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Ionic Liquid Ordering at an Oxide Surface

Wagstaffe, Michael ; Jackman, Mark J. ; Syres, Karen L. ; Generalov, Alexander LU and Thomas, Andrew G. (2016) In ChemPhysChem 17(21). p.3430-3434
Abstract

The interaction of the ionic liquid [C4C1Im][BF4] with anatase TiO2, a model photoanode material, has been studied using a combination of synchrotron radiation photoelectron spectroscopy and near-edge X-ray absorption fine structure spectroscopy. The system is of interest as a model for fundamental electrolyte–electrode and dye-sensitized solar cells. The initial interaction involves degradation of the [BF4]− anion, resulting in incorporation of F into O vacancies in the anatase surface. At low coverages, [C4C1Im][BF4] is found to order at the anatase(101) surface via electrostatic attraction, with the imidazolium ring oriented 32±4° from... (More)

The interaction of the ionic liquid [C4C1Im][BF4] with anatase TiO2, a model photoanode material, has been studied using a combination of synchrotron radiation photoelectron spectroscopy and near-edge X-ray absorption fine structure spectroscopy. The system is of interest as a model for fundamental electrolyte–electrode and dye-sensitized solar cells. The initial interaction involves degradation of the [BF4]− anion, resulting in incorporation of F into O vacancies in the anatase surface. At low coverages, [C4C1Im][BF4] is found to order at the anatase(101) surface via electrostatic attraction, with the imidazolium ring oriented 32±4° from the anatase TiO2 surface. As the coverage of ionic liquid increases, the influence of the oxide surface on the topmost layers is reduced and the ordering is lost.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
adsorption, ionic liquids, photoelectron spectroscopy, titanium dioxide, X-ray spectroscopy
in
ChemPhysChem
volume
17
issue
21
pages
5 pages
publisher
John Wiley & Sons Inc.
external identifiers
  • pmid:27458919
  • wos:000388629200015
  • scopus:84988024250
ISSN
1439-4235
DOI
10.1002/cphc.201600774
language
English
LU publication?
yes
id
67b96719-7ebb-45cf-876a-91ae02e274b9
date added to LUP
2016-12-01 12:39:40
date last changed
2024-06-15 21:34:54
@article{67b96719-7ebb-45cf-876a-91ae02e274b9,
  abstract     = {{<p>The interaction of the ionic liquid [C<sub>4</sub>C<sub>1</sub>Im][BF<sub>4</sub>] with anatase TiO<sub>2</sub>, a model photoanode material, has been studied using a combination of synchrotron radiation photoelectron spectroscopy and near-edge X-ray absorption fine structure spectroscopy. The system is of interest as a model for fundamental electrolyte–electrode and dye-sensitized solar cells. The initial interaction involves degradation of the [BF<sub>4</sub>]<sup>−</sup> anion, resulting in incorporation of F into O vacancies in the anatase surface. At low coverages, [C<sub>4</sub>C<sub>1</sub>Im][BF<sub>4</sub>] is found to order at the anatase(101) surface via electrostatic attraction, with the imidazolium ring oriented 32±4° from the anatase TiO<sub>2</sub> surface. As the coverage of ionic liquid increases, the influence of the oxide surface on the topmost layers is reduced and the ordering is lost.</p>}},
  author       = {{Wagstaffe, Michael and Jackman, Mark J. and Syres, Karen L. and Generalov, Alexander and Thomas, Andrew G.}},
  issn         = {{1439-4235}},
  keywords     = {{adsorption; ionic liquids; photoelectron spectroscopy; titanium dioxide; X-ray spectroscopy}},
  language     = {{eng}},
  month        = {{11}},
  number       = {{21}},
  pages        = {{3430--3434}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{ChemPhysChem}},
  title        = {{Ionic Liquid Ordering at an Oxide Surface}},
  url          = {{http://dx.doi.org/10.1002/cphc.201600774}},
  doi          = {{10.1002/cphc.201600774}},
  volume       = {{17}},
  year         = {{2016}},
}