摘要
以中温煤沥青为原料,采用炭化活化相结合的方法制备了表面生长有纳米石墨片层的活性炭材料。研究结果表明,当KOH与炭化物的质量比为5∶1时,能够制备出较好形态与较多含量的片层,片层的厚度为20 nm以下,宽度约为500 nm,长度从几十纳米到几微米不等,为规则的石墨结构。电化学分析表明,该结构的活性炭材料具有良好的电容性能,在100 mA/g的电流密度下充放电500次后,比电容为140 F/g。
The new-style structure activated carbon was prepared form medium temperature pitch by activation and carbonization.Vertically oriented graphite nanosheets were grown directly on activated carbon.In the experiments,compared to the other samples,sample AC2,mKOH∶mC= 5∶1,has more graphite nanosheets and the graphite nanosheets shows better microscopic morphology.The thickness of graphite nanosheets is under 20 nm,and the width is about 500 nm,and its length ranges from nanometer to micrometer.Graphite nanosheets also show good graphitization.Electrodes made from the new-style structure activated carbon show good capacitive characteristics.It can provide a specific capacitance of 140 F/g after 500 cycles at a discharge current density of 100 mA/g.
出处
《电源技术》
CAS
CSCD
北大核心
2013年第7期1167-1170,共4页
Chinese Journal of Power Sources
基金
国家重点基础研究发展计划(2011CB605602)
关键词
纳米石墨片
活性炭
电容特性
graphite nanosheets
activated carbon
capacitive characteristics
