| Autor: |
Zhuangqun Huang, Craig L. Hill, Yurii V. Geletii, Tianquan Lian, David Wu, Chantelle L. Anfuso, Djamaladdin G. Musaev |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
SPIE Proceedings. |
| ISSN: |
0277-786X |
| Popis: |
Efficient solar-driven catalytic water oxidation is one of the main challenges in solar-to-fuel conversion. In this proceeding, we investigate three approaches for constructing electron acceptor -sensitizer - catalysts systems for photocatalytic water oxidation and our current understanding of the relevant fundamental processes involved. We demonstrated that an all-inorganic molecular water oxidation catalyst (WOC), [{Ru 4 O 4 (OH) 2 (H2O) 4 }(γ-SiW10O36)2]10- (or Ru 4 POM), catalyzed a homogenous O 2 evolution system with 27% quantum efficiency in homogeneous solution in the presence of sensitizer (Ru(bpy)3) and sacrificial electron donor. 1 This suggests the feasibility of a heterogeneous photoelectrochemical system in which the photoanode integrates all three components: electron acceptor, photosensitizer, and WOC. We prepare a photocatalytic electrode based on Ru 4 POM and a dye-sensitized nanoporous TiO 2 film for efficient light-harvesting and charge separation. Ultrafast spectroscopic studies of this triadic nanocomposite indicate efficient charge separation from the excited sensitizer to TiO 2 and efficient regeneration of the ground state of the dye. The latter can be attributed to Ru 4 POM oxidation by the photogenerated dye cation and has a yield of > 80% within 1 ns. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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