Graphene based all-solid-state supercapacitors with ionic liquid incorporated polyacrylonitrile electrolyte

► Fabrication of a flexible graphene based all-solid-state supercapacitor. ► Ionic liquid incorporated polyacrylonitrile electrolyte. ► A low equivalent series resistance of 4.4 Ω with fast transient response. ► The device shows excellent specific capacitance, energy and power densities. ► A good cyclic stability is observed even after 1000 cycles.