Supercapacitor performance of MnO2/NiCo2O4@N-MWCNT hybrid nanocomposite electrodes

Abstract

MnO2/NiCo2O4@N-MWCNT hybrid nanocomposite was synthesized by the hydrothermal route using ammonia and urea as catalysts. The structural, morphological and compositional properties of the hybrid composites were analyzed using XRD, SEM, HR-TEM SEM-EDAX, XPS, FTIR, and Raman measurements. The electrochemical properties of the prepared hybrid composite were studied by cyclic voltammetry analysis. The outcome of the electrochemical studies revealed a specific capacitance of similar to 543 Fg(-1) at 0.5Ag(-1) current density in the KOH (6M) electrolyte, with a stability of similar to 88% up to 5000 cycles. The obtained results clearly demonstrated the significance of the nanostructured MnO2/NiCo2O4@N-MWCNT hybrid composite in supercapacitor applications. [GRAPHICS] . HighlightsControlled synthesis of MnO2@NiCo2O4/N-MWCNT hybrid composite by hydrothermal process is reported.MnO2@NiCo2O4/N-MWCNT hybrid composite showed specific capacitance similar to 543 Fg(-1) at 0.5A.g(-1).Nanocrystalline morphology of the composite material enhanced the electrochemical properties.The hybrid composite shows the excellent capacitance retention similar to 88% up to 5000 cycles.