Ionic Liquid Ordering at an Oxide Surface.
Ionic Liquid Ordering at an Oxide Surface.
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DOI:
10.1002/cphc.201600774
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发表时间:
2016-11-04
期刊:
影响因子:
--
通讯作者:
Thomas AG
中科院分区:
文献类型:
--
作者:
Wagstaffe M;Jackman MJ;Syres KL;Generalov A;Thomas AG
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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