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High-performance supercapacitor electrode materials are prepared from the commercially available activated carbon(AC) through a facile and low-cost chemical activation method.The obtained results show that AC activated by KOH with an alkali/carbon ratio of 6/1(ACK6) possesses a specific surface area of 3405 m~2/g,a large pore volume of 2.01 cm~3/g,and exhibits the highest initial specific capacitance of335 F/g at the current density of 0.5 A/g in 6 mol/L KOH,and 85%coloumbic efficiency for 5000 cycles at20 mV/s.
High-performance supercapacitor electrode materials are prepared from the commercially available activated carbon (AC) through a facile and low-cost chemical activation method. The obtained results show that AC activated by KOH with an alkali / carbon ratio of 6/1 (ACK6) A large pore volume of 2.01 cm -3 / g, and exhibits the highest initial specific capacitance of 335 F / g at the current density of 0.5 A / g in 6 mol / L KOH, and 85% coloumbic efficiency for 5000 cycles at 20 mV / s.