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Modeling of electrocatalysis at polyaniline-modified electrodes: autoacceleration of the process by the reaction product |
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| Authors: | Feliksas Ivanauskas Albertas Malinauskas Liana Stonkien? |
| Institution: | 1. Departmentof Mathematics and Informatics, Vilnius University, Naugarduko Str. 24, 03225?, Vilnius, Lithuania 2. Institute of Chemistry, Center for Physical Sciences and Technology, Go?tauto 9, 01108?, Vilnius, Lithuania 3. Institute of Mathematics and Informatics, Vilnius University, Akademijos Str. 4, 08663?, Vilnius, Lithuania |
| Abstract: | We extend our previous model taking into account a possible autoacceleration mechanism of electrochemical processes. It is supposed that protons generated in an electrochemical oxidation of ascorbate are responsible for an increase of electric conductivity of polyaniline. Accordingly, the current–time profiles have been calculated taking into account a “threshold” value for proton concentration to increase the electric conductivity of polyaniline by one or more orders of magnitude. Different kinds of corresponding profiles, including ones with a sigmoid character and possessing sharp current flashes as well, were obtained and analyzed. |
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