高エントロピー合金電触媒の活性と耐久性を相乗的に高める複数の金属窒素結合
Xueru Zhao1, Hao Cheng2, Xiaobo Chen3
1Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973, United States.
Journal of the American Chemical Society
|January 26, 2024
まとめ
この研究は,燃料電池のための新しい窒素ドーピングの高エントロピー合金触媒を導入します. この触媒は酸素還元反応 (ORR) の優れた活性と安定性を示し,商業的な選択肢を上回る.
科学分野:
- 電気化学
- 材料科学
- カタリシス
背景:
- 燃料電池のための効率的で安定したプラチナベースの触媒の開発は重要ですが,挑戦的です.
- 現在の触媒は,活動,耐久性,コストの制限に直面します.
研究 の 目的:
- 酸素還元反応 (ORR) の性能を向上させるため,窒素ドーピングされた高エントロピー合金 (HEA) の新型電気触媒の設計と評価.
- 新しい触媒の構造活動関係と安定性を調べる.
主な方法:
- 炭素基 (N-Pt/HEA/C) に窒素を添加したPt豊富なシェル/PtCoFeNiCuコアのHEA触媒の合成
- 回転ディスク電極 (RDE) と膜電極組 (MEA) を使用した電気化学試験.
- X線吸収スペクトロスコーピー (XAS) と理論的な計算を用いた特徴付け.
主要な成果:
- N-Pt/HEA/C触媒は,ORRで0. 9Vで1. 34A mgPt-1の高質量活性を達成し,Pt/Cや他のPtベースの触媒を大幅に上回った.
- RDEとMEAの両方のテストで優れた安定性を示しました.
- N-ドーピングで最適化された吸着エネルギーと オーダーメイドの電子構造により ORRの活性が向上します
結論:
- N-Pt/HEA/C触媒は,先進的な燃料電池電触媒のための有望な経路を提供します.
- 窒素ドーピングとHEA構造の相乗効果はORRの性能と耐久性を改善します.
- 電子構造と金属-窒素結合の最適化により,触媒活性と耐腐化性が向上する.
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