using heterostructured catalysts
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United States of America Patent
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Mar 24, 2015
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app pub date -
Oct 13, 2010
filing date -
Oct 14, 2009
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Abstract
The method provides for use of sensitized photocatalyst for the photocatalytic reduction of CO2 under visible light illumination. The photosensitized catalyst is comprised of a wide band gap semiconductor material, a transition metal co-catalyst, and a semiconductor sensitizer. The semiconductor sensitizer is photoexcited by visible light and forms a Type II band alignment with the wide band gap semiconductor material. The wide band gap semiconductor material and the semiconductor sensitizer may be a plurality of particles, and the particle diameters may be selected to accomplish desired band widths and optimize charge injection under visible light illumination by utilizing quantum size effects. In a particular embodiment, CO2 is reduced under visible light illumination using a CdSe/Pt/TiO2 sensitized photocatalyst with H2O as a hydrogen source.
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