Chinese Journal of Catalysis ›› 2020, Vol. 41 ›› Issue (4): 592-597.DOI: 10.1016/S1872-2067(19)63441-8

• Special Column for the Youth Innovation Promotion Association, Chinese Academy of Sciences • Previous Articles     Next Articles

Understanding the origin of high oxygen evolution reaction activity in the high Sr-doped perovskite

Sanzhao Songa, Jing Zhoua,c, Jian Suna,b, Shiyu Zhanga,b, Xiao Lina,c, Zhiwei Hud, Jun Hua,b, Linjuan Zhanga,b,c, Jian-Qiang Wanga,b,c   

  1. a Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China;
    c Dalian National Laboratory for Clean Energy, Dalian 116023, Liaoning, China;
    d Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, Dresden 01187, Germany
  • Received:2019-10-07 Revised:2019-11-03 Online:2020-04-18 Published:2019-12-12
  • Supported by:
    This work was supported by the "Transformational Technologies for clean Energy and Demonstration", Strategic Priority Research Program of the Chinese Academy of Sciences (XDA2100000), the Youth Innovation Promotion Association, Chinese Academy of Sciences (2014237), the National Natural Science Foundation of China (21876183), and the Scientific Instrument Developing Project of the Chinese Academy of Sciences (YJKYYQ20180066).

Abstract: Effective electrocatalysis is crucial for enhancing the efficiency of water splitting to obtain clean fuels. Herein, we report a system of interesting and high-performance Sr-doped perovskite electrocatalysts with porous structures, obtained via a facile molten salt method and applied in the oxygen evolution reaction (OER). With increasing the Sr content, the valence states of Co and Fe ions do not clearly increase, according to the Co-L2,3 and Fe-L2,3 as well as the Co-K and the Fe-K X-ray absorption spectroscopy, whereas doped holes are clearly observed in the O-K edge. High-resolution transmission electron microscopy indicates the appearance of an amorphous layer after the electrochemical reaction. We conclude that the formation of the amorphous layer at the surface, induced by Sr doping, is crucial for achieving high OER activity, and we offer insights into the self-reconstruction of the OER catalyst.

 

Key words: Molten salt, Perovskite, Oxygen evolution reaction, Surface reconstruction, Oxygen hole

CLC Number: