High external surface area carbons from graphene confined carbonization of biopolymers for high rate

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  Porous carbon materials are the most common used electrode materials for supercapacitor because of their high specific surface area and rich porous structure, which contribute high specific capacitance by forming electro double layers.However, the completed porous structure always induces complex ion storage and transport mechanism, and moreover, high ion transport resistance and long diffusion distance during the charge-discharge process, severely reduce the high power performance.
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