Electrochemical behavior for preparation of Sm2Fe17 in CaCl2-CaF2-SmCl3 system

Yan, Qi-Cao; Guo, Xing‐Min

doi:10.1016/j.jallcom.2019.03.094

Cited by 8 publications

(3 citation statements)

References 33 publications

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“…Therefore, for recovery of samarium the discharge of Sm(III) on the reactive cathodes with the formation of intermetallic compounds is used. There are a lot of studies on the recovery of samarium with utilization of different cathodes from Cu, 9 Mg, 10,11 Zn,, 12,13 Cd, 14,15 Al, [16][17][18][19][20] Ga, 21,22 Sn,, 23 Bi, 14,15,24,25 Fe, 26,27 Co, [28][29][30] Ni. [30][31][32][33] At the same time, the number of studies devoted to the behavior of the Sm(III)/Sm(II) redox couple is small.…”

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confidence: 99%

Kinetic and Thermodynamic Properties of Samarium Chlorides Dissolved in Alkali Chloride Melts Obtained by Electrochemical Transient Techniques

Kuznetsov

Stulov

Gaune‐Escard

2021

J. Electrochem. Soc.

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The electrochemical behavour of samarium in NaCl-KCl, KCl and CsCl melts have been studied in the temperature range 973–1173 K by different electrochemical methods. The diffusion coefficients (D) of Sm(III) and Sm(II) have been determined by linear sweep voltammetry, chronopotentiometry and chronoamperometry methods. The standard rate constants of charge transfer (k s) for the Sm(III)/Sm(II) redox couple have been calculated on the basis of cyclic voltammetry data using Nicholson’s equation. The nature of working electrode on the standard rate constants of charge transfer for the Sm(III)/Sm(II) redox couple has been studied. The formal redox potentials E * Sm(III)/Sm(II) have been obtained in alkali chloride melts from the cyclic voltammetry data.

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confidence: 99%

Kinetic and Thermodynamic Properties of Samarium Chlorides Dissolved in Alkali Chloride Melts Obtained by Electrochemical Transient Techniques

Kuznetsov

Stulov

Gaune‐Escard

2021

J. Electrochem. Soc.

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“…It is clear that the reduction peak potential of Dy(III) is almost constant as the frequency varies, indicating that the electrode reaction is reversible. In the inset, the peak current is a good linear relationship with the square root of frequency, demonstrating that the deposition of Dy(III) on liquid Zn electrode is controlled by diffusion, and equation can be used to calculate the diffusion coefficient: [ 45,52,53 ]

I_{p} = {nFAC}_{0} \frac{1 - σ}{1 + σ} \sqrt{\frac{italicDν}{π}} σ = \exp ((), \frac{{nFE}_{sw}}{2 RT})

where E sw is the amplitude of SWV (V) and the other physical quantities have the same meaning as mentioned earlier.…”

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confidence: 86%

Electroreduction of Dy(III) assisted by Zn and its co‐deposition with Zn(II) in LiCl–KCl molten salt

Han

et al. 2020

Applied Organom Chemis

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To recover dysprosium (Dy) from LiCl–KCl molten salt, the electrochemical mechanism of Dy(III) on liquid Zn electrode and co‐deposition of Dy(III) and Zn(II) on W electrode were studied using electrochemical methods. Cyclic voltammetry results demonstrated that the redox process of Dy on liquid Zn electrode is reversible and controlled by diffusion. Reverse chronopotentiograms showed that the transition time ratio of reduction and oxidation is ~3:1, revealing the redox of Dy on liquid Zn electrode is a kind of soluble–soluble system: Dy(III) + 3e− = (Dy–Zn)solution. The half‐wave potential of Dy(III) was almost constant with the increase in scanning rate. The electrochemical separation of metallic Dy from the molten salt was performed using constant potential electrolysis, and the product characterized using X‐ray diffraction and scanning electron microscopy–energy‐dispersive X‐ray spectroscopy was the thermodynamic unstable compound DyZn5. Also, the co‐deposition mechanism of Dy(III) and Zn(II) was explored, indicating that Dy(III) could deposit on pre‐deposited Zn and form Dy–Zn compounds: Zn(II) + 2e− = Zn and xDy(III) + yZn + 3xe− = DyxZny. Moreover, the effect of Dy(III) concentration on the formation of Dy–Zn compounds was investigated. The redox peak currents corresponding to different Dy–Zn compounds changed with the increase in Dy(III) concentration. The co‐deposition of Dy(III) and Zn(II) was performed using constant current electrolysis at diverse Dy(III) concentrations. The different Dy–Zn compounds were produced by controlling Dy(III) concentration.

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“…However, it is impossible to directly recovery Sm on inert W electrode due to the deposition potential of Sm(II)/Sm(0) copule is more negative than that of Li(I)/Li(0) couple. Therefore, the extracting variant valence Sm from molten salt was performed on Co, [31][32][33] Fe, 34,35 Ni, [36][37][38] Cu, 39 Mg, 40,41 and Al [42][43][44][45][46] cathode. Nevertheless, the electrochemical behavior and extraction of Sm on liquid Sn electrode have not been reported in molten salt.…”

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confidence: 99%