Chinese Journal of Catalysis ›› 2023, Vol. 50: 306-313.DOI: 10.1016/S1872-2067(23)64459-6

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Bimetallic single-cluster catalysts anchored on graphdiyne for alkaline hydrogen evolution reaction

Bin Chena, Ya-Fei Jiangb, Hai Xiaoa,*(), Jun Lia,b,*()   

  1. aDepartment of Chemistry and Engineering Research Center of Advanced Rare-Earth Materials of Ministry of Education, Tsinghua University, Beijing 100084, China
    bDepartment of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China
  • Received:2023-03-09 Accepted:2023-05-21 Online:2023-07-18 Published:2023-07-25
  • Contact: *E-mail: haixiao@tsinghua.edu.cn (H. Xiao), junli@tsinghua.edu.cn (J. Li).
  • Supported by:
    National Natural Science Foundation of China(92261111);National Natural Science Foundation of China(22122304);National Key Research and Development Project(2022YFA1503000);National Key Research and Development Project(2022YFA1503900);Guangdong Provincial Key Laboratory of Catalysis(2020B121201002);Tsinghua University Initiative Scientific Research Program(20221080065)

Abstract:

Pt-based electrocatalysts suffer from high water dissociation barriers that limit their overall hydrogen evolution reaction (HER) activities in alkaline media. Here we predict the bimetallic four-atom single-cluster catalysts (SCCs) M1A3 (M as later transition metal and A as early transition metal) with pyramidal structure supported on graphdiyne (GDY) for alkaline HER. Theoretical calculations show that the stable Pt1Ti3/GDY SCC delivers high alkaline HER activity via the Volmer-Heyrovsky mechanism. The excellent catalytic performance of Pt1Ti3/GDY SCC is attributed to both the low-valent Pt site that renders an optimal hydrogen adsorption free energy (ΔG*H), and the synergic effect of adjacent Ti sites that leads to a low water dissociation barrier. By screening alternative M1 in M1Ti3/GDY for optimal ΔG*H and facile water dissociation, we further identify the Ir1Ti3/GDY SCC to be a potentially high-performing alkaline HER electrocatalyst at low *OH coverage. Our work provides new insights and guidelines for the rational design of alkaline HER electrocatalysts.

Key words: Alkaline hydrogen evolution reaction, Water dissociation kinetics, Single-cluster catalysis, Pt1Ti3/Graphdiyne