アルカリ燃料電池のORR電解剤として原子分散Zn/Co-N-C
Weixuan Xu1, Rui Zeng1, Michael Rebarchik2
1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States.
Journal of the American Chemical Society
|January 18, 2024
まとめ
研究者らは,水素燃料電池のための高度な二重金属単原子触媒 (SAC) を開発しました. これらの非貴重なZn/Co-N-C触媒は,酸素還元反応 (ORR) の高い活性と耐久性を示し,燃料電池の性能を向上させます.
科学分野:
- 材料科学
- 電気化学
- カタリシス
背景:
- 水素燃料電池は持続可能なエネルギーにとって不可欠ですが,酸素還元反応 (ORR) には効率的な電気触媒が必要です.
- 燃料電池技術の進歩には,低コストで耐久性があり,高性能の非貴金属触媒の開発が不可欠です.
研究 の 目的:
- 改善されたORR運動のための新しい金属-有機フレームワーク派生型二重金属単原子触媒 (SAC) の設計と合成.
- アルカリ燃料電池のZn/Co-N-C SACの触媒機構を調査し,活性部位を特定する.
主な方法:
- 金属有機基板由来Zn/Co-N-C単原子触媒の合成
- 半波電位と安定性試験を含む電気化学的特徴付け
- 機械学的洞察のためのX線吸収スペクトロスコーピーと理論的計算 (マイクロキネティックモデリング,コアレベルシフト) を操作する.
主要な成果:
- Zn/Co-N-C SACは,優れたORR活性 (E1/2 = 0.938V対RHE) と優れた安定性 (ΔE1/2 = 50kサイクル後に - 8. 5mV) を示した.
- アルカリ燃料電池で ~ 1 W cm−2 の記録的なピーク電力密度を達成しました.
- 主要な活性部位としてCo-N4を特定し,ORR中に酸素結合によりOads-Co-N4分子を形成し,実験的および理論的データによって支持された.
結論:
- この研究は,ORRのための高性能,非貴金属二重単原子触媒を提示しています.
- 活性サイトと触媒過程の包括的なメカニズムを理解します.
- 燃料電池やその他のエネルギー用途のための先進的な単一サイト電気触媒の設計のための道を切り開きます.
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