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李斌川,李师居,孔亚鹏,陈建设,刘奎仁,韩庆.CeO2在CeF3–LiF–BaF2熔盐中的溶解过程及电化学行为研究[J].稀有金属材料与工程(英文),2020,49(3):749~754.[Li Binchuan,Li Shiju,Kong Yapeng,Chen Jianshe,Liu Kuiren and 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.]
The dissolution and electrochemical behaviour of CeO2 in molten CeF3–LiF–BaF2
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Received:October 30, 2018  Revised:November 26, 2018
DOI:
Key words: Cerium  Molten ?uorides  CeF3–LiF–BaF2  CeO2  Electrodeposition
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Li Binchuan,Li Shiju,Kong Yapeng,Chen Jianshe,Liu Kuiren and Han Qing  
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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.