高性能リチウム2電池の空間制限とイオン置換戦略によるN-ドープされた炭素の単一原子
Xiaolin Hu1, Gan Luo1, Qiannan Zhao1
1College of Aerospace Engineering, Chongqing University, Chongqing 400044, China.
Journal of the American Chemical Society
|September 3, 2020
まとめ
研究者は,窒素ドーピングされた炭素のルテニウム単一原子を使用して,リチウム酸素電池 (LOB) のための新しい電気触媒を開発しました. この突破は,過剰電力を減らし,充電/放電の運動性を向上させることで,バッテリーの性能を大幅に改善します.
科学分野:
- 材料科学
- 電気化学
- エネルギー貯蔵
背景:
- 充電可能なリチウム酸素電池 (LOB) は,電気自動車や電子機器にとって大きな希望を示しています.
- ゆっくりとした酸素還元 (ORR) と酸素進化 (OER) の運動は,LOBの発達を妨げます.
研究 の 目的:
- LOB用の高効率の電気触媒を設計し合成する.
- LOBにおけるORRとOERの運動制限を克服する.
主な方法:
- 窒素ドーピングされた多孔性炭素 (Ru SAs-NC) の単一のRu原子をMOF支援の空間収束とイオン置換を用いて合成した.
- 酸素を吸い込む電極の電気触媒として使用されている.
- 電気化学性能を定量化するためにin-situ DEMSを使用しました.
主要な成果:
- LOBsで0.02 mA cm$^{-2}$で0.55 Vの最小の過剰電位を達成しました.
- E$^{-}$/O$_{2}$の比率は2.14で,優れた電気触媒効率を示しています.
- 理論的な計算で Ru-N$_{4}$ が活性センターと特定され,中間の種の親和に影響を与えました.
結論:
- Ru SAs-NC触媒は,ORRとOERの速度制限ステップに対処することによって,LOBのパフォーマンスを大幅に改善します.
- この研究は,LOBの最大原子利用率を持つ高効率のシングルサイト触媒の設計のための新しい戦略を提供します.
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