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<p>The development of highly active and long-lasting multifunctional electrocatalysts is crucial for advancing clean and renewable energy technologies. In this study, we developed a Mo-doped Ni<sub>x</sub>S<sub>y</sub>/Ni<sub>2</sub>P self-supported electrode anchored on nickel foam (Mo-Ni<sub>x</sub>S<sub>y</sub>/Ni<sub>2</sub>P/NF) through a sequential hydrothermal reaction and calcination-phosphating strategy. The optimized Mo-Ni<sub>x</sub>S<sub>y</sub>/Ni<sub>2</sub>P/NF demonstrates outstanding electrocatalytic activity for the hydrogen evolution reaction (HER) in both alkaline freshwater and simulated seawater environment. Electrochemical characterization reveals that the optimal Mo-Ni<sub>x</sub>S<sub>y</sub>/Ni<sub>2</sub>P/NF catalyst requires remarkably low overpotentials of 77&#xa0;mV (alkaline freshwater) and 110&#xa0;mV (alkaline simulated seawater) to achieve 10&#xa0;mA&#xa0;cm<sup>−2</sup>, accompanied by Tafel slopes of 92.24 and 112.66&#xa0;mV dec⁻<sup>1</sup>, respectively. Notably, the electrocatalyst exhibits exceptional operational stability, maintaining performance integrity for 200&#xa0;h at 100&#xa0;mA&#xa0;cm⁻<sup>2</sup> current density. Material characterization demonstrates that Mo doping induces structural modification of Ni<sub>3</sub>S<sub>2</sub> while facilitating the formation of Ni<sub>9</sub>S<sub>8</sub> phases, synergistically enhancing the catalytic architecture. Subsequent phosphating treatment further stabilizes the electrode morphology and improves interfacial charge transfer characteristics. Comparative analysis confirms the superior catalytic efficiency of Mo-Ni<sub>x</sub>S<sub>y</sub>/Ni<sub>2</sub>P/NF over conventional HER catalysts in both aqueous environments. This work provides a reasonable and feasible approach for designing highly efficient electrocatalysts.</p>

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Rational design of Mo-doped NixSy/Ni2P heterostructure on nickel foam for high-efficiency hydrogen evolution in alkaline freshwater and seawater media

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Chaoyang Zhu,
  • Jinsong Xie,
  • Yingjie Ding,
  • Yanxin Li,
  • Wei Yang,
  • Hongdian Lu,
  • Kunhong Hu

摘要

The development of highly active and long-lasting multifunctional electrocatalysts is crucial for advancing clean and renewable energy technologies. In this study, we developed a Mo-doped NixSy/Ni2P self-supported electrode anchored on nickel foam (Mo-NixSy/Ni2P/NF) through a sequential hydrothermal reaction and calcination-phosphating strategy. The optimized Mo-NixSy/Ni2P/NF demonstrates outstanding electrocatalytic activity for the hydrogen evolution reaction (HER) in both alkaline freshwater and simulated seawater environment. Electrochemical characterization reveals that the optimal Mo-NixSy/Ni2P/NF catalyst requires remarkably low overpotentials of 77 mV (alkaline freshwater) and 110 mV (alkaline simulated seawater) to achieve 10 mA cm−2, accompanied by Tafel slopes of 92.24 and 112.66 mV dec⁻1, respectively. Notably, the electrocatalyst exhibits exceptional operational stability, maintaining performance integrity for 200 h at 100 mA cm⁻2 current density. Material characterization demonstrates that Mo doping induces structural modification of Ni3S2 while facilitating the formation of Ni9S8 phases, synergistically enhancing the catalytic architecture. Subsequent phosphating treatment further stabilizes the electrode morphology and improves interfacial charge transfer characteristics. Comparative analysis confirms the superior catalytic efficiency of Mo-NixSy/Ni2P/NF over conventional HER catalysts in both aqueous environments. This work provides a reasonable and feasible approach for designing highly efficient electrocatalysts.