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Long-lived Photoinduced Charge Separation for Dye-Sensitized Photoelectrosynthesis Cell (DSPEC)

Kyung-Ryang Wee
Department of Chemistry, Daegu University, Gyeongsan 712-714, Republic of Korea
In this presentation, we will introduce an artificial photosynthesis system for the solar fuel production from the water. Among the various artificial photosynthesis systems, we are focusing the dye-sensitized photoelectrochemical cell (DSPEC), which is molecular level light absorption and oxidation (or reduction) catalyst approaches. In the DSPEC, the achievement of long-lived photoinduced redox separation lifetimes has long been a central goal of molecular-based solar energy conversion strategies. The longer the redox-separation lifetime, the more time available for useful work to be extracted from the absorbed photon energy. Here we describe a novel strategy for dye-sensitized solar energy applications in which redox-separated lifetimes on the order of milliseconds to seconds can be achieved based on a simple toolkit of molecular components. Specifically, molecular chromophores (C), electron acceptors (A) and electron donors (D) were self-assembled on the surfaces of mesoporous, transparent conducting indium tin oxide nanoparticle (nanoITO) electrodes to prepare both photoanode (nanoITO|?밃?밅?밆) and photocathode (nanoITO|?밆?밅?밃) assemblies. Nanosecond transientabsorption and steady-state photolysis measurements show that the electrodes function microscopically as molecular analogues of semiconductor p/n junctions. These results point to a new chemical strategy for dye-sensitized solar energy conversion based on molecular excited states and electron acceptors/donors on the surfaces of transparent conducting oxide nanoparticle electrodes.
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