Characteristics of Electric Double Layer in Different Aqueous Electrolyte Solutions for Supercapacitors

作     者：PAN Qun TU Wenmao DING Lan MI Guomin 

作者机构：School of Resources and Environmental Engineering Wuhan University of Technology Wuhan 430070 Hubei China Dandong Scking Electronic Development Co. LTD Dandong 118000 Liaoning China 

出 版 物：《Wuhan University Journal of Natural Sciences》 (武汉大学学报（自然科学英文版）)

年 卷 期：2012年第17卷第3期

页      面：200-204页

学科分类：081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 

基　　金：Supported by the National Science and Technology Pillar Plan Project of China (2008BAE60B08) Science and Technology Project of Liaoning Province (2009304007) 

主　　题：double electrode layer electrolyte supercapacitor AC impedance cyclic voltammetry 

摘      要：Aiming to find suitable electrolytes for electric double layer capacitor （EDLC）,the relationship between the formation velocity of electric double layer and the specific capacitance in different electrolyte （H 2 SO 4,KOH,KCl,NH 4 Cl,and LiOH） solutions was investigated by cyclic voltammetry and AC impedance with varying frequency and potential,which was also analyzed based on Stern model and Gouy-Chapman diffusion layer *** shows that the capacitance is positively correlated with the formation velocity of the electric double layers,which is affected by the type of ions applied,the concentration of the electrolyte solution,and the potential and frequencies as *** electrolyte solutions of 6 mol/L KOH and 4 mol/L H2SO4 provide the largest capacitance,reaching 214 and 186 μF/cm^ 2,*** 6 mol/L KOH and 4 mol/L H 2 SO 4 solutions are suitable electrolytes for EDLC applications using Pt as electrodes.