Electrochemical Behavior of Sm(III) and Electrodeposition of Samarium from 1-Butyl-1-Methylpyrrolidinium Dicyanamide Ionic Liquid
| Autor: | Chrysanthus Andrew, Chandran Murugesan, Mani Jayakumar |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Journal of The Electrochemical Society. 169:022503 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/1945-7111/ac4f76 |
| Popis: | Electrodeposition of rare-earth metals using ionic liquid is considered as a potential alternative to conventional high-temperature molten salt electrolysis. Herein, the electrochemical reduction of samarium(III) at near ambient conditions is investigated using different samarium precursors, namely, triflate (Sm(OTf)3), nitrate (Sm(NO3)3.6H2O) and chloride (SmCl3), in 1-butyl-1-methylpyrrolidinium dicyanamide ([BMP][DCA]) ionic liquid. FT-infrared and Raman spectroscopy analyses of Sm3+/[BMP][DCA] solutions confirm the coordination of Sm3+ species with D CA − ion through nitrogen atom. Cyclic voltammetry of Sm3+ at glassy carbon electrode provides evidence of a two-step reduction process in all the systems via Sm3+ to Sm2+ and Sm2+ to Sm0 with peaks observed at similar reduction potentials owing to indifference in samarium(III) chemistries in each medium which is supported by a plausible mechanism. The diffusion coefficient of Sm3+ in [BMP][DCA] was determined to be 3.00 × 10−7, 3.64 × 10−8 and 1.90 × 10−7 cm2.s−1 for Sm(OTf)3, Sm(NO3)3.6H2O and SmCl3 systems, respectively. The electrodeposition of samarium was achieved on nickel and glassy carbon substrates under two different potentials and temperatures. X-ray photoelectron spectroscopy confirms that the samarium electrodeposits are a mixture of metallic and oxide forms. |
| Databáze: | OpenAIRE |
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