The role of adsorbed ions during electrocatalysis in ionic liquids
The effects of electrode–adsorbate interactions on electrocatalysis at Pt in ionic liquids are described. The ionic liquids are diethylmethylammonium trifluoromethanesulfonate, [dema][TfO], dimethylethylammonium trifluoromethanesulfonate, [dmea][TfO], and diethylmethylammonium bis(trifluoromethanesu...
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| Format: | Article |
| Language: | English |
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American Chemical Society
2014
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| Online Access: | https://eprints.nottingham.ac.uk/55350/ |
| _version_ | 1848799151156887552 |
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| author | Ejigu, Andinet Walsh, Darren A. |
| author_facet | Ejigu, Andinet Walsh, Darren A. |
| author_sort | Ejigu, Andinet |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | The effects of electrode–adsorbate interactions on electrocatalysis at Pt in ionic liquids are described. The ionic liquids are diethylmethylammonium trifluoromethanesulfonate, [dema][TfO], dimethylethylammonium trifluoromethanesulfonate, [dmea][TfO], and diethylmethylammonium bis(trifluoromethanesulfonyl)imide, [dema][Tf2N]. Electrochemical analysis indicates that a monolayer of hydrogen adsorbs onto Pt during potential cycling in [dema][[TfO] and [dmea][TfO]. In addition, a prepeak is observed at lower potentials than that of the main oxidation peak during CO oxidation in the [TfO]−-based liquids. In contrast, hydrogen does not adsorb onto Pt during potential cycling in [dema][Tf2N] and no prepeak is observed during CO oxidation. By displacing adsorbed ions on Pt surfaces with CO at a range of potentials, and measuring the charge passed during ion displacement, the potentials of zero total charge of Pt in [dema][TfO] and [dmea][TfO] were measured as 271 ± 9 and 289 ± 10 mV vs RHE, respectively. CO displacement experiments also indicate that the [Tf2N]− ion is bound to the Pt surface at potentials above −0.2 V and the implications of ion adsorption on electrocatalysis of the CO oxidation reaction and O2 reduction reaction in the protic ionic liquids are discussed. |
| first_indexed | 2025-11-14T20:31:06Z |
| format | Article |
| id | nottingham-55350 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T20:31:06Z |
| publishDate | 2014 |
| publisher | American Chemical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-553502018-10-23T13:27:39Z https://eprints.nottingham.ac.uk/55350/ The role of adsorbed ions during electrocatalysis in ionic liquids Ejigu, Andinet Walsh, Darren A. The effects of electrode–adsorbate interactions on electrocatalysis at Pt in ionic liquids are described. The ionic liquids are diethylmethylammonium trifluoromethanesulfonate, [dema][TfO], dimethylethylammonium trifluoromethanesulfonate, [dmea][TfO], and diethylmethylammonium bis(trifluoromethanesulfonyl)imide, [dema][Tf2N]. Electrochemical analysis indicates that a monolayer of hydrogen adsorbs onto Pt during potential cycling in [dema][[TfO] and [dmea][TfO]. In addition, a prepeak is observed at lower potentials than that of the main oxidation peak during CO oxidation in the [TfO]−-based liquids. In contrast, hydrogen does not adsorb onto Pt during potential cycling in [dema][Tf2N] and no prepeak is observed during CO oxidation. By displacing adsorbed ions on Pt surfaces with CO at a range of potentials, and measuring the charge passed during ion displacement, the potentials of zero total charge of Pt in [dema][TfO] and [dmea][TfO] were measured as 271 ± 9 and 289 ± 10 mV vs RHE, respectively. CO displacement experiments also indicate that the [Tf2N]− ion is bound to the Pt surface at potentials above −0.2 V and the implications of ion adsorption on electrocatalysis of the CO oxidation reaction and O2 reduction reaction in the protic ionic liquids are discussed. American Chemical Society 2014-03-12 Article PeerReviewed application/pdf en https://eprints.nottingham.ac.uk/55350/1/Ionic%20Liquid%20Electrocatalysis.R2.pdf Ejigu, Andinet and Walsh, Darren A. (2014) The role of adsorbed ions during electrocatalysis in ionic liquids. Journal of Physical Chemistry C, 118 . pp. 7414-7422. ISSN 1932-7455 https://pubs.acs.org/doi/pdf/10.1021/jp411730z doi:10.1021/jp411730z doi:10.1021/jp411730z |
| spellingShingle | Ejigu, Andinet Walsh, Darren A. The role of adsorbed ions during electrocatalysis in ionic liquids |
| title | The role of adsorbed ions during electrocatalysis in ionic liquids |
| title_full | The role of adsorbed ions during electrocatalysis in ionic liquids |
| title_fullStr | The role of adsorbed ions during electrocatalysis in ionic liquids |
| title_full_unstemmed | The role of adsorbed ions during electrocatalysis in ionic liquids |
| title_short | The role of adsorbed ions during electrocatalysis in ionic liquids |
| title_sort | role of adsorbed ions during electrocatalysis in ionic liquids |
| url | https://eprints.nottingham.ac.uk/55350/ https://eprints.nottingham.ac.uk/55350/ https://eprints.nottingham.ac.uk/55350/ |