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<p>This study presents the synthesis and evaluation of CuCo<sub>2</sub>O<sub>4</sub> and CuCo<sub>2</sub>O<sub>4</sub>/activated carbon (AC) composites as electrode materials for supercapacitors. X-ray diffraction confirmed the cubic spinel phase, with crystallite size reduced from 43.89&#xa0;nm in pristine CuCo<sub>2</sub>O<sub>4</sub> to 33.79&#xa0;nm in the composite. Incorporation of AC significantly enhanced the surface area from 20&#xa0;m<sup>2</sup>/g to 562&#xa0;m<sup>2</sup>/g and reduced pore size to 1.9&#xa0;nm, enabling efficient ion transport. Electrochemical studies revealed a specific capacitance of 643.75&#xa0;F g<sup>−1</sup> for CuCo<sub>2</sub>O<sub>4</sub>/AC, notably higher than 389.06&#xa0;F g<sup>−1</sup> for pristine CuCo<sub>2</sub>O<sub>4</sub> at 1&#xa0;A g<sup>−1</sup>. Dunn analysis showed capacitive charge storage contributions of 55–82% for the composite compared to 11–33% in pristine CuCo<sub>2</sub>O<sub>4</sub>. Electrochemical impedance spectroscopy confirmed reduced internal resistance and improved charge transfer, with R<sub>s</sub> and R<sub>ct</sub> values decreasing to 4.66 Ω and 627.87 Ω, respectively. These findings demonstrate that CuCo<sub>2</sub>O<sub>4</sub>/AC composites deliver enhanced charge storage, excellent rate capability, and durable cycling, establishing them as promising electrodes for advanced supercapacitors.</p>

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Enhanced electrochemical performance of CuCo2O4 and CuCo2O4/activated carbon composites for supercapacitor applications

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月21日

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  • J. Bosco Franklin,
  • J. Venkatesan,
  • J. Fredrick Jean Paul,
  • S. Harini,
  • J. Preethi Rency Fathima,
  • S. John Sundaram,
  • Kasinathan Kaviyarasu

摘要

This study presents the synthesis and evaluation of CuCo2O4 and CuCo2O4/activated carbon (AC) composites as electrode materials for supercapacitors. X-ray diffraction confirmed the cubic spinel phase, with crystallite size reduced from 43.89 nm in pristine CuCo2O4 to 33.79 nm in the composite. Incorporation of AC significantly enhanced the surface area from 20 m2/g to 562 m2/g and reduced pore size to 1.9 nm, enabling efficient ion transport. Electrochemical studies revealed a specific capacitance of 643.75 F g−1 for CuCo2O4/AC, notably higher than 389.06 F g−1 for pristine CuCo2O4 at 1 A g−1. Dunn analysis showed capacitive charge storage contributions of 55–82% for the composite compared to 11–33% in pristine CuCo2O4. Electrochemical impedance spectroscopy confirmed reduced internal resistance and improved charge transfer, with Rs and Rct values decreasing to 4.66 Ω and 627.87 Ω, respectively. These findings demonstrate that CuCo2O4/AC composites deliver enhanced charge storage, excellent rate capability, and durable cycling, establishing them as promising electrodes for advanced supercapacitors.