Citation: ZHONG Jia-Liang, GUO Feng-Jiao, MI Hong-Yu. Preparation and Electrochemical Capacitance Profile of Carrot-Based Porous Carbon[J]. Chinese Journal of Inorganic Chemistry, ;2015, (11): 2128-2134. doi: 10.11862/CJIC.2015.299
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Porous carbon materials were prepared from freeze-dried porous carrots as carbon sources through carbonization at 600 ℃ in nitrogen atmosphere, followed by KOH activation. The microstructures and capacitive properties of carbon materials were examined by FTIR, XRD, SEM, TEM, CV, CD and EIS. Electrochemical results indicated that, after being activated, porous carbon showed a significant improvement in specific surface area (from 7 m2·g-1 to 147 m2·g-1). Moreover, activated carbon displayed a maximum specific capacitance of 414 F·g-1. Even when the current increased to 4 A·g-1, its capacitance retention reached 74.5%. While non-activated carbon had only 253 F·g-1 and 45.1% retention. Additionally, activated carbon exhibited high electrochemical stability with 94% retention after 8000 cycles. The remarkable improvement in capacitive performance was strongly related to the significant improvement of specific surface area and the increase of mesopore.
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