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Low-temperature electrochemical codeposition of aluminum-neodymium alloy in a highly stable solvate ionic liquid

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Abstract

A highly stable solvate ionic liquid comprising a 2:1 (mol/mol) mixture of ethylene carbonate (EC) and AlCl3 was used for near room-temperature electrochemical codeposition of an Al-Nd alloy using chlorides as precursors. This liquid is low-cost, easy to prepare, and has high electrochemical stability. The ionic structure was analyzed by 27Al nuclear magnetic resonance; Raman spectroscopy and the dissolution phenomenon was studied by ultraviolet-visible spectroscopy. The dissolution mechanism of NdCl3 in this solvate ionic liquid was derived as 3[AlCl2(EC)n]+ + 2NdCl3 ⇆ 2Nd(III) + 3[AlCl4]− + 3nEC. Cyclic voltammetry was used to explore the electrochemical behavior of Nd- and Al-containing species, revealing that the reduction of Al and Nd are both one-step electron-gaining processes. X-ray diffraction confirmed that an Al-Nd alloy can be obtained in the form of thermally stable Al2Nd by potentiostatic electrolysis at high cathode overpotential (− 3.5 V vs. Al). Although the deposited alloy layer is not dense, Al-containing solvate ILs have immense potential in green electrometallurgy because of their higher tunability and similar properties to ILs.

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Funding

This work was financially supported by the National Key R&D Program of China (No. 2017YFC0805100), National Natural Science Foundation of China (No. 51574071), and the Fundamental Research Funds for the Central Universities (N172502003).

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, 110819, People’s Republic of China

    Baoguo Zhang, Zhongning Shi, Lingling Shen, Xiaozhen Liu & Zhaowen Wang

  2. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Shenyang, 110819, People’s Republic of China

    Baoguo Zhang, Zhongning Shi, Lingling Shen, Xiaozhen Liu & Zhaowen Wang

  3. College of Science, Northeastern University, Shenyang, 110819, People’s Republic of China

    Junli Xu

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  1. Baoguo Zhang
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  2. Zhongning Shi
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  4. Xiaozhen Liu
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Correspondence to Zhongning Shi.

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Zhang, B., Shi, Z., Shen, L. et al. Low-temperature electrochemical codeposition of aluminum-neodymium alloy in a highly stable solvate ionic liquid. J Solid State Electrochem 23, 1903–1909 (2019). https://doi.org/10.1007/s10008-019-04293-7

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  • DOI: https://doi.org/10.1007/s10008-019-04293-7

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