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<p>Supercapacitors are widely attracting research interest due to their fast charging, high power density, and long-term stability. In this work, NiCo₂O₄/MOF-5/rGO (NMG) hybrid electrodes were synthesized via a hydrothermal method, and their electrochemical performance was investigated. Studies were carried out with three-electrode, asymmetric two-electrode, and CR2032 coin-cell configurations using 1&#xa0;M KOH electrolyte. The optimized NMG electrode delivered a specific capacitance of 30&#xa0;F g⁻¹ in the three-electrode system, and the asymmetric two-electrode device achieved a maximum power density of 608.83&#xa0;W kg⁻¹ and an energy density of 0.558 Wh kg⁻¹, while the CR2032 coin-cell device exhibited a power density of 531.6&#xa0;W kg⁻¹ and an energy density of 0.088 Wh kg⁻¹ with cycling stability over 5000 cycles. The assembled coin-cell successfully powered an LED, demonstrating the practical feasibility of the developed NMG electrode for high-power energy storage applications.</p> Graphical abstract <p></p>

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NiCo2O4/MOF-5/rGO hybrid electrodes for high-power asymmetric supercapacitors: Analysis of three-electrode, two-electrode and coin cell devices

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Sreeja Saravanan,
  • Velmurugan Venugopal

摘要

Supercapacitors are widely attracting research interest due to their fast charging, high power density, and long-term stability. In this work, NiCo₂O₄/MOF-5/rGO (NMG) hybrid electrodes were synthesized via a hydrothermal method, and their electrochemical performance was investigated. Studies were carried out with three-electrode, asymmetric two-electrode, and CR2032 coin-cell configurations using 1 M KOH electrolyte. The optimized NMG electrode delivered a specific capacitance of 30 F g⁻¹ in the three-electrode system, and the asymmetric two-electrode device achieved a maximum power density of 608.83 W kg⁻¹ and an energy density of 0.558 Wh kg⁻¹, while the CR2032 coin-cell device exhibited a power density of 531.6 W kg⁻¹ and an energy density of 0.088 Wh kg⁻¹ with cycling stability over 5000 cycles. The assembled coin-cell successfully powered an LED, demonstrating the practical feasibility of the developed NMG electrode for high-power energy storage applications.

Graphical abstract