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<p>Graphene-based structures provide a large surface area and facilitate strong interactions with metals. In this study, graphene quantum dots (GQDs) were combined with ZnCo<sub>2</sub>O<sub>4</sub> to enhance its electrochemical performance. The ZnCo<sub>2</sub>O<sub>4</sub>–GQDs composite was prepared by the hydrothermal method, and its successful formation was confirmed through X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and field emission scanning electron microscopy (FE-SEM). The composite electrode delivered a specific capacitance of 884.39 F g<sup>−1</sup> at a scan rate of 5&#xa0;mV&#xa0;s<sup>−1</sup> in the 2&#xa0;M KOH electrolyte. Furthermore, it retained 90% of its initial capacitance after 5000 charge–discharge cycles and demonstrated excellent cyclic stability. Furthermore, the ZnCo<sub>2</sub>O<sub>4</sub>–GQDs electrode achieved a remarkable energy density of 240.75 Wh kg<sup>−1</sup> and a power density of 2261.77 W kg<sup>−1</sup>, demonstrating its potential as a high-performance supercapacitor material.</p>

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Synergistic effect of graphene quantum dots on ZnCo2O4 for high-performance supercapacitor applications

  • 期刊论文

  • 发表日期：

    2026年6月20日

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  • Sachin B. Tanwade,
  • Amol S. Salunke,
  • Ramesh J. Deokate

摘要

Graphene-based structures provide a large surface area and facilitate strong interactions with metals. In this study, graphene quantum dots (GQDs) were combined with ZnCo2O4 to enhance its electrochemical performance. The ZnCo2O4–GQDs composite was prepared by the hydrothermal method, and its successful formation was confirmed through X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and field emission scanning electron microscopy (FE-SEM). The composite electrode delivered a specific capacitance of 884.39 F g−1 at a scan rate of 5 mV s−1 in the 2 M KOH electrolyte. Furthermore, it retained 90% of its initial capacitance after 5000 charge–discharge cycles and demonstrated excellent cyclic stability. Furthermore, the ZnCo2O4–GQDs electrode achieved a remarkable energy density of 240.75 Wh kg−1 and a power density of 2261.77 W kg−1, demonstrating its potential as a high-performance supercapacitor material.