Details of the Researcher

PHOTO

Jang Seonghoon
Section
Advanced Institute for Materials Research
Job title
Specially Appointed Assistant Professor(Research)

Papers 24

  1. Mott insulating state of IrO6 honeycomb monolayer structured in ilmenite-type oxide superlattice

    Masamichi Negishi, Kohei Fujiwara, Seong-Hoon Jang, Yi-Feng Zhao, Shun Sasano, Ryo Ishikawa, Naoya Shibata, Daisuke Shiga, Hiroshi Kumigashira, Yuto Nakamura, Hideo Kishida, Yukitoshi Motome, Atsushi Tsukazaki

    Physical Review Materials　2025/08/12

    DOI： 10.1103/gz4v-8mds 　

  2. Dissimilar Diffusion Mechanisms of Li+, Na+, and K+ Ions in Anhydrous Fe-Based Prussian Blue Cathode

    Dan Ito, Seong-Hoon Jang, Hideo Ando, Toshiyuki Momma, Yoshitaka Tateyama

    Journal of the American Chemical Society　2025/07/23

    DOI： 10.1021/jacs.5c05274 　

  3. Dual influence of protonation on Li-ion transport in garnet solid electrolytes: A first-principles study Peer-reviewed

    Feye-Feng Lu, Huu Duc Luong, Seong-Hoon Jang, Randy Jalem, Yoshitaka Tateyama, Hong-Kang Tian

    Journal of Power Sources　2025/02

    DOI： 10.1016/j.jpowsour.2024.235906 　

  4. GoodRegressor: A General-Purpose Symbolic Regression Framework for Physically Interpretable Materials Modeling

    Seong-Hoon Jang

    2025

    Publisher: arXiv

    DOI： 10.48550/ARXIV.2510.18325 　

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    Symbolic regression offers a promising route toward interpretable machine learning, yet existing methods suffer from poor predictability and computational intractability when exploring large expression spaces. I introduce GoodRegressor, a general-purpose C++-based framework that resolves these limitations while preserving full physical interpretability. By combining hierarchical descriptor construction, interaction discovery, nonlinear transformations, statistically rigorous model selection, and stacking ensemble, GoodRegressor efficiently explores symbolic model spaces such as $1.44 \times 10^{457}$, $5.99 \times 10^{124}$, and $4.20 \times 10^{430}$ possible expressions for oxygen-ion conductors, NASICONs, and superconducting oxides, respectively. Across these systems, it produces compact equations that surpass state-of-the-art black-box models and symbolic regressors, improving $R^2$ by $4\sim40$ %. The resulting expressions reveal physical insights, for example, into oxygen-ion transport through coordination environment and lattice flexibility. Independent ensemble runs yield nearly identical regressed values and the identical top-ranked candidate, demonstrating high reproducibility. With scalability up to choices without interaction terms, GoodRegressor provides a foundation for general-purpose interpretable machine intelligence.

  5. "DIVE" into Hydrogen Storage Materials Discovery with AI Agents

    Di Zhang, Xue Jia, Tran Ba Hung, Seong Hoon Jang, Linda Zhang, Ryuhei Sato, Yusuke Hashimoto, Toyoto Sato, Kiyoe Konno, Shin-ichi Orimo, Hao Li

    2025

    Publisher: arXiv

    DOI： 10.48550/ARXIV.2508.13251 　

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    Data-driven artificial intelligence (AI) approaches are fundamentally transforming the discovery of new materials. Despite the unprecedented availability of materials data in the scientific literature, much of this information remains trapped in unstructured figures and tables, hindering the construction of large language model (LLM)-based AI agent for automated materials design. Here, we present the Descriptive Interpretation of Visual Expression (DIVE) multi-agent workflow, which systematically reads and organizes experimental data from graphical elements in scientific literatures. We focus on solid-state hydrogen storage materials-a class of materials central to future clean-energy technologies and demonstrate that DIVE markedly improves the accuracy and coverage of data extraction compared to the direct extraction by multimodal models, with gains of 10-15% over commercial models and over 30% relative to open-source models. Building on a curated database of over 30,000 entries from 4,000 publications, we establish a rapid inverse design workflow capable of identifying previously unreported hydrogen storage compositions in two minutes. The proposed AI workflow and agent design are broadly transferable across diverse materials, providing a paradigm for AI-driven materials discovery.

