A Study of the Na/Na+ Redox Couple in Some Room Temperature Ionic Liquids
Cyclic voltammetry experiments were conducted using solutions of Na + ions in 12 different ionic liquids (RTILs) on a nickel microelectrode in order to observe the deposition and stripping of metallic sodium. In most of the liquids the potential window was insufficient to observe the formation and r...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
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2010
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| _version_ | 1797086631055851520 |
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| author | Wibowo, R Aldous, L Rogers, E Jones, S Compton, R |
| author_facet | Wibowo, R Aldous, L Rogers, E Jones, S Compton, R |
| author_sort | Wibowo, R |
| collection | OXFORD |
| description | Cyclic voltammetry experiments were conducted using solutions of Na + ions in 12 different ionic liquids (RTILs) on a nickel microelectrode in order to observe the deposition and stripping of metallic sodium. In most of the liquids the potential window was insufficient to observe the formation and removal of bulk sodium, despite the enlargement of some potential windows in the presence of sodium. However, in the ionic liquids N-butyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([C 4mpyrr][NTf2]), N-ethyldimethylpropylammonium bis(trifluoromethylsulfonyl)imide ([N2,1,1,3][NTf2]) and N-hexyltriethylammonium bis(trifluoromethylsulfonyl) imide ([N 6,2,2,2][NTf2]) the deposition and stripping peaks for the bulk sodium were observed, allowing simulation of the current-voltage curves and extraction of kinetic and thermodynamic data, notably the electrochemical rate constant, k0, and the formal potential, Ef0, for the Na/Na+ couple. Variable temperature measurements also gave quantitative information on the temperature dependence of Ef0, dEf0/dT. Diffusion coefficients for Na+ ions in the three RTILs are also reported. All parameters are compared and contrasted with that of the Li/Li+ couple, demonstrating that sodium possesses a more positive Ef0 than lithium in the investigated RTILs, although the difference is markedly less than that in solvents such as water or ammonia. © 2010 American Chemical Society. |
| first_indexed | 2024-03-07T02:24:39Z |
| format | Journal article |
| id | oxford-uuid:a52e3939-54b1-44f5-bbdc-345e8a94205c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:24:39Z |
| publishDate | 2010 |
| record_format | dspace |
| spelling | oxford-uuid:a52e3939-54b1-44f5-bbdc-345e8a94205c2022-03-27T02:38:37ZA Study of the Na/Na+ Redox Couple in Some Room Temperature Ionic LiquidsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:a52e3939-54b1-44f5-bbdc-345e8a94205cEnglishSymplectic Elements at Oxford2010Wibowo, RAldous, LRogers, EJones, SCompton, RCyclic voltammetry experiments were conducted using solutions of Na + ions in 12 different ionic liquids (RTILs) on a nickel microelectrode in order to observe the deposition and stripping of metallic sodium. In most of the liquids the potential window was insufficient to observe the formation and removal of bulk sodium, despite the enlargement of some potential windows in the presence of sodium. However, in the ionic liquids N-butyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([C 4mpyrr][NTf2]), N-ethyldimethylpropylammonium bis(trifluoromethylsulfonyl)imide ([N2,1,1,3][NTf2]) and N-hexyltriethylammonium bis(trifluoromethylsulfonyl) imide ([N 6,2,2,2][NTf2]) the deposition and stripping peaks for the bulk sodium were observed, allowing simulation of the current-voltage curves and extraction of kinetic and thermodynamic data, notably the electrochemical rate constant, k0, and the formal potential, Ef0, for the Na/Na+ couple. Variable temperature measurements also gave quantitative information on the temperature dependence of Ef0, dEf0/dT. Diffusion coefficients for Na+ ions in the three RTILs are also reported. All parameters are compared and contrasted with that of the Li/Li+ couple, demonstrating that sodium possesses a more positive Ef0 than lithium in the investigated RTILs, although the difference is markedly less than that in solvents such as water or ammonia. © 2010 American Chemical Society. |
| spellingShingle | Wibowo, R Aldous, L Rogers, E Jones, S Compton, R A Study of the Na/Na+ Redox Couple in Some Room Temperature Ionic Liquids |
| title | A Study of the Na/Na+ Redox Couple in Some Room Temperature Ionic Liquids |
| title_full | A Study of the Na/Na+ Redox Couple in Some Room Temperature Ionic Liquids |
| title_fullStr | A Study of the Na/Na+ Redox Couple in Some Room Temperature Ionic Liquids |
| title_full_unstemmed | A Study of the Na/Na+ Redox Couple in Some Room Temperature Ionic Liquids |
| title_short | A Study of the Na/Na+ Redox Couple in Some Room Temperature Ionic Liquids |
| title_sort | study of the na na redox couple in some room temperature ionic liquids |
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