The Journal of Physical Chemistry C · 2009 · 124 citations · 33 references
Natural SciencesChemical EngineeringMaterials ScienceCatalysisInorganic ChemistryReaction EngineeringCatalytic MaterialsPhotocatalysisPhotochemistryRedox CatalysisRedox ChemistryRedox ReactionsCatalyst MechanismsElectrochemical MeasurementsOxygen Reduction CatalystsOxygen Reduction ReactionPhotocatalytic DegradationPhotocatalytic MaterialsPhotocatalytic OxidationVisible-light Photocatalysis
WO 3 is known as a visible-light-responsive photocatalyst; however, WO 3 has low activity for the photodegradation of organic substances in the absence of cocatalysts. The activity of WO 3 was significantly improved by the loading of CuO as a cocatalyst, and this catalyst system can be used practically because it is inexpensive and easy to prepare. We investigated the properties of a CuO/WO 3 catalyst by means of XPS measurements, electrochemical measurements, and a layered model reaction, and we proposed a reaction mechanism of CuO/WO 3 in which CuO promotes oxygen reduction for WO 3 -catalyzed photodegradation by the Cu(II)/Cu(I) redox reaction. Furthermore, the oxygen reduction reaction over CuO was improved by light irradiation of CuO. The optimized CuO/WO 3 photocatalyst showed higher activity for the photodegradation of acetaldehyde than did N-TiO 2 and TiO 2 under fluorescent-lamp irradiation simulating that used in indoor applications.
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Visible-Light Photocatalysis in Nitrogen-Doped Titanium Oxides
Ryoji Asahi, Takeshi Morikawa, Takeshi Ohwaki et al. · Science · 2001 · 12.2K citations