Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
The 69th special feature “Frontiers of Molten Salts and Ionic Liquids”
Influence of Fluoride Ions on Electrochemical Behavior of Lanthanum and Neodymium Ions in Molten LiCl
Qilin YUANXin LUOsamu TAKEDAHongmin ZHU
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2024 年 92 巻 6 号 p. 063001

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The influence of fluoride ions on electrochemical behavior of lanthanum and neodymium ions in molten LiCl at 1073 K was experimentally investigated. Cyclic voltammetry and square wave voltammetry were conducted using a molybdenum working electrode. Galvanostatic electrolysis using a molybdenum electrode as cathode in molten LiCl-5 mol%LaCl3, LiCl-5 mol%NdCl3, and LiCl-30 mol%LiF-5 mol%NdCl3 were conducted to investigate the influence of fluoride ions. The result indicates that the cathodic process for La3+ in molten LiCl is a one-step reaction, i.e., La3+ + 3e = La. The cathodic process of Nd3+ in molten LiCl is a two-step reaction, including Nd3+ + e = Nd2+ and Nd2+ + 2e = Nd. With the introduction of fluoride ions, however, the current of the first cathodic reaction decreases and when the molar ratio of F to Nd3+ reaches to 6, the cathodic process of Nd3+ turns to a one-step process: Nd3+ + 3e = Nd. The results indicate that the addition of fluoride ions makes Nd3+ stabler and thus inhibits the reaction to Nd2+ in molten chloride. The deposited neodymium metal was dispersed in the electrolyte in pure chloride melt due to the shuttle of disproportionation and proportionation reactions of neodymium ions. With the addition of enough LiF to melt, the deposited neodymium metal adhered on the cathode. The current efficiency of neodymium electrolysis was remarkably improved and reached the similar value as that for lanthanum electrolysis.

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© The Author(s) 2024. Published by ECSJ.

This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License (CC BY-NC-SA, http://creativecommons.org/licenses/by-nc-sa/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium by share-alike, provided the original work is properly cited. For permission for commercial reuse, please email to the corresponding author. [DOI: 10.5796/electrochemistry.24-69005].
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