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<p>This study investigates the synthesis of a Graphene Oxide/Copper Oxide (GO/CuO) nanocomposite via a hydrothermal method for supercapacitor applications. The structural and morphological characteristics of the nanocomposite were systematically analyzed using X-ray diffraction (XRD), which confirmed the formation of a tetragonal hausmannite crystal structure, and Scanning Electron Microscopy (SEM). Electrochemical evaluation revealed excellent performance of the GO/CuO electrodes, achieving a specific capacitance (Cs) of 710.9 F/g at a current density of 0.5 A/g and a scan rate of 5&#xa0;mV/s in 1&#xa0;M KOH solution. Dielectric studies conducted over a frequency range of 50&#xa0;Hz to 5&#xa0;MHz demonstrated a decreasing trend in the dielectric constant and loss with increasing frequency. In addition, the electronic properties, including the valence electron, plasma energy, average energy gap (Penn gap), Fermi energy, and electronic polarizability, were determined. AC electrical conductivity measurements further complemented the electrochemical characterization, indicating a conductivity value of 1.958 × 10<sup>−6</sup>&#xa0;eV. These findings highlight the potential of the GO/CuO nanocomposite as a high-performance material for energy storage devices.</p>

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Preparation and characterization studies of structural, morphological, electrochemical, and dielectric properties of nano graphene oxide/copper oxide (GO/CuO) nanocomposite suitable for supercapacitor application

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • M. Sappani Muthu,
  • J. Judes,
  • S. Arul Ravi,
  • M. Ambrose Rajkumar,
  • S. Anbarasu

摘要

This study investigates the synthesis of a Graphene Oxide/Copper Oxide (GO/CuO) nanocomposite via a hydrothermal method for supercapacitor applications. The structural and morphological characteristics of the nanocomposite were systematically analyzed using X-ray diffraction (XRD), which confirmed the formation of a tetragonal hausmannite crystal structure, and Scanning Electron Microscopy (SEM). Electrochemical evaluation revealed excellent performance of the GO/CuO electrodes, achieving a specific capacitance (Cs) of 710.9 F/g at a current density of 0.5 A/g and a scan rate of 5 mV/s in 1 M KOH solution. Dielectric studies conducted over a frequency range of 50 Hz to 5 MHz demonstrated a decreasing trend in the dielectric constant and loss with increasing frequency. In addition, the electronic properties, including the valence electron, plasma energy, average energy gap (Penn gap), Fermi energy, and electronic polarizability, were determined. AC electrical conductivity measurements further complemented the electrochemical characterization, indicating a conductivity value of 1.958 × 10−6 eV. These findings highlight the potential of the GO/CuO nanocomposite as a high-performance material for energy storage devices.