Aplication of Corncob-Based Activated Carbon as Electrode Material for Electric Double-Layer Capacitors

作     者：王玉新 刘炳泗 时志强 刘凤丹 

作者机构：School of SciencesTianjin University Tianjin Key Laboratory of Fiber Modification and Functional FiberCollege of Materials Scienceand EngineeringTianjin Polytechnic University Tianjin Lishen Battery Joint-Stock Co. Ltd 

出 版 物：《Transactions of Tianjin University》 (天津大学学报（英文版）)

年 卷 期：2012年第18卷第3期

页      面：217-223页

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 

基　　金：National Natural Science Foundation of China (No. 50902102 and No. 51172160) 

主　　题：corncob-based activated carbon electrode material electric double-layer capacitor 

摘      要：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 （AC-1） is 32.5% larger than that without expansion pretreatment （AC-2）. Furthermore, to probe the potential application of corncob-based ACs in electric double-layer capacitor （EDLC）, the prepared ACs were used as electrode materials to assemble EDLC, and its electrochemical performance was investi- gated. The results indicate that the specific capacitance of AC-I is 276 F/g at 50 mA/g, which increases by 27% com- pared with that of AC-2 （217 F/g）. As electrode materials, AC-1 presents a better electrochemical performance than AC-2, including a higher voltage maintenance ratio and a lower leakage current.