Journal
ACS NANO
Volume 7, Issue 10, Pages 9287-9297Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn403954p
Keywords
photocatalysis; visible light; nanoparticles; alloy; titanium dioxide
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) [23360349]
- Grants-in-Aid for Scientific Research [23360349] Funding Source: KAKEN
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Visible light irradiation (lambda > 450 nm) of Pt-Cu bimetallic alloy nanoparticles (similar to 3-5 nm) supported on anatase TiO2 efficiently promotes aerobic oxidation. This Is facilicated via the interband excitation of Pt atoms by visible light followed by the transfer of activated electrons to the anatase conduction band. The positive charges formed on the nanoparticles oxidize substrates, and the conduction band electrons reduce molecular oxygen, promoting photocatalytic cycles. The apparent quantum yield for the reaction on the Pt-Cu alloy catalyst is similar to 17% under irradiation of 550 nm monochromatic light, which is much higher than that obtained on the monometallic Pt catalyst (similar to 7%). Cu alloying with Pt decreases the work function of nanopartides and decreases the height of the Schottky barrier created at the nanoparticle/anatase heterojunction. This promotes efficient electron transfer from the photoactivated nanoparticles to anatase, resulting in enhanced photocatalytic activity. The Pt-Cu alloy catalyst is successfully activated by sunlight and enables efficient and selective aerobic oxidation of alcohols at ambient temperature.
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