Electrochemical studies of hydrogen chloride gas in several room temperature ionic liquids: Mechanism and sensing
The electrochemical behaviour of highly toxic hydrogen chloride (HCl) gas has been investigated in six room temperature ionic liquids (RTILs) containing imidazolium/pyrrolidinium cations and range of anions on a Pt microelectrode using cyclic voltammetry (CV). HCl gas exists in a dissociated form of...
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| Format: | Journal Article |
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R S C Publications
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/50866 |
| _version_ | 1848758555265466368 |
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| author | Murugappan, K. Silvester, Debbie |
| author_facet | Murugappan, K. Silvester, Debbie |
| author_sort | Murugappan, K. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The electrochemical behaviour of highly toxic hydrogen chloride (HCl) gas has been investigated in six room temperature ionic liquids (RTILs) containing imidazolium/pyrrolidinium cations and range of anions on a Pt microelectrode using cyclic voltammetry (CV). HCl gas exists in a dissociated form of H+ and [HCl2]- in RTILs. A peak corresponding to the oxidation of [HCl2]- was observed, resulting in the formation of Cl2 and H+. These species were reversibly reduced to H2 and Cl-, respectively, on the cathodic CV scan. The H+ reduction peak is also present initially when scanned only in the cathodic direction. In the RTILs with a tetrafluoroborate or hexafluorophosphate anion, CVs indicated a reaction of the RTIL with the analyte/electrogenerated products, suggesting that these RTILs might not be suitable solvents for the detection of HCl gas. This was supported by NMR spectroscopy experiments, which showed that the hexafluorophosphate ionic liquid underwent structural changes after HCl gas electrochemical experiments. The analytical utility was then studied in 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C2mim][NTf2]) by utilising both peaks (oxidation of [HCl2]- and reduction of protons) and linear calibration graphs for current vs. concentration for the two processes were obtained. The reactive behaviour of some ionic liquids clearly shows that the choice of the ionic liquid is very important if employing RTILs as solvents for HCl gas detection. |
| first_indexed | 2025-11-14T09:45:51Z |
| format | Journal Article |
| id | curtin-20.500.11937-50866 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:45:51Z |
| publishDate | 2016 |
| publisher | R S C Publications |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-508662017-09-13T15:42:43Z Electrochemical studies of hydrogen chloride gas in several room temperature ionic liquids: Mechanism and sensing Murugappan, K. Silvester, Debbie The electrochemical behaviour of highly toxic hydrogen chloride (HCl) gas has been investigated in six room temperature ionic liquids (RTILs) containing imidazolium/pyrrolidinium cations and range of anions on a Pt microelectrode using cyclic voltammetry (CV). HCl gas exists in a dissociated form of H+ and [HCl2]- in RTILs. A peak corresponding to the oxidation of [HCl2]- was observed, resulting in the formation of Cl2 and H+. These species were reversibly reduced to H2 and Cl-, respectively, on the cathodic CV scan. The H+ reduction peak is also present initially when scanned only in the cathodic direction. In the RTILs with a tetrafluoroborate or hexafluorophosphate anion, CVs indicated a reaction of the RTIL with the analyte/electrogenerated products, suggesting that these RTILs might not be suitable solvents for the detection of HCl gas. This was supported by NMR spectroscopy experiments, which showed that the hexafluorophosphate ionic liquid underwent structural changes after HCl gas electrochemical experiments. The analytical utility was then studied in 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C2mim][NTf2]) by utilising both peaks (oxidation of [HCl2]- and reduction of protons) and linear calibration graphs for current vs. concentration for the two processes were obtained. The reactive behaviour of some ionic liquids clearly shows that the choice of the ionic liquid is very important if employing RTILs as solvents for HCl gas detection. 2016 Journal Article http://hdl.handle.net/20.500.11937/50866 10.1039/c5cp06656e R S C Publications fulltext |
| spellingShingle | Murugappan, K. Silvester, Debbie Electrochemical studies of hydrogen chloride gas in several room temperature ionic liquids: Mechanism and sensing |
| title | Electrochemical studies of hydrogen chloride gas in several room temperature ionic liquids: Mechanism and sensing |
| title_full | Electrochemical studies of hydrogen chloride gas in several room temperature ionic liquids: Mechanism and sensing |
| title_fullStr | Electrochemical studies of hydrogen chloride gas in several room temperature ionic liquids: Mechanism and sensing |
| title_full_unstemmed | Electrochemical studies of hydrogen chloride gas in several room temperature ionic liquids: Mechanism and sensing |
| title_short | Electrochemical studies of hydrogen chloride gas in several room temperature ionic liquids: Mechanism and sensing |
| title_sort | electrochemical studies of hydrogen chloride gas in several room temperature ionic liquids: mechanism and sensing |
| url | http://hdl.handle.net/20.500.11937/50866 |