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- Title
Enhancement of Photocatalytic Activity for Hydrogen Production by Surface Modification of Pt‐TiO<sub>2</sub> Nanoparticles with a Double Layer of Photosensitizers.
- Authors
Yoshimura, Nobutaka; Kobayashi, Atsushi; Yoshida, Masaki; Kato, Masako
- Abstract
To investigate the effect of the surface structure of dye‐sensitized photocatalyst nanoparticles, we prepared three types of RuII‐photosensitizer (PS)‐double‐layered Pt‐cocatalyst‐loaded TiO2 nanoparticles with different surface structures, Zr‐RuCP6‐Zr‐RuP6@N wt %Pt‐TiO2, RuCP6‐Zr‐RuP6@N wt %Pt‐TiO2, and RuCP2‐Zr‐RuP6@N wt %Pt‐TiO2 (N=0.2, 1, and 5), and evaluated their photocatalytic H2 evolution activity in the presence of redox‐reversible iodide as the electron donor. Although the driving force of the electron injection from I− to the photo‐oxidized RuIII PS is comparable, the activity increased in the following order: RuCP2‐Zr‐RuP6@1 wt %Pt‐TiO2 < RuCP6‐Zr‐RuP6@1 wt %Pt‐TiO2 < Zr‐RuCP6‐Zr‐RuP6@1 wt %Pt‐TiO2. The apparent quantum yield of Zr‐RuCP6‐Zr‐RuP6@1 wt %Pt‐TiO2 in the first hour reached 1 %. Zeta‐potential measurements suggest that the surface Zr4+‐phosphate groups attracted I− anions to the nanoparticle–solution interface. Our results indicate that the surface modification of dye‐sensitized photocatalysts is a promising approach to enhance photocatalytic activity with various redox mediators.
- Subjects
ELECTRON donors; HYDROGEN production; PHOTOCATALYSTS; PHOTOSENSITIZERS; SURFACE structure; NANOPARTICLES; TITANIUM dioxide
- Publication
Chemistry - A European Journal, 2020, Vol 26, Issue 70, p16939
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.202003990