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Studying the kinetics of the ion transfer across the liquid|liquid interface by means of thin film-modified electrodes

Abstract : The kinetics of the ion transfer across the liquid|liquid interface is studied by means of a thin film-modified electrode in combination with square-wave voltammetry. The thin film-modified electrode consists of an edge plane pyrolytic graphite electrode covered with a thin film of a water immiscible electroinactive organic solvent containing a neutral redox probe and a suitable electrolyte. The overall electrochemical process, proceeding as a coupled electron-ion transfer reaction, is controlled either by the electron transfer across the graphite electrode|organic solvent or by the ion transfer across the organic solvent|aqueous electrolyte interface. The theoretical model enabling to distinguish the rate limiting step is developed. The theory is used to measure the kinetics of ClO4-,NO3-, Cl-, SCN-, Na +, K+, (CH3)4N+, and (C4H9)4N+ across the water|nitrobenzene interface utilizing lutetium bis(tetra-tert- butylphthalocyaninato) as a redox probe. © 2005 Elsevier B.V. All rights reserved.
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https://hal.univ-brest.fr/hal-01763753
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Submitted on : Wednesday, April 11, 2018 - 1:42:49 PM
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V. Mirčeski, François Quentel, Maurice l'Her, A. Pondaven. Studying the kinetics of the ion transfer across the liquid|liquid interface by means of thin film-modified electrodes. Electrochemistry Communications, Elsevier, 2005, 7 (11), pp.1122-1128. ⟨10.1016/j.elecom.2005.08.005⟩. ⟨hal-01763753⟩

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