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A novel and efficient CeO₂-doped MnO₂ nanorods decorated reduced graphene oxide (CeO₂-MnO₂/RGO) nanocomposite was successfully synthesized via hydrothermal method. The growth of the CeO₂ doped MnO₂ nanorods over GO sheets and reduction of GO were simultaneously carried out under hydrothermal treatment. The morphology and structure of as-synthesized nanocomposite were characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Raman spectroscopy, which revealed the formation of CeO₂-MnO₂ decorated RGO nanocomposites. The electrochemical performance of as-prepared CeO₂-MnO₂/RGO nanocomposites as an active electrode material for supercapacitor was evaluated by cyclic voltammetry, charge-discharge, and electrochemical impedance spectroscopy (EIS) methods in 2 M alkaline medium …