Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (5): 1351-1359.DOI: 10.1016/S1872-2067(21)63935-9

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Toward enhanced alkaline hydrogen electrocatalysis with transition metal-functionalized nitrogen-doped carbon supports

Peng Lia, Guoqiang Zhaoa,b(), Ningyan Chenga, Lixue Xiac, Xiaoning Lia, Yaping Chenb, Mengmeng Laoa, Zhenxiang Chenga, Yan Zhaoc,d, Xun Xua(), Yinzhu Jiangb, Hongge Panb,e, Shi Xue Doua, Wenping Sunb()   

  1. aInstitute for Superconducting & Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, Wollongong, NSW 2522, Australia
    bSchool of Materials Science and Engineering, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China
    cState Key Laboratory of Silicate Materials for Architectures, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China
    dThe Institute of Technological Sciences, Wuhan University, Wuhan 430072, Hubei, China
    eInstitute of Science and Technology for New Energy, Xi'an Technological University, Xi'an 710021, Shaanxi, China
  • Received:2021-07-27 Accepted:2021-08-30 Online:2022-05-18 Published:2022-03-23
  • Contact: Guoqiang Zhao, Xun Xu, Wenping Sun
  • Supported by:
    Australian Research Council (ARC) through a Discovery Project(DP200100365);a Linkage Project(LP160100273);“Hundred Talents Program” of Zhejiang University;China Postdoctoral Science Foundation(2021M690132);China Postdoctoral Science Foundation(2021T140588);Office of China Postdoc Council(YJ20200160)

Abstract:

Superior catalyst supports are crucial to developing advanced electrocatalysts toward heterogeneous catalytic reactions. Herein, we systematically investigate the role of transition metal-functionalized N-doped carbon nanosheets (M-N-C, M = Mn, Fe, Co, Ni, Cu, Mo, and Ag) as the multifunctional electrocatalyst supports toward hydrogen evolution/oxidation reactions (HER/HOR) in alkaline media. The results demonstrate that all the M-N-C nanosheets, except Cu-N-C and Ag-N-C, can promote the alkaline HER/HOR electrocatalytic activity of Pt by accelerating the sluggish Volmer step, among which Mn plays a more significant role. Analyses reveal that the promotion effect of M-N-C support is closely associated with the electronegativity of the metal dopants and the relative filling degree of their d-orbitals. For one, the metal dopant in M-N-C with smaller electronegativity would provide more electrons to oxygen and hence tune the electronic structure of Pt via the M-O-Pt bonds at the interface. For another, the transition metal in M-N4 moieties with more empty d orbitals would hybridize with O 2p orbitals more strongly that promotes the adsorption of water/hydroxyl species. The results demonstrate the conceptual significance of multifunctional supports and would inspire the future development of advanced electrocatalysts.

Key words: Multifunctional support, Hydrogen oxidation reaction, Hydrogen evolution reaction, Metal-support interaction, Electrocatalysis