Polyvinylferrocene electrode coatings

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By setting the ratio of the oxidized and reduced forms of a redox couple in an electrode coating film to unity, the potential of this electrode in an inert electrolyte is poised at the half-wave potential of the couple. This has indeed been shown for platinum wires coated with polyvinylferrocene or ferrocene modified polypyrrole But the long term stability of these electrodes during cell connection... 

Whilst it is agreed that electron transport within polymer supported ferrocene involves ferrocene-ferrocenium electron hopping and requires no participation from the organic framework, recent studies of electron transfer to a substrate in solution indicate that this need not be mediated by iron(II/III) hopping. Thus X-ray photoelectron spectroscopy gave no evidence for unexposed platinum on an electrode coated with polyvinylferrocene, but scannii electron microscopy revealed channels in the polymer layer. It was concluded that the reactant could either diffuse through such channels or pinholes to the electrode surface, or indeed diffuse through the polymer matrix. These possibilities are illustrated in equation (33). 

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