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<p>Developing highly active, cost-efficient and robust electrocatalysts for alkaline hydrogen evolution reaction (HER) is vital to alkaline fuel cells and overall water electrolysis. Herein, we develop a nickel and molybdenum-based heterostructure catalyst (Ni/Mo-EG) with a distinctive near-spherical structure and “frosted-like” surface morphology via a solvent-engineering strategy. The solvent, ethylene glycol (EG), plays a critical role in reducing particle size and reducing high-valent Mo and Ni species into the corresponding low-valent species, resulting in the lattice dislocations and heterostructure formation. The presence of lattice dislocations at the heterointerface generates localized energy levels, and optimizes interfacial electronic structures. The optimized catalyst with Ni-MoO<sub>2</sub> heterojunction and a Ni/Mo molar ratio of 1, exhibited 70 mV overpotential at 10&#xa0;mA cm<sup>− 2</sup> in alkaline HER (1.0&#xa0;M KOH) and excellent durability over 100&#xa0;h with negligible performance degradation. Mechanism studies based on spectroscopic and electrochemical results reveal the strong interfacial electron interactions between Ni and MoO<sub>2</sub> accelerate charge-transfer kinetics and optimize hydrogen adsorption energy. This work highlights the significance of solvent-mediated synthesis and heterointerface engineering, offering a promising and scalable approach for developing high-performance, non-precious HER catalysts for water electrolysis applications.</p>

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Solvent-engineering heterostructure formation and electronic modulation of NiMo-based electrocatalyst for enhanced alkaline hydrogen evolution

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Rui feng Wang,
  • Zhuo Wang,
  • Ming fang Zhang,
  • Hai mei Xu,
  • Hui min Yang

摘要

Developing highly active, cost-efficient and robust electrocatalysts for alkaline hydrogen evolution reaction (HER) is vital to alkaline fuel cells and overall water electrolysis. Herein, we develop a nickel and molybdenum-based heterostructure catalyst (Ni/Mo-EG) with a distinctive near-spherical structure and “frosted-like” surface morphology via a solvent-engineering strategy. The solvent, ethylene glycol (EG), plays a critical role in reducing particle size and reducing high-valent Mo and Ni species into the corresponding low-valent species, resulting in the lattice dislocations and heterostructure formation. The presence of lattice dislocations at the heterointerface generates localized energy levels, and optimizes interfacial electronic structures. The optimized catalyst with Ni-MoO2 heterojunction and a Ni/Mo molar ratio of 1, exhibited 70 mV overpotential at 10 mA cm− 2 in alkaline HER (1.0 M KOH) and excellent durability over 100 h with negligible performance degradation. Mechanism studies based on spectroscopic and electrochemical results reveal the strong interfacial electron interactions between Ni and MoO2 accelerate charge-transfer kinetics and optimize hydrogen adsorption energy. This work highlights the significance of solvent-mediated synthesis and heterointerface engineering, offering a promising and scalable approach for developing high-performance, non-precious HER catalysts for water electrolysis applications.