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<p>Copper oxide (CuO) nanoparticles with an average diameter of ~ 28&#xa0;nm and reduced graphene oxide (rGO) sheets measuring approximately 3.23&#xa0;nm were prepared using the sol-gel auto-combustion technique and Hummer’s method, respectively. TEM analysis revealed a thread-like structure in CuO, enhancing capacitance, while rGO exhibited a spherical morphology. Structural and electrochemical properties were characterized using XRD, UV-DRS, FTIR, FESEM, EDAX, TEM and SAED, while supercapacitor performance was analysed through CV, GCD and EIS in 3&#xa0;M KOH within a 0.0–0.6&#xa0;V range. The CuO/rGO nanocomposite showed lower resistance and higher capacitance, making it ideal for supercapacitor applications. The CuO electrode with 10% rGO exhibited a significant specific capacitance of 2081.71&#xa0;F/g at 5 mV/s, obtained by CV and the energy density of 40 Wh/Kg, obtained by the GCD of the sample, markedly surpassing the performance of individual CuO and rGO electrodes. This improvement is due to the synergistic effect of rGO’s double-layer capacitance and CuO’s redox capacitance, demonstrating its potential for energy storage applications.</p>

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Fabrication of optimized CuO/rGO nanocomposite electrode for superior supercapacitor performance

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Pravin R. Kakade,
  • Amol K. Paimode,
  • A. A. Zaware,
  • Sukadeo L. Kadam

摘要

Copper oxide (CuO) nanoparticles with an average diameter of ~ 28 nm and reduced graphene oxide (rGO) sheets measuring approximately 3.23 nm were prepared using the sol-gel auto-combustion technique and Hummer’s method, respectively. TEM analysis revealed a thread-like structure in CuO, enhancing capacitance, while rGO exhibited a spherical morphology. Structural and electrochemical properties were characterized using XRD, UV-DRS, FTIR, FESEM, EDAX, TEM and SAED, while supercapacitor performance was analysed through CV, GCD and EIS in 3 M KOH within a 0.0–0.6 V range. The CuO/rGO nanocomposite showed lower resistance and higher capacitance, making it ideal for supercapacitor applications. The CuO electrode with 10% rGO exhibited a significant specific capacitance of 2081.71 F/g at 5 mV/s, obtained by CV and the energy density of 40 Wh/Kg, obtained by the GCD of the sample, markedly surpassing the performance of individual CuO and rGO electrodes. This improvement is due to the synergistic effect of rGO’s double-layer capacitance and CuO’s redox capacitance, demonstrating its potential for energy storage applications.