Preparation of Co-Sn alloys by electroreduction of Co(II) and Sn(II) in molten LiCl-KCl |
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Authors: | H Groult H El Ghallali A Barhoun L Perrigaud S Hernandorena F Lantelme |
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Affiliation: | a UPMC Univ Paris 06, UMR 7195 PECSA, Physicochimie des Electrolytes, Colloïdes, Sciences Analytiques, F-75005 Paris, France b CNRS, UMR 7195 PECSA, Physicochimie des Electrolytes, Colloïdes, Sciences Analytiques, F-75005 Paris, France c Université Abdelmalek Essaâdi, Faculté des Sciences, LPCIE, 93000 Tétouan, Morocco |
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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 × 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: 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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Keywords: | Tin Co-Sn alloys LiCl-KCl Molten salt Electrodeposition |
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