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完全に水素化された六角形ペロブスキート関連酸化物の八面体層における高プロトン伝導
Kohei Matsuzaki1, Kei Saito1, Yoichi Ikeda2
1Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, Tokyo 152-8551, Japan.
Journal of the American Chemical Society
|June 25, 2024
まとめ
新しい六角形ペロブスキート関連酸化物は高プロトン伝導性と化学的安定性を示しています. これらの材料は 燃料電池やセンサーには 独特の構造と水分補給特性により 有望です
科学分野:
- 材料科学
- 固体化学
- 電気化学
背景:
- 燃料電池,電解電池,センサーなどの エネルギー利用に不可欠です
- 現存する材料には,中間温度で十分な陽子伝導性と化学的安定性が欠けていることが多い.
- これらの技術の進歩には,新型陽子伝導材料の開発が不可欠です.
研究 の 目的:
- 六角形ペロブスキート関連酸化物,Ba5RE2Al2SnO13 (RE=Gd,Dy,Ho,Y,Er,Tm,Yb) の新シリーズを合成し,特徴づけること.
- これらの新材料の陽子伝導性と化学的安定性を評価する.
- 物質構造,水分化,陽子輸送の性質の関係を理解する.
主な方法:
- 六角性ペロブスキート関連酸化物の合成
- 構造と水分化特性を決定するために,ニュートロン difraktionと熱重力測定分析.
- 陽子の伝導性と化学的安定性を評価するために,様々な大気条件下での電気伝導性の測定.
主要な成果:
- Ba5Er2Al2SnO13はドーピングなしで高プロトン伝導性 (0.01 S cm−1 °C) を示した.
- 高陽子伝導性は,高陽子濃度 (完全な水分と酸素の空白) と八面体層での急速な陽子移動に起因する.
- Ba5Er2Al2SnO13は,湿ったO2,空気,H2およびCO2の大気に優れた化学的安定性を示した.
結論:
- Ba5Er2Al2SnO13は,高い伝導性と安定性のために優れた陽子伝導体として識別されます.
- 六角性ペロブスキート関連酸化物 (Ba5RE2Al2SnO13) のシリーズは,高プロトン伝導性を示す可能性がある.
- 効率的な水分と陽子移動を伴う酸素欠乏性の高い六角ペロブスキート関連材料の開発は,次世代の陽子導体にとって有望な戦略です.
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