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Citation: Deng Mei-Gen, Zhang Zhi-An, Hu Yong-Da, Wang Bin-Hua, Yang Bang-Chao. Effect of Activation and Surface Modification on the Properties of Carbon Nanotubes Supercapacitors[J]. Acta Physico-Chimica Sinica, ;2004, 20(04): 432-435. doi: 10.3866/PKU.WHXB20040422 shu

Effect of Activation and Surface Modification on the Properties of Carbon Nanotubes Supercapacitors

1.
Institute of Microelectronics ＆ Solid State Electronics, University of Electronic Science ＆ Technology of China, Chengdu　610054

Received Date: 23 October 2003
Available Online: 15 April 2004

To increase the specific capacitance of supercapacitors based on carbon nanotubes (CNTs),activation and surface modification were carried out by using KOH and concentrated nitric acid respectively. The materials were analyzed by transmission electron microscopy (TEM), N2 adsorption and infrared spectra (IR). The effect of activation and surface modification on the performance of the CNTs supercapacitors was also studied by cyclic voltammetry and galvanostatic charge/discharge. The results showed that activation enlarged the BET specific surface area of the CNTs and hence increased the specific capacitance of the supercapacitors from 43 F•g－1 to 73 F•g－1.By surface modification, large quantities of electroactive functional groups were adsorbed on the surface of the CNTs, thus pseudocapacitance was induced and the specific capacitance was further increased to 94 F•g－1.
- Carbon nanotubes;Activation;Surface modification;Supercapacitors
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