Mesoporous Graphene Derived from Block Copolymer Templates for High-Energy Density Supercapacitor
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A novel fabrication approach of mesoporous graphene (m-G), in which self-assembled mesoporous structures of poly(styrene)-block-poly(2-vinylpyridine) copolymer (PS-b-P2VP) are exploited as both mesostructured catalytic template and a carbon source. Notably, the mesostructured catalytic template is sufficient to act as a rigid support without structural collapse while PS-b-P2VP converts to graphene, generating mesoporous graphene with pore diameter (ca. 3.5 nm) and high specific surface area (186 m2/g). When the EDLCs were prepared using the obtained m-G and ionic liquids (ILs), excellent electrochemical behaviors were achieved even in high operation voltages (0 ~ 3.5 V), including a large specific capacitance (130.2 F/g at 0.2 A/g), high-energy density of 55.4 Wh/kg at power density of 350 W/kg, and excellent cycle stability (>10000 cycles). This study demonstrates that m-G is a promising material for high-performance energy storage devices.