石墨化改性晶须状碳纳米管及其电容特性  

Graphitized Whisker-like Carbon Nanotubes as Electrodes for Supercapacitors

作　　者：聂艳艳[1] 孙晓刚[1] 蔡满园[1] 吴小勇[1] 刘珍红 岳立福 

机构地区：[1]南昌大学机电工程学院,南昌330031

出　　处：《材料研究学报》2016年第7期538-544,共7页Chinese Journal of Materials Research

基　　金：江西省教育厅项目KJLD13006;江西省科技厅科研项目2012ZBBE50012和20142BBE50071资助~~

摘　　要：用CVD法合成晶须状碳纳米管(WCNTs),对其进行石墨化纯化处理。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)、拉曼光谱和热重分析(TGA)对其进行表征。以纤维素为基体材料,WCNTs为功能材料,将分散好的WCNTs与纸纤维混合,抽滤制成WCNTs复合纸,WCNTs复合纸的电导率由石墨化前14.1 S/m提升到石墨化后325.1 S/m。采用两电极体系,以1 mol/L Li PF6为电解液,通过循环伏安及恒流充放电方法来研究WCNTs复合纸为极片的超级电容器性能,在扫描速率为1 m V/s时,石墨化WCNTs复合纸电极的比容量达到90 F/g。在电流密度为800 m A/g时,比能量和比功率分别为21.3 Wh/kg和2.1 k W/kg,表现出良好的超级电容器性能。Whisker-like carbon nanotubes（WCNTs） were produced by chemical vapor deposition（CVD） and then purified by graphitization at high temperature.The WCNTs were characterized by scanning electron microscope（SEM）,transmission electron microscopy（TEM）,X-ray diffraction（XRD）,Raman spectra and thermogravimetric analysis（TGA）.Water suspension consisted of WCNTs as functional material and cellulose fibers as matrix was prepared by speed-cutting procedure,and then WCNTs containing composite papers were prepared with the above suspension by vacuum filtration.The conductivity of the composite papers increased from 14.1 S/m to 325.1 S/m after incorporation of the graphitized WCNTs.A supercapacitor cell with two-electrodes was constructed with 1 mol/L Li PF6 as electrolyte.The electrochemical performance of supercapacitor was examined by cyclic voltammetry and galvanostatic charge/discharge.The results indicated that the supercapacitor has a maximum capacitance of 90 F/g by a scan rate of 1 m V/s.The specific energy and specific power reached 21.3 Wh/kg and 2.1 k W/kg respectively by a current density of 800 m A/g.These showed an excellent application prospect of the modified carbon nanotubes for supercapacitors.

关 键 词：复合材料 碳纳米管 石墨化 复合纸 超级电容器 

分 类 号：O646[理学—物理化学]