Facile Synthesis and Comprehensive Characterization of Reduced Graphene Oxide (rGO)/Manganese Oxide (MnO2) Nanocomposites Derived from Graphite Powder Via Graphene Oxide Precursor Route for High-Performance Supercapacitor Electrode Applications

Abstract

A Simple in-situ synthesis technique in which reduced Graphene Oxide (rGO) and Manganese Oxide (MnO2)were synthesized in the same pot was adopted for the synthesis of (rGO/MnO2 nanocomposite because of its advantages being that it is one-pot, cost-effective, scalable, and there isn’t any need for separate synthesis and post-assembly steps. The atomic structure, functional groups, surface morphology, specific surface area, and elemental composition of the rGO/MnO2 nanocomposites were analyzed by means of X – Ray Diffraction (XRD) spectroscopy, Fourier Transform Infra – Red (FTIR) spectroscopy, Scanning Electron Microcopy (SEM), Energy Dispersion X-ray (EDX) spectroscopy and Brunauer–Emmett– Teller (BET) analysis. The SEM study inveterate the surface roughness which is advantageous to shortening the travel distance of electrons thereby enhancing good diffusion and increasing conductivity and presage the enhanced energy storage properties of the nanocomposites developed in this work. The BET surface analysis show that the material is mesoporous with the pore size found to be 2.115 nm and large surface area of . The electrochemical performance of the synthesized samples was investigated using cyclic voltammetry (CV) analysis and electrochemical impedance spectroscopy (EIS) technique. The result obtained show that, the composite has a high specific capacitance of , energy density of which is near battery – level and power density of The time constant of the nanocomposite is or about 58.5 minutes which is the standard time it will take the supercapacitor to charge up to 63.2% of its maximum voltage, or discharge down to 36.8% of its initial voltage.