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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
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
external identifiers
  • scopus:84988024250
  • wos:000388629200015
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
2017-09-18 11:31:56
@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},
  keyword      = {adsorption,ionic liquids,photoelectron spectroscopy,titanium dioxide,X-ray spectroscopy},
  language     = {eng},
  month        = {11},
  number       = {21},
  pages        = {3430--3434},
  publisher    = {John Wiley & Sons},
  series       = {ChemPhysChem},
  title        = {Ionic Liquid Ordering at an Oxide Surface},
  url          = {http://dx.doi.org/10.1002/cphc.201600774},
  volume       = {17},
  year         = {2016},
}