被杂的IrOx触发了直接的O-O合,以促进酸水氧化电催化
Wuyong Zhang1, Caihan Zhu1, Yingjie Wen1
1Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province, Ningbo Institute of Materials Technology&Engineering, Chinese Academy of Sciences, 1219 West Zhongguan Road, Zhenhai District, Ningbo, 315201, P. R. China.
Angewandte Chemie (International ed. in English)
|October 10, 2024
概括
我们开发了一种新型的氧化 (Sr-IrOx) 催化剂,用于有效的酸氧演化反应. 这种催化剂可实现直接的O-O合,显著提高了质子交换膜水电解器的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 有效和稳定的电催化剂对于商业化质子交换膜水电解器 (PEMWE) 至关重要.
- 由于高能量障碍,酸性条件对氧演化反应 (OER) 催化剂构成挑战.
研究的目的:
- 设计和合成一个具有高度暴露 (200) 面的氧化 (Sr-IrOx) 催化剂.
- 通过降低Ir-O共价性并提供相邻的位,增强酸性水氧化的直接O-O合.
主要方法:
- 使用了氧化 (Sr(OH) 2) 辅助的制造方法.
- 分析了催化剂的结构和电子特性,以了解其催化机制.
- 电化学性能在0.5 M H2SO4中进行了评估,包括超电位和稳定性测试.
- 使用Sr-IrOx催化剂组装了一个质子交换膜水电解器 (PEMWE) 装置.
主要成果:
- Sr-IrOx催化剂在0.5 M H2SO4中在10 mA cm-2时实现了207 mV的超电位.
- 催化剂表现出极好的稳定性,在PEMWE中保持超过500小时的性能.
- Sr-IrOx催化剂促进了直接的O-O合,绕过了高能*OOH中间路径.
结论:
- 通过Sr-OH) 辅助方法制造的Sr-IrOx催化剂,对酸性OER显示出优越的性能.
- 催化剂的设计促进了高效的直接O-O合,这对于水的氧化至关重要.
- 这项工作为开发用于能源应用的基于的先进电催化剂提供了见解.
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