Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 16, Pages 6602-6609Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp8111342
Keywords
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Funding
- New Energy and Industrial Technology Development Organization (NEDO) of Japan
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WO3 is known as a visible-light-responsive photocatalyst; however, WO3 has low activity for the photodegradation of organic substances in the absence of cocatalysts. The activity Of WO3 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/WO3 catalyst by means of XPS measurements, electrochemical measurements, and a layered model reaction, and we proposed a reaction mechanism Of CuO/WO3 in which CuO promotes oxygen reduction for WO3-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/WO3 photocatalyst showed higher activity for the photodegradation of acetaldehyde than did N-TiO2 and TiO2 under fluorescent-lamp irradiation simulating that used in indoor applications.
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