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タイトル: | Anion ordering enables fast H¯ conduction at low temperatures |
著者: | Ubukata, Hiroki Takeiri, Fumitaka Shitara, Kazuki Tassel, Cédric https://orcid.org/0000-0002-8867-4813 (unconfirmed) Saito, Takashi Kamiyama, Takashi Broux, Thibault Kuwabara, Akihide Kobayashi, Genki Kageyama, Hiroshi |
著者名の別形: | 生方, 宏樹 竹入, 史隆 設樂, 一希 タッセル, セドリック 齊藤, 高志 神山, 崇 桑原, 彰秀 小林, 玄器 陰山, 洋 |
発行日: | Jun-2021 |
出版者: | American Association for the Advancement of Science (AAAS) |
誌名: | Science Advances |
巻: | 7 |
号: | 23 |
論文番号: | eabf7883 |
抄録: | The introduction of chemical disorder by substitutional chemistry into ionic conductors is the most commonly used strategy to stabilize high-symmetric phases while maintaining ionic conductivity at lower temperatures. In recent years, hydride materials have received much attention owing to their potential for new energy applications, but there remains room for development in ionic conductivity below 300°C. Here, we show that layered anion-ordered Ba2−δH3−2δX (X = Cl, Br, and I) exhibit a remarkable conductivity, reaching 1 mS cm⁻¹ at 200°C, with low activation barriers allowing H⁻ conduction even at room temperature. In contrast to structurally related BaH2 (i.e., Ba2H4), the layered anion order in Ba2−δH3−2δX, along with Schottky defects, likely suppresses a structural transition, rather than the traditional chemical disorder, while retaining a highly symmetric hexagonal lattice. This discovery could open a new direction in electrochemical use of hydrogen in synthetic processes and energy devices. |
記述: | H¯イオンの低温高速伝導を実現. 京都大学プレスリリース. 2021-06-03. Bringing order to hydrogen energy devices. 京都大学プレスリリース. 2021-06-03. |
著作権等: | Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. |
URI: | http://hdl.handle.net/2433/263211 |
DOI(出版社版): | 10.1126/sciadv.abf7883 |
PubMed ID: | 34078603 |
関連リンク: | https://www.icems.kyoto-u.ac.jp/news/4186/ https://www.icems.kyoto-u.ac.jp/en/news/4172/ |
出現コレクション: | 学術雑誌掲載論文等 |
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