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<p>The pursuit of highly active, durable, and earth-abundant electrocatalysts for the oxygen evolution reaction (OER) is essential for the advancement of next-generation energy conversion technologies. However, achieving a balance between high catalytic activity, long-term stability, and the use of cost-effective, earth-abundant materials remains a significant challenge in the development of efficient OER electrocatalysts. The dual-phase systems exhibit remarkable electrochemical stability, a dramatically reduced charge transfer resistance, robustness and efficiency under long-term operating conditions. In this study, we report the fabrication of a novel dual-phase Ni<sub>3</sub>B-CoS<sub>2</sub> electrocatalyst through a sequential approach involving chemical reduction followed by hydrothermal synthesis. This composite integrates the advantageous properties of transition metal borides and chalcogenides, creating a rich network of hetero interfaces that serve as highly active sites for OER. The OER activity of resulting Ni<sub>3</sub>B-CoS<sub>2</sub> electrocatalyst demonstrates a low overpotential of 120 mV at a current density of 20&#xa0;mA cm<sup>-2</sup> and Tafel slope of 214 mV dec<sup>-1</sup> in 1.0&#xa0;M KOH. This dual Ni boride-Co sulfide system tailored specifically for OER, represent a significant advancement in the field of non-noble metal-based electrocatalysts, offering promising prospects for practical applications in sustainable energy technologies.</p> Graphical abstract <p></p>

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Ni3B–CoS2 nanocomposite-coated corrosion-resistant Ti substrate for enhanced oxygen evolution reaction

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • Eda Taga Akgul,
  • Aybüke Leba Akman,
  • Osman Cem Altıncı,
  • Muslum Demir

摘要

The pursuit of highly active, durable, and earth-abundant electrocatalysts for the oxygen evolution reaction (OER) is essential for the advancement of next-generation energy conversion technologies. However, achieving a balance between high catalytic activity, long-term stability, and the use of cost-effective, earth-abundant materials remains a significant challenge in the development of efficient OER electrocatalysts. The dual-phase systems exhibit remarkable electrochemical stability, a dramatically reduced charge transfer resistance, robustness and efficiency under long-term operating conditions. In this study, we report the fabrication of a novel dual-phase Ni3B-CoS2 electrocatalyst through a sequential approach involving chemical reduction followed by hydrothermal synthesis. This composite integrates the advantageous properties of transition metal borides and chalcogenides, creating a rich network of hetero interfaces that serve as highly active sites for OER. The OER activity of resulting Ni3B-CoS2 electrocatalyst demonstrates a low overpotential of 120 mV at a current density of 20 mA cm-2 and Tafel slope of 214 mV dec-1 in 1.0 M KOH. This dual Ni boride-Co sulfide system tailored specifically for OER, represent a significant advancement in the field of non-noble metal-based electrocatalysts, offering promising prospects for practical applications in sustainable energy technologies.

Graphical abstract