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Report No.
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The Chemical state change of electrodeposited U(IV)

Ouchi, Kazuki  ; Kitatsuji, Yoshihiro  ; Otobe, Haruyoshi  ; Kihara, Sorin*

In this study, we investigated the change of the deposition amount on standing to obtain knowledge of the chemical state change of electrodeposited U(IV). After electrolysis was stopped, the U deposits on the electrode surface decreased regardless of the presence or absence of U(VI) ion. When the oxidation potential (+0.2 V) was applied, the decrease of the deposits was faster than that of stopping electrolysis. On the other hand, when the reduction potential (-0.35 V) was applied, the decrease of the deposits was not observed. The decrease rate of deposits applied oxidation potential was very fast soon after the start of electrolysis and turned to be slow subsequently. This suggests that U deposition species transform into U oxide having more stable state electrochemically.

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