陽子交換膜電解のためのLaとMnドーピングコバルトスピネル酸素進化触媒
Lina Chong1, Guoping Gao2, Jianguo Wen3
1Chemical Science and Engineering Division, Argonne National Laboratory, Lemont, IL 60439, USA.
Science (New York, N.Y.)
|May 11, 2023
まとめ
研究者らは,水電解剤における酸素進化反応 (OER) のための新しいコバルトスピネル触媒を開発した. 地球に豊富に存在するこの触媒は 優れた性能と耐久性を示し より安価なグリーン水素生産の道を開いています
科学分野:
- 材料科学
- 電気化学
- グリーンエネルギー
背景:
- イリジウムベースの触媒は,陽子交換膜水電解剤 (PEMWE) の酸素進化反応 (OER) に高価である.
- 費用対効果の高いグリーン水素の生産には 地球に豊富な代替品の開発が不可欠です
研究 の 目的:
- PEMWEでOERのための新しいナノ繊維コバルトスピネル触媒を合成し評価する.
- イリジウムの代替品として,触媒の性能と耐久性を評価する.
主な方法:
- ゼオリチウムイミダゾラートフレームワークと電解ポリマー繊維を用いてランタンとマンガンでコープされたナノ繊維コバルトスピネル触媒の製造.
- 酸性電解質でのOERの触媒の電気化学試験
- 性能評価のためのプロトン交換膜水電解剤 (PEMWE) に触媒を統合する.
主要な成果:
- 触媒はOERで10mA/cm2で353mVの低い過剰電位を示した.
- 酸性環境で360時間以上安定したOER性能を示した.
- 触媒を使ったPEMWE装置は,低劣化で高い電流密度 (2.47Vで2000mA/cm2,3.00Vで4000mA/cm2) を達成した.
結論:
- La-とMn-コドプされたコバルトスピネルナノファイバー触媒は,PEMWEにおけるOERのためのイリジウムに対する有望な地球豊富な代替品です.
- この触媒は,低コストのグリーン水素生産の可能性を大幅に高めています.
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