Enhancement of the energy storage properties of supercapacitors using graphene nanosheets dispersed with metal oxide-loaded carbon nanotubes

► Graphene nanosheets (GNs) dispersed with SnO2 nanoparticles loaded multiwalled carbon nanotubes (SnO2-MWCNTs) as electrode materials for supercapacitors. ► A maximum specific capacitance of 224 F g−1, power density of 17.6 kW kg−1 and an energy density of 31 Wh kg−1. ► Excellent cycle life with ∼81-92% of the initial specific capacitance retained after 6000 cycles, depending on electrode type. ► Dispersion of SnO2-MWCNTs helps in the improvement of the capacitance properties of GNs. ► GNs/SnO2-MWCNTs is a promising supercapacitor electrode material for practical applications.