Mixed ionic-electronic conduction of a conducting polymer film. Ac impedance study of polypyrrole

✍ Scribed by C. Deslouis; T. El Moustafid; M.M. Musiani; B. Tribollet

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 638 KB
• Volume: 41
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(95)00455-6

✦ Synopsis

Polypyrrole (PPy) films were studied by ac impedance spectroscopy both in a free-standing membrane and in a modified electrode arrangement. The experimental results were analyzed by comparison with previously derived kinetic models, allowing to obtain, through a non-linear least-squares fitting procedure, both transport (diffusion coefficients and concentration of ion-and electron-exchanging sites) and interfacial parameters (charge transfer resistances and double layer capacitances). PPy film thickness, nature and concentration of the electrolytes and duration of the immersion were varied in a systematic way. The transport properties were found to depend on both anions and cations contained in the electrolyte and to be independent of polymer film thickness.