Homogeneous versus heterogeneous catalysis at electrodes modified with a thin –film organic layer : theoretical and experimental study under conditions of square wave voltammetry. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physical Chemistry C Année : 2007

Homogeneous versus heterogeneous catalysis at electrodes modified with a thin –film organic layer : theoretical and experimental study under conditions of square wave voltammetry.

Résumé

Catalytic mechanism at thin film-modified electrodes is studied both theoretically and experimentally under conditions of square-wave voltammetry (SWV). The electrode system considered consists of a solid electrode covered with an electrochemically inactive thin film (e.g. a layer of a water-immiscible organic solvent) containing a neutral redox probe (R1). The modified electrode is immersed into an electrolyte solution (typically aqueous electrolyte solution) that contains a second redox probe (R2), present in a large excess compared to R1. The product of the assumed one-electron electrode reaction O1+, confined within the film, is transformed back to the initial reactant R1 by means of a catalytic redox reaction with the R2. If the permeation of the R2 in the thin film is significant, the catalytic reaction undergoes as a homogeneous process confined within the boundaries of the thin film. Otherwise, the catalytic reaction undergoes as a heterogeneous process involving electron transfer across the interface between the thin film and the electrolyte solution.

Dates et versions

hal-00456710 , version 1 (15-02-2010)

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Valentin Mirceski, Francois Quentel, Maurice L'Her, Catherine Elleouet. Homogeneous versus heterogeneous catalysis at electrodes modified with a thin –film organic layer : theoretical and experimental study under conditions of square wave voltammetry.. Journal of Physical Chemistry C, 2007, 111, pp.8283-8290. ⟨10.1021/jp068880c⟩. ⟨hal-00456710⟩
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