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Reaction, diffusion and migration in conducting polymer electrodes: analysis of the steady-state amperometric response |
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| Authors: | Michael E. G. Lyons Judith Murphy Thomas Bannon Serge Rebouillat |
| Affiliation: | (1) Electroactive Polymer Research Group, Physical Chemistry Laboratory, University of Dublin, Trinity College, Dublin 2, Ireland e-mail: melyons@mail.tcd.ie Tel.: +353-1-6081821, Fax: +353-1-6712826, IE;(2) DuPont Int. S.A., Chemin du Pavillon, P.O. Box 50, CH-1218, le Grand Saconnex, Geneva, Switzerland, CH |
| Abstract: | The processes of reaction, diffusion and electromigration of a charged substrate within an electronically conducting polymer film deposited on an inert supporting electrode are examined in terms of a quantitative analysis and solution of the pertinent differential equations. An analytical expression for the concentration profiles of substrate within the polymer layer is derived and a theoretical expression for the corresponding steady-state amperometric current response is presented. The transport and kinetics of the substrate are discussed in terms of a dimensionless reaction/diffusion parameter γ and a migration/diffusion parameter β. Received: 13 March 1998 / Accepted: 17 July 1998 |
| Keywords: | Conducting polymer electrodes Amperometric chemical sensor Mathematical modelling Electroactive polymer Heterogeneous redox catalysis |
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