| Autor: |
Higashida Y; Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo 060-0810, Japan., Takizawa SY; Department of Basic Science, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan., Yoshida M; Department of Applied Chemistry for Environment, School of Biological and Environmental Sciences, Kwansei Gakuin University, 1 Gakuen Uegahara, Sanda, Hyogo 669-1330, Japan., Kato M; Department of Applied Chemistry for Environment, School of Biological and Environmental Sciences, Kwansei Gakuin University, 1 Gakuen Uegahara, Sanda, Hyogo 669-1330, Japan., Kobayashi A; Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo 060-0810, Japan. |
| Abstrakt: |
Dye-sensitized H 2 evolution photocatalysts have attracted considerable attention as promising systems for the photochemical generation of H 2 from water. In this study, to mimic the reaction field of natural photosynthesis artificially, we synthesized a hydrophobic Ru(II) dye-sensitized Pt-TiO 2 nanoparticle photocatalyst, RuC 9 @Pt-TiO 2 ( RuC 9 = [Ru(dC 9 bpy) 2 (H 4 dmpbpy)] 2+ ; dC 9 bpy = 4,4'-dinonyl-2,2'-bipyridine, H 4 dmpbpy = 4,4'-dimethyl phosphonic acid-2,2'-bipyridine), and integrated it into 1,2-dipalmitoyl- sn -glycero-3-phosphocholine (DPPC) lipid bilayer vesicle membranes. The photocatalytic H 2 production activity in 0.5 M l-ascorbic acid aqueous solution enhanced by more than three times in the presence of DPPC vesicles (apparent quantum yield = 2.11%), whereas such a significant enhancement was hardly observed when the vesicle formation was omitted. These results indicate that the highly dispersed state of the hydrophobic RuC 9 @Pt-TiO 2 nanoparticles in the DPPC bilayer vesicles is a key factor in achieving enhanced photocatalytic H 2 production activity in aqueous solution. |
