The effect of activation technology on the electrochemical performance of calcium carbide skeleton carbon |
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Authors: | Hao Wu Xianyou Wang Xingyan Wang Xiaoyan Zhang Lanlan Jiang Benan Hu Yingping Wang |
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Affiliation: | 1. School of Chemistry, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, Xiangtan University, Xiangtan, Hunan, 411105, China
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Abstract: | Porous CaC2-derived carbon (CCDC) was synthesized by one-step route from CaC2 in a freshly prepared chlorine environment at lower temperature. As-prepared CCDC was activated by H3PO4, ZnCl2, and KOH, respectively. The effects of the activation technology on the structure and morphology of CCDC were studied by X-ray diffraction, physical N2 adsorption/desorption, and transmission electron microscopy. It has been found that the pore structure and specific surface area of CCDC are apparently improved after activation; the CCDC activated by KOH especially showed an excellent specific surface area of 1,100?m2?g?1. The electrochemical performance of supercapacitors using activated CCDC as electrode active material was studied by cyclic voltammery, galvanostatic charge/discharge, and cycle life measurements. The results indicated that the CCDCs activated by H3PO4, ZnCl2, and KOH revealed enhanced capacitances of 172.6, 198.1, and 250.1?F?g?1 in 6?M KOH electrolyte, which were increased by 11.4, 27.8, and 61.2?% compared with the pristine CCDC (155?F?g?1), respectively. Furthermore, the supercapacitors using all activated CCDCs as electrode active material exhibited excellent cycle stability, and the specific capacitance for all activated CCDC samples had nearly no change after 5,000 cycles. |
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