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Graphene nanofibers has high conductivity,huge specific surface area(SSA),short diffusion distance for ions of ionic liquids electrolyte,so they are one of the great electrode in a 4 V supercapacitor.On the base of the article which has been reported[1],wepropose to use hard template(ZnO whisker or MgO@ZnO core-shell structure)to prepare small-diameter hollow graphene nanofibers by a chemical vapor deposition(CVD)method.