熟成誘発の埋め込みによって形成された超安定した酸素進化電解剤
Wenjuan Shi1, Tonghao Shen2, Chengkun Xing1
1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, China.
まとめ
新しい方法は,イリジウム触媒をセリウム酸化物に埋め込み,陽子交換膜水電解剤 (PEMWE) の安定性と効率を向上させます. 耐久性のある低負荷の酸素進化触媒で テラワット規模の水素生産をサポートします
科学分野:
- 材料科学
- 電気化学
- カタリシス
背景:
- 陽子交換膜水電解剤 (PEMWE) 技術は,テラワット規模の展開のために効率的で安定し,費用対効果の高い酸素進化触媒を必要とします.
- イリジウム (Ir) 触媒は,活性であるが,溶解,再配置,分離,および集積により安定性が低下する.
研究 の 目的:
- PEMWEにおける酸素進化反応のためのイリジウム触媒の安定化のための新しい戦略を開発する.
- PEMWEの長期的な耐久性と効率を,触媒支援技術によって改善する.
主な方法:
- イリジウム触媒ナノ粒子をセリウム酸化物支柱内に固定するために,熟成誘発の埋め込み戦略が採用された.
- 合成メカニズムを分析するために,冷凍電子トモグラフィーと全原子運動モンテカルロシミュレーションが使用されました.
- 加速老化試験 (6000時間) を実施し,触媒の安定性と性能を評価した.
主要な成果:
- 埋め込み戦略は イリジウム種を安定させ 退廃を防ぎました
- 合成した触媒は,高い性能 (1.72Vで3A/cm2) とともに,低いIr負荷 (0.3 mg/cm2) を達成した.
- 特殊な長期安定性は,電圧の劣化率1. 33μV/hで実証された.
結論:
- 有効な触媒の埋め込みには,超音波によるサポート成長とIr核化の同期が不可欠です.
- 開発された組み込みのIr触媒は,将来のPEMWEシステムにおける安定的かつ効率的な酸素進化のための有望な解決策を提供します.
- このアプローチは,大規模なグリーン水素生産に不可欠な費用対効果の高い耐久性のある触媒の道を開きます.
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