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<p>Fabricating a durable electrocatalyst with performance comparable to noble metals for the alkaline hydrogen evolution reaction (HER) remains a significant challenge. In this work, we introduce a highly efficient and robust electrocatalyst by incorporating rhenium (Re) atoms into CoS nanoflakes (Re-CoS) for alkaline HER. The incorporation of Re atoms into the CoS lattice enhances the hybridization of Co 3d and S 2p orbitals, resulting in an optimized electronic structure that accelerates water dissociation on Co sites and optimizes hydrogen adsorption–desorption on S sites, thereby boosting the HER rate. The optimal Re-CoS catalyst demonstrates a low overpotential of 72&#xa0;mV at 10&#xa0;mA&#xa0;cm<sup>−2</sup> in 1&#xa0;M KOH, along with excellent long-term stability, maintaining its catalytic activity over 200&#xa0;h without significant degradation. These results suggest that the incorporation of Re atoms into CoS effectively couples the water dissociation and hydrogen ad-desorption steps of alkaline HER, offering a promising strategy for the development of noble metal-like electrocatalysts.</p> Graphical abstract <p></p>

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Electronic structure engineering of CoS catalysts by rhenium modification for efficient alkaline hydrogen evolution

  • 期刊论文

  • 发表日期：

    2025年7月30日

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  • Jian-Min Yu,
  • Yong-Teng Qian,
  • Sohyeon Seo,
  • Ngoc-Quang Tran,
  • Xiao-Dong Shao,
  • Yang Liu,
  • Jin-Sun Lee,
  • Thi-Anh Le,
  • Hyoyoung Lee,
  • Li-Shan Peng

摘要

Fabricating a durable electrocatalyst with performance comparable to noble metals for the alkaline hydrogen evolution reaction (HER) remains a significant challenge. In this work, we introduce a highly efficient and robust electrocatalyst by incorporating rhenium (Re) atoms into CoS nanoflakes (Re-CoS) for alkaline HER. The incorporation of Re atoms into the CoS lattice enhances the hybridization of Co 3d and S 2p orbitals, resulting in an optimized electronic structure that accelerates water dissociation on Co sites and optimizes hydrogen adsorption–desorption on S sites, thereby boosting the HER rate. The optimal Re-CoS catalyst demonstrates a low overpotential of 72 mV at 10 mA cm−2 in 1 M KOH, along with excellent long-term stability, maintaining its catalytic activity over 200 h without significant degradation. These results suggest that the incorporation of Re atoms into CoS effectively couples the water dissociation and hydrogen ad-desorption steps of alkaline HER, offering a promising strategy for the development of noble metal-like electrocatalysts.

Graphical abstract