Application of corncobbased activated carbon as e

Authors: Yuxin Wang Bingsi Liu Zhiqiang Shi Fengdan Liu

Publish Date: 2012/06/05

Volume: 18, Issue: 3, Pages: 217-223

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Abstract

To investigate the influence of expansion pretreatment for materials on carbon structure activated carbons ACs were prepared from corncob with/without expansion pretreatment by KOH activation the structure properties of which were determined based on N2 adsorption isotherm at 77 K The results show that the expansion pretreatment for corncobs is beneficial to the preparation of ACs with high surface area The specific surface area of the AC derived from corncob with expansion pretreatment AC1 is 325 larger than that without expansion pretreatment AC2 Furthermore to probe the potential application of corncobbased ACs in electric doublelayer capacitor EDLC the prepared ACs were used as electrode materials to assemble EDLC and its electrochemical performance was investigated The results indicate that the specific capacitance of AC1 is 276 F/g at 50 mA/g which increases by 27 compared with that of AC2 217 F/g As electrode materials AC1 presents a better electrochemical performance than AC2 including a higher voltage maintenance ratio and a lower leakage current

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