| 초록 |
In the course of developing an efficient dye-sensitized photocatalytic system for selective CO2 reduction, we found that detachment of metal-oxide-bound chromophores, which is one of the challenges to operation of the dye-sensitized system, can be greatly inhibited by growing via atomic layer deposition (ALD), and ultrathin transparent metal-oxide coating (e.g. TiO2) on the surface of TiO2 NPs that are already dye loaded. In addition to imparting stability, it is discovered that ALD post-treatment enhances energy-conversion efficiencies, but this strategy was not further explored in the current hybrid system (Dye/TiO2/ReC). Naturally, it is expected that the additional coverage by metal oxides could provide a means to not only efficiently reduce the intermolecular interaction of dyes, but also to retard the interfacial charge recombination dynamics, which lead to a significant improvements in catalytic activity. Herein, we demonstrate a systematic study for the development of high-performance catalytic system based on hybrid material (Re-complex as a reduction catalyst and porphyrin dye for efficient light harvesting) with post-assembly atomic layer deposition technique and the variation of anchoring group.
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