,Fe)O3の酸素輸送過程

工藤ほなみ, 中野一誠, 八代圭司, 水崎純一郎

電気化学会第79回大会　2012/03/29
層状ペロブスカイト酸化物Pr2-xSrxNiO4+δの固体酸化物形燃料電池への応用に向けた材料特性

堀哲也, 八代圭司, 水崎純一郎

電気化学会第79回大会　2012/03/29
Challenges for Lowering Operation Temperature of SOFC International-presentation

Low Carbon Earth Summit-2011 (LCES-2011)　2011/10/19

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Industrial Property Rights 8

固体酸化物形燃料電池セルの評価方法および固体酸化物形燃料電池システム

佐藤康司, 松岡孝司, 工藤孝夫, 雨澤浩史, 八代圭司, 中村崇司, 大村信亮

Property Type: Patent
電極、並びに、固体酸化物形燃料電池及び電解装置

香山智之, 雨澤浩史, 八代圭司, 中村崇司

Property Type: Patent
固体酸化物形燃料電池用のアノード支持体、アノード支持型固体酸化物形燃料電池、及び燃料電池システム

佐藤康司, 谷口貴章, 工藤孝夫, 川田達也, 八代圭司, 橋本真一, 進藤大樹, 雨澤浩史, 中村崇司

Property Type: Patent
エネルギー変換装置用電極、それを用いたエネルギー変換装置およびエネルギー変換方法

香山智之, 八代圭司, 水崎純一郎

Property Type: Patent
複合材料

香山智之, 八代圭司, 水崎純一郎

Property Type: Patent
複合金属酸化物およびその製造方法、並びにそれを用いた電極材料、電極および固体酸化物形燃料電池

水崎純一郎, 佐藤一永, 八代圭司

Property Type: Patent
電気化学セル評価用ホルダ

江川益博, 八代圭司, 水崎純一郎

Property Type: Patent

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固体酸化物形燃料電池（SOFC）単セル評価用ホルダ評価試験装置発売（2006年5月9日） http://www.chino.co.jp/news/2006/0509.html
電気化学セル用電極及び電気化学セル

松本広重, 高村仁, 水崎純一郎, 川田達也, 八代圭司

Property Type: Patent

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Research Projects 16

Integrated Fuel Cell System Aboard Spacecraft And Applications

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Japan Aerospace EXploration Agency

2018/04/01 - 2023/03/31
Development of equivalent circuit analysis method for multi-carrier-conductor/electrode systems

Kawada Tatsuya

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2019/04/01 - 2022/03/31

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Transport properties of proton-conducting oxides, which are expected as electrolytes for high efficiency fuel cells, are affected by the mobile holes and oxide ions. An equivalent circuit model was proposed to enable simple evaluation of their behaviors using a general-purpose circuit simulator. A surrogate model with the gas-solid exchange resistances of hydrogen, water vapor, and oxygen as parameters was developed for a fast search for combinations of electrode resistances that reproduce the experimental results. Transport constants which are necessary for the calculation were measured, and the calculated results were experimentally verified.
Reaction pathway in mixed-conducting oxide electrodes investigated by using patterned thin film model electrode

Amezawa Koji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2018/04/01 - 2021/03/31

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In this work, the identification of reaction path in solid oxide fuel cell (SOFC) cathodes, in particular, separate evaluation of the contribution of electrode reaction through triple/double phase boundaries, were performed. For these purposes, we proposed and fabricated original model electrodes, so-called patterned thin film electrode, and performed electrochemical/spectroscopic measurements with them. As results, dominant reaction path in conventional SOFC cathodes were identified. It was found that the contribution of the reaction through triple phase boundaries were significant even in mixed ionic and electronic conducting SOFC cathodes. This finding demonstrated that a new concept considering the contribution of triple phase boundary is necessary for the design of high performance SOFC cathode. Furthermore, the proposed patterned thin film electrode was also applied to investigate the mechanism of Cr poisoning for SOFC cathodes.
Operand analysis of electronic structures of functionalized oxides by simultaneous soft X-ray absorption and emission spectroscopy measurements

