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<p>In this study, reduced graphene oxide (RGO)-decorated Co<sub>3</sub>O<sub>4</sub> nanorods were synthesized via a hydrothermal method and characterized for supercapacitor applications. XRD, FTIR, Raman, SEM, HRTEM, and XPS analyses confirmed the successful formation of pure-phase cubic Co<sub>3</sub>O<sub>4</sub> and the effective integration of RGO. Among the samples, Co<sub>3</sub>O<sub>4</sub>@180&#xa0;°C showed the highest crystallinity and was selected for RGO decoration. The RGO/Co<sub>3</sub>O<sub>4</sub>@180&#xa0;°C nanocomposite exhibited superior electrochemical performance due to synergistic effects between the pseudocapacitive Co<sub>3</sub>O<sub>4</sub> nanorods and the high conductivity of RGO. Cyclic voltammetry and galvanostatic charge–discharge tests revealed a specific capacitance of 710 F/g at 10&#xa0;mV/s and 681 F/g at 2 A/g for the RGO/Co<sub>3</sub>O<sub>4</sub>@180&#xa0;°C electrode. The enhanced performance is attributed to improved electron transport, higher surface area, and better electrolyte accessibility provided by RGO.</p>

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Tuning the electrochemical performance of Co3O4 nanorods via RGO functionalization for supercapacitor applications

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • M. Joseph Salethraj,
  • G. Dayana Jeyaleela,
  • D. Govindarajan,
  • L. Guganathan,
  • Mohamed Abbas,
  • Shaeen Kalathil,
  • A. Raja

摘要

In this study, reduced graphene oxide (RGO)-decorated Co3O4 nanorods were synthesized via a hydrothermal method and characterized for supercapacitor applications. XRD, FTIR, Raman, SEM, HRTEM, and XPS analyses confirmed the successful formation of pure-phase cubic Co3O4 and the effective integration of RGO. Among the samples, Co3O4@180 °C showed the highest crystallinity and was selected for RGO decoration. The RGO/Co3O4@180 °C nanocomposite exhibited superior electrochemical performance due to synergistic effects between the pseudocapacitive Co3O4 nanorods and the high conductivity of RGO. Cyclic voltammetry and galvanostatic charge–discharge tests revealed a specific capacitance of 710 F/g at 10 mV/s and 681 F/g at 2 A/g for the RGO/Co3O4@180 °C electrode. The enhanced performance is attributed to improved electron transport, higher surface area, and better electrolyte accessibility provided by RGO.