The interaction of the ionic liquid [C C Im][BF ] with anatase TiO , 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 ] anion, resulting in incorporation of F into O vacancies in the anatase surface. At low coverages, [C C Im][BF ] is found to order at the anatase(101) surface via electrostatic attraction, with the imidazolium ring oriented 32±4° from the anatase TiO 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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| http://dx.doi.org/10.1002/cphc.201600774 | DOI Listing |
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