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<p>This paper proposes a method for the rapid synthesis of porous Ni-Mg intermetallic compounds (IMCs) through a self-exothermic reaction. By adjusting the sintering temperature, the phase composition and pore structure were optimized. The hydrogen evolution reaction (HER) performance of samples sintered at various temperatures was evaluated as self-supported electrocatalysts in 1&#xa0;M KOH solutions. The results revealed that the sample sintered at 700°C for 0.5&#xa0;h exhibited superior catalytic activity with an overpotential of 70&#xa0;mV at a current density of 10&#xa0;mA&#xa0;cm<sup>−2</sup>. This exceptional HER activity is attributed to the synergistic effects of its porous structure, constituent phases, and modified electronic structures. Additionally, the passivation film formed under alkaline conditions offers excellent corrosion resistance. Furthermore, the sample sintered at 600°C for 0.5&#xa0;h exhibits a coarsened skeletal structure and partial lattice distortion, which promote stress dispersion and hinder dislocation motion, resulting in a high compressive strength of 146.2&#xa0;MPa. This study advances the controlled preparation of porous Ni-Mg IMCs, offering new insights for developing cost-effective electrocatalysts.</p>

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Preparation of Porous Ni-Mg Intermetallic Compounds as Highly Efficient Catalysts for the Hydrogen Evolution Reaction by One-Step Thermal Explosion Reaction

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Chaoqun Xie,
  • Zhichao Shang,
  • Zixuan Pang,
  • Faisal Nazeer,
  • Jianzhong Wang,
  • Hao Wang,
  • Weijia Guo,
  • Xinyang Jiao,
  • Peizhong Feng

摘要

This paper proposes a method for the rapid synthesis of porous Ni-Mg intermetallic compounds (IMCs) through a self-exothermic reaction. By adjusting the sintering temperature, the phase composition and pore structure were optimized. The hydrogen evolution reaction (HER) performance of samples sintered at various temperatures was evaluated as self-supported electrocatalysts in 1 M KOH solutions. The results revealed that the sample sintered at 700°C for 0.5 h exhibited superior catalytic activity with an overpotential of 70 mV at a current density of 10 mA cm−2. This exceptional HER activity is attributed to the synergistic effects of its porous structure, constituent phases, and modified electronic structures. Additionally, the passivation film formed under alkaline conditions offers excellent corrosion resistance. Furthermore, the sample sintered at 600°C for 0.5 h exhibits a coarsened skeletal structure and partial lattice distortion, which promote stress dispersion and hinder dislocation motion, resulting in a high compressive strength of 146.2 MPa. This study advances the controlled preparation of porous Ni-Mg IMCs, offering new insights for developing cost-effective electrocatalysts.