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Acta Physico-Chimica Sinica  2007, Vol. 23 Issue (06): 877-882    DOI: 10.3866/PKU.WHXB20070616
Article     
Capacitance Properties of Porous Polypyrrole Thick Films Prepared Electrochemically by Multi-step Polymerization
WANG Jie; XU You-Long; SUN Xiao-Fei; XIAO Fang; MAO Sheng-Chun

School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, P. R. China

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Abstract  

To obtain polypyrrole (PPy) films with high area specific capacitance as electrode material for supercapacitors, the multi-step polymerization method was proposed for preparing PPy thick films with polymerization charge of 8, 10, and 12 mAh·cm-2, doped with Cl- and p-toluenesulfonate (TOS-), respectively. The capacitance properties of the PPy films were investigated by galvanostatic charge/discharge, cyclic voltammetry (CV), and electrochemical impedance spectrum (EIS) technologies. The section morphology of the PPy films was observed by using field emission electron scanning microscope (SEM). The results showed that two kinds of even porous PPy films with area specific capacitance up to 5 F·cm-2 could be obtained by multi-step method. Moreover, the mass specific capacitance (referring to the masses of polymer and doping ions) of PPy-Cl could reach 330 F·g-1, and the value of PPy-TOS could reach 191 F·g-1, which were similar with that of PPy thin films. However, the discharge rate of the PPy-TOS film was more rapid than that of the PPy-Cl film. In addition, the growth processes of PPy films from one-step
polymerization method and multi-step polymerization method were discussed.



Key wordsPolypyrrole      Supercapacitors      Capacitance      Morphology      Porous     
Received: 29 December 2006      Published: 28 April 2007
MSC2000:  O646  
Corresponding Authors: XU You-Long     E-mail: ylxu@mail.xjtu.edu.cn
Cite this article:

WANG Jie; XU You-Long; SUN Xiao-Fei; XIAO Fang; MAO Sheng-Chun. Capacitance Properties of Porous Polypyrrole Thick Films Prepared Electrochemically by Multi-step Polymerization. Acta Physico-Chimica Sinica, 2007, 23(06): 877-882.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20070616     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2007/V23/I06/877

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