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Electrochemical behaviour of dysprosium (III) in LiF–CaF2 on Mo, Ni and Cu electrodes

Saïla, Abdelkader and Gibilaro, Mathieu and Massot, Laurent and Chamelot, Pierre and Taxil, Pierre and Affoune, Abed-Mohamed Electrochemical behaviour of dysprosium (III) in LiF–CaF2 on Mo, Ni and Cu electrodes. (2010) Journal of Electroanalytical Chemistry, vol. 642 (n° 6). pp. 150-156. ISSN 1572-6657

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Official URL: http://dx.doi.org/10.1016/J.JELECHEM.2010.03.002

Abstract

The electrochemical behaviour of dysprosium(III) was investigated in the LiF–CaF2 eutectic mixture on molybdenum, nickel and copper electrodes in the 840–930 °C temperature range using cyclic voltammetry, square wave voltammetry and chronopotentiometry. On Mo electrode, the study showed that Dy(III) ions were reduced into Dy metal in a one-step diffusion-controlled process exchanging three electrons: View the MathML source The diffusion coefficients verify the Arrhenius law, allowing the activation energy to be calculated. The study of the electrochemical reduction of Dy(III) ions on reactive electrodes (Ni, Cu) first by cyclic voltammetry showed that the reduction potential of Dy(III)/Dy on reactive electrodes was observed at more positive values than those on inert electrode and then open-circuit chronopotentiometry put into evidence the formation of intermetallic compounds at more anodic potentials than pure dysprosium. Preparation of alloys layers was finally carried out by intentiostatic electrolyses at underpotential compared to the pure metal deposition; SEM observations of the layer allowed the most stable compounds prepared by this way to be identified.

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 : http://www.sciencedirect.com/science/article/pii/S1572665710000998
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > L'Université 8 MAI 1945 - GUELMA (ALGERIA)
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Deposited By: Audrey LEFEVRE

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