Amelioration of supercapacitance of mixed metal oxide dispersed reduced graphene oxide and polyaniline nanocomposites using Ch3SO3H as supporting electrolyte in H2SO4

Abstract

Reduced graphene oxide/polyaniline/ Cu2O-SnO2 (5:2) nanocomposite was synthesised by facile in-situ one step chemical method. Its composition and structural morphology were characterized using powder-XRD, energy dispersive X-ray spectroscopy (EDS) and scanning electron microscopy (SEM). The capacitive performances were evaluated using cyclic voltammetry (CV), galvanostatic charge � discharge(GCD), and electrochemical impedance spectroscopy (EIS) with 0.4 M H2SO4 and a mixture of 0.4 M H2SO4 and 0.4 M CH3SO3H (1:1) as electrolytes. The amelioration of electrochemical parameters was observed in the mixture of electrolytes. The specific capacitance of 230.41 F g�1, energy density of 46.08 W h kg�1, and power density of 1530.39 W kg�1 were obtained. The enhancement of the electrochemical properties was found to be about 20 % with the mixture of 0.4 M H2SO4 and 0.4 M CH3SO3H (1:1) over bare 0.4 M H2SO4. � 2019 Elsevier Ltd. All rights reserved.