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Electrochemical Investigation of Exchange Current Density of Uranium and Rare-earths Couples (M3+/M0) in LiCl-KCl Eutectic Electrolyte

Author(s)
Kim, KRChoi, SungyeolKim, JGPeak, SGoh, WI
Issued Date
2015-07
URI
https://scholarworks.unist.ac.kr/handle/201301/17524
Fulltext
http://www.electrochemsci.org/papers/vol10/100907660.pdf
Citation
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE, v.10, no.9, pp.7660 - 7670
Abstract
The objective of this work is to use electrochemical techniques to quantify the electrode reaction rate of some rare-earth elements and uranium in a LiCl-KCl eutectic electrolyte at 500oC. The exchange current densities of the oxidation-reduction couples of M3+/M0 (La3+/La0, Ce3+/Ce0, Pr3+/Pr0, Nd3+/Nd0,Gd3+/Gd0, Y3+/Y0, U3+/U0) on a tungsten electrode were measured by applying a linear polarization resistance technique. A region of linear dependence of potential on applied current could be found to describe the reaction rate of oxidation-reduction system. From these measurements, the estimated exchange current density was 0.38 mA/cm2 for uranium, and was within the range of 0.27 to 0.38mA/cm2 for rare-earth elements.
Publisher
ELECTROCHEMICAL SCIENCE GROUP
ISSN
1452-3981
Keyword
Linear polarization resistance techniqueExchange current densityUraniumRare-earthsLiCl-KCl

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