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Electrochemical properties and extraction of Dy on liquid Sn electrode in LiCl–KCl molten salt

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Abstract

To extract dysprosium (Dy) from LiCl–KCl molten salt, the electrochemical properties of Dy on liquid Sn electrode were explored by various electrochemical methods such as cyclic voltammetry (CV), chronopotentiometry (CP), and coulometric titration (CT). The Dy-Sn solid solution ((Dy-Sn)solution) was formed when the Dy was deposited on liquid Sn. The electrode process is a reversible reaction controlled by diffusion, and the diffusion coefficient of Dy(III) in LiCl–KCl molten salt was measured in the order of 10−5 cm2 s−1. CT and CP were used to assess the solubility and diffusion coefficient of Dy in liquid Sn, respectively. Meanwhile, the co-deposition of Dy(III) and Sn(II) was analyzed by CV and square wave voltammetry (SWV) to obtain the Dy-Sn intermetallic compounds, and four electrochemical signals related to Dy-Sn intermetallic compounds were observed. In addition, the feasibility of extracting Dy using liquid Sn electrode was verified by galvanostatic electrolysis (GE) and potentiostatic electrolysis (PE), and the products were characterized by XRD and SEM–EDS. The Dy-Sn alloys prepared by PE and GE consisted of DySn2 and (DySn3 + DySn2), respectively.

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Funding

This work is supported by the National Natural Science Foundation of China (grant number: 21876034), the Start-up Fund of University of South China (grant number: 200XQD051), and the Scientific Research Project of Hunan Provincial Education Department (grant number: 210SJY073).

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Authors and Affiliations

  1. School of Nuclear Science and Technology, University of South China, 28 Changsheng West Road, Hengyang, 421001, People’s Republic of China

    Wenlong Li, Xin Zhang, Ji Wang, Lifeng Chen, Quanzhang Sun & Yuezhou Wei

  2. Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, People’s Republic of China

    Wei Han & Mei Li

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  1. Wenlong Li
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  2. Xin Zhang
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  3. Ji Wang
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  6. Wei Han
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  7. Mei Li
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Correspondence to Wei Han or Mei Li.

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Li, W., Zhang, X., Wang, J. et al. Electrochemical properties and extraction of Dy on liquid Sn electrode in LiCl–KCl molten salt. J Solid State Electrochem 27, 927–937 (2023). https://doi.org/10.1007/s10008-022-05373-x

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