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Citation: LI Sheng, QIU Yu-Bing, GUO Xing-Peng. Electrochemical Impedance of Polypyrrole Films under Different Conditions[J]. Acta Physico-Chimica Sinica, ;2010, 26(03): 601-609. doi: 10.3866/PKU.WHXB20100307 shu

Electrochemical Impedance of Polypyrrole Films under Different Conditions

1.
School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Hubei Key Laboratory of Materials Chemistry and Service Failure, Wuhan 430074, P. R. China

Received Date: 27 July 2009
Available Online: 19 January 2010

We electropolymerized polypyrrole (PPy) films doped with para-toluene sulfonate (pTS-) and dodecyl sulfonate (DS-) by a galvanostatic method. The influence of potential and overpotential process on the electrochemical properties of the PPy films in NaCl aqueous solution were investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). In addition, the influence of insertion with or without ions on the PPy films was also studied by the EIS of PPy inserted with or without Na+ or Cl- ions in specially prepared aqueous solutions. Results showed that the ionic conductivity and the capacitance of the PPy films increased after the first CV and the electronic conductivity of the PPy/pTS increased after the insertion of Cl- ions. However, PPy films inserted with or without Na+ ion showed little difference in the EIS of the PPy films. Furthermore, the ion conductivity was affected by a change in the microstructure of the PPy films with or without ions which was also apparent in the EIS.
- Cyclic voltammetry,
- Polypyrrole,
- Electrochemical impendence,
- Ion exchange,
- Overpotential
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