Redox switching of heteropolyanions entrapped in polypyrrole films investigated by ac electrogravimetry
In this work, the global kinetics and the exchange of protons and free solvent at the film/electrolyte interface were investigated when a PPy film doped with HPA (heteropolyanions) is polarized. The ionic and electronic transfers for the PPy-HPA system are fast because the determined values of the r...
| Veröffentlicht in: | Langmuir : the ACS journal of surfaces and colloids. - 1999. - 28(2012), 38 vom: 25. Sept., Seite 13746-57 |
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| Weitere Verfasser: | , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2012
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| Zugriff auf das übergeordnete Werk: | Langmuir : the ACS journal of surfaces and colloids |
| Schlagworte: | Journal Article Electrolytes Polyelectrolytes Polymers Protons Pyrroles polyanions polypyrrole 30604-81-0 |
| Zusammenfassung: | In this work, the global kinetics and the exchange of protons and free solvent at the film/electrolyte interface were investigated when a PPy film doped with HPA (heteropolyanions) is polarized. The ionic and electronic transfers for the PPy-HPA system are fast because the determined values of the resistances are relatively low (a few ohms). Depending on the applied potential, the global kinetics is controlled by both the ionic and electronic transfers. The transport effects were neglected here because the prepared films were very thin. Protons play an important role in charge compensation whatever the imposed potential on the PPy-HPA film. This phenomenon results from the acidic-basic properties of the SiMo(12)O(40)(4-) reduced species. A small quantity of water was also shown to be involved in the film reaction process |
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| Beschreibung: | Date Completed 14.02.2013 Date Revised 03.12.2021 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1520-5827 |