Polyaniline (PANI), reduced graphene oxide (rGO), and rGO@PANI composite were prepared and characterized by X-ray
diffraction (XRD), Fourier transforms infra-red (FT-IR), scan electron microscopy (SEM). The electrochemical properties
were studied by using cyclic voltammetry (CV) , galvanostatic charge-discharge (GCD), and electrochemical impedance
methods (EIS). The composite of PANI and G (rGO@PANI) has a specific capacitance of 22.3 F/g, an energy density of 6.5
Wh /kg, and a power density of 153 W/kg at 0.5 A/g and great cycling performance, with 81.2% capacitance retained over
250 cycles. PANI enhances the conduction of electrons and so rGO individually. The formation of the emeraldine base for
PANI decreases the rate of faradaic process in the composite and leads to decrease in the total capacitance.