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<p>Developing highly active and stable non-precious-metal electrocatalysts for the oxygen evolution reaction (OER) is essential for efficient green hydrogen production. However, monometallic catalysts exhibit poor stability and high overpotentials under high current densities. Therefore, the development of multi-metallic catalysts has become a focus of attention. Herein, we report a NiCoFeS/NF catalyst that exhibits higher OER activity in alkaline solution compare with commercial RuO<sub>2</sub>-based catalysts. The synthesized NiCoFeS/NF catalyst delivers a current density of 100&#xa0;mA cm<sup>− 2</sup> at a low overpotential of 280 mV and exhibits a Tafel slope of 49 mV dec<sup>− 1</sup>, reflecting its favorable kinetics. Furthermore, the NiCoFeS/NF catalyst exhibited a long-term stability over 120&#xa0;h, ensuring its potential for practical applications. Detailed characterizations revealed that sulfur incorporation not only creates additional active sites but also induces the self-unfolding of nanoparticles into nanosheets, thereby enlarging the electrochemically active surface area (ECSA).</p> Graphical Abstract <p></p>

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Enhancing Synergistic Interactions Among Metal Atoms Through S Doping for Efficient Oxygen Evolution Reaction

  • 期刊论文

  • 发表日期：

    2025年10月3日

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  • Shengjie Jiang,
  • Qi Wang,
  • Gonggang Sun,
  • Xinbao Li

摘要

Developing highly active and stable non-precious-metal electrocatalysts for the oxygen evolution reaction (OER) is essential for efficient green hydrogen production. However, monometallic catalysts exhibit poor stability and high overpotentials under high current densities. Therefore, the development of multi-metallic catalysts has become a focus of attention. Herein, we report a NiCoFeS/NF catalyst that exhibits higher OER activity in alkaline solution compare with commercial RuO2-based catalysts. The synthesized NiCoFeS/NF catalyst delivers a current density of 100 mA cm− 2 at a low overpotential of 280 mV and exhibits a Tafel slope of 49 mV dec− 1, reflecting its favorable kinetics. Furthermore, the NiCoFeS/NF catalyst exhibited a long-term stability over 120 h, ensuring its potential for practical applications. Detailed characterizations revealed that sulfur incorporation not only creates additional active sites but also induces the self-unfolding of nanoparticles into nanosheets, thereby enlarging the electrochemically active surface area (ECSA).

Graphical Abstract