Water-Facilitated Electrodeposition of Neodymium in a Phosphonium-Based Ionic Liquid.

Author(s) Sanchez-Cupido, L.; Pringle, J.M.; Siriwardana, A.L.; Unzurrunzaga, A.; Hilder, M.; Forsyth, M.; Pozo-Gonzalo, C.
Journal J Phys Chem Lett
Date Published 2019 Jan 08

Rare-earth metals are considered critical metals due to their extensive use in energy-related applications such as wind turbines and nickel-metal hybrid batteries found in hybrid electrical vehicles. A key drawback of the current processing methods includes the generation of large amounts of toxic and radioactive waste. Thus the efficient recovery of these valuable metals as well as cleaner processing methods are becoming increasingly important. Here we report on a clean electrochemical route for neodymium (Nd) recovery from [P][TFSI], trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)amide which is amplified three times by the presence of water, as evidenced by the cathodic current density and thicker deposits. The role of Nd salt concentrations and water content as an additive in the electrochemistry of Nd in [P][TFSI] has been studied. The presence of metallic neodymium in the deposits has been confirmed by X-ray photoelectron spectroscopy.

DOI 10.1021/acs.jpclett.8b03203
ISSN 1948-7185
Citation J Phys Chem Lett. 2019:289294.

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