▎ 摘　　要

In the current work, the effect of aniline concentration on the polymerization process and supercapacitive behavior of graphene oxide/multiwalled carbon nanotubes/polyaniline (GMP) nanocomposites were studied. Based on the obtained results, GMP nanocomposite with 0.5 M aniline (GMP5) was selected as the optimum concentration in terms of high current density and high specific capacitance. Nafion-based ionic polymer-free metal composite (IPFMC) supercapacitor was fabricated for the GMP5 nanocomposite. Solid-state symmetric supercapacitor was made after spraying of GMP5 in. on both sides of Nafion membrane. The electrochemical properties were investigated by cyclic voltammetry (CV), galvanostatic charge-discharge (CD), and electrochemical impedance spectroscopy (EIS) techniques in 0.5 M Na2SO4.The specific capacitance of 383.25 F g(-1) (326 mF cm(-2)) and 527.5 F g(-1) (42 mF cm(-2)) was obtained for the GMP5 in solid-state supercapacitor and three-electrode cell at a scan rate of 10 mV s(-1), respectively. The maximum energy and power densities of 53.64 and 1777.4 W kg(-1) were obtained for the IPFMC-based supercapacitor.