Mechanistic Studies of the Electro-oxidation Pathway of Ammonia in Several Room-Temperature Ionic Liquids
A mechanistic study of the direct oxidation of ammonia has been reported in several room-temperature ionic liquids (RTILs), namely, [C4mim][BF4], [C4mim][OTf], [C2mim][NTf2], [C4mim][NTf2], and [C4mim][PF6], on a 10 ím diameter Pt microdisk electrode. In four of the RTILs studied, the cyclic voltamm...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Published: |
American Chemical Society
2007
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| Online Access: | http://hdl.handle.net/20.500.11937/32761 |
| _version_ | 1848753753107202048 |
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| author | Ji, X. Silvester, Debbie Aldous, L. Hardacre, C. Compton, R. |
| author_facet | Ji, X. Silvester, Debbie Aldous, L. Hardacre, C. Compton, R. |
| author_sort | Ji, X. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | A mechanistic study of the direct oxidation of ammonia has been reported in several room-temperature ionic liquids (RTILs), namely, [C4mim][BF4], [C4mim][OTf], [C2mim][NTf2], [C4mim][NTf2], and [C4mim][PF6], on a 10 ím diameter Pt microdisk electrode. In four of the RTILs studied, the cyclic voltammetric analysis suggests that ammonia is initially oxidized to nitrogen, N2, and protons, which are transferred to an ammonia molecule, forming NH4+ via the protonation of the anion(s) (A-). In contrast, NH4+ is formed first in [C4-mim][PF6], followed by the protonated anion(s), HA. In all five RTILs, both HA and NH4+ are reduced at the electrode surface, forming hydrogen gas, which is then oxidized. The effect of changing the RTIL anion is discussed, and this may have implications in the defining of pKa in RTIL media. This work also has implications in the possible amperometric sensing of ammonia gas. |
| first_indexed | 2025-11-14T08:29:31Z |
| format | Journal Article |
| id | curtin-20.500.11937-32761 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:29:31Z |
| publishDate | 2007 |
| publisher | American Chemical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-327612017-09-13T15:27:37Z Mechanistic Studies of the Electro-oxidation Pathway of Ammonia in Several Room-Temperature Ionic Liquids Ji, X. Silvester, Debbie Aldous, L. Hardacre, C. Compton, R. A mechanistic study of the direct oxidation of ammonia has been reported in several room-temperature ionic liquids (RTILs), namely, [C4mim][BF4], [C4mim][OTf], [C2mim][NTf2], [C4mim][NTf2], and [C4mim][PF6], on a 10 ím diameter Pt microdisk electrode. In four of the RTILs studied, the cyclic voltammetric analysis suggests that ammonia is initially oxidized to nitrogen, N2, and protons, which are transferred to an ammonia molecule, forming NH4+ via the protonation of the anion(s) (A-). In contrast, NH4+ is formed first in [C4-mim][PF6], followed by the protonated anion(s), HA. In all five RTILs, both HA and NH4+ are reduced at the electrode surface, forming hydrogen gas, which is then oxidized. The effect of changing the RTIL anion is discussed, and this may have implications in the defining of pKa in RTIL media. This work also has implications in the possible amperometric sensing of ammonia gas. 2007 Journal Article http://hdl.handle.net/20.500.11937/32761 10.1021/jp0715732 American Chemical Society restricted |
| spellingShingle | Ji, X. Silvester, Debbie Aldous, L. Hardacre, C. Compton, R. Mechanistic Studies of the Electro-oxidation Pathway of Ammonia in Several Room-Temperature Ionic Liquids |
| title | Mechanistic Studies of the Electro-oxidation Pathway of Ammonia in Several Room-Temperature Ionic Liquids |
| title_full | Mechanistic Studies of the Electro-oxidation Pathway of Ammonia in Several Room-Temperature Ionic Liquids |
| title_fullStr | Mechanistic Studies of the Electro-oxidation Pathway of Ammonia in Several Room-Temperature Ionic Liquids |
| title_full_unstemmed | Mechanistic Studies of the Electro-oxidation Pathway of Ammonia in Several Room-Temperature Ionic Liquids |
| title_short | Mechanistic Studies of the Electro-oxidation Pathway of Ammonia in Several Room-Temperature Ionic Liquids |
| title_sort | mechanistic studies of the electro-oxidation pathway of ammonia in several room-temperature ionic liquids |
| url | http://hdl.handle.net/20.500.11937/32761 |