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<p>Hydrogen production via electrocatalytic systems integrated with urea oxidation reaction has attracted significant attention because of the decreased theoretical potential. Bimetallic nitride electrode (NiCoN grown on Ni foam, NiCoN/NF) was synthesized by using hydrothermal reaction and subsequent low-temperature plasma. In situ spectroscopic characterization confirms that NH radicals play a dominant role in plasma-assisted nitridation. The NiCoN/NF electrode demonstrates high-performance bifunctional catalysis for HER (Hydrogen Evolution Reaction) and UOR (Urea Oxidation Reaction). Co incorporation changes the valence state of Ni, which plays a strong electron coupling role, and thereby improves catalytic activity, demonstrating the synergistic effect of bimetallic catalysis. NiCoN/NF electrodes exhibit high hydrogen production efficiency and long-term high current stability. In the HER||UOR system, hydrogen production can stably continue at 100&#xa0;mA&#xa0;cm<sup>−2</sup>, saving 15.8% working energy compared to the system of HER||OER.</p> Graphical abstract <p></p>

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Bifunctional monolithic electrode NiCoN/NF by N2 plasma for hydrogen evolution and urea oxidation

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Jin Dong,
  • Xiuzhang Lan,
  • Lele Gao,
  • Guangrui Zhang,
  • Jing Zhao,
  • Guoling Li

摘要

Hydrogen production via electrocatalytic systems integrated with urea oxidation reaction has attracted significant attention because of the decreased theoretical potential. Bimetallic nitride electrode (NiCoN grown on Ni foam, NiCoN/NF) was synthesized by using hydrothermal reaction and subsequent low-temperature plasma. In situ spectroscopic characterization confirms that NH radicals play a dominant role in plasma-assisted nitridation. The NiCoN/NF electrode demonstrates high-performance bifunctional catalysis for HER (Hydrogen Evolution Reaction) and UOR (Urea Oxidation Reaction). Co incorporation changes the valence state of Ni, which plays a strong electron coupling role, and thereby improves catalytic activity, demonstrating the synergistic effect of bimetallic catalysis. NiCoN/NF electrodes exhibit high hydrogen production efficiency and long-term high current stability. In the HER||UOR system, hydrogen production can stably continue at 100 mA cm−2, saving 15.8% working energy compared to the system of HER||OER.

Graphical abstract