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<p>Developing low-cost, efficient bifunctional electrocatalysts for urea-assisted water splitting is of paramount importance for sustainable hydrogen production and wastewater remediation. Herein, we report the in-situ growth of nickel trisulfide (Ni<sub>3</sub>S<sub>2</sub>) nanostructures on nickel foam (NF) (denoted as Ni<sub>3</sub>S<sub>2</sub>@NF) via a simple hydrothermal method. The three-dimensional (3D) conductive architecture of NF provides robust mechanical support and efficient electron transport, while the Ni<sub>3</sub>S<sub>2</sub> nanoparticles exhibit abundant active sites for electrocatalysis. Electrochemical measurements demonstrate that Ni<sub>3</sub>S<sub>2</sub>@NF delivers superior urea oxidation reaction (UOR) performance with a potential of 1.38&#xa0;V versus RHE at 10&#xa0;mA&#xa0;cm<sup>−2</sup> and a Tafel slope of 48.38&#xa0;mV dec<sup>−1</sup> in 1&#xa0;M KOH with 0.33&#xa0;M urea, along with excellent hydrogen evolution reaction (HER) activity featuring a low overpotential of 192&#xa0;mV and a Tafel slope of 83.02&#xa0;mV dec<sup>−1</sup> in the same electrolyte. When assembled into a two-electrode urea electrolyzer, Ni<sub>3</sub>S<sub>2</sub>@NF requires only 1.53&#xa0;V to achieve 10&#xa0;mA&#xa0;cm<sup>−2</sup>, significantly lower than the 1.76&#xa0;V needed for conventional water splitting. This work provides a viable strategy for designing cost-effective bifunctional electrodes for energy-efficient hydrogen production coupled with urea oxidation reaction.</p> Graphical Abstract <p></p>

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Self-supported Ni3S2 nanostructures on nickel foam as bifunctional electrodes for efficient urea oxidation and hydrogen evolution reactions

  • 期刊论文

  • 发表日期：

    2026年4月12日

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  • Jianfang Meng,
  • Shengli Zhu,
  • Diaoyu Zhou,
  • Chengkai Xia

摘要

Developing low-cost, efficient bifunctional electrocatalysts for urea-assisted water splitting is of paramount importance for sustainable hydrogen production and wastewater remediation. Herein, we report the in-situ growth of nickel trisulfide (Ni3S2) nanostructures on nickel foam (NF) (denoted as Ni3S2@NF) via a simple hydrothermal method. The three-dimensional (3D) conductive architecture of NF provides robust mechanical support and efficient electron transport, while the Ni3S2 nanoparticles exhibit abundant active sites for electrocatalysis. Electrochemical measurements demonstrate that Ni3S2@NF delivers superior urea oxidation reaction (UOR) performance with a potential of 1.38 V versus RHE at 10 mA cm−2 and a Tafel slope of 48.38 mV dec−1 in 1 M KOH with 0.33 M urea, along with excellent hydrogen evolution reaction (HER) activity featuring a low overpotential of 192 mV and a Tafel slope of 83.02 mV dec−1 in the same electrolyte. When assembled into a two-electrode urea electrolyzer, Ni3S2@NF requires only 1.53 V to achieve 10 mA cm−2, significantly lower than the 1.76 V needed for conventional water splitting. This work provides a viable strategy for designing cost-effective bifunctional electrodes for energy-efficient hydrogen production coupled with urea oxidation reaction.

Graphical Abstract