リチウムアミド/リチウムイミド水素貯蔵反応における非ステイキオメトリーのメカニズム

William I F David¹, Martin O Jones, Duncan H Gregory

¹ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK. bill.david@rl.ac.uk

Journal of the American Chemical Society

|January 25, 2007

まとめ

Li-N-H水素貯蔵におけるリチウムアミドとリチウムイミドの変換は,大量可逆反応である. この非ステイキオメトリックなプロセスは,立方反フッ素のようなLi-N-H構造の中で起こります.

科学分野:

マテリアルサイエンス材料科学
固体化学固体化学
水素貯蔵庫で水素を貯蔵する

背景:

リチウムアミド (LiNH2) とリチウムイミド (Li2NH) は,水素貯蔵のためのLi-N-Hシステムの主要成分です.
これらの相間の変換メカニズムを理解することは,水素貯蔵容量と運動を最適化するために不可欠です.

研究の目的:

リチウムアミドとリチウムイミドのリバーシブル変換の構造的メカニズムの解明,Li-N-Hシステムにおける水素循環中の.
この変換過程における非ステキオメトリーの役割を調査する.

主な方法:

シンクロトロンX線 difraktion (XRD) データを用いた構造的精錬.
立方反フッ化物のようなLi-N-H結晶構造の分析.

主要な成果:

リチウムアミドとリチウムイミドの変換は,大量可逆反応である.
この反応は非ステキオメトリックな方法で進行します.
変換は,確立された立方反フッ素のようなLi-N-H構造の中で起こります.

結論:

Li-N-H水素貯蔵メカニズムは,リチウムアミドとリチウムイミドの間で大量,非ステキオメトリック,可逆反応を伴う.
立方体アンチフッ化物のような構造は,この変換に対応し,水素貯蔵アプリケーションにおけるその重要性を強調しています.

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