Facet Dependence of Photochemistry of Methanol on Single Crystalline Rutile Titania  

甲醇在二氧化钛上的光化学性质与表面结构的相关性

作　　者：郝群庆 王志强[1] 毛新春[2] 周传耀[1] 戴东旭[1] 杨学明[1] 

机构地区：[1]中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连116023 [2]中国工程物理研究院材料研究所可持续界面动力学研究中心,成都610200

出　　处：《Chinese Journal of Chemical Physics》2016年第1期105-111,I0002,共8页化学物理学报（英文）

基　　金：This work was supported the Natural Science Foundation of Liaoning Province （No.2015020242）, the National Natural Science Foundation of China （No.21203189 and No.21573225）, and the State Key Laboratory of Molecular Reaction Dynamics （No.ZZ- 2014-02）.

摘　　要：The crystal phase, morphology and facet significantly influence the catalytic and photocat- alytic activity of TiO2. In view of optimizing the performance of catalysts, extensive efforts have been devoted to designing new sophisticate TiO2 structures with desired facet exposure, necessitating the understanding of chemical properties of individual surface. In this work, we have examined the photooxidation of methanol on TiO 2 （011）- （ 2 × 1 ） and TiO 2 （110） - （1 ×1） by two-photon photoemission spectroscopy （2PPE）. An excited state at 2.5 eV above the Fermi level （EF） on methanol covered （011） and （110） interface has been detected. The excited state is an indicator of reduction of TiO2 interface. Irradiation dependence of the excited resonance signal during the photochemistry of methanol on TiO2（011）-（2×1） and TiO2（110）-（1× 1） is ascribed to the interface reduction by producing surface hydroxyls. The reaction rate of photooxidation of methanol on TiO2（110）-（1× 1） is about 11.4 times faster than that on TiO2（011）-（2×1）, which is tentatively explained by the difference in the surface atomic configuration. This work not only provides a detailed characterization of the electronic structure of methanol/TiO2 interface by 2PPE, but also shows the importance of the surface structure in the photoreactivity on TiO2.

关 键 词：TiO2 Excited state Two-photon photoemission spectroscopy Reaction rate of photooxidation 

分 类 号：O[理学]