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通过非传统的无形氧化物的两步结构重构来克服电催化剂的活性稳定性权衡

Guichen Gao¹, Guangshe Li¹, Taotao Huang¹

¹State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China.

Journal of the American Chemical Society

|August 5, 2025

概括

这项研究揭示了W-doped Co-Fe无形氧化物如何重建以激活网状氧气以实现高效的氧气演化反应. 由此产生的γ层双 (LDH) 结构增强了水电解剂的催化活性和稳定性.

科学领域:

材料科学
电化学
催化剂

背景情况:

通过结构重建激活氧是氧化解氧系统中氧化催化剂的关键.
了解前电化学重建转换及其对结构不均性的影响对于氧气进化反应至关重要.

研究的目的:

在电化学氧化过程中研究W-doped Co-Fe无形氧化物的结构变化和晶格氧化激活.
阐明结构不均质,化学状态演变和催化性能之间的关系.

主要方法:

自发和电化学的大量重建 W-doped Co-Fe无形氧化物.
现场光谱技术 (例如,X射线吸收光谱,拉曼光谱) 用于监测变化.
电化学测量以评估催化性能和稳定性

主要成果:

重建产生具有局部结构异质性的活性 γ 层双 (LDH).
重建的催化剂形成反应性非结合氧态,使CO3+催化O2进化.
在离子交换膜水电解器中,在1 A cm-2时达到1.69 V的电池电压,稳定性为600 h.

结论:

这项研究为电催化剂的潜在依赖性机械转换提供了第一个实验证据.
深入了解结构-性能关系以及化学状态演变在催化中的作用.
强调控制结构重建对于先进的电催化剂设计的重要性.

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