Investigation of Polypyrrole Degradation Using Electrochemical Impedance Spectroscopy

Investigation of Polypyrrole Degradation Using Electrochemical Impedance Spectroscopy

Author Marchesi, L. F. Q. P. Google Scholar
Simões, Fabio Ruiz Autor UNIFESP Google Scholar
Pocrifka, L. A. Google Scholar
Pereira, E. C. Google Scholar
Institution Universidade Federal de São Carlos (UFSCar)
Universidade Federal de São Paulo (UNIFESP)
Abstract In this paper, the electrochemical degradation of polypyrrole film was studied by means of overpotential application. the overpotential was 0.58 V versus SCE, and after every S mm of application of 0.58 V, a cyclic voltammogram was recorded in the range of -0.7 to 0.5 V as well as an electrochemical impedance spectroscopy and electrochemical quartz crystal microbalance (EIS and EQCM). the main characteristic is the huge increase in the charge transfer resistance (r(ct)), which indicates that the insertion process of ions in the polymer matrix is hindered by the electrochemical degradation. Once the process of insertion is damaged, the number of intercalated ions in the matrix should decrease, which is expressed by the low-frequency capacitance, which is proportional to the number of intercalated ions in the polymeric matrix. the decrease of intercalated ions has an influence in the mass variation of the polymer film, which is confirmed by EQCM measurements.
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Date 2011-08-11
Published in Journal of Physical Chemistry B. Washington: Amer Chemical Soc, v. 115, n. 31, p. 9570-9575, 2011.
ISSN 1520-6106 (Sherpa/Romeo, impact factor)
Publisher Amer Chemical Soc
Extent 9570-9575
Origin http://dx.doi.org/10.1021/jp2041263
Access rights Closed access
Type Article
Web of Science ID WOS:000293420000007
URI http://repositorio.unifesp.br/handle/11600/33951

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