Impact of Ag on Electrochemical Recovery of UO2 in Molten LiCl-KCl Salt
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Published:2023-09-01
Issue:9
Volume:170
Page:092506
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ISSN:0013-4651
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Container-title:Journal of The Electrochemical Society
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language:
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Short-container-title:J. Electrochem. Soc.
Author:
Han WeiORCID,
Lan Xiaohui,
Zhang Yongqiang,
Liu Rugeng,
Zhang MengORCID,
Wang Ji,
Sun Yang,
Li Mei
Abstract
To investigate the effect of fission element Ag on the electrochemical recovery of UO2, the electroreduction mechanisms of Ag+ and
UO
2
2
+
,
kinetic property of Ag+/Ag couple were first studied on W electrode by different electrochemical techniques. The electrode reactions of Ag+ and
UO
2
2
+
were found to be one-step and two-step reduction processes, respectively. The exchange current density of Ag+/Ag couple was estimated to be 0.0431∼0.0727 A cm−2 in the temperature range of 723∼798 K by LP technique, and its activation energy was evaluated to be 33.91 kJ mol−1. The deposition products obtained by constant potential electrolysis (CPE) were characterized by XRD and SEM-EDS, which showed the formed Ag and UO2 having pine-branch and micron-scale polyhedral structure, respectively. The influence of Ag+ on the electrochemical behavior of
UO
2
2
+
and morphology of UO2 were studied. The deposition potential of Ag+ was close to that of
UO
2
+
to UO2. The changes of Ag+ concentration and scan rate had no effect on the electroreduction mechanism of
UO
2
2
+
.
CPE was conducted, and the result indicated that UO2 and Ag could be co-deposited. The deposited Ag could change the morphology of recovered UO2.
Funder
Fundamental Research Funds for the Central Universities
National Natural Science Foundation of China
Publisher
The Electrochemical Society
Subject
Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials