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<p>Nickel oxide-based nanoparticles have emerged as promising pseudocapacitive electrode compounds for energy storage applications due to their affordability, distinct redox activity, and flexibility in tuning their microstructures through controlled synthesis techniques and doping mechanisms. In this present work, silver (Ag) doped NiO nanomaterials were successfully synthesized using the sol–gel technique and applied as electrode material for the supercapacitors, achieving high pseudocapacitive performance. The properties of the as-prepared electrode materials were investigated using various characteristic techniques. The X-ray diffraction (XRD) analysis reinforced the sample’s purity and phase, with no secondary phase detected. In addition, as NiO concentration increased, the average crystallite size of the nanocomposites decreased from 13.79 to 5.34&#xa0;nm as the concentration of Ag&#xa0;increased.The surface morphological investigations confirmed the spherical nanostructured compounds and the elemental distribution of the prepared sample, respectively. Electrochemical assessments were carried out in a three-electrode configuration via cyclic voltammetry (CV), galvanostatic charging–discharging (GCD), and electrochemical impedance spectroscopy (EIS) in a 2&#xa0;M KOH electrolyte solution. The specific capacitance (C<sub>sp</sub>) of the as-fabricated electrode samples with varied dopant (Ag) concentrations was examined at different scan rates of 5 to 200&#xa0;mV/s. The specific capacitance (C<sub>sp</sub>) of the Ag-doped NiO<sub>1-x</sub> electrode with <i>x</i> = 10% was significantly higher (662 F/g) at a current density of 1 A/g, compared to other electrodes. Additionally, the Ag-doped NiO electrode demonstrated an energy density of 33.1 Wh/kg and a power density of 969&#xa0;kW/kg. These results indicate that the fabricated nanostructures, particularly with Ag doping, are promising candidates for enhancing energy storage applications.</p>

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Facile fabrication of Ag-doped NiO nanostructures as a potential electrode material for enhanced supercapacitor applications

  • 期刊论文

  • 发表日期：

    2025年12月19日

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  • C. Kathiravan,
  • K. Balachandran,
  • S. Grace Infantiya,
  • Sankaranarayanan Karthikeyan

摘要

Nickel oxide-based nanoparticles have emerged as promising pseudocapacitive electrode compounds for energy storage applications due to their affordability, distinct redox activity, and flexibility in tuning their microstructures through controlled synthesis techniques and doping mechanisms. In this present work, silver (Ag) doped NiO nanomaterials were successfully synthesized using the sol–gel technique and applied as electrode material for the supercapacitors, achieving high pseudocapacitive performance. The properties of the as-prepared electrode materials were investigated using various characteristic techniques. The X-ray diffraction (XRD) analysis reinforced the sample’s purity and phase, with no secondary phase detected. In addition, as NiO concentration increased, the average crystallite size of the nanocomposites decreased from 13.79 to 5.34 nm as the concentration of Ag increased.The surface morphological investigations confirmed the spherical nanostructured compounds and the elemental distribution of the prepared sample, respectively. Electrochemical assessments were carried out in a three-electrode configuration via cyclic voltammetry (CV), galvanostatic charging–discharging (GCD), and electrochemical impedance spectroscopy (EIS) in a 2 M KOH electrolyte solution. The specific capacitance (Csp) of the as-fabricated electrode samples with varied dopant (Ag) concentrations was examined at different scan rates of 5 to 200 mV/s. The specific capacitance (Csp) of the Ag-doped NiO1-x electrode with x = 10% was significantly higher (662 F/g) at a current density of 1 A/g, compared to other electrodes. Additionally, the Ag-doped NiO electrode demonstrated an energy density of 33.1 Wh/kg and a power density of 969 kW/kg. These results indicate that the fabricated nanostructures, particularly with Ag doping, are promising candidates for enhancing energy storage applications.