Development of The Third-generation Active Photocatalysts: Crystalline Shape-controlled Metal Oxide Particles

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Historically, semiconductor photocatalysts have been developed with the design of composition and crystalline structure (the first generation) and with that of particle size and specific surface area (the second generation). As the third-generation development of highly active photocatalysts, crystal morphology, which must be in relation with the crystal-lattice defects affecting the photocatalytic activity, is designed in this study. Here, titanium(IV) oxide (titania) particles exposing eight {101} facets and two {001} facets are prepared through gas-phase reaction of titanium(IV) chloride and oxygen, characterized mainly by X-ray diffraction measurement and examined their high photocatalytic activity in several reaction systems to clarify the effect of particle morphology on the photocatalytic activity.