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<p>Nickel (Ni) is a promising catalyst for the hydrogen oxidation reaction (HOR) in alkaline media; However, its performance is limited by the strong hydrogen adsorption energy on the Ni surface and its susceptibility to oxidation at low operating potentials. Herein, we report a facile low-temperature nitrogen doping method to enhance the HOR performance of nickel-based electrocatalysts in alkaline solution. The resulting nickel particles supported on nitrogen-doped graphene sheets (Ni–N/GS) exhibit a kinetic current density (<i>J</i><sub>k</sub>) of 2.15&#xa0;mA cm<sup>−2</sup> at an overpotential of 50&#xa0;mV, significantly higher than that of the non-doped counterpart (Ni/GS, 0.63&#xa0;mA cm<sup>−2</sup>). Moreover, the Ni–N/GS catalyst demonstrates an electron transfer number of 1.87 and an improved breakdown potential of 0.22&#xa0;V vs. reversible hydrogen electrode (RHE), outperforming most recently reported Ni-based HOR catalysts. Further studies indicate that nitrogen doping into the graphene lattice can significantly modulate the electronic states of surface atoms on adjacent nickel nanoparticles, leading to strong substrate–catalyst electronic interactions, which in turn enhances both the catalytic activity and stability.</p>

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Boosting nickel-based electrocatalysts for hydrogen oxidation in alkaline media via low-temperature nitrogen doping

  • 期刊论文

  • 发表日期：

    2026年2月13日

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  • Xin Lu,
  • Xiangwen Ren,
  • Jianlong Huang,
  • Jutao Jin

摘要

Nickel (Ni) is a promising catalyst for the hydrogen oxidation reaction (HOR) in alkaline media; However, its performance is limited by the strong hydrogen adsorption energy on the Ni surface and its susceptibility to oxidation at low operating potentials. Herein, we report a facile low-temperature nitrogen doping method to enhance the HOR performance of nickel-based electrocatalysts in alkaline solution. The resulting nickel particles supported on nitrogen-doped graphene sheets (Ni–N/GS) exhibit a kinetic current density (Jk) of 2.15 mA cm−2 at an overpotential of 50 mV, significantly higher than that of the non-doped counterpart (Ni/GS, 0.63 mA cm−2). Moreover, the Ni–N/GS catalyst demonstrates an electron transfer number of 1.87 and an improved breakdown potential of 0.22 V vs. reversible hydrogen electrode (RHE), outperforming most recently reported Ni-based HOR catalysts. Further studies indicate that nitrogen doping into the graphene lattice can significantly modulate the electronic states of surface atoms on adjacent nickel nanoparticles, leading to strong substrate–catalyst electronic interactions, which in turn enhances both the catalytic activity and stability.