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Kinetics of solute partitioning into ultrathin Nafion films on electrode surfaces: Theory and experimental measurement
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Bertoncello, Paolo, Ciani, Ilenia, Marenduzzo, Davide and Unwin, Patrick R. (2007) Kinetics of solute partitioning into ultrathin Nafion films on electrode surfaces: Theory and experimental measurement. Journal of Physical Chemistry C, Vol.111 (No.1). pp. 294-302. doi:10.1021/jp0653981 ISSN 1932-7447.
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Official URL: http://dx.doi.org/10.1021/jp065398l
Abstract
A simple voltammetric procedure for measuring the kinetics of slow partitioning processes into thin films is described and applied to determine the transport of trimethylammonium ferrocinium, FA(+), into ultrathin Nafion Langmuir-Schaefer films. By recording cyclic voltammograms for the oxidation of FA(+) as a function of time of a Nafion modified electrode placed in a dilute solution containing FA(+), one can readily measure the uptake of FA(+) into a film. An analytical model for the charge accumulated in the film has been derived for the cases of (i) transport-controlled partitioning; (ii) transport with a kinetic barrier at the film/solution (f/s) interface; and (iii) pure kinetic control. Analysis of experimental data indicates that, in contrast to dropcast Nafion films, there is a significant kinetic barrier at the f/s interface to FA(+) partitioning. The methodology and theory described are generic and could be applied to other chemical systems and detection methods.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry T Technology T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Journal or Publication Title: | Journal of Physical Chemistry C | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 1932-7447 | ||||
Official Date: | 11 January 2007 | ||||
Dates: |
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Volume: | Vol.111 | ||||
Number: | No.1 | ||||
Number of Pages: | 9 | ||||
Page Range: | pp. 294-302 | ||||
DOI: | 10.1021/jp0653981 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
Data sourced from Thomson Reuters' Web of Knowledge
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