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Influence of Excitation Wavelength (UV or Visible Light) on the Photocatalytic Activity of Titania Containing Gold Nanoparticles for the Generation of Hydrogen or Oxygen from Water

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Gomes Silva, Cláudia, Juárez, Raquel, Marino, Tiziana, Molinari, Raffaele, García, Hermenegildo·2011·Journal of the American Chemical Society
DOI 10.1021/ja1086358
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Abstract

Gold nanoparticles supported on P25 titania (Au/TiO(2)) exhibit photocatalytic activity for UV and visible light (532 nm laser or polychromatic light λ > 400 nm) water splitting. The efficiency and operating mechanism are different depending on whether excitation occurs on the titania semiconductor (gold acting as electron buffer and site for gas generation) or on the surface plasmon band of gold (photoinjection of electrons from gold onto the titania conduction band and less oxidizing electron hole potential of about -1.14 V). For the novel visible light photoactivity of Au/TiO(2), it has been determined that gold loading, particle size and calcination temperature play a role in the photocatalytic activity, the most active material (Φ(H2) = 7.5% and Φ(O2) = 5.0% at 560 nm) being the catalyst containing 0.2 wt % gold with 1.87 nm average particle size and calcined at 200 °C.

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Cited by

Metadata

Authors
Gomes Silva, C., Juárez, R., Marino, T., Molinari, R., & García, H.
Venue
Journal of the American Chemical Society
Publisher
American Chemical Society (ACS)
Published
2010-12-13
Volume
133
Issue
3
Pages
595-602
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
DOI
10.1021/ja1086358
OpenAlex
W2085086110
Cited by
1,003
References
2
FWCI
26.24
Type
journal article
Language
en
Open access
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