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Light and dark oxidation processes of organic compounds involving H

The addition of Li to Ti02-based anatase enhances considerably the activity of this type of catalyst. Evidence is presented here for the influence of ion doping on the observed charge-transfer processes on the catalyst surface. It shows that Li doping promotes conduction band electron transfer. This effect is likely to contribute to the observed enhancement in hydrogen generation and oxygen photoadsorption with increased Li content. Electron microscopy and other structure studies show that Li diffuses into the anatase bulk, altering the structure of this material. Implications of such alterations in water photocleavage under UV light are discussed. Displacement of the conduction band to more positive values takes place upon Li doping of Ti02 samples.

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