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Graphene,the unique ultrathin 2D carbon sheet,has been widely used in energy storage system.Graphene has a high carrier mobility up to 10000 cm2 V-1 s-1,a high surface area of~2630 m-2 g-1 and excellent mechanical strength with a Youngs modulus of 1 TPa.These unique properties promote the graphene to be one kind of promising material in energy storage application.