Synthesis, Characterization and Electrochemical Study of Graphene Oxide-Multi Walled Carbon Nanotube-Manganese Oxide-Polyaniline Electrode as Supercapacitor

The synthesis of graphene oxide-multi walled carbon nanotube-manganese oxide-polyaniline namely (GMMP) nanocomposite for application in supercapacitor devices was investigated. Morphology of the nanocomposites was studied by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray microanalysis (EDX). The electrochemical properties of nanocomposite based electrodes were investigated by cyclic voltammetry (CV), galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS) techniques in 0.5 mol/L Na2SO4. The specific capacitances of 173.00, 127.85, 87.50, 58.65 and 12.00 (mF cm(-2)) were obtained for GMMP, GMP (GO-MWCNT-PANI), GMM (GO-MWCNT-MnO2), GM (GO-MWCNT) and G (GO) at a scan rate of 10 mV s(-1), respectively. Also, GMMP nanocomposite retained 90% initial capacitance after 200 cycle of charge-discharge. The good electrochemical response of this nanocomposite is due to the combination of the electrical double layer capacitance of GO and MWCNT and the gradual introduction of pseudo-capacitance through the redox processes of PANI, -COOH, -OH (in MWCNT-COOH, GO-COOH and GO-OH) and MnO2. This revealed the synergistic effect of PANI, MnO2, -OH -COOH on the carbon based support. Copyright (C) 2016, The editorial office of Journal of Materials Science & Technology. Published by Elsevier Limited.