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Vesztergom S.,Eotvos Lorand University | Barankai N.,MTA ELTE Research Group in Theoretical Physics | Kovacs N.,Eotvos Lorand University | Ujvari M.,Eotvos Lorand University | And 3 more authors.
Journal of Solid State Electrochemistry | Year: 2016

The subject of this paper is electrical cross-talk, an interference between the current/voltage characteristics of the two working electrodes in four-electrode (generator/collector) systems. Cross-talk arises in electrochemical cells of finite resistance due to the superposition of the electrical fields of the working electrodes, and often causes difficulties in the interpretation of measurement results. In this paper, we present an algorithm for modelling simple generation/collection experiments with a rotating ring–disk electrode (RRDE) immersed into a finite resistance solution of a redox couple. We show that based on the analysis of the Kirchhoff (Laplace) matrix of the simulation mesh, the effect of electrical cross-talk may be accounted for in such experiments. The intensity of cross-talk is found to be heavily influenced by the selection of the reference point for potential measurements; in practice, this is the position of the reference electrode or the tip of the Luggin probe. The devised model is validated by means of a simple and demonstrative experiment.[Figure not available: see fulltext.] © 2016 Springer-Verlag Berlin Heidelberg


Vesztergom S.,Eotvos Lorand University | Barankai N.,MTA ELTE Research Group in Theoretical Physics | Kovacs N.,Eotvos Lorand University | Ujvari M.,Eotvos Lorand University | And 3 more authors.
Electrochemistry Communications | Year: 2016

The electrical cross-talk between the two working electrodes of generator/collector systems is investigated. Digital simulations are carried out to model simple collection experiments with a rotating ring-disk electrode (RRDE) immersed into a finite resistance solution of a redox couple, where electrical cross-talk may arise due to the shared current routes of the two working electrodes. Based on the analysis of the Kirchhoff (Laplace) matrix of the simulation mesh it is demonstrated that the cross-talk effect is heavily influenced by the selection of the reference point for potential measurements; in practice this is the position of the reference electrode or the tip of the Luggin probe. The devised model is validated by means of a simple and demonstrative experiment. © 2016 Elsevier B.V. All rights reserved.

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