Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (02): 361-366.doi: 10.3866/PKU.WHXB201112063

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Restructured Carbon Aerogels and Their Electrochemical Performances

XU Zi-Jie, JI Tao, ZHAO Lei, WANG Wei-Yan, YANG Chun-Yan, GAN Li-Hua   

  1. Department of Chemistry, Tongji University, Shanghai 200092, P. R. China
  • Received:2011-09-26 Revised:2011-11-26 Published:2012-01-11
  • Contact: XU Zi-Jie E-mail:xuzijie-tj@126.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20973127).

Abstract: Restructured carbon aerogels (RCAs) were obtained by annealing carbon aerogels (CAs) in sodium melt at 800 °C for 3 h and the differences in electrochemical performance between the resultant CAs and RCAs were studied. X-ray diffraction (XRD), Raman scattering spectra, gas physisorption (BET), transmission electron microscopy (TEM), and electrochemical impedance spectroscopy (EIS) were used to probe the structures of CAs and RCAs. The studies indicated that the amorphous carbon particles were rearranged in sodium melt, in which the surface area of the resultant RCAs was 48% larger than that of CAs. Two concentrated pore distributions were observed at the apertures of 2 and 4 nm in RCAs. The pore volume at apertures below 10 nm is 30% of the total volume in RCAs, which is 3 times as many as that in CAs. Electrochemical performances of both CAs and RCAs were investigated and the results indicate that the inner resistance of RCAs is only 45% of that in the sample of CAs. The results also indicate that RCAs display good performance in capacitance characteristics.

Key words: Carbon aerogel, Sodium melt, Restructure, Electrochemical impedance spectroscopy

MSC2000: 

  • O646