NickelMaghrebV1, France, Analysis, bibRecord, 000125

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

Identifieur interne : 000125 ( France/Analysis ); précédent : 000124; suivant : 000126

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

Auteurs : A. Saila [Algérie] ; M. Gibilaro [France] ; L. Massot [France] ; P. Chamelot [France] ; P. Taxil [France] ; A. M. Affoune [Algérie]

Source :

Journal of electroanalytical chemistry : (1992) [ 1572-6657 ] ; 2010.

RBID : Pascal:10-0315993

Descripteurs français

Pascal (Inist)
- Dysprosium III Fluorure, Lithium Fluorure, Calcium Fluorure, Molybdène, Cuivre, Electrode, Nickel, Voltammétrie cyclique, Onde carrée, Sel fondu, Electrolyte fondu, Chronopotentiométrie, Voltammétrie, Dépôt électrolytique, Dysprosium Alliage, Nickel Alliage, Cuivre Alliage, Alliage binaire, Microscopie électronique balayage, Structure surface, Réaction électrochimique, Morphologie.
Wicri :
- topic : Molybdène, Cuivre, Nickel.

English descriptors

KwdEn :
- Binary alloy, Calcium Fluorides, Chronopotentiometry, Copper, Copper Alloys, Cyclic voltammetry, Dysprosium Alloys, Dysprosium III Fluorides, Electrochemical reaction, Electrodeposition, Electrodes, Lithium Fluorides, Molten electrolyte, Molten salt, Molybdenum, Morphology, Nickel, Nickel Alloys, Scanning electron microscopy, Square wave, Surface structure, Voltammetry.

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: Dy(III) + 3e^- ↔ Dy. 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.

Affiliations:

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Pascal:10-0315993

Le document en format XML

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<term>Cyclic voltammetry</term>
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<term>Dysprosium III Fluorides</term>
<term>Electrochemical reaction</term>
<term>Electrodeposition</term>
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<term>Dépôt électrolytique</term>
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<term>Nickel Alliage</term>
<term>Cuivre Alliage</term>
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<front><div type="abstract" xml:lang="en">The electrochemical behaviour of dysprosium(III) was investigated in the LiF-CaF<sub>2</sub>
 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: Dy(III) + 3e<sup>-</sup>
 ↔ Dy. 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.</div>
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Electrochemical behaviour of dysprosium(III) in LiF-CaF2 on Mo, Ni and Cu electrodes

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

Source :

Descripteurs français

English descriptors

Abstract

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Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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