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Ouchi, Kazuki; Otobe, Haruyoshi; Kitatsuji, Yoshihiro
no journal, ,
We investigated the deposition following the electrolytic reduction of uranium by measuring electrochemical quartz crystal microbalance. On voltammogrm of U(VI), the reduction wave of U(VI) to U(V) was observed in -0.2 V and deposits was not detected. Deposits were detected in the reduction wave of -0.5 V. When potential shifted negatively, deposition was forming until observation of oxidation. After that oxidative dissolution of deposits was observed. We estimated species of deposits from relationship between quantity of electricity and deposition amount. This deposition mechanism is highly likely to form U(IV) hydroxide (U(OH)
) as an intermediate and transform to U(IV) oxide (UO
).
Ouchi, Kazuki; Otobe, Haruyoshi; Kitatsuji, Yoshihiro
no journal, ,
In this study, we investigated the change on standing of deposition amount and the catalysis by the deference of deposit states to obtain knowledge of the reactivity of electrodeposited U(IV). From the change of deposition amount, we found that the decrease of U deposits is caused by oxidative dissolution. Next, the rates of the reduction and deposition of U on the electrode surface deposited U deposits in various states were measured. From those results, we found that U deposits in more stable state have better catalytic activity.
