基于低共熔溶剂稀土金属钇、钐、铽的电沉积研究

Electrodeposition of Rare-Earth Metals (Yttrium, Samarium and Terbium) from a Deep Eutectic Solvent

摘要:

低共熔溶剂是一种新型离子液体类似物，具有宽的电化学窗口和独特的物理化学性质，在电沉积领域有着潜在的应用。本文提出以氯化胆碱-尿素基低共熔溶剂为介质，系统研究三种稀土金属（钇、钐、铽）在该介质中的电沉积行为，并采用循环伏安法和恒电位法成功实现了稀土金属（钇、钐、铽）的电沉积。研究结果表明，在该低共熔溶剂中钇、钐、铽的电沉积过程为扩散控制过程，扩散系数（D0）分别为7.3744×10-13、1.1032×10-12和9.2936×10-13 cm2/s，沉积所获得的稀土金属钇、钐、铽具有二维纳米网络结构。本研究为稀土金属的电沉积及提炼提供新的策略，具有重大的研究意义和应用价值。

Abstract:

Deep eutectic solvents (DESs) are a new class of ionic liquid (IL) analogues that show a wide electrochemical window and the unique physicochemical properties, and with promising for applications in electrodeposition. Herein, a choline chloride-urea based DES was proposed as a medium for electrodeposition of three rare-earth metals (yttrium, samarium and terbium). All three metals were successfully deposited in the DES by cyclic voltammetry and potentiostatic methods. The results indicate that the electrodepositions of yttrium, samarium and terbium in the DES are diffusion controlled processes, and the diffusion coefficient (D_o) of yttrium, samarium and terbium is 7.3744×10^_-13 1.1032×10^_-12 and 9.2936×10^_-13 cm^₂/s, respectively. The deposits of three rare-earth metals with two-dimension nanonetwork structure were obtained by cyclic voltammetry and potentiostatic methods. This study provides a new approach into electrodeposition and extract and purify of rare-earth metals.