  6. Physically interpretable descriptors drive the materials design of metal hydrides for hydrogen storage

    Seong-Hoon Jang, Di Zhang, Hung Ba Tran, Xue Jia, Kiyoe Konno, Ryuhei Sato, Shin-ichi Orimo, Hao Li

    Chemical Science　2025

    Publisher: arXiv

    DOI： 10.1039/D5SC07296D 　

    ISSN： 2041-6520 2041-6539

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    Designing metal hydrides for hydrogen storage remains a longstanding challenge due to the vast compositional space and complex structure-property relationships. Herein, for the first time, we present physically interpretable models for predicting two key performance metrics, gravimetric hydrogen density $w$ and equilibrium pressure $P_{\rm eq,RT}$ at room temperature, based on a minimal set of chemically meaningful descriptors. Using a rigorously curated dataset of $5,089$ metal hydride compositions from our recently developed Digital Hydrogen Platform (\it{DigHyd}) based on large-scale data mining from available experimental literature of solid-state hydrogen storage materials, we systematically constructed over $1.6$ million candidate models using combinations of scalar transformations and nonlinear link functions. The final closed-form models, derived from $2$-$3$ descriptors each, achieve predictive accuracies on par with state-of-the-art machine learning methods, while maintaining full physical transparency. Strikingly, descriptor-based design maps generated from these models reveal a fundamental trade-off between $w$ and $P_{\rm eq,RT}$: saline-type hydrides, composed of light electropositive elements, offer high $w$ but low $P_{\rm eq,RT}$, whereas interstitial-type hydrides based on heavier electronegative transition metals show the opposite trend. Notably, Be-based systems, such as Be-Na alloys, emerge as rare candidates that simultaneously satisfy both performance metrics, attributed to the unique combination of light mass and high molar density for Be. Our models indicate that Be-based systems may offer renewed prospects for approaching these benchmarks. These results provide chemically intuitive guidelines for materials design and establish a scalable framework for the rational discovery of materials in complex chemical spaces.

  7. Predicting Room‐Temperature Conductivity of Na‐Ion Super Ionic Conductors with the Minimal Number of Easily‐Accessible Descriptors Peer-reviewed

    Seong‐Hoon Jang, Randy Jalem, Yoshitaka Tateyama

    Advanced Energy and Sustainability Research　2024/12

    DOI： 10.1002/aesr.202400158 　

  8. Proton Intercalation into an Open‐Tunnel Bronze Phase with Near‐Zero Volume Change Peer-reviewed

    Kosuke Kawai, Seong‐Hoon Jang, Yuta Igarashi, Koji Yazawa, Kazuma Gotoh, Jun Kikkawa, Atsuo Yamada, Yoshitaka Tateyama, Masashi Okubo

    Angewandte Chemie　2024/10/26

    DOI： 10.1002/ange.202410971 　

    ISSN： 0044-8249 1521-3757

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    <jats:title>Abstract</jats:title><jats:p>Managing safety and supply‐chain risks associated with lithium‐ion batteries (LIBs) is an urgent task for sustainable development. Aqueous proton batteries are attractive alternatives to LIBs because using water and protons addresses these two risks. However, most host materials undergo large volume changes upon H<jats:sup>+</jats:sup> intercalation, which induces intraparticle cracking to accelerates parasitic reactions. Herein, we report that Mo<jats:sub>3</jats:sub>Nb<jats:sub>2</jats:sub>O<jats:sub>14</jats:sub> bronze exhibits reversible H<jats:sup>+</jats:sup> intercalation (200 mAh g<jats:sup>−1</jats:sup>) with a Coulombic efficiency of 99.7 % owing to near‐zero volume change and solid‐solution‐type phase transition. Combination of experimental and theoretical analyses clarifies that rotation and shrinkage of open tunnels, which consist of flexible corner‐sharing Mo/NbO<jats:sub><jats:italic>n</jats:italic></jats:sub> polyhedra, relieve local structural distortions upon H<jats:sup>+</jats:sup> intercalation to suppress intraparticle cracking. The prototype full cell of an aqueous proton battery with a Mo<jats:sub>3</jats:sub>Nb<jats:sub>2</jats:sub>O<jats:sub>14</jats:sub> anode operates stably over 1000 charge/discharge cycles. This study reveals the importance of implementing distortion‐relieving voids in host materials to reduce volume change upon charge/discharge.</jats:p>

  9. Proton Intercalation into an Open‐Tunnel Bronze Phase with Near‐Zero Volume Change

    Kosuke Kawai, Seong‐Hoon Jang, Yuta Igarashi, Koji Yazawa, Kazuma Gotoh, Jun Kikkawa, Atsuo Yamada, Yoshitaka Tateyama, Masashi Okubo

    Angewandte Chemie International Edition　2024/10/25

    Publisher: Wiley

    DOI： 10.1002/anie.202410971 　

    ISSN： 1433-7851

    eISSN： 1521-3773

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    Abstract Managing safety and supply‐chain risks associated with lithium‐ion batteries (LIBs) is an urgent task for sustainable development. Aqueous proton batteries are attractive alternatives to LIBs because using water and protons addresses these two risks. However, most host materials undergo large volume changes upon H+ intercalation, which induces intraparticle cracking to accelerates parasitic reactions. Herein, we report that Mo3Nb2O14 bronze exhibits reversible H+ intercalation (200 mAh g−1) with a Coulombic efficiency of 99.7 % owing to near‐zero volume change and solid‐solution‐type phase transition. Combination of experimental and theoretical analyses clarifies that rotation and shrinkage of open tunnels, which consist of flexible corner‐sharing Mo/NbOn polyhedra, relieve local structural distortions upon H+ intercalation to suppress intraparticle cracking. The prototype full cell of an aqueous proton battery with a Mo3Nb2O14 anode operates stably over 1000 charge/discharge cycles. This study reveals the importance of implementing distortion‐relieving voids in host materials to reduce volume change upon charge/discharge.

  10. Exchange interactions in the rare-earth magnets A2PrO3 (A=alkali metals) Peer-reviewed

    Seong-Hoon Jang, Yukitoshi Motome

    Physical Review B　2024/10/10

    DOI： 10.1103/PhysRevB.110.155124 　

  11. Exploring rare-earth Kitaev magnets by massive-scale computational analysis Peer-reviewed

    Seong-Hoon Jang, Yukitoshi Motome

    Communications Materials　2024/09/18

    DOI： 10.1038/s43246-024-00634-w 　

  12. Computational discovery of stable Na-ion sulfide solid electrolytes with high conductivity at room temperature Peer-reviewed

    Seong-Hoon Jang, Randy Jalem, Yoshitaka Tateyama

    Journal of Materials Chemistry A　2024

    DOI： 10.1039/D4TA02522A 　

  13. Metallic ruthenium ilmenites: First-principles study of MgRuO3 and CdRuO3 Peer-reviewed

    Jang, S.-H., Motome, Y.

    AIP Advances　14　(1)　2024/01/01

    DOI： 10.1063/5.0185801 　

    ISSN： 2158-3226

  14. Multiobjective Solid Electrolyte Design of Tetragonal and Cubic Inverse-Perovskites for All-Solid-State Lithium-Ion Batteries by High-Throughput Density Functional Theory Calculations and AI-Driven Methods Peer-reviewed

    Jalem, R., Tateyama, Y., Takada, K., Jang, S.-H.

    Journal of Physical Chemistry C　127　(35)　2023/09/07

    DOI： 10.1021/acs.jpcc.3c02801 　

    ISSN： 1932-7455 1932-7447

  15. EwaldSolidSolution: A High-Throughput Application to Quickly Sample Stable Site Arrangements for Ionic Solid Solutions Peer-reviewed

    Jang, S.-H., Jalem, R., Tateyama, Y.

    Journal of Physical Chemistry A　127　(27)　2023/07/13

    DOI： 10.1021/acs.jpca.3c00076 　

    ISSN： 1520-5215 1089-5639

  16. 3．第一原理計算を基軸とした高イオン伝導度固体電解質のハイスループット探索と記述子抽出 Peer-reviewed

    Yoshitaka TATEYAMA, Seong-Hoon JANG, Randy JALEM

    Denki Kagaku　91　(2)　150-154　2023/06/05

    Publisher: The Electrochemical Society of Japan

    DOI： 10.5796/denkikagaku.23-fe0012 　

    ISSN： 2433-3255

    eISSN： 2433-3263

  17. キタエフスピン液体の物質設計 Invited Peer-reviewed

    Seong-Hoon Jang

    固体物理/アグネ技術センター [編]　57　(11)　613-784　2022/11

  18. High-Throughput Data-Driven Prediction of Stable High-Performance Na-Ion Sulfide Solid Electrolytes Peer-reviewed

    Jang, S.-H., Tateyama, Y., Jalem, R.

