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Lingli Xie,Litao Kang,Yae Li,Mangwei Cui,Bo Chang,Haiwei Jiang,Lili Gao,Xiaomin Wang,Shan Yun 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.4
Micro-porous activated carbons (ACs) with a narrow pore size distribution of 0.4–0.6 nm and high specific surface areas (1160–1315 m2 · g-1) are prepared from environment-friendly, lowgrade potassium humate (HA-K, carbon resource) and mild activating agent potassium acetate (CH3COOK). Microstructure characterizations indicate that the introduction of activating agent CH3COOK is a key step to achieve high specific surface area and carbonization degree. These ACs contain small amount of oxygen and nitrogen, and show obvious pseudo-capacitance besides double layer capacitance. As a result, the optimized ACs achieve high specific capacitances of 311 F · g-1 and 317 F · g-1 at 0.1 A · g-1 in 2 M KOH and 1 M H2SO4 aqueous electrolytes, respectively. This sample also shows a good charge-discharge cycling stability within 10 000 cycles.