Amezawa Koji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2014/04/01 - 2017/03/31

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In this work, we succeeded to establish operando soft X-ray absorption and emission spectroscopic (SXAS and SXES) techniques, which enable us to simultaneously evaluate electronic structures in occupied and unoccupied orbitals of functionalized oxides while controlling temperature, atmosphere, and polarization. The developed techniques were applied to investigate the electronic structures of complex oxides containing 3d transition metals for the solid oxide fuel cell cathodes under their operating conditions. The developed operando SXAS and SXES techniques are expected as a powerful tool for the deep understandings of materials' functions and their natures by clarifying the electronic structures under their usage environments.
Innovative design of electrochemical functional interface for efficient energy conversion systems Competitive

System: JST Basic Research Programs (Precursory Research for Embryonic Science and Technology :PRESTO)

2011/11 - 2015/03
Development of in situ soft X-ray absorption spectroscoy for analysis of ceramics materials in high temperature devices

AMEZAWA Koji, YASHIRO Keiji, HASHIMOTO Shin-ichi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2012/04/01 - 2014/03/31

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In this work, in situ soft X-ray absorption spectroscopic technique, which can be used to analyze electronic structures of functionalized oxides under controlled atmosphere, temperature and polarization, was established. By applying the differential evacuation system for ambient pressure soft x-ray spectrocopy togehter with the specific sample holder developed in this work, in situ soft X-ray absroption spectroscopic measurements were made possible at high temperature while controlling atmosphere under polarization. Through measurements with LaCoO3 and La2NiO4 as model oxides, it was found that absorption spectra could be clearly obtained below 873 K of temperature and 0.01 bar of oxygen partial pressure.The established in situ analytical technique can be a powerful and versatile tool for the direct observation of electronic structures of functionalized oxides used for high temperature devices.
In situ evaluation of potential distribution in high temperature electrochemical devices

AMEZAWA Koji, KAWADA Tatsuya, IGUCHI Fumitada, HASHIMOTO Shin-ichi, YASHIRO Keiji, UNEMOTO Atsushi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2010 - 2012

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The chemical potential distribution of the reactive atomic species in high temperature electrochemical devices, such as the oxygen chemical potential in solid oxide fuel cells (SOFCs), was experimentally evaluated under device operating conditions. As results, we succeeded for the first time to clarify the oxygen potential distribution and the effective reaction area in the SOFC mixed-conducting porous cathode. Influences of such a chemical potential distribution on the device performance and durability were also investigated from the thermodynamic and kinetic points of view, taking the SOFC porous cathode as a model case.
Defect structure and ion transport in Perovskite-type proton conductors

YASHIRO Keiji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

Category: Grant-in-Aid for Young Scientists (B)

Institution: Tohoku University

2008 - 2009

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Chemical diffusion coefficients, D_<chem>, of Sr(Zr,Y)O_3、Ba(Ce,Y)O_3 were determined by conductivity relaxation method. Dchem are essentially independent of partial pressures of hydrogen and water. Self diffusion coefficients of oxygen vacancy and hydrogen were estimated from D_<chem> and defect concentration. As a result, the self diffusion coefficients seem to be independent of the gas partial pressures. These results are supported by isotope diffusion experiments.
Nano-ionic Structure for the Development of High Performance Solid Oxide Fuel Cells

MIZUSAKI Junichiro, HASHIDA Toshiyuki, YASHIRO Keiji, SATO Kazuhisa

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas

Category: Grant-in-Aid for Scientific Research on Priority Areas

Institution: Tohoku University

2004 - 2008
非平衡ガス反応における特異化学ポテンシャル場形成と反応制御

Offer Organization: JSPS

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A)

Institution: Tohoku University

2003 - 2005
Defect Equilibrium of Perovskite-type and Related Oxides in a Thin Film or a Micro Device

