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Article Dans Une Revue Electrochimica Acta Année : 2011

Direct electroreduction of oxides in molten fluoride salts

Résumé

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.
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hal-03537613 , version 1 (20-01-2022)

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Mathieu Gibilaro, Jacques Pivato, Laurent Cassayre, Laurent Massot, Pierre Chamelot, et al.. Direct electroreduction of oxides in molten fluoride salts. Electrochimica Acta, 2011, 56, pp.5410-5415. ⟨10.1016/j.electacta.2011.02.109⟩. ⟨hal-03537613⟩
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