Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (12): 3154-3160.DOI: 10.1016/S1872-2067(22)64126-3

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Enhancing hydrogen electrocatalytic oxidation on Ni3N/MoO2 in-plane heterostructures in alkaline solution

Lulu Ana,, Shaofeng Denga,, Xuyun Guob, Xupo Liua, Tonghui Zhaoa, Ke Chena, Ye Zhub, Yuxi Fua, Xu Zhaoa,#(), Deli Wanga,*()   

  1. aKey laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China
    bDepartment of Applied Physics, Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hong Kong, China
  • Received:2022-03-30 Accepted:2022-05-09 Online:2022-12-18 Published:2022-10-18
  • Contact: Xu Zhao, Deli Wang
  • About author:First author contact:Contributed equally to this work.
  • Supported by:
    National Natural Science Foundation of China(22002046);National Natural Science Foundation of China(91963109);National Key R&D Program of China(2018YFB0905600);Open Research Fund of Key Laboratory of Material Chemistry for Energy Conversion and Storage (HUST), Ministry of Education(2021JYBKF01)

Abstract:

Nickel (Ni)-based materials act as one of the most promising candidates as platinum-group-metal-free (PGM-free) electrocatalysts for hydrogen oxidation reaction (HOR) in alkaline solution. Nevertheless, the electrocatalytic activity of pure Ni is significantly limited due to the sluggish kinetics under alkaline condition. To accelerate the kinetics, constructing heterostructures and nitride structures have been developed as two representative strategies. Here, we combined the two methods and presented a facile synthesis of the sheet-like Ni3N/MoO2 in-plane heterostructures for enhanced HOR in alkaline electrolytes. Relative to Ni or Ni3N, the Ni3N/MoO2 in-plane heterostructures exhibited a significantly increased mass activity by 8.6-fold or 4.4-fold, respectively. Mechanistic studies revealed that the enhanced activity of Ni3N/MoO2 could be attributed to the weakened hydrogen adsorption and strengthened hydroxyl adsorption. This work provides a facile approach to design high-efficiency catalysts for hydrogen-oxidation catalysis and beyond.

Key words: Nickel nitride, In-plane heterostructures, Adsorption, Hydrogen oxidation reaction, Alkaline solution