セミキノイドベースの金属有機フレームワークにおけるアニオンリドックス化学に対する共振性の影響
Michael E Ziebel1,2, Carlo Alberto Gaggioli3, Ari B Turkiewicz1
1Department of Chemistry , University of California , Berkeley , California 94720 , United States.
Journal of the American Chemical Society
|January 16, 2020
まとめ
鉄基の2つの新しい金属有機フレームワークは,電池のための高い電気化学能力を発揮します. これらの材料はリチウムイオン,ナトリウムイオン,およびカリウムイオンエネルギー貯蔵アプリケーションに希望を示しています.
科学分野:
- 材料科学
- 電気化学
- エネルギー貯蔵
背景:
- メタル・オーガニック・フレームワーク (MOF) は,エネルギー貯蔵の用途としてますます探索されています.
- 金属とリガンドの酸化還元作用の相互作用を理解することは,高性能MOF電極の設計に不可欠です.
- バッテリー化学の様々な分野における効率的なカトド材料の開発は,依然として重要な課題です.
研究 の 目的:
- 電気化学的エネルギー貯蔵のための新しい鉄半キノイド構造材料を合成し,特徴づけること.
- 詳細なスペクトル解析と計算分析により,高電化学容量の起源を解明する.
- リチウムイオン,ナトリウムイオン,およびカリウムイオン電池におけるカトド材料としてのこれらのMOFの性能を評価する.
主な方法:
- 2つの鉄半キノイド構造材料の合成: (H2NMe2) 2Fe2 ((Cl2dhbq) 3 (1) と (H2NMe2) 4Fe3 ((Cl2dhbq) 3 ((SO4) 2 (2-SO4)
- サイクルボルトメトリーとガルバノスタティックサイクルを用いた電気化学的特徴付け.
- スペクトル分析 (例えば,モースバウアースペクトル,X線光電子スペクトル) と電子構造計算.
- リチウムイオン,ナトリウムイオン,カリウムイオン電池のプロトタイプの製造と試験.
主要な成果:
- フレームワーク1は,195mAh/gまでの高電化学容量を示し,金属とリガンドを中心としたシネージ的酸化還元プロセスに起因した.
- カトドとしてフレーム1を使用したリチウムイオン装置のプロトタイプは,50サイクルで合理的な容量保持で533Wh/kgのピーク特異エネルギーを達成しました.
- 隔離材料であるフレーム2-SO4は,MOFカトドの電子伝導性の必要性を強調して,容量の急速な衰退を示した.
- フレーム1は,ナトリウムイオン電池とカリウムイオン電池のカソッドとして同様の容量を示した.
結論:
- 金属とリガンドの軌道間のエネルギーアライナメントは,MOF電極で高電位で高容量を達成するために不可欠です.
- 鉄半キノイドMOFは,特にフレームワーク1のような導電性物質は,さまざまなバッテリー化学のための有望なカトド材料です.
- これらの発見は,次世代のエネルギー貯蔵のための多用途で高性能な材料としてのMOFの可能性を強調しています.
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