The surface plasmon resonance (SPR) effects of metal nanoparticles prove versatile in terms of equipping wideband-gap photocatalysts, such as TiO2, with visible-light responsiveness. In this regard, Au is the most frequently used material for its SPR, but alternative materials are also being actively developed to effectively utilize solar light from the visible to the near-infrared region. In this work, we found that Pt particles loaded on TiO2 were also active in effecting SPR-induced photocatalysis. Time-resolved absorption measurements confirmed that visible-light irradiation induces electron transfer from Pt to TiO2, and the efficiency of this electron injection increases as the wavelength of the incident light decreases from 660 to 450 nm. Observations of the peak shift of the vibrational frequency of adsorbed CO on Pt confirmed that the Fermi level of Pt decreases as the electron transfer from Pt to TiO2 proceeds. These results imply that Pt nanoparticles can act as sensitizers to induce electron transfer from Pt to TiO2, although Pt is a well-known cocatalyst that enhances H2 evolution by collecting electrons from TiO2. However, as the intensity of the irradiated light increased beyond 50 mW cm−2, a portion of the Pt particles started to capture the injected electrons from TiO2, suggesting that the electron transfer from one Pt particle to the other Pt particles via the conduction band of TiO2 proceeds under visible light illumination. These opposing roles may be ascribed to the variation in the size of Pt particles as well as density of electrons injected into TiO2.
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27 September 2021
Research Article|
September 30 2021
Forward and backward electron transfer on Pt loaded TiO2 photocatalysts under visible-light illumination
Special Collection:
Materials for Renewable Fuels Production
Naohiro Inoue;
Naohiro Inoue
1
Graduate School of Engineering, Toyota Technological Institute
, 2-12-1 Hisakata, Tempaku-ku, Nagoya 468-8511, Japan
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Kyohei Shiraki;
Kyohei Shiraki
1
Graduate School of Engineering, Toyota Technological Institute
, 2-12-1 Hisakata, Tempaku-ku, Nagoya 468-8511, Japan
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Kosaku Kato
;
Kosaku Kato
1
Graduate School of Engineering, Toyota Technological Institute
, 2-12-1 Hisakata, Tempaku-ku, Nagoya 468-8511, Japan
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Shu Ashimura;
Shu Ashimura
2
Department of Applied Chemistry, Graduate School of Sciences and Technology for Innovation, Yamaguchi University
, 2-16-1 Tokiwadai, Ube 755-8611, Japan
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Masaaki Yoshida
;
Masaaki Yoshida
2
Department of Applied Chemistry, Graduate School of Sciences and Technology for Innovation, Yamaguchi University
, 2-16-1 Tokiwadai, Ube 755-8611, Japan
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Akira Yamakata
Akira Yamakata
a)
1
Graduate School of Engineering, Toyota Technological Institute
, 2-12-1 Hisakata, Tempaku-ku, Nagoya 468-8511, Japan
3
Institute for Catalysis, Hokkaido University
, Kita 21, Nishi 10, Kita-ku, Sapporo 001-0021, Japan
a)Author to whom correspondence should be addressed: yamakata@toyota-ti.ac.jp
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a)Author to whom correspondence should be addressed: yamakata@toyota-ti.ac.jp
Note: This paper is part of the APL Special Collection on Materials for Renewable Fuels Production.
Appl. Phys. Lett. 119, 133905 (2021)
Article history
Received:
July 29 2021
Accepted:
September 14 2021
Citation
Naohiro Inoue, Kyohei Shiraki, Kosaku Kato, Shu Ashimura, Masaaki Yoshida, Akira Yamakata; Forward and backward electron transfer on Pt loaded TiO2 photocatalysts under visible-light illumination. Appl. Phys. Lett. 27 September 2021; 119 (13): 133905. https://doi.org/10.1063/5.0065074
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