Elucidation of Electrode Reaction of EuCl<sub>3</sub>in LiCl-KCl Eutectic Melts through CV Curve Analysis

Kim, Tack-Jin; Jung, Yongju; Kim, Si-Hyung; Paek, Seungwoo; Ahn, Do-Hee

doi:10.5012/bkcs.2011.32.3.863

Cited by 16 publications

(10 citation statements)

References 18 publications

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“…Measured formal potential was comparable with those in literatures by taking different concentrations of AgCl in the reference electrode into account. 4,22,23 The absorption spectra were measured in combination with excess oxidative electrolysis at constant potential of 0.950 V vs. Ag/Ag + to get the pure absorption spectrum of Eu(III) irrespective of adding EuCl 3 into the LiCl-KCl chloride eutectic. The electrolysis proceeded until the spectra were not transiently changed any more.…”

Section: Resultsmentioning

confidence: 99%

Reduction of Trivalent Europium in Molten LiCl-KCl Eutectic Observed by In-Situ Laser Spectroscopic Techniques

Kim

Yun

2013

ECS Electrochemistry Letters

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The in-situ quantification for the reduction of Eu(III) was performed in the LiCl-KCl eutectic at various temperatures by time-resolved laser fluorescence spectroscopy (TRLFS) and UV-Vis absorption spectroscopy. From the results of absorption measurement, Eu(III) virtually underwent complete reduction to Eu(II) under the present experimental conditions, while TRLFS revealed a relatively greater reducing power of Eu(III) in the chloride molten eutectic with decreasing its concentration and increasing temperature. However, it was convincingly identified that fluorescence measurements deliver more reliable quantification, compared with the UV-Vis absorption measurements, showing a mutually hindered overlap of absorption bands of Eu(II) and Eu(III).The molten chloride salt is one of the ionic liquid solvents used in the electrorefining and electrowinning of pyrochemical process for recycling used nuclear fuel. Over the past decade, thermodynamic and electrochemical behaviors of actinides and lanthanides in molten chloride salts have been investigated to understand fundamental knowledge and reaction mechanism. 1 An efficient separation of some lanthanides is essential due to their high neutron capture crosssection. Particularly, europium is an attractive and motivating element among lanthanides because of its presence in the multiple oxidation state. Although most lanthanides exist in the trivalent valence state in molten salts, europium can be present in the mixed valence states of Eu(II) and Eu(III) which are likely to cause circulating current in the electrolysis process. 2,3 For that reason, the efficiency of electrolysis during electrorefining and electrowinning process is undoubtedly affected by circulation current arising from alternate reduction and redox reactions at the electrode.The thermodynamic properties of europium ions in molten alkali chloride salt have been studied by electrochemical methods. 3-8 The qualitative and quantitative analysis of reduction of europium from Eu(III) to Eu(II) has been performed in molten alkali chloride salts by electrochemical method, 9,10 absorption spectroscopy, 10 and electron paramagnetic resonance (EPR) technique. 11 Nevertheless, there has been still a relatively large discrepancy of the reducing capacity of europium in chloride molten salts reported in literatures. Kim et al. 10 reported that around 20% of Eu(III) was reduced to Eu(II) at 5.4 × 10 −4 M by absorption spectroscopy and electrochemical analysis in high temperature, and Park et al. 11 observed that approximately 50% of Eu(III) was reduced to Eu(II) measured by EPR technique at room temperature after solidification of molten salt samples. This divergent result requires the reliable technique for in situ quantitative analysis of reduction of trivalent europium. Recently, several groups have measured the fluorescence spectrum of Eu(II) in LiCl-KCl eutectic at various temperatures, 11-13 whereas the fluorescence spectrum of Eu(III) have not been observed in high-temperature LiCl-KCl eutectic. The fluorescen...

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Section: Resultsmentioning

confidence: 99%

Reduction of Trivalent Europium in Molten LiCl-KCl Eutectic Observed by In-Situ Laser Spectroscopic Techniques

Kim

Yun

2013

ECS Electrochemistry Letters

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“…The diffusion coefficients of EuCl3 in molten LiCl-KCl salt are studied by CV, CP and other methods [31,36,37]. The diffusion coefficient of Eu 2+ is also studied and summarized in Table A…”

Section: Neup-14-6489 11 Of 162mentioning

confidence: 99%

Rare Earth Electrochemical Property Measurements and Phase Diagram Development in a Complex Molten Salt Mixture for Molten Salt Recycle

Zhang

Guo

2018

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“…The electrowinning process developed at KAERI consists of three steps ( Figure 12): (i) LCC electrowinning for simultaneous recovery of U and TRU using an LCC, (ii) residual actinide recovery (RAR) process for recovery of the residual low-concentration U/TRU in the salt after the LCC electrowinning process, and (iii) Cd distillation of the cathode product (i.e., Cd ingot including the U/TRU deposits) produced from the LCC electrowinning and the RAR processes. The essential technologies that include the development of effective LCC structure [7], RAR methods [8], analytical technologies [9], and computational model of electrowinning cell [10] have been developed to enhance the operation efficiency of electrowinning process. In order to demonstrate the developed technologies, the engineering-scale electrowinning system of PRIDE was established.…”

Section: Electrowinning Systemmentioning

confidence: 99%

Current Status of Pyroprocessing Development at KAERI

Lee

Park

Lee

et al. 2013

Science and Technology of Nuclear Installations

103

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Pyroprocessing technology has been actively developed at Korea Atomic Energy Research Institute (KAERI) to meet the necessity of addressing spent fuel management issue. This technology has advantages over aqueous process such as less proliferation risk, treatment of spent fuel with relatively high heat and radioactivity, and compact equipments. This paper describes the pyroprocessing technology development at KAERI from head-end process to waste treatment. The unit process with various scales has been tested to produce the design data associated with scale-up. Pyroprocess integrated inactive demonstration facility (PRIDE) was constructed at KAERI and it began test operation in 2012. The purpose of PRIDE is to test the process regarding unit process performance, remote operation of equipments, integration of unit processes, scale-up of process, process monitoring, argon environment system operation, and safeguards-related activities. The test of PRIDE will be promising for further pyroprocessing technology development.

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Elucidation of Electrode Reaction of EuCl₃in LiCl-KCl Eutectic Melts through CV Curve Analysis

Cited by 16 publications

References 18 publications

Reduction of Trivalent Europium in Molten LiCl-KCl Eutectic Observed by In-Situ Laser Spectroscopic Techniques

Reduction of Trivalent Europium in Molten LiCl-KCl Eutectic Observed by In-Situ Laser Spectroscopic Techniques

Rare Earth Electrochemical Property Measurements and Phase Diagram Development in a Complex Molten Salt Mixture for Molten Salt Recycle

Current Status of Pyroprocessing Development at KAERI

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Elucidation of Electrode Reaction of EuCl3in LiCl-KCl Eutectic Melts through CV Curve Analysis

Cited by 16 publications

References 18 publications

Reduction of Trivalent Europium in Molten LiCl-KCl Eutectic Observed by In-Situ Laser Spectroscopic Techniques

Reduction of Trivalent Europium in Molten LiCl-KCl Eutectic Observed by In-Situ Laser Spectroscopic Techniques

Rare Earth Electrochemical Property Measurements and Phase Diagram Development in a Complex Molten Salt Mixture for Molten Salt Recycle

Current Status of Pyroprocessing Development at KAERI

Contact Info

Product

Resources

About

Elucidation of Electrode Reaction of EuCl₃in LiCl-KCl Eutectic Melts through CV Curve Analysis