CHARGE PROPAGATION IN [OS(BYP)(2)(PVP)(X)CL]CL POLYMERS - AN EXAMPLE OF MEAN-FIELD BEHAVIOR IN A SYSTEM WITH CONSTRAINED DIFFUSION OF REDOX SITES
1995 (English)In: Journal of Electroanalytical Chemistry, ISSN 0022-0728, E-ISSN 1873-2569, Vol. 381, no 1-2, 133-142 p.Article in journal (Refereed) PublishedText
Chronocoulometry and impedance spectroscopy were used to study the dynamics of charge transport in a series of methylated [Os(bpy)(2)(PVP)(x)Cl]Cl polymers (PVP = poly(4-vinylpyridine); bpy = 2,2'-bipyridine; 5 less than or equal to x less than or equal to 40) which were deposited as thin firms on glassy carbon electrodes. Apparent charge propagation diffusion coefficients D-app were of the order of 10(-8) cm(2) s(-1) and were approximately linearly dependent on the total concentration of redox sites but independent of the ratio of oxidized to reduced centres present in a particular coating. Attempts were made to explain these observations in terms of a recent theory of charge transport appropriate for systems in which the redox sites are permanently attached to the polymer chains. It was found that the concentration dependence and magnitude of D-app could be explained satisfactorily by a mean field model of charge propagation.
Place, publisher, year, edition, pages
1995. Vol. 381, no 1-2, 133-142 p.
MEAN FIELD MODEL, REDOX POLYMERS
Analytical Chemistry Physical Chemistry
IdentifiersURN: urn:nbn:se:umu:diva-112730DOI: 10.1016/0022-0728(94)03654-LISI: A1995QE04200019OAI: oai:DiVA.org:umu-112730DiVA: diva2:882305