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100°C以上での高陽子伝導は,ランタニド金属有機構造体内の水素結合によって媒介されます
Qun Tang1, Yiwei Liu, Shuxia Liu
1Key Laboratory of Polyoxometalate Science of the Ministry of Education, College of Chemistry, Northeast Normal University , Changchun, Jilin 130024, China.
Journal of the American Chemical Society
|August 20, 2014
まとめ
この研究では,ランタナイド金属有機フレームワーク (MOF) が150°Cまでの高プロトン伝導性を示すことが明らかになりました. この材料は,再水分化の後にその構造と伝導性を維持し,高度な応用の可能性を示しています.
科学分野:
- マテリアルサイエンス 材料科学
- 無機化学 無機化学とは
- 固体化学 固体化学
背景:
- 材料における陽子伝導は,燃料電池のようなエネルギーアプリケーションにおいて極めて重要です.
- メタル・オーガニック・フレームワーク (MOF) は,イオン輸送のための調整可能な構造を提供します.
- ランタニド基のMOFは,陽子伝導特性についてはあまり研究されていない.
研究 の 目的:
- 陽子伝導のための新しいランタナイドMOFを合成し,特徴づけること.
- 陽子輸送のメカニズムと温度依存性を調査する.
- 材料の安定性と再水分化の能力を評価する.
主な方法:
- ランタニドMOFの水熱合成, [Eu2 (((CO3) (((ox)) 2 (((H2O)) 2) ·4H2O. ランタニドMOFの水熱合成, [Eu2 (((CO3) (((ox)) 2 (((H2O)) 2) ·4H2O.
- 構造的決定のための単結晶X線 difraktion.
- 変数温度伝導度測定 (デュテラートサンプルを含む) と光発光研究.
主要な成果:
- MOFは高温 (150 °C) で有意な陽子伝導率 (最大2.08 × 10−3 S cm−1) を示した.
- 陽子輸送は湿度に依存せず,主に水素結合アクアリガンドとオキシラート基を介して結晶学a軸に沿って行われることが確認されました.
- アクアリガンドの喪失により,導電性は160°C以上で低下したが,MOFの構造は350°Cまで安定し,再水分化により回復可能であった.
結論:
- 合成されたランタニドMOFは,活性化されたアクアリガンドによって駆動される優れた陽子伝導性を示す.
- この材料は,驚くべき熱安定性と,再水分化後の反転性陽子伝導性を示しています.
- このMOFは,高温プロトン伝導用アプリケーションに有望な候補である.
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