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题名: Layered sphere-shaped TiO2 capped with gold nanoparticles on structural defects and their catalysis of formaldehyde oxidation
作者: Ma, Chunyan; Pang, Guanglong; He, Guangzhi; Li, Yang; He, Chi; Hao, Zhengping
刊名: JOURNAL OF ENVIRONMENTAL SCIENCES
出版日期: 2016-01
卷号: 39, 期号:0, 页码:77-85
关键词: Layered Au/TiO2 nanospheres ; Structural defects ; Oxygen vacancy defects ; Reaction mechanism ; Formaldehyde oxidation
DOI: 10.1016/j.jes.2015.12.004
部门归属: 环境纳米材料实验室
英文摘要: We describe here a one-step method for the synthesis of Au/TiO2 nanosphere materials, which were formed by layered deposition of multiple anatase TiO2 nanosheets. The Au nanoparticles were stabilized by structural defects in each TiO2 nanosheet, including crystal steps and edges, thereby fixing the Au-TiO2 perimeter interface. Reactant transfer occurred along the gaps between these TiO2 nanosheet layers and in contact with catalytically active sites at the Au-TiO2 interface. The doped Au induced the formation of oxygen vacancies in the Au-TiO2 interface. Such vacancies are essential for generating active oxygen species (*O-) on the TiO2 surface and Ti3+ ions in bulk TiO2. These ions can then form Ti3+-O-Ti4+ species, which are known to enhance the catalytic activity of formaldehyde (HCHO) oxidation. These studies on structural and oxygen vacancy defects in Au/TiO2 samples provide a theoretical foundation for the catalytic mechanism of HCHO oxidation on oxide-supported Au materials. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35995
Appears in Collections:环境纳米材料实验室_期刊论文

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