Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 28, Pages 9842-9845Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja504097v
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Funding
- NSF [CHE-1308611]
- NSF under CCI Center for Nanostructured Electronic Materials [CHE-1038015]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- Department of Energy's Office of Biological and Environmental Research located at Pacific Northwest National Laboratory
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1308644] Funding Source: National Science Foundation
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Water reduction under two different visible-light ranges (lambda > 400 nm and lambda > 435 nm) was investigated in gold-loaded titanium dioxide (Au-TiO2) heterostructures with different sizes of Au nanoparticles (NPs). Our study clearly demonstrates the essential role played by Au NP size in plasmon-driven H2O reduction and reveals two distinct mechanisms to clarify visible-light photocatalytic activity under different excitation conditions. The size of the Au NP governs the efficiency of plasmon-mediated electron transfer and plays a critical role in determining the reduction potentials of the electrons transferred to the TiO2 conduction band. Our discovery provides a facile method of manipulating photocatalytic activity simply by varying the Au NP size and is expected to greatly facilitate the design of suitable plasmonic photocatalysts for solar-to-fuel energy conversion.
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