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Direct Observation of Ethanol Photocatalysis on Rutile TiO2(110) Surface
Dong Wei,Xian-chi Jin,Dong-xu Dai,Zhi-bo Ma*,Xue-ming Yang*
Author NameAffiliationE-mail
Dong Wei State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China  
Xian-chi Jin State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China  
Dong-xu Dai State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China  
Zhi-bo Ma* State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China zhbma@dicp.ac.cn 
Xue-ming Yang* State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China xmyang@dicp.ac.cn 
Abstract:
Photocatalytic dissociation of ethanol molecules on the rutile TiO2(110) surface after UV irradiation has been investigated by scanning tunneling microscope at 80 K. Most of the ethanol molecules adsorb molecularly at Ti sites, similar to the case of methanol. After UV irradiation, two different protrusions of products were observed, one of them has been identified by the technique of tip manipulation, which was likely composed of an acetaldehyde in the middle and two bridge-bonded hydroxyls on both neighbored oxygen sites. Multi-time irradiation experiments have also been performed to further understand the relationship between the two protrusions and the process of ethanol photocatalytic dissociation. These results provide detailed insights into the photocatalysis of ethanol on rutile TiO2(110), which would help us to understand how phtotocatalytic reactions of ethnaol proceed at the fundamental level.
Key words:  Titanium dioxide, Scanning tunneling microscope, Photocatalysis
FundProject:
直接观测乙醇分子在TiO2(110)面的光催化过程
卫东,金闲驰,戴东旭,马志博*,杨学明*
摘要:
利用扫描隧道显微镜研究了在低温(80 K)下乙醇分子在TiO2(110)面的光解离过程.在这种温度下,大部分乙醇分子都以分子吸附的形式吸附在表面五配位钛位.在紫外光照射之后,乙醇发生了光解离,两种不同的产物特征被探测到.使用针尖操控技术对其中一种产物特征进行了详细的分析,成功了解了它的构成,中间一个五配位钛位吸附的乙醛分子加上位于左右两个不同氧列的羟基构成了这种产物.接着实施了多次光照实验来进一步研究乙醇两种光解离产物特征之间的联系.
关键词:  二氧化钛,扫描隧道显微镜,乙醇,光催化
DOI:10.1063/1674-0068/28/cjcp1507155
分类号: