Supercapacitance of chemically converted graphene with composite pores

We report the synthesis and characterization of chemically converted graphene (CCG) with composite pores that has exhibited high specific capacitance (up to 350 F g−1). The porous CCG was obtained by photocatalytic reaction aided by ZnO quantum dots and it has both macropores (>50 nm) and meso/micro-pores (<10 nm). The introduction of macropores allowed penetration of electrolyte into the inter-layer space of CCG while the meso/micro-pores increased the adsorption of charges. The supercapacitor made from such porous CCG also exhibited excellent rate performance and cyclic stability.