SUPERCAPACITIVE BEHAVIOR OF FLEXIBLE GRAPHENE-CARBON NANOTUBE SANDWICH PAPER

摘要

Due to the excellent electronic and thermal conductivities, high specific surface area and large aspect/length-diameter ratio, graphene and carbon nanotube have been considered as a great building block for various nano-structured active materials for supercapacitors[l-4]. A particularly attractive option is to design and develop highly flexible electrodes consisting of graphene and/or CNT as vital component of high performance energy storage systems [2-5]. This work reports a highly flexible CNT-graphene hybrid sandwich paper prepared via vacuum filtration of aqueous dispersions containing these carbon nanofillers. It is found that the hybrid papers exhibit greatly enhanced performance in terms of specific capacitance and rate capability, compared with the neat graphene paper and CNT bucky paper. The hybrid paper presents several advantages, including improved electrical conductivity through the formation of 3D networks and much increased surface area for electrochemical reaction by creating gaps between graphene layers.