Analysis of CNT and rGO mediation for an efficient super-capacitive response in Cr-doped Co3O4 based composites

Abstract In our work, we present structural, morphological, and electrochemical analysis of Cr-doped Co3O4 nanostructures and their CNT/rGO based composites. Hydrothermal and solvothermal routes are followed to prepare the samples. The active material is prepared via a polymer-based binder and is used as electrode in a three-electrode electrochemical system. X-ray diffraction confirms the spinel-type cubic crystal structure, while the stoichiometric elemental contents are verified using an energy dispersive X-ray spectroscopy. Well-shaped layered growth of the nanocomposites is revealed by field emission scanning electron microscopy. The electrochemical analysis is performed using a 2M KOH electrolyte solution and a three-electrode electrochemical setup. The pure and Cr-doped nanocomposite samples reveal a pseudo capacitive behavior in all the samples. The systematic capacitive and resistive response of the samples has also been presented in this report. Aforementioned attributes make the synthesized specimen a potential candidate for an electrode material.