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The dissolution and electrochemical behaviour of CeO2 in molten CeF3–LiF–BaF2
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1.School of Metallurgy, Northeastern University;2.School of Metallurgy,Northeastern University

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    Abstract:

    The dissolution mechanism of CeO2 in molten CeF3–LiF–BaF2 and the electrochemical behavior of Ce(III) on molybdenum electrode in molten CeF3–LiF–BaF2 were investigated. Cyclic voltammetry, chronoamperometry and potentiostatic electrolysis were performed to investigate the reduction mechanism of Ce(III) ions. The products obtained by dissolution reaction and potentiostatic electrolysis were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The results show that CeO2 can dissolve into the fluoride molten salts in the form of CeOF, by reacting with CeF3. Further, cerium oxyfluorides can be directly reduced to cerium metal with a purity of 99.38–99.81 wt% on molybdenum electrode via a reversible three-electron-transfer process, which is controlled by diffusion.

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[Li Binchuan, Li Shiju, Kong Yapeng, Chen Jianshe, Liu Kuiren, Han Qing. The dissolution and electrochemical behaviour of CeO2 in molten CeF3–LiF–BaF2[J]. Rare Metal Materials and Engineering,2020,49(3):749~754.]
DOI:10.12442/j. issn.1002-185X.20181104

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History
  • Received:October 30,2018
  • Revised:November 26,2018
  • Adopted:December 05,2018
  • Online: April 08,2020
  • Published: