Sprayed polyaniline layer onto chemically reduced graphene oxide as electrode for high performance supercapacitor

In this work supercapacitors were fabricated from reduced graphene oxide (RGO), polyaniline (PANI) and graphene/PANI (G/PANI) electrodes. The fabricated electrodes were characterized using scanning electron microscope (SEM) and UV-vis spectroscopy. The electrochemical activities of supercapacitors were assessed using cyclic voltammetry (CV), electrical impedance spectroscopy (EIS), and charge discharge measurements. Graphene electrodes were prepared by exposure the graphene oxide (GO) sheets to hydrazine to reduce and restore the conducting carbon network. A maximum specific capacitance of 292 F/g with energy density of 40.5 Wh/kg in an aqueous electrolyte solution had been obtained for this graphene supercapacitor. Supercapacitor of sprayed PANI electrodes produced specific capacitance of 595 F/g and energy density of 82.63 Wh/kg. Finally, a hybrid supercapacitor had been developed by spraying PANI layer onto the reduced graphene oxide sheet (G/PANI). It was found that G/PANI supercapacitor displayed a specific capacitance of 916 F/g and energy density of 127.19 Wh/kg, which is much higher than that of pristine graphene and PANI electrodes supercapacitor. (C) 2016 Elsevier B.V. All rights reserved.