MIZUSAKI Junichiro, YASHIRO Keiji, KAWADA Tatsuya, MATSUMOTO Hiroshige

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2001 - 2004

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1.Oxygen nonstoichiometry in a (La, Sr)CoO3 film on a (Ce, Gd)O2 substrate was investigated. Instead of using a thermogravimetry, a new electrochemical technique was developed. The electrochemical impedance was measured for the thin film using the (Ce, Gd)O2 substrate as an electrolyte. Since the rate determining step was surface reaction, the high frequency ac current measured the quantity of oxygen which is transported between the film and the electrolyte. The frequency response of the impedance gave the oxygen nonstoichiometry change. Several (La, Sr)CoO3 films of various Sr content were evaluated.. Enthalpy of oxygen vacancy formation was found to be larger for the films than for the bulk. This implies that the film shows smaller oxygen vacancy concentration than expected from the reported data for the bulk. Effect of grain size and the type of substrate on the vacancy formation enthalpy was investigated to find no clear evidence. 2.Several separate topics were investigated on the relation between microstructure and nonstoichiometry of perovskites. (1)The reason of oxygen excess nonstoichiometry of LaMnO3 was confirmed to be the formation of cation vacancy. A sever change of microstructure was observed on the surface of LaMnO3 due to the formation and annihilation of cation vacancies. (2)A slow cation diffusion in an n-type SrTiO3 was found to limit the cation equilibration to a thin layer around the surface. Several unique functions, such as high temperature rectification function, were found to originate from the existence of the surface layer. (3)Microscopic fluctuation of composition in (La, Ca)(Cr, Al)O3 solid solution was found to affect its macroscopic oxygen nonstoichiometry. Quantitative representation of the oxygen nonstoichiometry was developed including the local composition fluctuation.
The basic research and development of micro solid oxide fuel cells

Offer Organization: NEDO

2000/11 - 2003/03
mICROANALYSIS OF dEPOSITION AND ELECTROCHEMICAL oXIDATION OF cARBON ON AN eLECTROCHEMICAL SYSTEM UNDER hYDROCARBON gASES

KAWADA Tatsuya, YASHIRO Keiji, NIGARA Yutaka, YUGAMI Hiroo, MIZUSAKI Junichiro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: TOHOKU UNIVERSITY

2000 - 2001

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In-situ Raman microscope analysis was performed to investigate carbon deposition and its electrochemical oxidation on a fuel electrode of a solid oxide fuel cell, and the following results were obtained. 1. We have developed a sample heating stage that was specially designed for high temperature electrochemical testing under optical microscope and Raman microscope. Two separate chambers were installed into the stage, which enabled a sample electrolyte pellet to be placed under fuel gas and air. By using the heating stage, it was possible to investigate observe carbon deposition processes at electrode/electrolyte system under a thermodynamically controlled atmospheres. 2. Electrochemical oxidation process of methane was investigated by combined electrochemical measurements and gas analysis. It was found that oxidation of methane proceeds not directly but via local steam reforming processes on the electrode. 3. Platinum and nickel model electrodes were fabricated on yttria stabilized zirconia electrolyte pellets. Microscopic observation of the carbon deposition, as well as the characterization of the deposited carbon were performed under methane and liquid petroleum gasses (LPG, n-butane). In the case of platinum electrode under LPG, two Raman bands called 'D-band' and 'G-band' were observed indicating the deposition of disordered carbon and graphite, respectively. The deposition of carbon can be observed also by optical microscope as color change of electrode surface. Optical microscope observation revealed that the carbon is deposited not uniformly on the electrode but expands gradually from the position where the first carbon is deposited. On the other hand, on a nickel electrode under methane fuel, only graphite was found by Raman spectroscopy. The deposited graphite was hard to be removed by electrochemical pumping of oxygen through the electrolyte.
化学ポテンシャル勾配下におけるセラミックス複酸化物の腐食分解

