Journal of Hebei University(Natural Science Edition) ›› 2024, Vol. 44 ›› Issue (6): 602-611.DOI: 10.3969/j.issn.1000-1565.2024.06.005

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Electrocatalytic properties of two-dimensional M2X2( M: Mo、W and X: F、Cl )for hydrogen and oxygen evolution reactions

HOU Yina, WANG Bojing, WANG Ruining   

  1. College of Physics Science and Technology, Hebei University, Baoding 071002, China
  • Received:2024-04-18 Published:2024-11-19

Abstract: Starting from stripping the bulk metal of the hexagonal close-packed( HCP )crystal structure and forming a single-layer metal film, a stable ABAB-stacked metal halide compound was formed by passivating the intermediate metal layer with halogen atoms. The Mo-d projected density of states of adsorbed O atoms and non-adsorbed O atoms in *O are compared, and it is expected to reveal the relationship between electron arrangement, bonding state and catalytic performance of materials. Electronic structure calculations show that Mo2X2 and W2X2 have good electrical conductivity. By analogy with transition metal disulfides( MoS2 ), defect engineering( halogen atom vacancies )is introduced into active sites, and then their reaction energy barriers in the four-electron transfer oxygen evolution reaction are calculated. It is found that they have good catalytic performance. Among them, W2Cl2 has the best oxygen evolution catalytic performance, and the overpotential is only 1.95 V. Finally, a clear physical image is given by analyzing the coupling between electrons and orbits in detail.

Key words: Electronic structure, Electrocatalytic oxygen evolution reaction, Density functional theory

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