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:
Chemphyschem : a European journal of chemical physics and physical chemistry
影响因子:
--
通讯作者:
Thomas AG
Thomas AG
中科院分区:
其他
文献类型:
--
作者:
Wagstaffe M;Jackman MJ;Syres KL;Generalov A;Thomas AG

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采用同步辐射光电子能谱和近边X射线吸收精细结构能谱相结合的方法研究了离子液体[C4C1Im][BF4]与新型光阳极材料锐钛矿TiO2的相互作用。该系统可作为基本电解质电极和染料敏化太阳能电池的模型。最初的相互作用包括[BF4]−阴离子的降解,导致F结合到锐钛矿表面的O空位中。在低覆盖率下,[C4C1Im][BF4]通过静电吸引在锐钛矿(101)表面呈有序排列,咪唑环与锐钛矿TiO2表面取向32±4°。随着离子液体覆盖率的增加,氧化物表面对最上层的影响减小,有序性丧失。
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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