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Correlating Electrochemical Behavior and Speciation in Neodymium Ionic Liquid Electrolyte Mixtures in the Presence of Water
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-09-08 , DOI: 10.1021/acssuschemeng.0c04288 Laura Sanchez-Cupido 1 , Jennifer M. Pringle 2 , Amal I. Siriwardana 1 , Matthias Hilder 2 , Maria Forsyth 2 , Cristina Pozo-Gonzalo 2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-09-08 , DOI: 10.1021/acssuschemeng.0c04288 Laura Sanchez-Cupido 1 , Jennifer M. Pringle 2 , Amal I. Siriwardana 1 , Matthias Hilder 2 , Maria Forsyth 2 , Cristina Pozo-Gonzalo 2
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Electrodeposition of rare earth metals at moderate temperature as a means to recover these critical materials from spent magnets or electric motors would be a major breakthrough to close the loop using a sustainable approach. This work highlights that neodymium electrodeposition in a phosphonium-based ionic liquid requires the presence of water in order to achieve a continuous layer of metal deposition. Herein, we describe that the nature of the Nd3+ solvation sphere being composed of both bis(trifluoromethylsulfonyl)imide (TFSI) and water determines neodymium deposition and that this process is not entirely dependent on the physicochemical properties of the electrolyte. The importance of the concentration of neodymium salt for the electrodeposition process has also been investigated, showing that 0.1 mol/kg Nd(TFSI)3/[P66614][TFSI] with 0.4 wt % water is the most promising electrolyte investigated, giving a favorable Nd3+ reduction process and better quality deposits.
中文翻译：
水存在下钕离子液体电解质混合物的电化学行为和形态的相关性
在中等温度下进行电沉积作为从废磁铁或电动机中回收这些关键材料的一种手段，将是使用可持续方法来闭合环路的一项重大突破。这项工作强调了electrode基离子液体中的钕电沉积需要水的存在才能实现连续的金属沉积层。在此，我们描述Nd 3+的性质由双（三氟甲基磺酰基）酰亚胺（TFSI）和水组成的溶剂化球决定了钕的沉积，并且该过程并不完全取决于电解质的物理化学性质。还研究了钕盐浓度对电沉积过程的重要性，表明含0.4 wt％水的0.1 mol / kg Nd（TFSI）3 / [P 66614 ] [TFSI]是最有前途的电解质，得到了Nd 3+还原工艺良好，沉积物质量更好。
更新日期：2020-09-21
中文翻译：
水存在下钕离子液体电解质混合物的电化学行为和形态的相关性
在中等温度下进行电沉积作为从废磁铁或电动机中回收这些关键材料的一种手段，将是使用可持续方法来闭合环路的一项重大突破。这项工作强调了electrode基离子液体中的钕电沉积需要水的存在才能实现连续的金属沉积层。在此，我们描述Nd 3+的性质由双（三氟甲基磺酰基）酰亚胺（TFSI）和水组成的溶剂化球决定了钕的沉积，并且该过程并不完全取决于电解质的物理化学性质。还研究了钕盐浓度对电沉积过程的重要性，表明含0.4 wt％水的0.1 mol / kg Nd（TFSI）3 / [P 66614 ] [TFSI]是最有前途的电解质，得到了Nd 3+还原工艺良好，沉积物质量更好。
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