Porous crumpled graphene with hierarchical pore structure and high surface utilization efficiency for supercapacitor

Porous crumpled graphene (PCG) with micropores on the graphene sheets and mesopores and macropores constructed by the graphene was firstly synthesized; PCG showed high surface utilization efficiency as electrode in supercapacitor due to the unique structure, the specific capacitance per surface area was 20.7 μF cm-2, which is much higher than that of the traditional activated carbon (6.0 μF cm-2) and porous graphene (6.5 μF cm-2), approaching the theoretical value of graphene (20.9 μF cm-2).221