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<p>This study employs a cost-effective chemical co-precipitation method to enhance zinc sulfide (ZnS) for supercapacitor applications through nickel (Ni) doping. ZnS samples with varying Ni concentrations (1%, 3%, and 5%) were synthesized and analyzed for electrochemical performance. Nickel doping significantly enhanced the specific capacitance of ZnS, with the Ni 3%-ZnS sample achieving 893.5&#xa0;F/g at a scan rate of 10&#xa0;mV/s, compared to 460.7&#xa0;F/g for undoped ZnS. Structural and morphological studies confirmed uniform incorporation of Ni ions into the ZnS lattice, leading to reduced crystallite size and enhanced porosity. Electrochemical analyses in a three-electrode setup revealed that Ni doping improved ion transport, decreased charge-transfer resistance, and enhanced charge–discharge kinetics. The Ni 3%-ZnS electrode demonstrated excellent cyclic stability, retaining high capacitance after 1000 cycles. These improvements, attributed to an optimized pore structure and increased surface area, highlight the potential of Ni-doped ZnS as an efficient electrode material for supercapacitors.</p>

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High-Capacity Nickel-Doped ZnS Electrodes: A Cost-Effective Solution for Advanced Supercapacitors

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月5日

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  • Emmanuel Tom,
  • Abhijai Velluva,
  • Anit Joseph,
  • Tiju Thomas,
  • Rakesh K.E,
  • Mithra Geetha,
  • Kishor Kumar Sadasivuni,
  • Joji Kurian

摘要

This study employs a cost-effective chemical co-precipitation method to enhance zinc sulfide (ZnS) for supercapacitor applications through nickel (Ni) doping. ZnS samples with varying Ni concentrations (1%, 3%, and 5%) were synthesized and analyzed for electrochemical performance. Nickel doping significantly enhanced the specific capacitance of ZnS, with the Ni 3%-ZnS sample achieving 893.5 F/g at a scan rate of 10 mV/s, compared to 460.7 F/g for undoped ZnS. Structural and morphological studies confirmed uniform incorporation of Ni ions into the ZnS lattice, leading to reduced crystallite size and enhanced porosity. Electrochemical analyses in a three-electrode setup revealed that Ni doping improved ion transport, decreased charge-transfer resistance, and enhanced charge–discharge kinetics. The Ni 3%-ZnS electrode demonstrated excellent cyclic stability, retaining high capacitance after 1000 cycles. These improvements, attributed to an optimized pore structure and increased surface area, highlight the potential of Ni-doped ZnS as an efficient electrode material for supercapacitors.