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<p>The Ni–Mo–B coatings with a&#xa0;molybdenum content of 7–27 wt% and boron content of 0.75–1.36 wt% were obtained by electrochemical synthesis. Their surface morphology and elemental composition were analyzed using the methods of scanning electron microscopy, energy dispersive X‑ray microanalysis, and the titrimetric method. The catalytic activity of the coatings in 1 M KOH solution was evaluated by linear voltammetry, revealing that molybdenum content influences this activity. The hydrogen evolution reaction overpotential on the most effective catalyst was 0.194 V (<i>j</i> = 100 mA/cm<sup>2</sup>), with an exchange current density of 0.16 A/cm<sup>2</sup>. The hydrogen evolution reaction on the coatings follows a&#xa0;combined Volmer–Heyrovsky mechanism. These results demonstrate the effectiveness of these coatings as electrocatalysts for the production of “green” hydrogen through alkaline electrolysis.</p>

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Properties of nickel-based galvanic coating as hydrogen evolution electrodes

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • S. A. Halaichak,
  • S. A. Korniy,
  • B. M. Datsko,
  • M. V. Danylchuk,
  • M. R. Chuchman

摘要

The Ni–Mo–B coatings with a molybdenum content of 7–27 wt% and boron content of 0.75–1.36 wt% were obtained by electrochemical synthesis. Their surface morphology and elemental composition were analyzed using the methods of scanning electron microscopy, energy dispersive X‑ray microanalysis, and the titrimetric method. The catalytic activity of the coatings in 1 M KOH solution was evaluated by linear voltammetry, revealing that molybdenum content influences this activity. The hydrogen evolution reaction overpotential on the most effective catalyst was 0.194 V (j = 100 mA/cm2), with an exchange current density of 0.16 A/cm2. The hydrogen evolution reaction on the coatings follows a combined Volmer–Heyrovsky mechanism. These results demonstrate the effectiveness of these coatings as electrocatalysts for the production of “green” hydrogen through alkaline electrolysis.