水崎純一郎, 河村憲一, 二唐裕, 川田達也, 八代圭司

Offer Organization: 日本学術振興会

System: 科学研究費助成事業萌芽的研究

Category: 萌芽的研究

Institution: 東北大学

1999 - 2001

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ペロブスカイト型ABO_3,スピネル型AB_2O_4等の複酸化物が元の酸化物AO_2,BO等から生成する生成自由エネルギーは金属の酸化等に比べて極めて小さい.従って,複酸化物を挟んで化学ポテンシャル差が与えられると,熱力学的にはこの複酸化物は容易に元の単純酸化物に分離する筈である.この分離はイオン移動を伴うため,この現象がどの程度起こるかはイオンの拡散がどの程度起こるかによって決まると考えられる.本研究では固体酸化物燃料電池材料であるペロブスカイト型酸化物LaMnO_3,YCrO_3などをモデル物質として取り上げ,この腐食分解現象を実証し,理論との関連を示すことを目指した. 昨年度までに理論計算により,広い範囲で固溶体形成する系では1000℃以上でも腐食分解が起こるまでの時間は観測可能範囲の時間を超えること,ペロブスカイト型酸化物の様に二種の金属イオンが異なる結晶学的位置を占める系では,SIMSで観測できる程度の腐食分解の兆候は数百時間で起こり得ることなどが示され,LaMnO_3についての直流印可の下での実験でその実証が行われた. 本年度は酸素ポテンシャル勾配下での実験をLaMnO_3,La_<0.7>Sr_<0.3>MnO_3について進めた.前者はLa/Mn比に0.9-1.0にわたる不定比組成幅があり,その安定範囲が酸素分圧によって変わるためにMn酸化物析出が起こることが判り,酸素ポテンシャル勾配下での腐食分解を明確に実証することが困難であると結論された.後者では,酸素ポテンシャル勾配を与えた後の試料表面に,ポテンシャル勾配の方向に依らず酸化ランタンが析出する予想外の結果が出た.LaMnO_3中のLaの拡散がMn拡散より著しく速い場合,腐食分解で析出した酸化マンガンは移動してきたランタンと反応してペロブスカイト相に戻るのに対して,析出した酸化ランタンは取り残されてしまうことが原因と考えられる.
Developmert of Scanning Chemical Potertial Microscope

KAWADA Tatsuya, NIGARA Yutaka, KAWAMURA Kenichi, YASHIRO Keiji, MIZUSAKI Junichiro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

1999 - 2000

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The objective of this research has been to develop a "scanning chemical potential microscope" that measures the chemical potential profiles on catalysts or electrodes in order to investigate the reaction kinetics. In this research project, we have invented an oxygen potential probe, and applied it for the investigation of gas electrode reaction on a solid oxide electrolyte. (1)The concept of Porous Oxygen Sensor (POS), was developed. Stabilized zirconia or ceria was sintered into a porous pellet, and put on a sample surface. Oxygen potential on the sample surface was measured against a Pt reference electrode that was applied on the other side of POS by a potentiometric method. (2) The POS method was successfully applied to the kinetic study of oxygen incorporation reaction through a mixed ionic / electronic conductor electrode. The overvoltage for the two surface reaction processes were determined by using POS. (3) Kinetic model and the parameters obtained by POS were quite reasonable, proving that POS method is usable for a quantitative analysis. (4) POS microprobes were fabricated by coating zirconia powders on Pt based metal wires. The topologically identical structure with normal POS was realized in a micrometer space. A commercial probe for micro thermal analysis was used as a fine Pt-Rh probe base. It was coated with YSZ in two methods, i.e. slurry coating and thermal decomposition of metal organic precursors. By the latter method, a fine probe with lateral resolution higher than one micron was fabricated. (5) Sample heating stage was fabricated for the in-situ measurements of YSZ based electrolyte. It was installed on an atomic force micro probe scanner, and operated at 700 ℃. (6) Space resolved analysis of surface oxygen potential was successfully performed on a LaMnO3 based electrode.
ON THE POSSIBILITY OF VACANCY FORMATION ON THE B-SITE, THE FRAMEWORK, OF PEROVSKITE-TYPE OXIDES

