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On the use of electrochemical techniques to monitor free oxide content in molten fluoride media

Massot, Laurent and Cassayre, Laurent and Chamelot, Pierre and Taxil, Pierre On the use of electrochemical techniques to monitor free oxide content in molten fluoride media. (2007) Journal of Electroanalytical Chemistry, vol. 606 (n° 1). pp. 17-23. ISSN 0022-0728

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Official URL: http://dx.doi.org/10.1016/j.jelechem.2007.04.005

Abstract

The electrochemical behaviour of oxide ions has been studied in fluoride melts(LiF/NaF eutectic) by cyclic voltammetry, square wave voltammetry and chronopotentiometry. The purpose is to determine whether these techniques can be used for titration of free oxide ions (O2-) in molten fluorides released by lithium oxide additions. Cyclic voltammetry is shown to be unsuitable for this purpose due to oxygen bubbling disturbing the oxidation peak, while square wave voltammetry is far more appropriate because the observed signal is a well defined oxidation peak with a height proportional to the oxide content. Thus, the present work is focused on a strategy of oxide ions titration by square wave voltammetry. In addition, this work allows assessing that the electrochemical reduction of oxide ions proceeds by diffusion of these species, and the O2- diffusion coefficient is estimated by chronopotentiometry.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Journal of Electroanalytical Chemistry website : http://www.sciencedirect.com/science/journal/00220728
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Hélène Dubernard
Deposited On:22 Oct 2008 13:21

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