Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (6): 1485-1492.DOI: 10.1016/S1872-2067(21)64004-4

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Surface chlorine doped perovskite-type cobaltate lanthanum for water oxidation

Wei Shena,, Jing Jina,, Yang Hua, Yichao Houa, Jie Yina, Zhenhui Mab, Yong-Qing Zhaoa, Pinxian Xia,*()   

  1. aState Key Laboratory of Applied Organic Chemistry, Frontiers Science Center for Rare Isotopes, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, China
    bDepartment of Physics, Beijing Technology and Business University, Beijing 100048, China
  • Received:2021-11-13 Accepted:2021-11-13 Online:2022-06-18 Published:2022-04-14
  • Contact: Pinxian Xi
  • About author:First author contact:

    作者简介: Contributed equally to this work.

  • Supported by:
    National Natural Science Foundation of China(21931001);National Natural Science Foundation of China(21922105);National Natural Science Foundation of China(51771085);National Natural Science Foundation of China(51801088);Special Fund Project of Guiding Scientific and Technological Innovation Development of Gansu Province(2019ZX-04);111 Project(B20027);Fundamental Research Funds for the Central Universities(lzujbky-2021-pd04);Fundamental Research Funds for the Central Universities(lzujbky-2021-it12);Fundamental Research Funds for the Central Universities(lzujbky-2021-37);China Postdoctoral Science Foundation(2021M691375);China National Postdoctoral Program for Innovative Talents(BX20200157)

Abstract:

Rationally manipulating the in-situ formed catalytically active surface of catalysts remains a great challenge for a highly efficient water electrolysis. Here, we report a cationic oxidation method which can adjust the leaching of the in-situ catalyst and promote the reconstruction of dynamic surface for the oxygen evolution reaction (OER). The chlorine doping can reduce the possibility of triggering in-situ cobalt oxidation and chlorine leaching, leading to a transformation of the surface chlorine doped LaCoO3 (Cl-LaCoO3) into an intricate amorphous (oxygen) hydroxide phase. And thus, Cl-LaCoO3 nanocrystals shows an ultralow overpotential of 342 mV at the current density of 10 mA cm -2 and Tafel slope of 76.2 mV dec-1. Surface reconstructed Cl-LaCoO3 is better than many of the most advanced OER catalysts and has proven significant stability. This work provides a new prospect for designing a high-efficiency electrocatalyst with optimized perovskite-structure in renewable energy system.

Key words: Surface reconstruction, LaCoO3, Chlorine doped, Hollow cube, Oxygen evolution reaction