Journal article
Polymer films on electrodes. 8. Investigation of charge-transport mechanisms in Nafion polymer modified electrodes
Journal of the American Chemical Society, Vol.104(18), pp.4811-4817
09/01/1982
DOI: 10.1021/ja00382a013
Abstract
The mechanism of charge transport through Nafion polymers coated on glassy carbon electrodes and containing Cp2FeTMA+, Ru(bpy)32+, and Os(bpy)32+(where Cp2FeTMA+is [(trimethylammonio)methyl]ferrocene, bpy = 2,2′-bipyridine) is described. The apparent diffusion coefficients, Dapp, of polymer modified electrodes, as measured by conventional electrochemical methods and which can include contributions from intermolecular electron transfer, are compared to the diffusion coefficients of actual mass transport of the electroactive species through the polymer, Dm, as measured from the rate of permeation of the electroactive material. The results indicate that Dapp= Dmfor Cp2FeTMA+, Dapp≃ 2Dmfor Os(bpy)32+, and Dapp= 15Dmfor Ru(bpy)32+. These results are discussed in terms of the Dahms-Ruff model, where the observed diffusional behavior is due to both physical diffusion of the electroactive species and an electron-transfer component that can contribute to the observed behavior. The contribution of the electron-exchange mechanism toward the value of Dappdecreases in the order of electroactive species, Ru(bpy)32+≫ Os(bpy)32+≳ Cp2FeTMA+. © 1982, American Chemical Society. All rights reserved.
Details
- Title: Subtitle
- Polymer films on electrodes. 8. Investigation of charge-transport mechanisms in Nafion polymer modified electrodes
- Creators
- Henry S WhiteJohna LeddyAllen J Bard
- Resource Type
- Journal article
- Publication Details
- Journal of the American Chemical Society, Vol.104(18), pp.4811-4817
- Publisher
- American Chemical Society
- DOI
- 10.1021/ja00382a013
- ISSN
- 0002-7863
- eISSN
- 1520-5126
- Language
- English
- Date published
- 09/01/1982
- Academic Unit
- Chemistry
- Record Identifier
- 9984216715402771
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