Interfacial tension and fluorine evolution on a carbon anode |
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Authors: | Frédéric Lantelme Henri Groult Bertrand Morel |
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Institution: | a Case 51, Université Pierre et Marie Curie-Paris 6, UMR 7612, 4 place Jussieu, 75252 Paris Cedex 05, France b Comurhex-Cogema, 26701 Pierrelatte Cedex, France c Cogema-Areva, BP 16, 26701 Pierrelatte Cedex, France |
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Abstract: | During electrolysis of molten KF-2HF, strongly adherent fluorine bubbles are generated at the surface of carbon anode. The current was passing even if the horizontal anode was fully covered with gas film. The formation and growth of gas bubbles were studied by transient electrochemical techniques. It was observed that the fluorine bubbles do not have the spherical cap shape predicted by the classical theory. The curvature radius of the interface profile is not constant, the edge of the bubble being flat with a contact angle close to zero. The results are interpreted in the frame of a model which takes into account the predominant role of the interfacial properties. |
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Keywords: | Modelling Gas evolution Molten salts Surface tension Fluorine KF-2HF |
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