KOH活化对超级电容器用活性炭的影响  

Influence of KOH activation on active carbon for supercapacitors

作　　者：秦川丽[1,2] 董楠[2] 谭强[2] 尹鸽平[1] 白续铎[2] 

机构地区：[1]哈尔滨工业大学材料科学与工程博士后流动站,哈尔滨150001 [2]黑龙江大学化学化工与材料学院功能高分子材料重点实验室,哈尔滨150080

出　　处：《黑龙江大学自然科学学报》2009年第1期35-38,42,共5页Journal of Natural Science of Heilongjiang University

基　　金：黑龙江省博士后基金资助项目(LBH-Z07090);哈尔滨市青年基金资助项目(2004AFXXJ046);黑龙江大学校青年基金资助项目(QL200422)

摘　　要：以普通活性炭为原料,KOH为活化剂,在不同的工艺条件下制备了活化活性炭,并组装成单体超级电容器,考察了碱炭比、活化时间、活化温度对活性炭材料比电容的影响。电化学性能测试结果表明:采用KOH活化效果显著,在最佳的工艺条件下,循环伏安法测得活性炭的比电容从活化前的161.9 F.g-1提高到202.8 F.g-1,恒流充放电测得在30 mA条件下其比电容从活化前的92.4 F.g-1提高到118.0 F.g-1。粒径分布和SEM测试结果表明,活化活性炭颗粒粒径变小,粒径分布变窄,颗粒表面出现了许多新孔,呈现疏松的蜂窝状,这使活化后活性炭具有大的比表面积和高的比电容。Activated carbon was prepared by KOH activation under different conditions. Unit supercapacitors were assembled with activated carbon as electrode materials and the influence of KOH/carbon, activation time, activation temperature on specific capacitance was studied. The electrochemical results showed that the effect of KOH activation was obvious and under optimal activation condition specific capacitance of activated carbon was 202.8 F ·g^-1 compared to 161.9 F ·g^-1 of non - activated carbon by cyclic voltammetry and specific capacitance of activated carbon was 92.4 F ·g^-1 compared to 118.0 F·g^-1 of non - activated carbon by the method of galvanostatic charge/discharge with a constant current of 1 mA. The diameter distribution and SEM results showed that the particle diameters of activated carbon were smaller and its size distribution was narrower and the activated carbon showed a honeycomb structure with more new pores, which contributed to the increase of specific surface area and specific capacitance.

关 键 词：KOH活化 活性炭 超级电容器 比电容 

分 类 号：TQ427.26[化学工程]