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 (Do) of yttrium, samarium and terbium is 7.3744×10-13 1.1032×10-12 and 9.2936×10-13 cm2/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.