Title: Preparation of HyperCoal-based activated carbons for electric double layer capacitor
Abstract: Coal-based activated carbons(ACs) were prepared from HyperCoal using KOH and CaCO3as activating agent,and were used as electrode materials for electric double layer capacitor(EDLC) using 0.5 mol/L TEABF4/PC as the electrolytic solution. The porosity of the ACs was characterized using N2 adsorption at 77 K. The effects of carbonization temperature,activation temperature,activation time and activating agent on the capacitance characteristic of ACs were investigated. The results showthat the specific surface area and the specific capacitance decreased with the increase of carbonization temperature. A high activation temperature and a long activation time is not beneficial for the specific capacitance of EDLC. CaCO3 significantly inhibited the porosity development during KOH activation and gave ACs with quite lowspecific surface area and specific capacitance. The ACs prepared at carbonization temperature of 500 ℃,activation temperature of 800 ℃,KOH/char ratio of 4 and activation time of 2 h reached a specific surface area of 2 540 m2/g and a total pore volume of 1.65 cm3/g and achieved the maximum specific capacitance of 46.0 F/g.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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Cited By Count: 2
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