Optimal Electrochemical Performances of CO_2 Activated Carbon Aerogels for Supercapacitors

作     者：常丽娟 FU Zhibing LIU Miao YUAN Lei WEI Jianjun HE Yong wei LIU Xichuan 王朝阳 

作者机构：Science and Technology on Plasma Physics Laboratory Institute of Atomic and Molecular Physics Sichuan University College of Material Science and Engineering Xihua University 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2014年第29卷第2期

页      面：213-218页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Funded by the National Science Foundation of China(Nos.11074176 and 10976019) the Research Fund for the Doctoral Program of Higher Education of China(No.20100181110080) 

主　　题：activated carbon aerogels specific surface area specific capacitance wettability cycling performance 

摘      要：Activated carbon aerogels（ACAs） derived from sol-gel polycondensation of resorcinol （R） and formaldehyde （F） were pyrolyzed under Ar flow and activated in CO2 atmosphere. The morphology of ACAs was characterized by scanning electron microscopy （SEM） and the structural properties were determined by N2 adsorption at 77 K. The results show that ACAs have a typical three-dimensional nanonetwork structure composing of cross-linking of carbon nanoparticles. The specific surface area and the total pore volume remarkably increase with increasing activation time while the previous porous structure still remains. The specific capacitance of the 950-10-ACA electrode can reach up to 212.3 F/g in 6 mol/L KOH electrolyte. The results of constant-current charge-discharge testing indicate that the ACAs electrodes present fast charge- discharge rate and long cycle life （about 98% capacitance retained after 3000 charge-discharge cycles at 1.25 mA/cm2）. Lower internal resistances can be achieved for 950-10-ACA electrode in KOH electrolyte. Our investigations are very important to improve the wettability and electrochemical performance of electrode for supercapacitors.