Cited by 153TiO2 Photocatalysis and Solar CellsAdvanced Photocatalysis TechniquesPhotochemistry and Electron Transfer Studies

Photocatalysis of Dye-Sensitized TiO 2 Nanoparticles with Thin Overcoat of Al 2 O 3 : Enhanced Activity for H 2 Production and Dechlorination of CCl 4

Kim, Wooyul, Tachikawa, Takashi, Majima, Tetsuro, Choi, Wonyong·2009·The Journal of Physical Chemistry C

Abstract

Dye-sensitized TiO 2 nanoparticles that were loaded simultaneously with Pt and Al 2 O 3 overlayer (Al 2 O 3 /TiO 2 /Pt) were synthesized and investigated for photocatalytic activity under visible light. Introducing a thin Al 2 O 3 overlayer (∼1 nm thick) on dye-sensitized TiO 2 markedly enhanced the visible light activities for the production of hydrogen (in the presence of EDTA as an electron donor) and the dechlorination of CCl 4 . The Al 2 O 3 /TiO 2 /Pt powder was characterized by HRTEM, EDX, and XPS. In agreement with the photocatalytic activity data, the photocurrent collected via electron shuttles on a Pt electrode immersed in an aqueous photocatalyst suspension under visible light was also enhanced in the presence of an Al 2 O 3 overlayer, which indicates an enhanced interfacial electron transfer despite the presence of an insulating surface layer. The initial H 2 and chloride generation rate increased from 0.4 and 5 μM min −1 on TiO 2 /Pt to 0.9 and 7.5 μM min −1 on Al 2 O 3 /TiO 2 /Pt, respectively. The visible light activity of the sensitized photocatalytic reactions highly depended on the thickness of the alumina layer and was optimized at a low level of Al loading (Al/Ti atom ratio ∼ 0.01), above which the activity was markedly reduced with thickening of the layer. It is suggested that the alumina layer retards the charge recombination between the electron injected from the excited dye and the oxidized dye. The slower charge recombination in the presence of an alumina overlayer was confirmed by time-resolved diffuse reflectance (TDR) spectroscopy.

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Crossref · 10.1021/jp9008114

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Authors
Kim, W., Tachikawa, T., Majima, T., & Choi, W.
Affiliations
Pohang University of Science and Technology (KR)
Corresponding author
Choi, Wonyong
Venue
The Journal of Physical Chemistry C
Published
2009-05-21
Volume
113
Issue
24
Pages
10603-10609
ISSN
  • 1932-7447 (ISSN-L)
  • 1932-7455
OpenAlex
W2326451207
Cited by
153
References
33
Citations by year
2026: 4 · 2025: 1 · 2024: 3 · 2023: 6 · 2022: 11 · 2021: 7 · 2020: 10 · 2019: 1 · 2018: 7 · 2017: 13 · 2016: 13 · 2015: 11 · 2014: 19 · 2013: 15 · 2012: 12
FWCI
4.85
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Physical Chemistry C (publishedVersion)
  • Open Access System for Information Sharing (Pohang University of Science and Technology) (submittedVersion)
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › TiO2 Photocatalysis and Solar Cells
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
Keywords
visible light photocatalysis, photocatalytic hydrogen evolution, Pt cocatalyst, interfacial electron transfer, charge recombination

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