A Systematic Study on the Double-Layered Photosensitizing Dye Structure on the Surface of Pt-Cocatalyst-Loaded TiO2 Nanoparticles

We have systematically prepared three kinds of photosensitizing (PS) double layers on the surface of Pt-cocatalyst-loaded TiO2 (Pt-TiO2) nanoparticles by using four different phosphonate-functionalized Ru(II) polypyridine photosensitizers (Ru) and Zr4+ cation linkers to improve the photo-induced sep...

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Bibliographic Details
Published in:Bulletin of the Chemical Society of Japan 2019, Vol.92 (11), p.1793-1800
Main Authors: Yoshimura, Nobutaka, Kobayashi, Atsushi, Yoshida, Masaki, Kato, Masako
Format: Article
Language:English
Subjects:
Ascorbic acid
Catalytic activity
Dyes
Energy transfer
Nanoparticles
Phosphonates
Photocatalysis
Photoexcitation
Ruthenium
Titanium dioxide
Vitamin C
Zirconium
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Summary:We have systematically prepared three kinds of photosensitizing (PS) double layers on the surface of Pt-cocatalyst-loaded TiO2 (Pt-TiO2) nanoparticles by using four different phosphonate-functionalized Ru(II) polypyridine photosensitizers (Ru) and Zr4+ cation linkers to improve the photo-induced separation efficiency at the double-PS-layer and semiconductor interface. All three nanoparticles with double-PS-layer structure (Ru-Zr-Ru@Pt-TiO2) exhibited remarkably higher photocatalytic H2 evolution activity than that of single-PS-layer nanoparticles, Ru@Pt-TiO2 in low sacrificial electron donating (SED) l-ascorbic acid solution. The fine-tuning of emission energy of Ru(II) PS dye at the outer surface of Ru-Zr-Ru@Pt-TiO2 nanoparticle revealed that photoexcitation energy transfer from outer to inner Ru(II) PS dyes give a positive effect on the photocatalytic activity especially in the low SED concentration.
ISSN:0009-2673
1348-0634
DOI:10.1246/bcsj.20190164