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Facile Room-Temperature Electrodeposition of Rare Earth Metals in a Fluorine-Free Task-Specific Electrolyte
Abstract
Electrochemical deposition of rare earth metals at room temperature has attracted increasing interest due to its advantage in energy efficiency over traditional hydrometallurgical and pyrometallurgical processes. Recent progress has been made with fluorinated electrolyte systems; however, the formation of an electrode-passivating fluoride layer by electrolyte decomposition is often overlooked. Such a passivation layer causes significant and rapid decay of the deposition current and significantly hinders practical application. To address this issue, we demonstrate a fluorine (F)-free task-specific electrolyte utilizing the borohydride anion for the efficient electrodeposition of rare earth metals. By eliminating the passivation effect, the deposition process exhibits a stable current and accumulates a thick neodymium deposit on the electrode. Raman spectroscopy of the electrolyte reveals a synergetic effect between rare earth borohydride and lithium borohydride which promotes the dissociation of both borohydride salts, resulting in significantly increased ionic conductivity and electrochemical performance. Cyclic voltammetry and in-depth X-ray photoelectron spectroscopy of the deposits suggest that the electrodeposition of rare earth metals could undergo a Li-mediated reduction process. Finally, quantitative analysis of the deposits reveals that the overall concentration of the rare earth elements reaches 75% which contains 40–48% metallic phase.
- Authors:
-
- University of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- University of Tennessee, Knoxville, TN (United States)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Idaho National Laboratory (INL), Idaho Falls, ID (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Idaho National Laboratory (INL), Idaho Falls, ID (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Materials & Manufacturing Technologies Office (AMMTO)
- OSTI Identifier:
- 1999029
- Alternate Identifier(s):
- OSTI ID: 2204968
- Report Number(s):
- INL/JOU-23-74834-Rev000
Journal ID: ISSN 2168-0485
- Grant/Contract Number:
- AC07-05ID14517; AC05-00OR22725; AL-12-350-001
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Sustainable Chemistry & Engineering
- Additional Journal Information:
- Journal Volume: 11; Journal Issue: 34; Journal ID: ISSN 2168-0485
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; rare earth elements; electrodeposition; passivation effect; neodymium; dysprosium; passivation effect,
Citation Formats
Yuan, Yating, Gaugler, James, Fan, Juntian, Thapaliya, Bishnu Prasad, Luo, Huimin, Atifi, Abderrahman, Diaz, Luis A., and Dai, Sheng. Facile Room-Temperature Electrodeposition of Rare Earth Metals in a Fluorine-Free Task-Specific Electrolyte. United States: N. p., 2023.
Web. doi:10.1021/acssuschemeng.3c01519.
Yuan, Yating, Gaugler, James, Fan, Juntian, Thapaliya, Bishnu Prasad, Luo, Huimin, Atifi, Abderrahman, Diaz, Luis A., & Dai, Sheng. Facile Room-Temperature Electrodeposition of Rare Earth Metals in a Fluorine-Free Task-Specific Electrolyte. United States. https://doi.org/10.1021/acssuschemeng.3c01519
Yuan, Yating, Gaugler, James, Fan, Juntian, Thapaliya, Bishnu Prasad, Luo, Huimin, Atifi, Abderrahman, Diaz, Luis A., and Dai, Sheng. Thu .
"Facile Room-Temperature Electrodeposition of Rare Earth Metals in a Fluorine-Free Task-Specific Electrolyte". United States. https://doi.org/10.1021/acssuschemeng.3c01519.
@article{osti_1999029,
title = {Facile Room-Temperature Electrodeposition of Rare Earth Metals in a Fluorine-Free Task-Specific Electrolyte},
author = {Yuan, Yating and Gaugler, James and Fan, Juntian and Thapaliya, Bishnu Prasad and Luo, Huimin and Atifi, Abderrahman and Diaz, Luis A. and Dai, Sheng},
abstractNote = {Electrochemical deposition of rare earth metals at room temperature has attracted increasing interest due to its advantage in energy efficiency over traditional hydrometallurgical and pyrometallurgical processes. Recent progress has been made with fluorinated electrolyte systems; however, the formation of an electrode-passivating fluoride layer by electrolyte decomposition is often overlooked. Such a passivation layer causes significant and rapid decay of the deposition current and significantly hinders practical application. To address this issue, we demonstrate a fluorine (F)-free task-specific electrolyte utilizing the borohydride anion for the efficient electrodeposition of rare earth metals. By eliminating the passivation effect, the deposition process exhibits a stable current and accumulates a thick neodymium deposit on the electrode. Raman spectroscopy of the electrolyte reveals a synergetic effect between rare earth borohydride and lithium borohydride which promotes the dissociation of both borohydride salts, resulting in significantly increased ionic conductivity and electrochemical performance. Cyclic voltammetry and in-depth X-ray photoelectron spectroscopy of the deposits suggest that the electrodeposition of rare earth metals could undergo a Li-mediated reduction process. Finally, quantitative analysis of the deposits reveals that the overall concentration of the rare earth elements reaches 75% which contains 40–48% metallic phase.},
doi = {10.1021/acssuschemeng.3c01519},
journal = {ACS Sustainable Chemistry & Engineering},
number = 34,
volume = 11,
place = {United States},
year = {Thu Aug 17 00:00:00 EDT 2023},
month = {Thu Aug 17 00:00:00 EDT 2023}
}
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