Accession Number : ADA130557

Title :   Effect of Hydrophobic Interactions on the Rates of Ionic Diffusion in Nafion Films at Electrode Surfaces.

Descriptive Note : Technical rept.,

Corporate Author : TEXAS A AND M UNIV COLLEGE STATION DEPT OF CHEMISTRY

Personal Author(s) : Martin,Charles R ; Dollard,Kathleen A

PDF Url : ADA130557

Report Date : 07 Jul 1983

Pagination or Media Count : 29

Abstract : Results of studies of diffusional charge transport in films of 1100 and 1200 equivalent weight Nafion on glassy carbon electrode surfaces are reported. A comparison of apparent diffusion coefficients for the oxidized and reduced forms of various ionically diffusing redox couples shows that the ratio of these diffusion coefficients is critically dependent on the nature of the diffusing ion. For hydrophobic redox couples, the diffusion coefficient for the more highly charged form was always greater than the diffusion coefficient for the lower charge form (opposite of what is generally observed in aqueous solution). These results are interpreted in terms of the effect of hydrophobic interactions, with the polymer chain material. (Author)

Descriptors :   *Polymeric films, *Electrodes, *Ions, *Diffusion, *Hydrophobic properties, Charge transfer, Glassy carbon, Surfaces, Diffusion coefficient, Oxidation reduction reactions, Coupling(Interaction), Solutions(Mixtures), Sulfonates, Sodium, Cesium, Membranes, Clustering, Polyelectrolytes, Models

Subject Categories : Physical Chemistry
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE