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Preparation of Co-Sn alloys by electroreduction of Co(II) and Sn(II) in molten LiCl-KCl

Identifieur interne : 000631 ( Main/Curation ); précédent : 000630; suivant : 000632

Preparation of Co-Sn alloys by electroreduction of Co(II) and Sn(II) in molten LiCl-KCl

Auteurs : H. Groult [France] ; H. El Ghallali [France, Maroc] ; A. Barhoun [Maroc] ; E. Briot [France] ; L. Perrigaud [France] ; S. Hernandorena [France] ; F. Lantelme [France]

Source :

RBID : Pascal:10-0269538

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English descriptors

Abstract

Co-Sn alloys were prepared by an electrochemical route in molten LiCl-KCl between 400 and 550 °C. The Sn(IV)/Sn(II), Sn(II)/Sn(0) and Co(II)/Co(0) redox couples were studied by cyclic voltammetry and/or chronopotentiometry over the temperature range. The diffusion coefficient values of Co(II) ions were measured. For example, it was found that the DCo(II) values deduced from chronopotentiometry range from DCo(II) = 1.65 x 10-5 cm2 s-1 at 400°C to 4.95 × 10-5 cm2 s-1 at 550°C. The standard potential of the Co(II)/Co(0) redox couple in molten LiCl-KCl was measured at 400°C: E0Co(II)/Co(0) = -1.35 V vs Cl2/Cl-. Finally, Co-Sn alloys were prepared in potentiostatic mode. The influence of the temperature of molten LiCl-KCl, the applied potential and the deposition time on the morphology and the composition of the Co-Sn alloys were also investigated. For T > 450°C, the following tendency has been observed: the more negative the potential, the higher the Sn content in the deposited alloy. Thus, depending on the operating conditions, pure CoSn or CoSn2 can be prepared.

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Pascal:10-0269538

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<term>Lithium Chlorure</term>
<term>Réduction chimique</term>
<term>Cobalt alliage</term>
<term>Etain alliage</term>
<term>Sel fondu</term>
<term>Electrolyte fondu</term>
<term>Alliage binaire</term>
<term>Dépôt électrolytique</term>
<term>Cobalt II Composé</term>
<term>Etain II Composé</term>
<term>Effet température</term>
<term>Electrode</term>
<term>Carbone</term>
<term>Etat vitreux</term>
<term>Molybdène</term>
<term>Microscopie électronique balayage</term>
<term>Diffraction RX</term>
<term>Réaction électrochimique</term>
<term>Condition opératoire</term>
<term>Structure surface</term>
<term>Morphologie</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr">
<term>Carbone</term>
<term>Molybdène</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front>
<div type="abstract" xml:lang="en">Co-Sn alloys were prepared by an electrochemical route in molten LiCl-KCl between 400 and 550 °C. The Sn(IV)/Sn(II), Sn(II)/Sn(0) and Co(II)/Co(0) redox couples were studied by cyclic voltammetry and/or chronopotentiometry over the temperature range. The diffusion coefficient values of Co(II) ions were measured. For example, it was found that the D
<sub>Co</sub>
(II) values deduced from chronopotentiometry range from D
<sub>Co</sub>
(II) = 1.65 x 10
<sup>-5</sup>
cm
<sup>2</sup>
s
<sup>-1</sup>
at 400°C to 4.95 × 10
<sup>-5 </sup>
cm
<sup>2</sup>
s
<sup>-1</sup>
at 550°C. The standard potential of the Co(II)/Co(0) redox couple in molten LiCl-KCl was measured at 400°C: E
<sup>0</sup>
<sub>Co(II)/Co(0)</sub>
= -1.35 V vs Cl
<sub>2</sub>
/Cl
<sup>-</sup>
. Finally, Co-Sn alloys were prepared in potentiostatic mode. The influence of the temperature of molten LiCl-KCl, the applied potential and the deposition time on the morphology and the composition of the Co-Sn alloys were also investigated. For T > 450°C, the following tendency has been observed: the more negative the potential, the higher the Sn content in the deposited alloy. Thus, depending on the operating conditions, pure CoSn or CoSn
<sub>2</sub>
can be prepared.</div>
</front>
</TEI>
</record>

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