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- W4386725077 abstract "To investigate the effect of fission element Ag on the electrochemical recovery of UO 2 , the electroreduction mechanisms of Ag + and <?CDATA ${{rm{UO}}}_{2}^{2+},$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>UO</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> <mml:mo>+</mml:mo> </mml:mrow> </mml:msubsup> <mml:mo>,</mml:mo> </mml:math> kinetic property of Ag + /Ag couple were first studied on W electrode by different electrochemical techniques. The electrode reactions of Ag + and <?CDATA ${{rm{UO}}}_{2}^{2+}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>UO</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> <mml:mo>+</mml:mo> </mml:mrow> </mml:msubsup> </mml:math> 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 UO 2 having pine-branch and micron-scale polyhedral structure, respectively. The influence of Ag + on the electrochemical behavior of <?CDATA ${{rm{UO}}}_{2}^{2+}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>UO</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> <mml:mo>+</mml:mo> </mml:mrow> </mml:msubsup> </mml:math> and morphology of UO 2 were studied. The deposition potential of Ag + was close to that of <?CDATA ${{rm{UO}}}_{2}^{+}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>UO</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> </mml:mrow> </mml:msubsup> </mml:math> to UO 2 . The changes of Ag + concentration and scan rate had no effect on the electroreduction mechanism of <?CDATA ${{rm{UO}}}_{2}^{2+}.$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>UO</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> <mml:mo>+</mml:mo> </mml:mrow> </mml:msubsup> <mml:mo>.</mml:mo> </mml:math> CPE was conducted, and the result indicated that UO 2 and Ag could be co-deposited. The deposited Ag could change the morphology of recovered UO 2 ." @default.
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- W4386725077 date "2023-09-01" @default.
- W4386725077 modified "2023-09-27" @default.
- W4386725077 title "Impact of Ag on Electrochemical Recovery of UO<sub>2</sub> in Molten LiCl-KCl Salt" @default.
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