Development of electrochemical hydrogen charge method and exploration of hydride superconductivity
| Project/Area Number |
21K18892
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 29:Applied condensed matter physics and related fields
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
Shimizu Ryota 東京工業大学, 物質理工学院, 准教授 (70611953)
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| Project Period (FY) |
2021-07-09 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2022: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2021: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
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| Keywords | 金属水素化物 / 複合アニオン化合物 / 薄膜物性 / 光機能 / フォトクロミズム / エレクトロクロミズム / 金属絶縁体転移 / 電気化学 / 超伝導 |
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| Outline of Research at the Start |
本研究では、Nb-H系薄膜における「水素透過の整流作用」と「電気化学的水素挿入法」を組合せ、常温・常圧環境において高圧相金属水素化物を安定化し、高密度水素に由来する超伝導発現を目指すものである。超伝導はエネルギー問題や量子コンピュータの観点で注目を集めており、新物質探索と超伝導転移温度の上昇を通じた社会へのインパクトをもくろむ。
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| Outline of Final Research Achievements |
We aimed to explore superconductivity by electrochemically adding high-density hydrogen, which is not achieved at ambient pressure, using Nb hydride as an electrode for hydrogen evolution in water electrolysis. However, the superconducting phase did not appear.
In contrast, we found attractive properties in multi-anion hydrides: In yttrium oxyhydride, which exhibits metal-insulator transition by ultraviolet light, we found a fast metal-insulator switching by electrochemical hydrogen insertion/desertion. In the titanium nitrogen-hydrogen compound, we observed a decrease in electrical resistivity by two orders of magnitude, which recovered to the original state immediately after the field cut. In the future, we aim to discover new electronic phases by cooling under an applied electric field.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では、電気化学的水素チャージ法による金属水素化物の物性変調を目指し、特に光誘起金属化の観測に成功したイットリウム酸水素化物において、固体内水素の脱挿入による光学・電気特性変調に成功した。光・電場という複合的な外場が利用できること、従来数週間かかっていた緩和過程を10秒以内という5桁以上の高速なスイッチングを実現したことから、今後さらに全固体化できれば応用の可能性が拡大することが期待される成果である。
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Report
(3 results)
Research Products
(12 results)
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[Journal Article] Repeatable Photoinduced Insulator-to-Metal Transition in Yttrium Oxyhydride Epitaxial Thin Films2022
Author(s)
Y. Komatsu, Ryota Shimizu, R. Sato, M. Wilde, K. Nishio, T. Katase, D. Matsumura, H. Saitoh, M. Miyauchi, J. R. Adelman, R. M. L. McFadden, D. Fujimoto, J. O. Ticknor, M. Stachura, I. McKenzie, G. D. Morris, W. A. MacFarlane, J. Sugiyama, K. Fukutani, S. Tsuneyuki, T. Hitosugi
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Journal Title
Chemistry of Materials
Volume: 34
Issue: 8
Pages: 3616-3623
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] Thermal motion of hydrogen observed in photoinduced YOxHy thin films2022
Author(s)
oY. Komatsu, R. Shimizu, T. Hitosugi, R. Sato, S. Tsuneyuki, M. Wilde, K. Fukutani, H. Saitoh, D. Matsumura, J. O. Ticknor, D. Fujimoto, J. R. Adelman, R. M. L. McFadden, I. McKenzie, M. Stachura, G. D. Morris, W. A. MacFarlane, J. Sugiyama
Organizer
MuSR2020
Related Report
Int'l Joint Research
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[Presentation] Photo-induced hydrogen diffusion in yttrium oxy-hydride epitaxial thin films2021
Author(s)
Yuya Komatsu, Jun Sugiyama, Ryota Shimizu, Kazunori Nishio, Masahiro Miyauchi, Markus Wilde, Katsuyuki Fukutani, Ryan McFadden, Martin Dehn, Victoria Karner, Derek Fujimoto, John Ticknor, Aris Chatzichristos, Monika Stachura, David Cortie, Gerald Morris, Dr. Iain McKenzie, W MacFarlane, Taro Hitosugi
Organizer
Pacifichem2021
Related Report
Int'l Joint Research
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