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Supercapacitor, as a new energy storage system, has attracted increasing interests owing to its fast charge/discharge process, high-power density, and long-cycling life. However, exploring high-capacitance porous carbons as electrode materials has caused enormous attention around the world. Herein, we propose a nitrogen-doped porous carbon (NPC)-sandwiched 3D graphene (NPC-3DG) by direct freeze-drying...
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