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<p>The design of cost-effective electrocatalysts with excellent performance is imperative for water splitting. Herein, novel heterostructured NiS/Ni<sub>3</sub>S<sub>4</sub>/Ni<sub>3</sub>S<sub>2</sub>/NF electrocatalysts were successfully prepared by hydrothermal synthesis in a one-pot process, exhibiting efficient activity in the oxygen evolution reaction (OER) with a low overpotential of 237 mV at 10&#xa0;mA cm<sup>-2</sup> and a corresponding Tafel slope of 30.44 mV dec<sup>-1</sup> in 1.0&#xa0;M KOH. The overall electrocatalytic water splitting cell voltage was only 1.51&#xa0;V at 10&#xa0;mA cm<sup>-2</sup> in KOH when using NiS/Ni<sub>3</sub>S<sub>4</sub>/Ni<sub>3</sub>S<sub>2</sub>/NF as the anode and platinum on carbon (Pt/C) as the cathode. Density functional simulations further revealed that the exceptional activity primarily stems from the coupling interactions between Ni<sub>3</sub>S<sub>2</sub>(110)/Ni<sub>3</sub>S<sub>4</sub>(100) interfaces, which not only optimizes the adsorption free energy of OER intermediates but also enhances catalytic performance. This synthetic strategy provides an avenue for expanding other cost-effective multiphase metal heterostructures.</p> Graphical Abstract <p></p>

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Synthesis of NiS/Ni3S4/Ni3S2/NF Heterostructure as High-Efficiency Electrocatalyst for Oxygen Evolution Reaction

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • Tuojie Yang,
  • Lei Yang,
  • Yiming Xie,
  • Chang Dai,
  • Zihang Li,
  • Sifan Zhang,
  • Ke Wang,
  • Fulong Li,
  • Lin Jiang,
  • Yinghui Sun

摘要

The design of cost-effective electrocatalysts with excellent performance is imperative for water splitting. Herein, novel heterostructured NiS/Ni3S4/Ni3S2/NF electrocatalysts were successfully prepared by hydrothermal synthesis in a one-pot process, exhibiting efficient activity in the oxygen evolution reaction (OER) with a low overpotential of 237 mV at 10 mA cm-2 and a corresponding Tafel slope of 30.44 mV dec-1 in 1.0 M KOH. The overall electrocatalytic water splitting cell voltage was only 1.51 V at 10 mA cm-2 in KOH when using NiS/Ni3S4/Ni3S2/NF as the anode and platinum on carbon (Pt/C) as the cathode. Density functional simulations further revealed that the exceptional activity primarily stems from the coupling interactions between Ni3S2(110)/Ni3S4(100) interfaces, which not only optimizes the adsorption free energy of OER intermediates but also enhances catalytic performance. This synthetic strategy provides an avenue for expanding other cost-effective multiphase metal heterostructures.

Graphical Abstract