Acta Chimica Sinica ›› 2007, Vol. 65 ›› Issue (21): 2387-2392. Previous Articles     Next Articles



  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

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