Zhu Kaiyue, Zhu Xuefeng, Yang Weishen
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457# Zhongshan Road, Dalian, 116023, Liaoning, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Angew Chem Int Ed Engl. 2019 Jan 28;58(5):1252-1265. doi: 10.1002/anie.201802923. Epub 2018 Nov 8.
Developing high-efficiency and affordable electrocatalysts for the sluggish oxygen evolution reaction (OER) remains a crucial bottleneck on the way to the practical applications of rechargeable energy storage technologies and water splitting for producing clean fuel (H ). In recent years, NiFe-based materials have proven to be excellent electrocatalysts for OER. Understanding the characteristics that affect OER activity and determining the OER mechanism are of vital importance for the development of OER electrocatalysts. Therefore, in situ characterization techniques performed under OER conditions are urgently needed to monitor the key intermediates together with identifying the OER active centers and phases. In this Minireview, recent advances regarding in situ techniques for the characterization of NiFe-based electrocatalysts are thoroughly summarized, including Raman spectroscopy, X-ray absorption spectroscopy, ambient pressure X-ray photoelectron spectroscopy, Mössbauer spectroscopy, Ultraviolet-visible spectroscopy, differential electrochemical mass spectrometry, and surface interrogation scanning electrochemical microscopy. The results from these in situ measurements not only reveal the structural transformation and the progressive oxidation of the catalytic species under OER conditions, but also disclose the crucial role of Ni and Fe during the OER. Finally, the need for developing new in situ techniques and theoretical investigations is discussed to better understand the OER mechanism and design promising OER electrocatalysts.
开发用于缓慢析氧反应（OER）的高效且经济实惠的电催化剂，仍然是可充电储能技术和用于生产清洁燃料（H₂）的水分解实际应用道路上的关键瓶颈。近年来，基于镍铁的材料已被证明是用于OER的优异电催化剂。了解影响OER活性的特性并确定OER机理对于OER电催化剂的开发至关重要。因此，迫切需要在OER条件下进行原位表征技术，以监测关键中间体，同时识别OER活性中心和相。在本综述中，全面总结了用于表征镍铁基电催化剂的原位技术的最新进展，包括拉曼光谱、X射线吸收光谱、常压X射线光电子能谱、穆斯堡尔光谱、紫外可见光谱、差分电化学质谱和表面询问扫描电化学显微镜。这些原位测量的结果不仅揭示了OER条件下催化物种的结构转变和逐步氧化，还揭示了镍和铁在OER过程中的关键作用。最后，讨论了开发新的原位技术和理论研究的必要性，以更好地理解OER机理并设计有前景的OER电催化剂。
