针状焦基活性炭的制备及其作为EDLCs电极材料的电化学性能  

Preparation of high porosity carbon electrodes from raw needle coke and their characterization for EDLCs

作　　者：李强[1] 李开喜[1] 王芙蓉[1] 孙国华[1] 

机构地区：[1]中国科学院炭材料重点实验室中国科学院山西煤炭化学研究所

出　　处：《新型炭材料》2005年第4期335-342,共8页New Carbon Materials

基　　金：国家自然科学基金(50272070)~~

摘　　要：以针状焦生焦为原料,通过KOH化学活化法,在不同活化条件下制备出一系列高比表面积活性炭,并对这些活性炭进行了孔结构表征。而后以30%KOH溶液为电解液,测试了由所获活性炭制备的一系列电极的电双层电容性能。结果表明:在碱炭比7∶1、活化温度850℃时,所制活性炭的BET比表面积为2 728m2/g,孔容为2.14cm3/g,统计平均孔径为4.4nm,大中孔孔容占总孔孔容约50%。该活性炭电极的比电容达305F/g,有相对较高的能量密度、良好的功率特性以及双电层电容特性。A series of high porosity carbons were prepared from raw needle coke activated by KOH. Nitrogen adsorption was used to characterize the BET surface area and pore structure of the porous carbon. When the ratio of KOH to carbon powder is 7：1 and the heat treatment temperature 850 ℃ the BET surface area of the porous carbon obtained is 2 728 m^2/g, the pore volume is 2.14 cm^3/g, the statistical average pore diameter is 4.4 nm, and ratio of the sum of macro and meso pore volume to the total pore volume is about 50 %. The performance of the porous carbon electrode in 30 % KOH was investigated. Its specific capacitance is 305 F/g, it has a relatively higher energy density, better power characteristics, and a more satisfactory electric double-layer capacitance performance than other samples.

关 键 词：针状焦生焦 活性炭 双电层电容 循环伏安 

分 类 号：TQ424[化学工程]