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http://dx.doi.org/10.9713/kcer.2022.60.2.175

Electrochemical Deposition Characteristics of Ca2+ on Cu Wire Electrode in CaCl2 Molten Salt  

Hwang, Dong Wook (Department of Chemical Engineering, Chungbuk National University)
Lee, Jong Hyeon (Department of Materials Science and Engineering, Chungnam National University)
Jeong, Sang Mun (Department of Chemical Engineering, Chungbuk National University)
Publication Information
Korean Chemical Engineering Research / v.60, no.2, 2022 , pp. 175-183 More about this Journal
Abstract
With the expansion of the automobile market, the demand for Nd as an essential rare earth material for automobile motors is rapidly increasing. Research on the calcio-thermic reduction process between Nd2O3 and calcium-based alloys has been extensively studied in order to manufacture Nd. In this study, Ca-Cu, as a reducing for Nd2O3, was prepared by electrolysis in CaCl2 molten salt. Cu wire and graphite were employed as a working electrode and a counter electrode for electrolysis reaction, respectively. The reference electrode was manufactured by putting Ag wire in a mixture of AgCl and CaCl2 at a ratio of 1:99 mol%. The cyclic voltammetry results showed that the deposition of Ca2+ on the surface of working electrode was observed from a potential of -1.8 V, and the reduction potential of Ca2+ decreased as the reaction temperature increased. The diffusion coefficient of Ca2+ calculated by the chronoamperometry experiment was found to be 5.4(±6.8)×10-6 cm2/s. In addition, Ca-Cu liquid alloy was prepared by applying a constant potential to Cu electrodes. The element ratio of Ca-Cu alloy formed by applying a potential of -2.0 V was found to Ca:Cu=1:4.
Keywords
Molten salt; Electrochemical deposition; Ca-Cu alloy; Cyclic voltammetry; Chronoamperometry;
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