ELECTROLYTIC REDUCTION
; CYCLIC VOLTAMMETRY
; RENEWABLE ENERGY
; TITANIUM-DIOXIDE
; ECONOMIC-GROWTH
; CLIMATE-CHANGE
; CO2 EMISSIONS
; SPENT-FUEL
; MO
; PRECURSORS
WOS学科分类:
Electrochemistry
; Materials Science, Coatings & Films
WOS研究方向:
Electrochemistry
; Materials Science
英文摘要:
Uranium-molybdenum (U-Mo) alloys especially the gamma-U-Mo phase, with excellent irradiation performance at high temperatures, have been extensively studied as low-enriched-uranium candidate fuels for strengthening nuclear security and nonproliferation worldwide. Herein, we provide a facile method to successfully prepare the gamma-U-Mo alloys (U-10Mo and U-8Mo) directly from oxide precursors via electro-reduction by constant cell voltage electrolysis in LiCl molten salt at 986 K. The reduction mechanism was elucidated through cyclic voltammetry using the metallic cavity electrode (MCE) combined with XRD, SEM and EDS characterizations toward the electrolysis products under different conditions. It was found that the reduction of mixed MoO3-UO2 oxides may take place in three steps. Firstly, MoO3 was reduced to Li4Mo5O12, and then Li4Mo5O12 was converted into Mo. Finally, the U-Mo alloys were formed due to the underpotential deposition of U on the pre-formed Mo. In addition, the effects of cell voltage, sintering temperature and mixture composition on the electrochemical reduction were investigated. The results found that the reduction rate increased with the augmentation of applied potential and the decrease of sintering temperature. Moreover, the favorable composition of the mixed precursor varied from 24 at% to 21 at%. The reduction conversion rate was determined to be 93.7% by ICP and TGA. (C) 2019 The Electrochemical Society.
1.Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China 2.Tsinghua Univ, Inst Nucl & New Energy Technol, Collaborat Innovat Ctr Adv Nucl Energy Technol, Beijing Key Lab Radioact Waste Treatment, Beijing 100084, Peoples R China 3.Chinese Acad Sci, Ningbo Inst Ind Technol, Engn Lab Adv Energy Mat, Ningbo 315201, Zhejiang, Peoples R China
Recommended Citation:
Zhong, Yu-Ke,Liu, Kui,Liu, Ya-Lan,et al. Preparation of gamma-Uranium-Molybdenum Alloys by Electrochemical Reduction of Solid Oxides in LiCl Molten Salt[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY,2019-01-01,166(8):D276-D282