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<p>Two-dimensional layered molybdenum disulfide (MoS<sub>2</sub>) is a catalyst for hydrogen production by hydrogen evolution reaction (HER). However, it exhibits has poor electronic conductivity and a high activation energy barrier for adsorption/dissociation of water molecules in the alkaline HER, which limits its application in alkaline HER. In this paper, MoS<sub>2</sub> was uniformly grown on three-dimensional conductive carbon paper (CP) by the hydrothermal method, presenting a nanoflower shape and effectively improving the conductivity of the electrode. Subsequently, NiSe<sub>2</sub> was grown onto MoS<sub>2</sub> nanoflowers in the form of nanoparticles by the secondary hydrothermal method to form a MoS<sub>2</sub>/NiSe<sub>2</sub>/CP nanocomposite structure. The structure and morphology of MoS<sub>2</sub>/NiSe<sub>2</sub>/CP were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results showed that MoS<sub>2</sub> was composed of nanoflower-like structures formed by the combination of thin nanosheets. The average diameter of the nanoflowers is approximately 1.3 ± 0.2&#xa0;μm. NiSe<sub>2</sub> nanoparticles grew uniformly on the MoS<sub>2</sub> nanoflowers, with an average particle size of 30–100&#xa0;nm, providing a larger specific surface area that exposes more reactive sites. The MoS<sub>2</sub>/NiSe<sub>2</sub> heterointerface is conducive to electron redistribution, and the XPS peak shifts Mo 3d: + 0.4&#xa0;eV; S 2p: + 0.3&#xa0;eV. The synergistic architecture provides an electrochemical surface area (ECSA) higher than that of MoS2/CP. The introduction of NiSe<sub>2</sub> effectively inhibits the agglomeration of MoS<sub>2</sub>, enhances the dispersion of the catalyst on the substrate, and increases the effective reaction area. The MoS<sub>2</sub>/NiSe<sub>2</sub>/CP was tested for HER with an overpotential of only 112&#xa0;mV at a current density of − 10&#xa0;m cm<sup>−2</sup> ang a Tafel slope of 42.01&#xa0;mV dec⁻<sup>1</sup>. The introduction of NiSe<sub>2</sub> nanoparticles effectively promoted the water adsorption/cracking reaction and thus co-catalyzed HER with MoS<sub>2</sub>, demonstrating good stability.</p> Graphical Abstract

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Research on the Electrocatalytic Hydrogen Evolution Performance of MoS2/NiSe2/CP Nano Composites

  • 期刊论文

  • 发表日期：

    2025年9月20日

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  • Xiaoran Guo,
  • Haibo Wang,
  • Qingzhu Sun,
  • Yongchang Zhu,
  • Qirong Li,
  • Tao Tang

摘要

Two-dimensional layered molybdenum disulfide (MoS2) is a catalyst for hydrogen production by hydrogen evolution reaction (HER). However, it exhibits has poor electronic conductivity and a high activation energy barrier for adsorption/dissociation of water molecules in the alkaline HER, which limits its application in alkaline HER. In this paper, MoS2 was uniformly grown on three-dimensional conductive carbon paper (CP) by the hydrothermal method, presenting a nanoflower shape and effectively improving the conductivity of the electrode. Subsequently, NiSe2 was grown onto MoS2 nanoflowers in the form of nanoparticles by the secondary hydrothermal method to form a MoS2/NiSe2/CP nanocomposite structure. The structure and morphology of MoS2/NiSe2/CP were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results showed that MoS2 was composed of nanoflower-like structures formed by the combination of thin nanosheets. The average diameter of the nanoflowers is approximately 1.3 ± 0.2 μm. NiSe2 nanoparticles grew uniformly on the MoS2 nanoflowers, with an average particle size of 30–100 nm, providing a larger specific surface area that exposes more reactive sites. The MoS2/NiSe2 heterointerface is conducive to electron redistribution, and the XPS peak shifts Mo 3d: + 0.4 eV; S 2p: + 0.3 eV. The synergistic architecture provides an electrochemical surface area (ECSA) higher than that of MoS2/CP. The introduction of NiSe2 effectively inhibits the agglomeration of MoS2, enhances the dispersion of the catalyst on the substrate, and increases the effective reaction area. The MoS2/NiSe2/CP was tested for HER with an overpotential of only 112 mV at a current density of − 10 m cm−2 ang a Tafel slope of 42.01 mV dec⁻1. The introduction of NiSe2 nanoparticles effectively promoted the water adsorption/cracking reaction and thus co-catalyzed HER with MoS2, demonstrating good stability.

Graphical Abstract