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

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  • Nobutaka Yoshimura
    Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, Hokkaido 060-0810 , Japan
  • Atsushi Kobayashi
    Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, Hokkaido 060-0810 , Japan
  • Masaki Yoshida
    Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, Hokkaido 060-0810 , Japan
  • Masako Kato
    Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, Hokkaido 060-0810 , Japan

抄録

<jats:title>Abstract</jats:title> <jats:p>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.</jats:p>

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