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<p>In this study, reduced graphene oxide/cobalt oxide@nickel (rGO/Co₃O₄@Ni) nanocomposites were synthesized via a low-temperature hydrothermal route followed by annealing at 600&#xa0;°C. Structural, spectroscopic, and morphological characterizations verified the successful integration of Co₃O₄ nanoparticles with rGO on a 3D Ni foam scaffold. Raman analysis confirmed Co–O vibrational modes and graphitic carbon signatures with improved graphitization after annealing, while XPS identified mixed Co²⁺/Co³⁺ oxidation states. SEM revealed a porous nano-architectured surface favorable for electrolyte access. Nitrogen adsorption–desorption analysis indicated a mesoporous structure, demonstrating adequate accessible surface area and pore distribution to support efficient ion transport. Electrochemical testing in 1&#xa0;M KOH showed that the synergistic rGO/Co₃O₄@Ni architecture delivered a high specific capacitance of 1056&#xa0;F/g at 1&#xa0;A/g, along with excellent cycling stability, retaining 92.16% capacitance after 4000 charge–discharge cycles. EIS measurements further confirmed reduced resistance and enhanced ion/electron transport. These results demonstrate the potential of rGO/Co₃O₄@Ni as a highly efficient and durable electrode material for next-generation supercapacitors.</p>

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Development and comprehensive analysis of rGO/Co3O4@Ni nanocomposite: dual-functional materials for magnetic and supercapacitor applications

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Dadamiah PMD Shaik,
  • Rosaiah Pitcheri,
  • Saikh Mohammad Wabaidur,
  • Naresh Kumar Reddy P,
  • D Nagamalleswari

摘要

In this study, reduced graphene oxide/cobalt oxide@nickel (rGO/Co₃O₄@Ni) nanocomposites were synthesized via a low-temperature hydrothermal route followed by annealing at 600 °C. Structural, spectroscopic, and morphological characterizations verified the successful integration of Co₃O₄ nanoparticles with rGO on a 3D Ni foam scaffold. Raman analysis confirmed Co–O vibrational modes and graphitic carbon signatures with improved graphitization after annealing, while XPS identified mixed Co²⁺/Co³⁺ oxidation states. SEM revealed a porous nano-architectured surface favorable for electrolyte access. Nitrogen adsorption–desorption analysis indicated a mesoporous structure, demonstrating adequate accessible surface area and pore distribution to support efficient ion transport. Electrochemical testing in 1 M KOH showed that the synergistic rGO/Co₃O₄@Ni architecture delivered a high specific capacitance of 1056 F/g at 1 A/g, along with excellent cycling stability, retaining 92.16% capacitance after 4000 charge–discharge cycles. EIS measurements further confirmed reduced resistance and enhanced ion/electron transport. These results demonstrate the potential of rGO/Co₃O₄@Ni as a highly efficient and durable electrode material for next-generation supercapacitors.