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Ba5Er2Al2ZrO13における高プロトン伝導度,本質的に酸素不足の層を持つ六角性ペロブスキート関連酸化物
Taito Murakami1, James R Hester2, Masatomo Yashima1
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
|May 16, 2020
まとめ
新しい六角形ペロブスキート関連酸化物であるBa5Er2Al2ZrO13は,優れた陽子伝導性を示しています. この発見により,新型の陽子伝導体が エネルギー利用の道を開きます.
科学分野:
- 材料科学
- 固体化学
- 電気化学
背景:
- 燃料電池のような電気化学装置には 陽子の伝導性が不可欠です
- 既存の陽子伝導体は,立方ペロフスキットなどの特定の構造家族に限定されています.
- 中間の温度 (300~600°C) で高プロトン伝導性が求められる.
研究 の 目的:
- 陽子伝導体の新種を特定し特徴づけること
- 陽子伝導性を高めるために六角ペロブスキート関連酸化物を探求する.
- 新しい物質における 陽子輸送の仕組みを理解する
主な方法:
- Ba5Er2Al2ZrO13の合成と特徴づけ
- リートヴェルド分析によるニュートロン difraktion.
- ボンド・バレンスのエネルギー計算
- 熱重量測定法 (TGA)
主要な成果:
- Ba5Er2Al2ZrO13は,六角形のペロブスキート関連酸化物を合成した.
- 300°Cから1200°Cの間には10^-3 S cm^-1を超える陽子伝導性が観測された.
- ニュートロン difraktionと計算は酸素不足のh'層に陽子の組み込みを確認しました.
結論:
- Ba5Er2Al2ZrO13は,陽子伝導体の新しい構造ファミリーを表しています.
- 固有の酸素不足の h' 層は,陽子輸送の鍵です.
- この発見は,六角形のペロブスキート関連酸化物を基にした先進的な陽子伝導体の設計のための戦略を提供します.
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