Preparation of activated carbon spheres as electrode material and application in supercapacitor
LIU Xue;LIU Fang;School of Chemical Engineering, Sichuan University;
Non-uniform activated carbon spheres as electrode materials for supercapacitors were prepared via hydrothermal method using glucose as raw material, followed by carbonization, activation with KOH. SEM and BET measurements were used to investigate the morphology and specific surface area of prepared materials. Electrochemical tests involved cyclic voltammetry(CV), galvanostatic charge-discharge(GCD) and electrochemical impedance spectroscopy(EIS) were performed in three electrode system to study the electrochemical performances of the material. In addition, simulated supercapacitor was assembled and its performance was evaluated by CV, GCD, EIS and application experiment. The results show that the specific surface area of the activated carbon spheres reaches 2436 m~2/g, the most probable pore diameter and average pore diameter are 1.23 nm and 2.15 nm, respectively. The specific capacitance of materials reaches 93.6 F/g at the current density of 0.5 A/g, and the capacitance retention maintains at 98% after charging-discharging for 1000 cycles. The energy density of the assembled supercapacitor reaches 6.87 Wh/kg while power density achieves 2.6×103 W/kg. The LED light can be powered by series-assembled supercapacitors charge for a short time.
【CateGory Index】： TM53;TQ424.1