化学学报 ›› 2007, Vol. 65 ›› Issue (21): 2387-2392. 上一篇    下一篇

研究论文

活性碳纳米管的制备及其在有机电解液中的电容性能研究

徐斌*,1,2,吴锋2,苏岳锋2,曹高萍1,陈实2,杨裕生1   

  1. (1防化研究院 北京 100083)
    (2北京理工大学化工与环境学院 北京 100081)
  • 投稿日期:2007-02-08 修回日期:2007-05-09 发布日期:2007-11-14
  • 通讯作者: 徐斌

Preparation of Activated Carbon Nanotubes and Their Electro-chemical Capacitive Performance in Organic Electrolyte

XU Bin*,1,2; WU Feng2; SU Yue-Feng2; CAO Gao-Ping1; CHEN Shi2; YANG Yu-Sheng1   

  1. (1 Research Institute of Chemical Defense, Beijing 100083)
    (2 School of Chemical Engineering & the Environment, Beijing Institute of Technology, Beijing 100081)
  • Received:2007-02-08 Revised:2007-05-09 Published:2007-11-14
  • Contact: XU Bin

以KOH为活化剂对碳纳米管进行化学活化制备双电层电容器用高比表面积活性碳纳米管. 采用TEM和N2吸附法表征活性碳纳米管的结构, 采用恒流充放电、循环伏安、交流阻抗等评价其在1 mol•L-1 Et4NBF4/PC中的电容性能. 随活化剂用量增大、活化温度升高和活化时间的延长, 活性碳纳米管的比表面积和比电容都呈增大的趋势. 活化剂用量为3∶1, 800 ℃活化4 h制备的活性碳纳米管的比表面积663 m2•g-1, 比活化前提高了3倍, 其比电容达57.2 F• g-1, 比活化前提高了2倍. 将活性碳纳米管的比电容与其比表面积相关联, 发现两者之间具有非常好的线性关系, 并分析了原因.

关键词: 双电层电容器, 碳纳米管, 活化, 比表面积, 比电容

Activated carbon nanotubes (ACNTs) with high surface area have been successfully prepared from carbon nanotubes by KOH activation for electric double layer capacitors. The microstructure of the ACNTs was characterized by TEM and nitrogen adsorption isotherms. The electrochemical capacitive performances of the ACNTs in 1 mol•L-1 Et4NBF4/PC electrolyte were evaluated with cyclic voltammetry (CV), galvanostatic charge/discharge and ac impedance spectroscopy, etc. When the amount of activation agent increased, or the activation temperature rose, or the activation time was prolonged, the specific surface area and the capacitance of the ACNTs all showed an increasing tendency. The surface area of the ACNT sample prepared by KOH activation with KOH/C ratio of 3∶1 at 800 ℃ for 4 h reached 663 m2•g-1, three times larger than that of the pristine non-activated carbon nanotubes. Its specific capacitance reached 57.2 F•g-1, three times as large as that of the non-activated carbon nanotubes. It was found that there was a linear dependence of the capacitance on their BET surface area for activated carbon nanotubes.

Key words: electric double layer capacitor, carbon nanotubes, activation, specific surface area, specific capacitance