    Advanced Functional Materials　32　(48)　2022/11

    DOI： 10.1002/adfm.202206036 　

    ISSN： 1616-3028 1616-301X

  19. Electronic and magnetic properties of iridium ilmenites Peer-reviewed

    Jang, S.-H., Motome, Y.

    Physical Review Materials　5　(10)　2021/10/20

    DOI： 10.1103/PhysRevMaterials.5.104409 　

    ISSN： 2475-9953

  20. Vortex creation and control in the Kitaev spin liquid by local bond modulations Peer-reviewed

    Jang, S.-H., Kato, Y., Motome, Y.

    Physical Review B　104　(8)　2021/08/23

    Publisher: American Physical Society ({APS})

    DOI： 10.1103/PhysRevB.104.085142 　

    ISSN： 2469-9969 2469-9950

  21. Computational design of f -electron Kitaev magnets: Honeycomb and hyperhoneycomb compounds A2PrO3 (A= alkali metals) Peer-reviewed

    Jang, S.-H., Sano, R., Kato, Y., Motome, Y.

    Physical Review Materials　4　(10)　2020/10/30

    Publisher: American Physical Society ({APS})

    DOI： 10.1103/PhysRevMaterials.4.104420 　

    ISSN： 2475-9953

  22. Materials design of Kitaev spin liquids beyond the Jackeli–Khaliullin mechanism Peer-reviewed

    Yukitoshi Motome, Ryoya Sano, Seonghoon Jang, Yusuke Sugita, Yasuyuki Kato

    Journal of Physics: Condensed Matter　32　(40)　404001-404001　2020/06/30

    Publisher: IOP Publishing

    DOI： 10.1088/1361-648x/ab8525 　

    ISSN： 0953-8984

    eISSN： 1361-648X

  23. Antiferromagnetic Kitaev interaction in f-electron based honeycomb magnets Peer-reviewed

    Seong-Hoon Jang, Ryoya Sano, Yasuyuki Kato, Yukitoshi Motome

    Physical Review B　99　(24)　2019/06/10

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.99.241106 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  24. Structural, elastic, and polarization parameters and band structures of wurtzite ZnO and MgO Peer-reviewed

    S.-H. Jang, S. F. Chichibu

    Journal of Applied Physics　112　(7)　2012/10/01

    Publisher: AIP Publishing

    DOI： 10.1063/1.4757023 　

    ISSN： 0021-8979

    eISSN： 1089-7550

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    Ab initio calculations were carried out to predict lattice constants, elastic stiffness constants, spontaneous polarization, piezoelectric constants, and band structure of virtually wurtzite (wz)-MgO. The ground-state properties for both wz-ZnO and wz-MgO were computed using the pseudopotential-planewave method in conjunction with the local density approximation adding the Hubbard parameter to density functional theory. From the results of fitting to reliable in-plane and out-of-plane lattice constants for strain-free and perfectly pseudomorphic wz-MgxZn1−xO alloys, the elastic stiffness constant C33 of the alloy system is revealed to deviate from Vegard's law. The validity of other calculated results for virtually wz-MgO is discussed based on the physical meaning and accuracy, making a comparison with the results shown in previous reports.

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Research Projects 1

  1. Designing Stable and Active TMXA/TMXB Heterostructures for Cost-Effective Electrocatalytic Hydrogen Generation and Utilization

    JANG SEONGHOON

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 研究活動スタート支援

    Institution: 東北大学

    2025/07/31 - 2027/03/31

Academic Activities 3

  1. 査読者：ACS Applied Energy Materials

    Activity type: Peer review

  2. 青年編集委員会メンバー：AI Agent

    Activity type: Scientific advice/Review

  3. Youth Editorial Board member: AI for Materials

    Activity type: Scientific advice/Review