期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 18, 期 15, 页码 4620-4626出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201102694
关键词
crystal growth; environmental chemistry; nanostructures; photocatalysts; silver
资金
- National Basic Research Program of China [2011CB935704, 2010CB934700]
- National Natural Science Foundation of China [11079002, 50725208, 20973019]
- Innovation Foundation of BUAA
- China Ministry of Education
Synthesis of inorganic single crystals with exposed high-reactivity facets is a desirable target in the catalytic chemistry field. Polyhedral AgBr microcrystals with an increased percentage of exposed high-reactivity {111} facets have been successfully prepared for the first time, and the photocatalytic performance of these microcrystals when used as an AgBr/Ag plasmonic photocatalyst was investigated. The results indicate that the as-prepared sample has high photocatalytic activity and, under the same measurement conditions, the photodegradation rate of methyl orange dye over these microcrystals is at least four times faster than with other shapes of AgBr/Ag microstructure, as well as 20 times faster than with the highly efficient Ag3PO4 photocatalyst. DFT calculations suggest that the AgBr (111) surface is mainly composed of unsaturated Ag atoms and has a relatively high surface energy, both of which are favorable for enhancing the photocatalytic activity of the AgBr/Ag polyhedron photocatalyst. This work not only provides a highly efficient plasmonic photocatalyst of polyhedral AgBr/Ag microcrystals with an increased percentage of exposed high-reactivity AgBr {111} facets, but also demonstrates that the shape and crystalline quality of the exposed facets have an important influence on the photocatalytic activities.
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