Oxygen Doped Hierarchically Porous Carbon for Electrochemical Supercapacitor

摘要

Carbon is the promising candidate served as electrode material for electrochemical capacitors, due toits merits in good electrical conductivity, high surface area and relatively low cost. Pore sizedistribution is an important factor for carbon based electrode materials. Herein, oxygen-dopedhierarchical porous carbon (OPC) was synthesized by a two-step low cost carbonization and KOHactivation process of pomelo mesocarp. Oxygen functional groups were introduced to the structure andserved as hydrophilizing agent, which highly contributes to the permeation of electrolyte into the innerpores of the OPC material. The as prepared OPC material delivers a superhigh specific surface area at2378.1 m2/g and a large pore volume at 1.13 cm3/g. Electrochemical performances of the OPCelectrode show a high capacitance of 292 F/g at 0.5 A/g and excellent cycling stability withcapacitance retention of 96.41 % over 1000th cycle at 1 A/g.