Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (3): 482-489.DOI: 10.1016/S1872-2067(20)63663-4

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Facilitating active species by decorating CeO2 on Ni3S2 nanosheets for efficient water oxidation electrocatalysis

Qian Wua,†,*(), Qingping Gaob,†, Limei Suna, Huanmei Guoa, Xishi Taia, Dan Lia, Li Liua, Chongyi Lingc,#(), Xuping Sund,$()   

  1. aDepartment of Chemistry and Chemical Engineering,Weifang University,Weifang 261061,Shandong,China
    bDepartment of Chemical Engineering,Weifang Vocational College,Weifang 262737,Shandong,China
    cSchool of Physics,Southeast University,Nanjing 211189,Jiangsu,China
    dInstitute of Fundamental and Frontier Sciences,University of Electronic Science and Technology of China,Chengdu 610054,Sichuan,China
  • Received:2020-05-13 Accepted:2020-06-20 Online:2021-03-18 Published:2021-01-23
  • Contact: Qian Wu,Chongyi Ling,Xuping Sun
  • About author:#E-mail:lingchy@seu.edu.cn;
    *Tel:+86-0536-8785283;E-mail:qianwu2018@wfu.edu.cn;
    First author contact:These authors contributed equally to this work.
  • Supported by:
    National Natural Science Foundation of China(21801127);National Natural Science Foundation of China(21802104);the Science and Technology Development Plan of Weifang City(2019GX002);the Science and Technology Huimin Plan of Weifang High-tech Zone(2019KJHM10)

Abstract:

In the pursuit of stable,high performance Ni-based oxygen evolution reaction (OER) electrocatalysts,modifying the local chemical compositions or fabricating hybrid nanostructures to generate abundant interfaces for improving the water oxidation activity of electrocatalysts has emerged as an effective strategy. Herein,we report the facile development of a Ni3S2-CeO2 hybrid nanostructure via an electrodeposition method. Benefiting from the strong interfacial interaction between Ni3S2 and CeO2,the electron transfer is notably improved and the water oxidation activity of Ni3S2 nanosheets is significantly enhanced. In 1.0 M KOH,the Ni3S2-CeO2 electrocatalyst achieves a current density of 20 mA cm-2 at a low overpotential of 264 mV,which is 92 mV lower than that of Ni3S2. Moreover,Ni3S2-CeO2 exhibits superior electrochemical stability. Density functional theory calculations demonstrate that the enhanced OER electrocatalytic performance of Ni3S2-CeO2 can be ascribed to an increase in the binding strength of the reaction intermediates at the Ni3S2-CeO2 interface.

Key words: Ni3S2-CeO2 nanosheet, Oxygen evolution reaction, Alkaline conditions, Density functional theory calculations