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The effect of pyridyl anchoring groups at the surfaces of Ru(II)-dyesensitized TiO2 nanoparticles on photocatalytic oxygen evolution
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| Title: | The effect of pyridyl anchoring groups at the surfaces of Ru(II)-dyesensitized TiO2 nanoparticles on photocatalytic oxygen evolution |
| Authors: | Otsuka, Hiroki Browse this author | | Kobayashi, Atsushi Browse this author | | Yoshida, Masaki Browse this author →KAKEN DB | | Kato, Masako Browse this author →KAKEN DB |
| Keywords: | Photocatalyst | | Water oxidation | | Dye-sensitization | | Artificial photosynthesis | | Ru(II) complex |
| Issue Date: | 15-Jan-2019 |
| Publisher: | Elsevier |
| Journal Title: | Journal of photochemistry and photobiology a-chemistry |
| Volume: | 369 |
| Start Page: | 189 |
| End Page: | 194 |
| Publisher DOI: | 10.1016/j.jphotochem.2018.10.019 |
| Abstract: | Photocatalytic oxygen evolution driven by two pyridyl-anchor-modified Ru(II) photosensitizers, namely [Ru (bpy)(2)(qpy)](PF6)(2) and [Ru(qpy)(3)](PF6)(2) (RuPy2 and RuPy6; bpy = 2,2'-bipyridine, qpy = 2,2'-4,4 ''-4',4'"-quaterpyridine), was examined in order to investigate the influence of pyridyl groups as the connectors that bind both the water-oxidation and water-reduction catalysts. RuPy2 and RuPy6 act as redox photosensitizers in the presence of the S2O82- sacrificial electron acceptor and the K2xCo(3-x)[Fe(CN)(6)](2)center dot nH(2)O, Prussian-blue-type, water-oxidation catalyst; however, their photosensitizing efficiencies were lower than that of [Ru(bpy)(3)](2+) because of their lower reactivities with S2O82-, probably due to steric hindrance associated with the pyridyl groups. Interestingly, the photosensitizing efficiency of RuPy2 was significantly improved through immobilization on TiO2 nanoparticles (RuPy2@TiO2), while the efficiency of RuPy6 was hardly improved by immobilization. These contrasting results indicate that the surface structure of the photosensitizer-immobilized nanoparticle is a crucial factor that determines photosensitizing and/or photocatalytic activity. |
| Rights: | ©2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/80197 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 小林 厚志
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