Mechanism of electron transfer during the course of oxidation of N-phenyl-p-phenylenediamine polythiophene and poly-3-methylthiophene coated electrodes: Redox catalysis versus outer-sphere heterogeneous electron transfer
✍ Scribed by M.D. Levi; M. Lapkowski
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 912 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
Altatraet4omparative
studies of the mechanism of anodic oxidation of N-phenyl-pphenylenediamine (NPPD) on a bare platinum 'electrode as well as on platinum coated with poly-3-methylthiophene (P3MT) or polythiophene (PT) films have been carried out. The shift of the voltammetric peak potential corresponding to the first one-electron oxidiation step of NPPD on coated electrodes on varying the potential scan rate or the corresponding shift of half-wave potential towards more positive values in the series Pt < Pt/P3MT < Pt/pT have been observed. Two alternative models of kinetics of solute redox reactions such as the model of catalytic reactions mediated by conventional redox-polymers and the thermodynamic model of electrochemical doping of x-conjugated polymers with regard to the kinetics of outer-sphere electron-transfer reactions have been discussed in an attempt to account for the experimental results obtained. Evidence in favour of the applicability of the second model have been summarized.