Experimental Evidence of Long-Lived Electric Fields of Ionic Liquid Bilayers
Herein we demonstrate that ionic liquids can form long-lived double layers, generating electric fields detectable by straightforward open circuit potential (OCP) measurements. In imidazolium-based ionic liquids an external negative voltage pulse leads to an exceedingly stable near-surface dipolar la...
| Main Authors: | , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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AMER CHEMICAL SOC
2021
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| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/DP190100735 http://hdl.handle.net/20.500.11937/90479 |
| _version_ | 1848765385322528768 |
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| author | Belotti, Mattia Lyu, Xin Xu, L. Halat, P. Darwish, Nadim Silvester-Dean, Debbie Goh, Ching Izgorodina, E.I. Coote, M.L. Ciampi, Simone |
| author_facet | Belotti, Mattia Lyu, Xin Xu, L. Halat, P. Darwish, Nadim Silvester-Dean, Debbie Goh, Ching Izgorodina, E.I. Coote, M.L. Ciampi, Simone |
| author_sort | Belotti, Mattia |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Herein we demonstrate that ionic liquids can form long-lived double layers, generating electric fields detectable by straightforward open circuit potential (OCP) measurements. In imidazolium-based ionic liquids an external negative voltage pulse leads to an exceedingly stable near-surface dipolar layer, whose field manifests as long-lived (∼1-100 h) discrete plateaus in OCP versus time traces. These plateaus occur within an ionic liquid-specific and sharp potential window, defining a simple experimental method to probe the onset of interfacial ordering phenomena, such as overscreening and crowding. Molecular dynamics modeling reveals that the OCP arises from the alignment of the individual ion dipoles to the external electric field pulse, with the magnitude of the resulting OCP correlating with the product of the projected dipole moment of the cation and the ratio between the cation diffusion coefficient and its volume. Our findings also reveal that a stable overscreened structure is more likely to form if the interface is first forced through crowding, possibly accounting for the scattered literature data on relaxation kinetics of near-surface structures in ionic liquids. |
| first_indexed | 2025-11-14T11:34:24Z |
| format | Journal Article |
| id | curtin-20.500.11937-90479 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:34:24Z |
| publishDate | 2021 |
| publisher | AMER CHEMICAL SOC |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-904792023-03-20T02:07:17Z Experimental Evidence of Long-Lived Electric Fields of Ionic Liquid Bilayers Belotti, Mattia Lyu, Xin Xu, L. Halat, P. Darwish, Nadim Silvester-Dean, Debbie Goh, Ching Izgorodina, E.I. Coote, M.L. Ciampi, Simone Science & Technology Physical Sciences Chemistry, Multidisciplinary Chemistry FREQUENCY GENERATION SPECTROSCOPY DOUBLE-LAYER DIFFERENTIAL CAPACITANCE ELECTROSTATIC CATALYSIS FREE ANALYZER INTERFACE ELECTROLYTE COEFFICIENTS RELAXATION MONOLAYERS Herein we demonstrate that ionic liquids can form long-lived double layers, generating electric fields detectable by straightforward open circuit potential (OCP) measurements. In imidazolium-based ionic liquids an external negative voltage pulse leads to an exceedingly stable near-surface dipolar layer, whose field manifests as long-lived (∼1-100 h) discrete plateaus in OCP versus time traces. These plateaus occur within an ionic liquid-specific and sharp potential window, defining a simple experimental method to probe the onset of interfacial ordering phenomena, such as overscreening and crowding. Molecular dynamics modeling reveals that the OCP arises from the alignment of the individual ion dipoles to the external electric field pulse, with the magnitude of the resulting OCP correlating with the product of the projected dipole moment of the cation and the ratio between the cation diffusion coefficient and its volume. Our findings also reveal that a stable overscreened structure is more likely to form if the interface is first forced through crowding, possibly accounting for the scattered literature data on relaxation kinetics of near-surface structures in ionic liquids. 2021 Journal Article http://hdl.handle.net/20.500.11937/90479 10.1021/jacs.1c06385 English http://purl.org/au-research/grants/arc/DP190100735 http://purl.org/au-research/grants/arc/FT190100148 http://purl.org/au-research/grants/arc/FL170100041 AMER CHEMICAL SOC fulltext |
| spellingShingle | Science & Technology Physical Sciences Chemistry, Multidisciplinary Chemistry FREQUENCY GENERATION SPECTROSCOPY DOUBLE-LAYER DIFFERENTIAL CAPACITANCE ELECTROSTATIC CATALYSIS FREE ANALYZER INTERFACE ELECTROLYTE COEFFICIENTS RELAXATION MONOLAYERS Belotti, Mattia Lyu, Xin Xu, L. Halat, P. Darwish, Nadim Silvester-Dean, Debbie Goh, Ching Izgorodina, E.I. Coote, M.L. Ciampi, Simone Experimental Evidence of Long-Lived Electric Fields of Ionic Liquid Bilayers |
| title | Experimental Evidence of Long-Lived Electric Fields of Ionic Liquid Bilayers |
| title_full | Experimental Evidence of Long-Lived Electric Fields of Ionic Liquid Bilayers |
| title_fullStr | Experimental Evidence of Long-Lived Electric Fields of Ionic Liquid Bilayers |
| title_full_unstemmed | Experimental Evidence of Long-Lived Electric Fields of Ionic Liquid Bilayers |
| title_short | Experimental Evidence of Long-Lived Electric Fields of Ionic Liquid Bilayers |
| title_sort | experimental evidence of long-lived electric fields of ionic liquid bilayers |
| topic | Science & Technology Physical Sciences Chemistry, Multidisciplinary Chemistry FREQUENCY GENERATION SPECTROSCOPY DOUBLE-LAYER DIFFERENTIAL CAPACITANCE ELECTROSTATIC CATALYSIS FREE ANALYZER INTERFACE ELECTROLYTE COEFFICIENTS RELAXATION MONOLAYERS |
| url | http://purl.org/au-research/grants/arc/DP190100735 http://purl.org/au-research/grants/arc/DP190100735 http://purl.org/au-research/grants/arc/DP190100735 http://hdl.handle.net/20.500.11937/90479 |