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Direct electroreduction of oxides in molten fluoride salts

Gibilaro, Mathieu and Pivato, Jacques and Cassayre, Laurent and Massot, Laurent and Chamelot, Pierre and Taxil, Pierre Direct electroreduction of oxides in molten fluoride salts. (2011) Electrochimica Acta, 56. 5410-5415. ISSN 0013-4686

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Official URL: http://dx.doi.org/10.1016/j.electacta.2011.02.109


A new kind of electrolyte composed of molten fluorides has been evaluated in order to perform a feasibility study of the direct electroreduction reaction. The direct reduction of SnO2 and Fe3O4 was realised in LiF-NaF at 750°C and in LiF-CaF2 at 850°C for TiO2 and TiO. The electrochemical behaviour of these oxides was studied by linear sweep voltammetry: a current corresponding to the oxide reduction was evidenced for TiO2, SnO2 and Fe3O4. After intensiostatic electrolyses, a complete conversion was obtained for all oxides, except TiO, and the structure of reduced Ti and Fe samples had a typical coral-like structure while dense drops of Sn were recovered (Sn is liquid at operating temperature). After TiO electrolysis, a thin external metallic titanium layer was detected, acting as a barrier for the oxide ions diffusion and no complete reduction can be achieved. This could be explained by a Pilling-Bedworth ratio around 1 for Ti/TiO.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://dx.doi.org/10.1016/j.electacta.2011.02.109 The original PDF of the article can be found at Electrochimica Acta website : http://dx.doi.org/10.1016/j.electacta.2011.02.109
HAL Id:hal-03537613
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:26 Mar 2013 13:39

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