Reduction process of uranium(IV) and uranium(III) in molten fluorides

Hamel, C.; Chamelot, Pierre; Laplace, Annabelle; Walle, E. van; Dugne, O.; Taxil, Pierre

doi:10.1016/j.electacta.2006.11.018

Cited by 72 publications

(35 citation statements)

References 23 publications

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“…2, exhibits an asymmetrical Gaussian signal attributed to the nucleation overpotential, the rise of the current is delayed by the overpotential caused by the solid phase formation. A similar behaviour has been reported for Nd, Am and U [28][29][30][31]. The disturbance of the signal due to the nucleation effect should be resolved if the decreasing part of the peak for measurements of the half peak width is only taken into account [28][29][30][31].…”

Section: Resultssupporting

confidence: 63%

Electrodeposition of Lu on W and Al electrodes: Electrochemical formation of Lu–Al alloys and oxoacidity reactions of Lu(III) in the eutectic LiCl–KCl

Bermejo

Barrado

Martínez

et al. 2008

Journal of Electroanalytical Chemistry

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Section: Resultssupporting

confidence: 63%

Electrodeposition of Lu on W and Al electrodes: Electrochemical formation of Lu–Al alloys and oxoacidity reactions of Lu(III) in the eutectic LiCl–KCl

Bermejo

Barrado

Martínez

et al. 2008

Journal of Electroanalytical Chemistry

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“…26 These results of UF 4 -FLiNaK melt were consistent with the reported researches. 25,26,[28][29][30] For UO 2 F 2 -FLiNaK melt, the anodic peak H 2 ' at 3.48 V in the curve also belonged to the dissolution of Pt electrode and was more positive than that in the blank FLiNaK melt, which might be induced by the passivation of the Pt electrode surface due to the existence of oxidizing UO 2 2+ in the melt. It was found that when the work electrode was passivated, the oxidation potential of passivated electrode could shift positively and the sight anodic current was generated by dissolved passivated film before the oxidation of electrode, 31 which was also observed in UO 2 F 2 -FLiNaK melt as shown in the inset of Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The immersed depth of WE was kept at 3 mm. In order to avoid the generation of U-Pt alloys, 25 W wire was used as WE instead of Pt in the UF 4 (1.5wt%)-FLiNaK melt, and the immersed depth of W wire was kept at 5 mm.…”

Section: Methodsmentioning

confidence: 99%

Electrochemical Behavior of UO₂F₂and Its Electrodeposition from UO₂F₂-FLiNaK Melt

Han

She

Jia

et al. 2018

J. Electrochem. Soc.

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The electrochemical behavior of UO 2 F 2 in LiF-NaF-KF (46.5-11.5-42 mol%, FLiNaK) melt on Pt electrode was investigated at 550 • C by cyclic voltammetry (CV) and square wave voltammetry (SWV). UO 2 F 2 was prepared by the reaction of UF 4 powder and oxygen at 650 • C, and ascertained by X-ray diffraction (XRD) and Raman spectroscopy. It was found that the reduction of UO 2 2+ in FLiNaK exhibited two steps both with one exchanged electron: UO 2 2+ + e − → UO 2 + and UO 2 + + e − → UO 2 , with the CV reduction peak at about 2.02 V and 1.49 V (vs. K + /K), respectively. Both of them were reversible and diffusion-controlled. By means of potentiostatic electrolysis, the product of UO 2 was obtained and the separation ratio of uranium from UO 2 F 2 -FLiNaK melt was approximately 54.5% at 550 • C, which were characterized by XRD and the inductively coupled plasma atomic emission spectrometer (ICP-AES).

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“…They receive much attention due to their diverse but promising applications that range from metal production [1][2][3] , the pyrochemical treatment of nuclear waste [4][5][6][7] , primary or secondary coolants in several concepts of generation IV fission 8 and fusion 9 nuclear reactors, and electricity storage devices 10 . In the context of nuclear applications, the nuclear reactions produce rare earth elements in the core.…”

Section: Introductionmentioning

confidence: 99%

Structure and dynamics in yttrium-based molten rare earth alkali fluorides

Levesque¹,

Sarou‐Kanian²,

Salanne³

et al. 2013

The Journal of Chemical Physics

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The transport properties of molten LiF-YF 3 mixtures have been studied by pulsed field gradient nuclear magnetic resonance spectroscopy, potentiometric experiments, and molecular dynamics simulations. The calculated diffusion coefficients and electric conductivities compare very well with the measurements across a wide composition range. We then extract static (radial distribution functions, coordination numbers distributions) and dynamic (cage correlation functions) quantities from the simulations. Then, we discuss the interplay between the microscopic structure of the molten salts and their dynamic properties. It is often considered that variations in the diffusion coefficient of the anions are mainly driven by the evolution of its coordination with the metallic ion (Y 3+ here). We compare this system with fluorozirconate melts and demonstrate that the coordination number is a poor indicator of the evolution of the diffusion coefficient. Instead, we propose to use the ionic bonds lifetime. We show that the weak Y-F ionic bonds in LiF-YF 3 do not induce the expected tendency of the fluoride diffusion coefficient to converge toward the one of yttrium cation when the content in YF 3 increases. Implications on the validity of the Nernst-Einstein relation for estimating the electrical conductivity are discussed.

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Reduction process of uranium(IV) and uranium(III) in molten fluorides

Cited by 72 publications

References 23 publications

Electrodeposition of Lu on W and Al electrodes: Electrochemical formation of Lu–Al alloys and oxoacidity reactions of Lu(III) in the eutectic LiCl–KCl

Electrodeposition of Lu on W and Al electrodes: Electrochemical formation of Lu–Al alloys and oxoacidity reactions of Lu(III) in the eutectic LiCl–KCl

Electrochemical Behavior of UO₂F₂and Its Electrodeposition from UO₂F₂-FLiNaK Melt

Structure and dynamics in yttrium-based molten rare earth alkali fluorides

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Reduction process of uranium(IV) and uranium(III) in molten fluorides

Cited by 72 publications

References 23 publications

Electrodeposition of Lu on W and Al electrodes: Electrochemical formation of Lu–Al alloys and oxoacidity reactions of Lu(III) in the eutectic LiCl–KCl

Electrodeposition of Lu on W and Al electrodes: Electrochemical formation of Lu–Al alloys and oxoacidity reactions of Lu(III) in the eutectic LiCl–KCl

Electrochemical Behavior of UO2F2and Its Electrodeposition from UO2F2-FLiNaK Melt

Structure and dynamics in yttrium-based molten rare earth alkali fluorides

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Electrochemical Behavior of UO₂F₂and Its Electrodeposition from UO₂F₂-FLiNaK Melt