活性和稳定的层状化物有效催化低IR质子交换膜 (PEM) 水电解剂中的氧气电演变
Jiaqi Kang1, Sebastian Möhle1, Xingli Wang1
1Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany.
Journal of the American Chemical Society
|December 1, 2025
概括
新的酸离子间隔 iridates 为质子交换膜水电解剂 (PEMWEs) 提供了更好的氧化演化反应 (OER) 活性和稳定性. 这些催化剂显著降低了对的需求,而Cs- 酸盐显示出更强的长期耐用性.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 开发高效和稳定的催化剂对于促进质子交换膜水电解剂 (PEMWE) 的氧化演化反应 (OER) 是至关重要的.
- 目前最先进的催化剂,如鲁IrO2和无形IrOx,在活性和长期稳定性方面面临限制.
- 减少对贵金属的需求是一个关键的技术优先事项.
研究的目的:
- 调查酸间隔性 iridates 的结构-OER 活性-稳定性关系.
- 揭示结构演变,特别是边缘共享与角共享 [IrO6] 八面体图案的比例,如何影响催化性能.
- 确定超越现有催化剂并减少利用的新型催化剂.
主要方法:
- 一个离子间隔性 iridates 的家族的合成和特征.
- 评估PEMWE的催化性能,重点关注广泛的电流范围内的活性和稳定性.
- 结构特征的相关性,特别是八面形连接性,与OER性能.
主要成果:
- 在 iridate 族中观察到从荷兰石到层状结构的结构演变.
- Li-IrOx和Cs-IrOx表现出很好的PEMWE性能,达到0.06gIr kW-1的功率特定需求.
- 与Li-IrOx相比,Cs-IrOx表现出更高的长期稳定性,与更高比例的边缘共享动机有关.
结论:
- 性阴离子间隔 iridates 提供一个可行的替代品,以目前的OER催化剂在PEMWEs.
- 调节原子尺度模式连接提供了一种平衡催化活性和稳定的策略.
- 具有增加边缘共享八面体连接的虹膜呈现出增强的结构强度,为更耐用和高效的水电解铺平了道路.
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