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<p>The hydrogen evolution reaction (HER) plays a vital role in the production of green hydrogen, but it still faces practical issues, including low cost-efficiency, reduced catalytic activity and limited lifetime under industry-required ampere-scale current densities. Here we report a heterogeneous nucleation strategy to produce a scaled-up, inexpensive, energy-efficient and highly stable NiMo-based electrode (that is, h-Ni/MoO<sub>2</sub>) for HER electrolysis. The abundant inner surface formed by H<sub>2</sub>O release during annealing favours an encapsulated structure of the h-Ni/MoO<sub>2</sub> catalyst, that is, Ni nanoparticles in porous MoO<sub>2</sub> matrix, which ensures high HER activity (low overpotential of 70.9 ± 4.5 mV) and high HER stability (over 25,000 h) in 1 M KOH at −1,000 mA cm<sup>−2</sup>. When using h-Ni/MoO<sub>2</sub> as the cathode catalyst, practical anion-exchange membrane water electrolysis delivers high activity (for example, 5.6 A cm<sup>−2</sup> at 1.8 V and 10.2 A cm<sup>−2</sup> at 2.0 V) and high durability (for example, over 2,000 h at 1,000 mA cm<sup>−2</sup>).</p><p></p>

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Nickel nanoparticles encapsulated inside mesoporous MoO2 for industrially stable anion-exchange membrane water electrolysis

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • Zhiheng Li,
  • Gaoxin Lin,
  • Linqin Wang,
  • Wen Wu,
  • Yunxuan Ding,
  • Licheng Sun

摘要

The hydrogen evolution reaction (HER) plays a vital role in the production of green hydrogen, but it still faces practical issues, including low cost-efficiency, reduced catalytic activity and limited lifetime under industry-required ampere-scale current densities. Here we report a heterogeneous nucleation strategy to produce a scaled-up, inexpensive, energy-efficient and highly stable NiMo-based electrode (that is, h-Ni/MoO2) for HER electrolysis. The abundant inner surface formed by H2O release during annealing favours an encapsulated structure of the h-Ni/MoO2 catalyst, that is, Ni nanoparticles in porous MoO2 matrix, which ensures high HER activity (low overpotential of 70.9 ± 4.5 mV) and high HER stability (over 25,000 h) in 1 M KOH at −1,000 mA cm−2. When using h-Ni/MoO2 as the cathode catalyst, practical anion-exchange membrane water electrolysis delivers high activity (for example, 5.6 A cm−2 at 1.8 V and 10.2 A cm−2 at 2.0 V) and high durability (for example, over 2,000 h at 1,000 mA cm−2).