Electrochemical behavior of dysprosium（Ⅲ） in eutectic LiF-DyF3 at tungsten and copper electrodes
来源期刊：Journal of Rare Earths2020年第4期
论文作者：Chunfa Liao Boqing Cai Xu Wang Shumei Chen Gong Chen Jueyuan Lin
文章页码：427 - 435
摘 要：Electrochemical behavior of dysprosium（Dy） ions in LiF-DyF3（24 mol%） was investigated by cyclic voltammetry,chronoamperometry and chronopotentiometry.Dy-Cu alloy samples were prepared by constant-potential electrolysis in LiF-DyF3（24 mol%） at the Cu electrode.The Cu5 Dy and Cu phases were characterized by an X-ray diffractometer and a scanning electron microscope equipped with an energy dispersive spectrometer.The results show that the reduction of Dy（Ⅲ） ions in a LiF-DyF3（24 mol%）molten salt system is found to be a quasi-reversible diffusion-controlled process which occurs via a onestep reaction involving the transfer of three electrons.The electro-crystallization processes of the Dy metal at the W electrode and the mode of nucleation confirm that progressive nucleation is dominant at high concentrations of Dy ions in the LiF-DyF3 salt.At lower concentrations,the instantaneous nucleation of Dy with three-dimensional growth of the nuclei is dominant.
Chunfa Liao，Boqing Cai，Xu Wang，Shumei Chen，Gong Chen，Jueyuan Lin
Faculty of Materials,Metallurgy and Chemistry,Jiangxi University of Science and Technology
摘 要：Electrochemical behavior of dysprosium（Dy） ions in LiF-DyF3（24 mol%） was investigated by cyclic voltammetry,chronoamperometry and chronopotentiometry.Dy-Cu alloy samples were prepared by constant-potential electrolysis in LiF-DyF3（24 mol%） at the Cu electrode.The Cu5 Dy and Cu phases were characterized by an X-ray diffractometer and a scanning electron microscope equipped with an energy dispersive spectrometer.The results show that the reduction of Dy（Ⅲ） ions in a LiF-DyF3（24 mol%）molten salt system is found to be a quasi-reversible diffusion-controlled process which occurs via a onestep reaction involving the transfer of three electrons.The electro-crystallization processes of the Dy metal at the W electrode and the mode of nucleation confirm that progressive nucleation is dominant at high concentrations of Dy ions in the LiF-DyF3 salt.At lower concentrations,the instantaneous nucleation of Dy with three-dimensional growth of the nuclei is dominant.
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