MIZUSAKI Junchiro, KAWAMURA Kenichi, NIGARA Yutaka, KAWADA Tatsuya, YASHIRO Keiji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: TOHOKU UNIVERSITY

1998 - 2000

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In the perovskite-type oxides, ABO_3, oxygen vacancies are easily formed while metal vacancies are not. Particularly, B-site vacancy is considered hardly exists because they are closely linked each other via oxygen ions to form a rigid crystal structure. LaMnO_3-based perovskite-type oxides are known to display metal deficient nonstoichiometry under oxygen rich atmospheres. The defect structure related to this nonstoichiometry has been a big unsolved problem. Neutron and X-ray diffraction studies could not reveal the position of defects whether on A-site only or on both A- and B-site. Moreover, there is no clear experimental evidence whether the predominant defect is oxygen interstitial or metal vacancy. This project aims to clarify the nature of defects in the perovskite-type oxides with particular focus on the metal deficient nonstoichiometry of LaMnO_3. Measurements were made on volume variation of dense LaMnO_3 with the variation of oxygen partial pressure between 0.0001 and 1 atm by a dilatometer. A sample of 15 mm in length expands with oxidation and contracts with reduction for 10 〜 20 μm in 10 days. A high temperature XRD analysis gives the change of lattice volume in the inverse direction. This result infers the predominant defect of metal deficient LaMnO_3 as metal vacancy. Since the diffusion of ions proceeds via vacancy, the diffusivity of A- and B-site ions are measured to compare the defect concentration of both sites. As an example of oxygen deficient perovskite-type oxides, YCrO_3 was selected and impurity diffusion coefficient of La on A-site and Mn on B-site were measured. Unexpectedly, the diffusion coefficient of La and Mn was essentially the same, suggesting that the concentration of vacancy on A- and B-site are the same. As to the metal deficient LaMnO_3, impurity difusion on B-site was found smaller than that on A-site by several orders of magnitude. In the metal deficient LaMnO_3, vacancies are predominantly formed on A-site.

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Social Activities 3

経済産業省資源エネルギー庁主催新エネルギー総合展示会（NE-EXPO）

2006/12/08 - 2006/12/09

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ブース展示による研究紹介
独）物質・材料研究機構主催環境・エネルギー材料研究展

2008/05/30 -

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ポスター展示による研究紹介
ガイアの夜明け脱石油！エネルギー大革命～燃料電池が世界を変える～

2003/02/16 -

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さきがけ：高効率エネルギー変換に向けた革新的イオン機能界面設計

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環境・エネルギー材料として期待されるイオン導電性酸化物の更なる高性能化を図ることで、燃料電池や水素分離膜などの高効率化、大幅なコストダウンが期待できます。本研究では、従来の置換固溶を基礎とした高性能化手法に代わり、高機能ヘテロ界面の設計などイオン伝導性を飛躍的に向上させる界面エンジニアリングによる革新的な材料設計の基盤技術を確立することを目指します。
ハイブリッドナノプロセッシングによる高効率小型燃料電池創製に向けた基盤技術開発

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ハイブリッドナノプロセッシングによる高効率小型燃料電池創製に向けた基盤技術開発
ナノ結晶導電性酸化物におけるイオン伝導とサイズ効果

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ナノ結晶導電性酸化物におけるイオン伝導とサイズ効果
高温その場観察手法による高性能・高信頼性SOFC燃料極開発への展開

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固体酸化物形燃料電池の燃料極の高信頼性・高性能化を狙い、その場計測法を生かしたNiサーメット燃料極での評価を行った。
μSOFCの基礎技術開発

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固体酸化物燃料電池(SOFC)を小型化し耐熱衝撃性を大幅に向上させたμSOFC用の各部材の最適化および特性評価を行う．さらに選定した材料を用いた大容量化に適したスタック形態を提案し，実際にラボレベルのセルスタックを組んで実用化の可能性を探る．