Cyclic Voltammetry on Zirconium Redox Reactions in LiCl-KCl-ZrCl4 at 500 degrees C for Electrorefining Contaminated Zircaloy-4 Cladding

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This study examines zirconium electrochemical redox behaviors in LiCl-KCl-ZrCl4 at 500 degrees C. Cyclic voltammetries are conducted with tungsten working and counter electrode. Four oxidation peaks and three reduction peaks are observed and redox reactions which could contribute to each peak are determined based on electrolysis results and peak height changes of cyclic voltammogram according to scan rates and ranges. Zr(IV) could be reduced into ZrCl when cathode potential is more negative than -1.1 V (vs. 1 wt% Ag/AgCl) and ZrCl would be reduced into Zr metal if cathode potential become more negative than -1.2 V. ZrCl and Zr metal could be oxidized into mainly Zr(IV) in LiCl-KCl-ZrCl4(1 wt%). Zr(II) could exist in the molten salt but the concentration might be small because heights of cyclic voltammogram peaks related to redox reactions of Zr(II) are relatively small. Based on cyclic voltammetry results, suggestions for the electrorefining of irradiated Zircaloy-4 cladding are proposed. High cathodic current density is preferred to recover zirconium as a metal state and low anodic current density is required to prevent dissolution of elements which are more reductive than zirconium. (C) 2013 The Electrochemical Society. All rights reserved.
Publisher
ELECTROCHEMICAL SOC INC
Issue Date
2014-01
Language
English
Article Type
Article
Citation

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.161, no.3, pp.H97 - H104

ISSN
0013-4651
DOI
10.1149/2.046403jes
URI
http://hdl.handle.net/10203/225869
Appears in Collection
NE-Journal Papers(저널논문)
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