The electrochemical behaviour of the system polypyrrole/Nafion-117{sup {sq_bullet}}
- Institute of Physical Chemistry, University of Saarbruecken, D-66123 Saarbruecken (Germany)
The electrochemical synthesis of the polypyrrole/Nafion{sup {sq_bullet}} composite was carried out potentiodynamically in 0.1 M aqueous solutions of NaBr or NaF saturated with pyrrole. In NaBr solutions the starting potential of the polymerization reaction was determined to be 420 mV vs. SCE with a nucleation overvoltage of about 100 mV. The electropolymerization is strongly dependent on the anion of the supporting electrolyte and leads to the formation of at least 10{percent} polypyrrole doped with the anion of the electrolyte within the composite. The reversible cyclovoltammograms of the films in aqueous solutions containing Na{sup +} as cation (0.1 M) are governed by cation motion and show an increasing peak separation with the scan-rate. A double logarithmic plot of the peak currents vs. the scan-rates indicates that diffusion-control determines the ion exchange during charge variation. The Redox-potential of the composite with Na{sup +} as cation was determined to be ({minus}500{plus_minus}50)mV vs. SCE. {copyright} {ital 1996 American Institute of Physics.}
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 286477
- Report Number(s):
- CONF-950119--
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 354; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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