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In graphene based materials, the energy storage capacity is usually improvedby rich porous structures with extremely high surface area. By utilizingsurface corrugations, this work shows an alternative strategy to activategraphene materials for large capacitance. We demonstrate how to simplyfabricate such activated graphene and how these surface structures helped torealize considerable specific capacitance (e.g., electrode capacitance of ~340F g-1 at 5 mV s-1 and device capacitance of ~ 343 F g-1 at 1.7 A g-1) and powerperformance (e.g., power density of 50 and 2500 W kg-1 at the energy density of~10.7 and 1.53 Wh kg-1, respectively) in aqueous system, which are comparableto and even better than those of highly activated graphene materials withultra-high surface area. This work demonstrates a new path to enhance thecapacity of carbon-based materials, which could be developed and combined withother systems for various improved energy storage applications.

Fast Activation of Graphene with Corrugated Surface and its Role in Improved Aqueous Electrochemical Capacitors