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<p>In the present study, zinc-nickel sulfides composite (ZnS/NiS) was prepared by a simple in-situ hydrothermal method on nickel foam (NF) and applied as a proper electrocatalyst for urea oxidation (UOR) and hydrogen evolution (HER) reactions in water electrolysis. The structural features of ZnS/NiS@NF were explored by several characterization methods (XRD, SEM, EDS). Electrocatalytic behavior of the composite toward UOR and HER was studied in detail in a 3-electrode cell design. As an efficient UOR catalyst, the required potential and Tafel slope decreased on ZnS/NiS@NF when compared to stepwise electrodes, i.e., Ni(OH)<sub>2</sub>@NF, ZnNi(OH)@NF and NiS@NF. The catalytic activity in the cathode toward HER was also superior to the stepwise electrodes (E = -228 mV vs. RHE at 50&#xa0;mA cm<sup>− 2</sup>). In a two-electrode cell design, ZnS/NiS@NF electrode was used both as cathode and anode in a common electrolyte (0.33&#xa0;M urea + 0.1&#xa0;M KOH). In the absence of urea, oxygen was evolved in anode at 2.0&#xa0;V (for 100 mAcm<sup>− 2</sup>), while in the presence of urea, UOR proceeded at 1.78&#xa0;V. The proposed electrocatalyst, ZnS/NiS@/NF, was highly stable during 20&#xa0;h continuous hydrogen generation in the urea-assisted water electrolysis through chronopotentiometry. Electrochemical and structural studies demonstrated its capability for industrial use in green, sustainable hydrogen production and treatment of urea-containing wastewaters.</p> Graphical Abstract <p></p>

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Binder-free zinc-nickel sulfides as highly efficient bifunctional electrocatalyst for hydrogen generation through urea-assisted water electrolysis

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Fatemeh Salarvand,
  • Fahimeh Jalali,
  • Sara Sheikhi

摘要

In the present study, zinc-nickel sulfides composite (ZnS/NiS) was prepared by a simple in-situ hydrothermal method on nickel foam (NF) and applied as a proper electrocatalyst for urea oxidation (UOR) and hydrogen evolution (HER) reactions in water electrolysis. The structural features of ZnS/NiS@NF were explored by several characterization methods (XRD, SEM, EDS). Electrocatalytic behavior of the composite toward UOR and HER was studied in detail in a 3-electrode cell design. As an efficient UOR catalyst, the required potential and Tafel slope decreased on ZnS/NiS@NF when compared to stepwise electrodes, i.e., Ni(OH)2@NF, ZnNi(OH)@NF and NiS@NF. The catalytic activity in the cathode toward HER was also superior to the stepwise electrodes (E = -228 mV vs. RHE at 50 mA cm− 2). In a two-electrode cell design, ZnS/NiS@NF electrode was used both as cathode and anode in a common electrolyte (0.33 M urea + 0.1 M KOH). In the absence of urea, oxygen was evolved in anode at 2.0 V (for 100 mAcm− 2), while in the presence of urea, UOR proceeded at 1.78 V. The proposed electrocatalyst, ZnS/NiS@/NF, was highly stable during 20 h continuous hydrogen generation in the urea-assisted water electrolysis through chronopotentiometry. Electrochemical and structural studies demonstrated its capability for industrial use in green, sustainable hydrogen production and treatment of urea-containing wastewaters.

Graphical Abstract