Electrochemical properties of PANI films for different counter-ions in acidic pH analysed by impedance techniques
✍ Scribed by A. Benyaich; C. Deslouis; T. El Moustafid; M.M. Musiani; B. Tribollet
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 525 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
The bulk and interracial transport properties of PANI free-standing membranes have been studied in acidic media with different counter-ions using the ac impedance technique with the fourelectrode cell. The experimental data were compared to a theoretical expression recently proposed, based on Nernst-Planck equation for mass transport and on slow discharge for ionic interracial transfer. The ionic charge transfer resistance was found negligible for all counter-ions in acidic pH. For each system, the polaronic diffusivity was in general between one and two orders of magnitude higher than the ionic one. A classification from the fastest to the slowest ionic species was established following the order: chloride, sulphate. nitrate, phosphate and perchlorate.