Activated carbons derived from fly ash and their electorchemical performances in supercapacitors

doi:10.3969/j.issn.2095-4239.2014.04.009

Abstract

Abstract: The gasification of coal can produce large amounts of fly ash, which still contains untapped charcoal. Fly ash was demineralized by flotation and activated carbons (ACs) were prepared by activation using KOH. The effect of preparation conditions on the performance of ACs was analyzed. The results show that: ① Total pore volume and micropore volume increased with the alkali-carbon ratio, while the content of mesopores decreased; ②The capacitance increased with the alkali-carbon ratio, but become stable after 2∶1; ③The electrochemical performance was improved by demineralizion; ④Activated carbon electrode shows a high capacitance at high current density and excellent cycling performance.

Key words: fly ash, alkali-carbon ratio, activated carbon, electrochemical performance

CLC Number:

TQ424.1

ZHANG Yafei, ZHANG Chuanxiang, WANG Li, XING Baolin, HUANG Guangxu, DUAN Yuling. Activated carbons derived from fly ash and their electorchemical performances in supercapacitors[J]. Energy Storage Science and Technology, 2014, 3(4): 353-359.

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