Abstract
Two photocatalytic systems consisting of spatially organized electron donor/photosensitizer/oxide semiconductor/catalyst assemblies are described. The first consists of an aluminosilicate zeolite (mordenite or zeolite L) containing Pt clusters, methylviologen, and titanium oxide within the linear channels, together with a sizes-excluded photosensitizer RuL32+ (L = 4.4–dicarboxy–2,2–bipyridine) adsorbed at the TiO2 surface. The kinetics of photochemical charge separation and hydrogen evolution in the presence of sacrificial electron donors are reported. In the second system, a layered oxide semiconductor, K4−xHxNb6O17⋅nH2O, replaces the zeolite/TiO2/MV2+ composite. Using adsorbed RuL3 and visible light excitation, this material decomposes acidic iodide solutions into H2 and I3− with a quantum efficiency of 0.3 %.
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Acknowledgement
We thank Drs. Anthony Harriman and Bruce Parkinson for helpful discussions. This work was supported by the Division of Energy, under contract DE-FG05-87ER13789. Flash photolysis experiments were carried out at the Center for Fast Kinetics Research, University of Texas at Austin. CFKR is supported jointly by the Biomedical Research Technology Program of the Division of Research Resources of NIH (RR00886) and by the University of Texas at Austin. T.E.M. thanks the Camille and Henry Dreyfus Foundation for support in the form of a Teacher-Scholar Award.
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Il Kim, Y., Riley, R.L., Huq, M.J. et al. Zeolitic Materials as Organizing Media for Semiconductor-Based Artificial Photosynthetic Systems. MRS Online Proceedings Library 233, 145–156 (1991). https://doi.org/10.1557/PROC-233-145
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DOI: https://doi.org/10.1557/PROC-233-145