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单原子兴奋剂诱导氧化转化为氧化,以增强性的进化

Yuanqi Liu¹, Qiang Gao², Lei Shi²

¹Department of Chemical Engineering, University of Virginia, Charlottesville, VA 22903, USA. kkx8js@virginia.edu.

Nanoscale horizons

|June 25, 2025

概括

氧化物 (NiO) 中的单原子兴奋剂提高了演化反应 (HER) 的性能. 这种兴奋剂促进了活性氧化部位的形成,提高了催化效率.

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:

-氧化物 (NiMoO_x) 化合物是用于演化反应 (HER) 的主要非贵金属催化剂.
提高 HER 催化剂的性能和在反应条件下了解它们的结构动态是关键的挑战.

研究的目的:

研究NiO中单原子兴奋剂对HER活性的影响.
用现场技术阐明Mo-doped NiO在HER条件下的结构演变.

主要方法:

在现场的X射线吸收光谱 (XAS).
在现场的拉曼光谱法.
电化学测量演化反应 (HER) 活性.

主要成果:

在NiO中单原子Mo兴奋剂降低了HER超电位在10mA cm-2时到131mV.
在现场研究中,在Mo-doped NiO中,在HER条件下发现了稳定的单个Mo原子和Ni2+转化为NiOH的转化.
这种对加速水分离至关重要的NiO (OH) ₂形成,在未使用剂的NiO中不存在.

结论:

单原子Mo兴奋剂通过促进活性Ni(OH) ₂位点的形成,显著增强NiO的HER活性.
兴奋剂稳定了催化剂结构,同时促进了转化到更活跃的阶段.
在现场表征对于理解催化剂机制和设计改进的 HER 电催化剂至关重要.

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