Supercapacitors based on graphene-polyaniline derivative nanocomposite electrode materials

► A comparative study has made on graphene-polyaniline derivatives based supercapacitors. ► 425 F/g of specific capacitance was obtained for G-POT in 2 M H2SO4 electrolyte. ► Energy density of 123.4 Wh/kg is calculated for G-POT-ionic liquid supercapacitor. ► We report fast frequency response G-PANI derivative based supercapacitors.