Abstract
The effect of photocatalytic activity of CO oxidation on Pt/TiO 2 catalysts under oxidizing atmosphere was investigated. A strong metal-support interaction (SMSI) between Pt and TiO 2 have been found by means of XPS and in situ Ar + sputtering test after Pt/TiO 2 films being calcinated at 673 K under oxygen for 2 h, which was also corroborated by the photoelectrochemical measurement. When Pt/TiO 2 catalysts were calcinated at 673 K in air, the SMSI between Pt and TiO 2 occurred. Pt atoms on the surface thermally diffuse into the lattice of TiO 2 grains, and then the contact resistance on the interface decreases. The migration velocity of the photo-generated electrons from the surface of TiO 2 to Pt particles increases, which may bring out the enhancement of the photocatalytic activity of CO oxidation.
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