摘要
以不同粒度范围的石油焦为原料，KOH为活化剂，采用化学活化工艺制备了超级电容器用活性炭电极材料。采用N2吸附法表征了活性炭材料的BET比表面积及孔结构；在1mol／L的Et4NBF4／AN有机电解液体系下组装成模拟电容器，并考察了活性炭材料的电化学性能。结果表明：随着原料粒度的减小，活性炭的振实密度和收率先增大，然后再减小。原料粒度范围越窄，活性炭具有越小的BET比表面积和孔容。在1mol／L的Et4NBF4／AN电解液体系下，随着石油焦粒度的不断减小，活性炭材料的质量比容量不断增大，在粒度〈38μm时取得最大值140F／g。粒度为38-44μm的石油焦制备出的活性炭在1A／g电流下质量比容量为126．6F／g，在20A／g电流下质量比容量为116．2F／g，容量衰减只有8．2％，表现出良好的功率特性。
Taking the petroleum cokes with different distribution of particle size as raw material and KOH as activated agent, the ultra-high surface area activated carbons employed for supercapacitors were prepared by chemical activation process. The BET specific surface area and the pore structure of activated carbon were analyzed by N2 adsorption method. The electrochemical properties of the activated carbons were determined using two-electrode capacitors in 1mol/L Et4 NBF,/AN electrolyte. Results indicate that the yield and tap density increases then decreases with the decreasing particle size of petroleum cokes. And the petroleum cokes with narrow distribution developed lower BET specific surface area and pore volume of activated carbons. On the other hand, the activated carbon prepared by petroleum cokes of 〈38μm shows the highest specific capacitance of 144F/g. And activated carbon prepared by petroleum cokes of 38-44μm shows good power discharge behavior, the specific capacitance is 126.6F/g at the current of 1A/g and 116.2F/g at the current of 20A/g, respectively, with the capacitance loss of 8.2%.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2009年第5期813-816,819,共5页
Journal of Functional Materials
基金
国家科技支撑计划资助项目(2007BAE12B01)
关键词
石油焦
活性炭
孔结构
化学活化
超级电容器
petroleum coke
activated carbon
pore structure
chemical activation
supercapacitor
