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In this study, a novel cobalt-doped cerium oxide (CeO2)on reduced graphene oxide (rGO) substrate was successfully prepared through a hydrothermal method. The comprehensive characterization of the synthesized nanocomposite involved X-ray diffraction studies (XRD), Raman spectrum analysis, High Resolution Transmission Electron microscopy (HRTEM), and Field Emission Electron Microscopy (FE-SEM). The effective surface area of CeO2/rGO and Co-CeO2/rGO was determined using the Randles-Sevecik equation, revealing values of 4.02X10-5 cm2 and 6.35X10-5 cm 2, respectively. Cyclic Voltammetry (CV) was employed to investigate the electrochemical reversibility behavior, demonstrating promising results for Co-CeO2/rGO nanocomposite. Electrochemical impedance spectroscopy(EIS) further highlighted low charge transfer resistance (Rct) and enhanced double-layer capacitance (Cdl). Notably, the synthesized nanocomposite exhibited excellent electrocatalytic activity for methanol and formic acid oxidation in an acidic medium. Overall, this work provides valuable insights into the synthesis characterization, and electrochemical performance of Co-CeO2/rGO nanocomposite, showcasing their potential applications in energy-related processes. [ABSTRACT FROM AUTHOR]

[Display omitted] • The synthesis of cobalt doped on cerium oxide (Co-CeO 2) nanoparticles on reduced graphene oxide (RGO) sheets using a facile hydrothermal technique is described in this paper. • To achieve good electrochemical performance, the stoichiometric ratios of the cobalt, and cerium precursors were adjusted. • The specific capacitance of the material Csp was found to be 843.8 Fg−1 at a lower current density of 1.0 Ag−1. The synthesis of cobalt nanocrystals deposited cerium oxide (Co-CeO 2) on reduced graphene oxide (RGO) sheets using a facile hydrothermal technique is described in this paper. The Cobalt deposited CeO 2 /RGO electrode shows outstanding electrocatalytic activity. The phase, morphology, and elemental composition and oxidation states of Co-CeO 2 validated by PXRD, HRTEM-EDX and XPS respectively. The average surface area of the Co-CeO 2 /RGO composite is shown to be 81.125 m2/g as estimated by N 2 adsorption isotherm. The cobalt doped with CeO 2 nanoparticles over graphene sheets studied by HRTEM coupled with EDX. The electrochemical behavior of the Co-CeO 2 /RGO nanocomposite was studied using as an electrode by cyclic voltammetry (CV), Galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS) measurements. The specific capacitance of the material Csp was found to be 843.8 Fg−1 at a lower current density of 1.0 Ag−1. Furthermore, with a power density of 230Wkg−1, it has a greater energy density of 93.19 Whkg−1. [ABSTRACT FROM AUTHOR]