Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 18, Issue 20, Pages 6360-6369Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201102606
Keywords
microwave chemistry; photocatalysis; silver; silver bromide; surface plasmon resonance
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Funding
- National Science Foundation of China [21073069, 91023010, 21177048, 21103141]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0953]
- Fujian Provincial Key Laboratory of Photocatalysis-State Key Laboratory Breeding Base in Fuzhou University
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Noble metal nanoparticles (NPs) are often used as electron scavengers in conventional semiconductor photocatalysis to suppress electronhole (e-h+) recombination and promote interfacial charge transfer, and thus enhance photocatalytic activity of semiconductors. In this contribution, it is demonstrated that noble metal NPs such as Ag NPs function as visible-light harvesting and electron-generating centers during the daylight photocatalysis of AgBr@Ag. Novel Ag plasmonic photocatalysis could cooperate with the conventional AgBr semiconductor photocatalysis to enhance the overall daylight activity of AgBr@Ag greatly because of an interesting synergistic effect. After a systematic investigation of the daylight photocatalysis mechanism of AgBr@Ag, the synergistic effect was attributed to surface plasmon resonance induced local electric field enhancement on Ag, which can accelerate the generation of e-h+ pairs in AgBr, so that more electrons are produced in the conduction band of AgBr under daylight irradiation. This study provides new insight into the photocatalytic mechanism of noble metal/semiconductor systems as well as the design and fabrication of novel plasmonic photocatalysts.
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