Acceleration of Oxidations and Retardation of Reductions in Photocatalysis of a TiO[sub 2]/SnO[sub 2] Bilayer-Type Catalyst

Abstract

An anatase film (75 ± 5 nm thick) was formed on film (580 ± 80 nm thick) coated soda‐lime glass by a sol‐gel method . Depth profiles of the compositions determined by X‐ray photoelectron spectroscopy confirmed that the amounts of and ions are negligibly small throughout the film. The activities for four kinds of photocatalytic reactions (v) were examined under no external applied potential in comparison with those of a standard sample . The bilayer‐type photocatalyst showed remarkably higher activities for oxidations , whereas the activities for reductions are lower . These results could be explained by efficient charge separation via the interfacial electron transfer from to . © 2000 The Electrochemical Society. All rights reserved.