Novel graphene/polyaniline/MnOx 3D-hydrogels obtained by controlled morphology of MnOx in the graphene/polyaniline matrix for high performance binder-free supercapacitor electrodes

摘要: A novel three dimensional ternary composite graphene-based hydrogel was prepared using a simple hydrothermal reaction. The graphene/polyaniline/MnOx named as PGM-HCl, obtained by the controlled morphology of MnOx preparing it in an acidic environment hydrochloric acid (HCl), offered extremely high specific capacitance 955 F g−1 at current density 1 and retention 89% after 1000 cycles 69.1% 5000 20 g−1. synergistic effects created pseudocapacitance PANI, electrochemical double layer graphene highly improved overall performance these hydrogels compared to performances individual constituents. electrode from this material gave energy 61.2 W h kg−1 even power 4.5 kW kg−1. had superior advantage being used directly for binder free supercapacitor electrodes made use low cost raw materials making very promising candidate effective, large scale applications. PGM also absence HCl purely reaction under same conditions, comparison. Thus, study opens exciting untapped potential engineering synthesizing such composites with existing storage devices like supercapacitors.