Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Cathodic Processes in Uranium Containing Molybdate Melts
AU - Volkovich, V.
AU - Smolenski, V.
AU - Ryzhov, A.
AU - Kitik, M.
AU - Chukin, A.
AU - Osipenko, A.
AU - Novoselova, A.
AU - Polovov, I.
AU - Poglyad, S.
N1 - This study was in part funded by Research Institute of Atomic Reactors through the Agreements 420/2020/64/16738-D and 64/20559-D. The authors are grateful to Dr. D.G. Lisienko (Department of Physical and Chemical Methods of Analysis, Ural Federal University) for performing ICP-MS analysis.
PY - 2023/7/1
Y1 - 2023/7/1
N2 - Cathodic processes in Li2MoO4–K2MoO4–MoO3 and K2MoO4–MoO3 melts containing added UO2MoO4 were investigated at 550–800 °C using cyclic voltammetry, cathodic polarization and bulk electrolysis. Cathodic reduction of molybdate melts (not containing uranium) resulted in formation of molybdenum dioxide. Products of the cathodic reactions in the melts containing uranium molybdate predominantly consisted of crystalline uranium oxides (mostly UO2 and U4O9) and MoO2. Minor products formed included other uranium oxides (U3O8, U13O34), mixed uranium-molybdenum oxides (U1.5Mo10O32, Mo2UO8) and molybdates (provisionally attributed to K2U(MoO4)3). Effect of temperature, cathodic current density 0.05–1 A cm−2), excess MoO3 concentration (30–50 mol%) on the composition of the cathodic reaction products were analyzed. Oxygen-to-uranium atomic ratio (oxygen coefficient) for primary uranium oxide phases was determined and varied from 1.963 to 2.161 for UO2±x and from 2.209 to 2.287 for U4O9±y. The effect of the electrolysis regime on the composition of the cathodic product was also considered. Constant-current and constant-potential electrolysis, as well pulsed-current, pulsed-potential and pulsed-reversed-current electrolysis were investigated with varying the parameters of alternating pulses (duration, current density or potential). Chemical and phase composition of the products produced by bulk electrolysis was fully characterized.
AB - Cathodic processes in Li2MoO4–K2MoO4–MoO3 and K2MoO4–MoO3 melts containing added UO2MoO4 were investigated at 550–800 °C using cyclic voltammetry, cathodic polarization and bulk electrolysis. Cathodic reduction of molybdate melts (not containing uranium) resulted in formation of molybdenum dioxide. Products of the cathodic reactions in the melts containing uranium molybdate predominantly consisted of crystalline uranium oxides (mostly UO2 and U4O9) and MoO2. Minor products formed included other uranium oxides (U3O8, U13O34), mixed uranium-molybdenum oxides (U1.5Mo10O32, Mo2UO8) and molybdates (provisionally attributed to K2U(MoO4)3). Effect of temperature, cathodic current density 0.05–1 A cm−2), excess MoO3 concentration (30–50 mol%) on the composition of the cathodic reaction products were analyzed. Oxygen-to-uranium atomic ratio (oxygen coefficient) for primary uranium oxide phases was determined and varied from 1.963 to 2.161 for UO2±x and from 2.209 to 2.287 for U4O9±y. The effect of the electrolysis regime on the composition of the cathodic product was also considered. Constant-current and constant-potential electrolysis, as well pulsed-current, pulsed-potential and pulsed-reversed-current electrolysis were investigated with varying the parameters of alternating pulses (duration, current density or potential). Chemical and phase composition of the products produced by bulk electrolysis was fully characterized.
UR - https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=tsmetrics&SrcApp=tsm_test&DestApp=WOS_CPL&DestLinkType=FullRecord&KeyUT=001020659000001
UR - http://www.scopus.com/inward/record.url?partnerID=8YFLogxK&scp=85164926167
U2 - 10.1149/1945-7111/ace080
DO - 10.1149/1945-7111/ace080
M3 - Article
VL - 170
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
SN - 0013-4651
IS - 7
M1 - 072502
ER -
ID: 41602501