Diffusion of viologens in nafion film studied by a combined electrochemical-spectrophotometric method

Alastair M. Hodges; Oddvar Johansen; John W. Loder; Albert W.H. Mau; Joseph Rabani; Wolfgang H.F. Sasse

doi:10.1021/j100168a045

Diffusion of viologens in nafion film studied by a combined electrochemical-spectrophotometric method

Alastair M. Hodges, Oddvar Johansen, John W. Loder, Albert W.H. Mau^*, Joseph Rabani, Wolfgang H.F. Sasse

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

The diffusion of three viologens with differing overall charges has been studied in Nafion-modified electrodes. A new technique based on spectroscopic observation of the monomer/dimer equilibria of the reduced viologens yields apparent diffusion coefficients (D_app) of the radicals in Nafion. D_app is found to be dependent on the concentration of the viologen species. It is proposed that the hydrophilic channels in Nafion play a significant role in determining D_app and that physical diffusion and not electron hopping appears to be the main charge-transport mechanism.

Original language	English
Pages (from-to)	5966-5970
Number of pages	5
Journal	Journal of Physical Chemistry
Volume	95
Issue number	15
DOIs	https://doi.org/10.1021/j100168a045
State	Published - 1991

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title = "Diffusion of viologens in nafion film studied by a combined electrochemical-spectrophotometric method",

abstract = "The diffusion of three viologens with differing overall charges has been studied in Nafion-modified electrodes. A new technique based on spectroscopic observation of the monomer/dimer equilibria of the reduced viologens yields apparent diffusion coefficients (Dapp) of the radicals in Nafion. Dapp is found to be dependent on the concentration of the viologen species. It is proposed that the hydrophilic channels in Nafion play a significant role in determining Dapp and that physical diffusion and not electron hopping appears to be the main charge-transport mechanism.",

author = "Hodges, {Alastair M.} and Oddvar Johansen and Loder, {John W.} and Mau, {Albert W.H.} and Joseph Rabani and Sasse, {Wolfgang H.F.}",

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AU - Hodges, Alastair M.

AU - Johansen, Oddvar

AU - Loder, John W.

AU - Mau, Albert W.H.

AU - Rabani, Joseph

AU - Sasse, Wolfgang H.F.

PY - 1991

Y1 - 1991

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AB - The diffusion of three viologens with differing overall charges has been studied in Nafion-modified electrodes. A new technique based on spectroscopic observation of the monomer/dimer equilibria of the reduced viologens yields apparent diffusion coefficients (Dapp) of the radicals in Nafion. Dapp is found to be dependent on the concentration of the viologen species. It is proposed that the hydrophilic channels in Nafion play a significant role in determining Dapp and that physical diffusion and not electron hopping appears to be the main charge-transport mechanism.

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JO - Journal of Physical Chemistry

JF - Journal of Physical Chemistry

IS - 15

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Diffusion of viologens in nafion film studied by a combined electrochemical-spectrophotometric method

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