Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (3): 839-850.DOI: 10.1016/S1872-2067(21)63922-0

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Spin regulation on (Co,Ni)Se2/C@FeOOH hollow nanocage accelerates water oxidation

Yu Gua,b,, Xiaolei Wangc,, Muhammad Humayuna, Linfeng Lia, Huachuan Suna, Xuefei Xua, Xinying Xued, Aziz Habibi-Yangjehe, Kristiaan Temstf, Chundong Wanga,b,*()   

  1. aSchool of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China
    bState Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
    cCollege of Physics and Optoelectronics, Faculty of Science, Beijing University of Technology, Beijing 100124, China
    dDepartment of Physics, College of Science, Shihezi University, Shihezi 832003, Xinjiang, China
    eDepartment of Chemistry, Faculty of Science, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran
    fQuantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D-Box 2418, B-3001 Leuven, Belgium
  • Received:2021-06-12 Revised:2021-06-12 Online:2022-03-18 Published:2022-02-18
  • Contact: Chundong Wang
  • About author:First author contact:

    Contributed equally to this work.

  • Supported by:
    National Key R&D Program of China(2017YFE0120500);National Natural Science Foundation of China(51972129);South Xinjiang In-novation and Development Program of Key Industries of Xinjiang Production and Construction Corps (2020DB002)(2020DB002);Key Research and Development Program of Hubei(2020BAB079);Opening Project of State Key Laboratory of High Performance Ceramics and Superfine Mi-crostructure(SKL202008SIC);Fundamental Research Funds for the Central Universities(HUST 2018KFYYXJJ051);Fundamental Research Funds for the Central Universities(2019KFYXMBZ076)

Abstract:

Spin engineering is recognized as a promising strategy that modulates the association between d-orbital electrons and the oxygenated species, and enhances the catalytic kinetics. However, few efforts have been made to clarify whether spin engineering could make a considerable enhancement for electrocatalytic water oxidation. Herein, we report the spin engineering of a nanocage-structured (Co,Ni)Se2/C@FeOOH, that showed significant oxygen evolution reaction (OER) activity. Magnetization measurement presented that the (Co,Ni)Se2/C@FeOOH sample possesses higher polarization spin number (μb = 6.966 μB/f.u.) compared with that of the (Co,Ni)Se2/C sample (μb = 6.398 μB/f.u.), for which the enlarged spin polarization number favors the adsorption and desorption energy of the intermediate oxygenated species, as confirmed by surface valance band spectra. Consequently, the (Co,Ni)Se2/C@FeOOH affords remarkable OER product with a low overpotential of 241 mV at a current of 10 mA cm-2 and small Tafel slope of 44 mV dec-1 in 1.0 mol/L KOH alkaline solution, significantly surpassing the parent (Co,Ni)Se2/C catalyst. This work will trigger a solid step for the design of highly-efficient OER electrocatalysts.

Key words: Spin engineering, d-Orbital electron, Hollow nanocage, FeOOH, Oxygen evolution reaction