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<p>The one-step direct current deposition method has been investigated for the preparation of the Ni-Mo alloy and Ni-Mo-W alloy coatings on nickel-foam substrates. Under optimal conditions, binary alloy and ternary alloy electrode materials with excellent properties were prepared, and the corresponding microstructures and electrochemical properties were studied and compared. Scanning electron microscopy was used to characterize the morphology of the Ni-Mo-W/NF porous hydrogen evolution electrode. Compared with those of the Ni-Mo binary coating, the particles on the surface of the ternary coating were more tightly packed, and some of them were also stacked into a double layer; thus, the electrode had more active sites, and the surface of the coating was almost seamless. Under the test conditions of a 1-M KOH solution at room temperature, the hydrogen evolution overpotential, η<sub>10</sub>, of the Ni-Mo/NF porous hydrogen evolution electrode and the Ni-Mo-W/NF porous hydrogen evolution electrode were 0.128 V and 0.119 V, respectively. The ternary alloy deposition coating had a better electrocatalytic performance for hydrogen evolution. The Tafel slopes, R<sub>ct</sub> resistances, and the specific active surface areas of the Ni-Mo/NF binary porous electrode and the Ni-Mo-W/NF ternary porous electrode were 135.6 mV/dec and 128.3 mV/dec, 84.13 Ω and 69.23 Ω, and 23.2 cm<sup>2</sup> and 63 cm<sup>2</sup>, respectively. The Ni-Mo-W/NF porous hydrogen evolution electrode had better long-term stability, and the changes in the hydrogen evolution overpotential value were &lt; 10% after 3000 cycles.</p>

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Codeposition Mechanism and Electrochemical Performance of a Ni-Mo-W/NF Electrocatalyst for Hydrogen Evolution

  • 期刊论文

  • 发表日期：

    2025年5月13日

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  • Jinjing Du,
  • Xinxin Cui,
  • Yu Zhou,
  • Yuxiang Yangxuan,
  • Xuan Zhang,
  • Xun Liu,
  • Bin Wang,
  • Qian Li,
  • Xihong He,
  • Jun Zhu,
  • Heng Zuo

摘要

The one-step direct current deposition method has been investigated for the preparation of the Ni-Mo alloy and Ni-Mo-W alloy coatings on nickel-foam substrates. Under optimal conditions, binary alloy and ternary alloy electrode materials with excellent properties were prepared, and the corresponding microstructures and electrochemical properties were studied and compared. Scanning electron microscopy was used to characterize the morphology of the Ni-Mo-W/NF porous hydrogen evolution electrode. Compared with those of the Ni-Mo binary coating, the particles on the surface of the ternary coating were more tightly packed, and some of them were also stacked into a double layer; thus, the electrode had more active sites, and the surface of the coating was almost seamless. Under the test conditions of a 1-M KOH solution at room temperature, the hydrogen evolution overpotential, η10, of the Ni-Mo/NF porous hydrogen evolution electrode and the Ni-Mo-W/NF porous hydrogen evolution electrode were 0.128 V and 0.119 V, respectively. The ternary alloy deposition coating had a better electrocatalytic performance for hydrogen evolution. The Tafel slopes, Rct resistances, and the specific active surface areas of the Ni-Mo/NF binary porous electrode and the Ni-Mo-W/NF ternary porous electrode were 135.6 mV/dec and 128.3 mV/dec, 84.13 Ω and 69.23 Ω, and 23.2 cm2 and 63 cm2, respectively. The Ni-Mo-W/NF porous hydrogen evolution electrode had better long-term stability, and the changes in the hydrogen evolution overpotential value were < 10% after 3000 cycles.