Cobalt nanocrystals doped on CeO2/RGO nanocomposite for supercapacitor applications

[Display omitted] •The synthesis of cobalt doped on cerium oxide (Co-CeO2) 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-CeO2) on reduced graphene oxide (RGO) sheets using a facile hydrothermal technique is described in this paper. The Cobalt deposited CeO2/RGO electrode shows outstanding electrocatalytic activity. The phase, morphology, and elemental composition and oxidation states of Co-CeO2 validated by PXRD, HRTEM-EDX and XPS respectively. The average surface area of the Co-CeO2/RGO composite is shown to be 81.125 m2/g as estimated by N2 adsorption isotherm. The cobalt doped with CeO2 nanoparticles over graphene sheets studied by HRTEM coupled with EDX. The electrochemical behavior of the Co-CeO2/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.