Influence of KOH activation techniques on pore structure and electrochemical property of carbon electrode materials^①

来源期刊：中南大学学报(英文版)2006年第4期

论文作者：李晶 李劼 赖延清 宋海申 张治安 刘业翔

文章页码：360 - 366

Key words：supercapacitor; activated carbon; chemical activation; pore structure; specific capacitance

Abstract: Taking the selection of coal-tar pitch as precursor and KOH as activated agent, the activated carbon electrode material was fabricated for supercapacitor.The surface area and the pore structure of activated carbon were analyzed by Nitro adsorption method. The electrochemical properties of the activated carbons were determined using two-electrode capacitors in 6 mol/L KOH aqueous electrolytes. The influences of activated temperature and mass ratio of KOH to C on the pore structure and electrochemical property of porous activated carbon were investigated in detail. The reasons for the changes of pore structure and electrochemical performance of activated carbon prepared under different conditions were also discussed theoretically. The results indicate that the maximum specific capacitance of 240 F/g can be obtained in alkaline medium, and the surface area, the pore structure and the specific capacitance of activated carbon depend on the treatment methods; the capacitance variation of activated carbon cannot be interpreted only by the change of surface area and pore structure, the lattice order and the electrolyte wetting effect of the activated carbon should also be taken into account.

基金信息：the National Basic Research Program of China