Ionic liquid ordering at an oxide surface: 1-butyl-3-methylimidazolium tetrafluoroborate, [C4C1Im][BF4], interaction with the anatase TiO2(101) surface

Wagstaffe, M, Jackman, MJ, Syres, K orcid iconORCID: 0000-0001-7439-475X, Generalov, A and Thomas, AG (2016) Ionic liquid ordering at an oxide surface: 1-butyl-3-methylimidazolium tetrafluoroborate, [C4C1Im][BF4], interaction with the anatase TiO2(101) surface. ChemPhysChem . ISSN 1439-4235

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Official URL: http://dx.doi.org/10.1002/cphc.201600774

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 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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