Electrochemical behaviour of plutonium ion in LiCl–KCl eutectic melts

Serp, Jérôme; Konings, R.J.M.; Malmbeck, Rikard; Jean, Rebizant; Scheppler, C; Glatz, Jean‐Paul

doi:10.1016/j.jelechem.2003.07.027

Cited by 113 publications

(91 citation statements)

References 24 publications

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“…The electrolytic bath was prepared by oxidising the Th with a known amount of BiCl 3 dissolved in the salt, as described in [1]. Five different Th concentrations (between 0.20 wt% and 1.46 wt%) were prepared by successive additions of BiCl 3 .…”

Section: Methodsmentioning

confidence: 99%

“…This behaviour is rather unexpected, since most of the other actinides have shown a reversible behaviour at low scan range, typically below 200 mV.s -1 [1][2][3].…”

Section: Reduction Mechanismmentioning

confidence: 95%

“…Previous work performed in ITU concerned the study of the electrochemical properties of U, Pu, Np and Am cations in a LiCl-KCl eutectic molten salt [1][2][3]. Transient electrochemical techniques were used to determine the diffusion coefficient of the dissolved actinide ions, as well as their redox potentials.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemistry of thorium in LiCl–KCl eutectic melts

Cassayre¹,

Serp²,

Souček³

et al. 2007

Electrochimica Acta

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This work presents a study of the electrochemical properties of Th chloride ions dissolved in a molten LiCl-KCl eutectic, in a temperature range of 693-823 K. Transient electrochemical techniques such as cyclic voltammetry and chronopotentiommetry have been used in order to investigate the reduction mechanism on a tungsten electrode and the diffusion coefficient of dissolved Th ions. All techniques showed that only one valence state was stable in the melt.The reduction into Th metal was found to occur according to a one-step mechanism, through an irreversible reaction controlled by a nucleation process which requires an overpotential of several 100 mV. At 723 K, the diffusion coefficient is D Th(723K) = 3.7 ± 0.2·10 -5 cm 2 .s -1 . EMF measurements indicated that, at 723 K, the standard apparent potential is 0(723 K) = -2.582 V vs. Cl 2 /Cl -, and the activity coefficient γ ThCl4 (723 K) = 8·10 -3 on the mole fraction scale (based on a pure liquid reference state).

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Section: Methodsmentioning

confidence: 99%

“…This behaviour is rather unexpected, since most of the other actinides have shown a reversible behaviour at low scan range, typically below 200 mV.s -1 [1][2][3].…”

Section: Reduction Mechanismmentioning

confidence: 95%

See 1 more Smart Citation

Electrochemistry of thorium in LiCl–KCl eutectic melts

Cassayre¹,

Serp²,

Souček³

et al. 2007

Electrochimica Acta

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“…Later Martinot reported the apparent standard potentials of the redox systems of the actinide series (U, Pu, Np, Am, Cm) [7]. In the last decade re-assessments of the thermochemical properties of actinide chloride solutions have been undertaken: U [4, 8 -13], Pu [10,14,15], Am [10, 16 -0932-0784 / 08 / 0100-0107 $ 06.00 c 2008 Verlag der Zeitschrift für Naturforschung, Tübingen · http://znaturforsch.com 21], Np [10, 22 -24]. Also at the Institute for Transuranium Elements (ITU), Karlsruhe, Germany, systematic electrochemical studies on actinides in the molten eutectic LiCl-KCl have been initiated.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Thermochemical Properties of Actinides in Molten Chlorides

Masset

Apostolidis

Malmbeck

et al. 2008

Zeitschrift Für Naturforschung A

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The electrochemical properties of the chlorides of the actinides U, Pu, Np and Am (AnCl 3 ) were investigated by transient electrochemical techniques in the LiCl-KCl eutectic at 400 -550 • C. The diffusion coefficients of the cations and the apparent standard potentials of the redox systems on an inert W electrode were measured. The Gibbs energy of dilute solutions of AnCl 3 as well as the activity coefficients were derived from electrochemical measurements. In addition, the electrochemical behaviour of the actinides on an Al electrode was investigated. They formed AnAl 4 alloys, the formation potentials of which allowed a quantitative recovery of the actinides and their separation from fission products and especially from lanthanides. In addition, the thermochemical properties of the AnAl 4 alloys were determined by electrochemical measurements.

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“…Special attention is devoted to rare earth elements (REE) mainly due to its neutronic poison effect and the high content into the spend fuel. In addition, REE have similar chemical properties [Bermejo et al, 2006[Bermejo et al, , 2007[Bermejo et al, , 2008a[Bermejo et al, , 2008bCastrillejo et al, 2005aCastrillejo et al, , 2005bCastrillejo et al, , 2005cCastrillejo et al, , 2009De Cordoba et al, 2004Kuznetsov et al, 2006;Smolenski et al, 2008aSmolenski et al, , 2008b] to those of actinides [Fusselman et al, 1999;Morss, 2008;Osipenko et al, 2010Osipenko et al, , 2011Roy et al, 1996;Sakamura et al, 1998;Serp et al, 2004Serp et al, , 2005aSerp et al, , 2005bSerp et al, , 2006Serrano & Taxil, 1999;Shirai et al, 2000] hence separation between these groups of elements is very difficult. For this reason, a good knowledge of the basic properties of REE in the proposed separation media is very important.…”

Section: Introductionmentioning

confidence: 99%