期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 17, 期 52, 页码 15032-15038出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201101466
关键词
nanostructures; photocatalysts; reactive facets; surface chemistry; titanium dioxide
资金
- National Basic Research Program of China [2007CB613302]
- National Natural Science Foundation of China [20973102, 51021062, 51002091]
- ministry of education
Well-faceted nanocrystals of anatase TiO2 with specific reactive facets have attracted extraordinary research interest due to their many intrinsic shape-dependent properties. In this work, hierarchical TiO2 microspheres consisting of anatase nanosheets or decahedrons were synthesized by means of a facile hydrothermal technique; meanwhile, the percentage of {001} facets can be tuned from 82 to 45?%. Importantly, by investigating the photo-oxidation reactions for .OH radical generation and photoreduction reactions for hydrogen evolution, the TiO2 microspheres consisting of nano-decahedrons with 45?% {001} facets show superior photoreactivity (more than 4.8-times) compared to the nanosheets with 82?% {001} facets. By analyzing the results of scanning electron microscopy (SEM), photoluminescence (PL) and first-principles density functional theory (DFT) calculations, a model of charge separation between the well-formed {001} and {101} facets is proposed, and the enhanced photocatalytic efficiency is largely attributed to the efficient separation of photogenerated charges among the crystal facets co-exposed.
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