操作揭示活动起源通过优选的结构演变在Ni-Fe (氧) 化物,以高效的氧气演变
Zhi-Peng Wu1, Shouwei Zuo2, Zhihao Pei1,3
1School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.
Science advances
|March 7, 2025
概括
非贵金属催化剂在氧化演化反应 (OER) 中表现有前途. 这项研究表明,在Ni-Fe化物中现场生成的O-Fe-P结构是它们增强的OER活性的关键.
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:
- 非贵金属基的异原子化合物对氧演化反应 (OER) 具有显著的电催化活性.
- 了解结构-活性关系对于优化这些催化剂至关重要,但由于缺乏有效的in situ/operando表征技术而受到阻碍.
- 尼-铁双金属化物是有前途的OER电催化剂,但它们的反应机制和活性位点的起源需要进一步阐明.
研究的目的:
- 使用先进的操作技术,为OER催化剂建立直接的结构-活动相关性.
- 为了阐明Ni-Fe双金属化物中增强的电催化活性的起源.
- 为下一代OER电催化剂的合理设计提供见解.
主要方法:
- 操作式快速扫描X射线吸收细结构 (Q-XAFS) 光谱.
- 在现场电化学电位控制.
- 理论计算 (例如,DFT).
主要成果:
- 操作Q-XAFS揭示了结构转变始于Fe位点的优选氧化,而不是Ni位点.
- 在现场形成的O-Fe-P结构被确定为增强的OER活动的起源.
- 理论计算证实了实验结果,证实了O-Fe-P结构的作用.
结论:
- 这项研究成功地将催化剂结构演变与OER活性与运算器Q-XAFS.使用相关联.
- 铁的优先氧化和随后的O-Fe-P结构的形成对于Ni-Fe化物中高OER性能至关重要.
- 这些发现促进了对基于Ni-Fe的OER电催化剂的机械学理解,并指导了未来的催化剂设计.
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