Electron source in photoinduced hydrogen production on Pt-supported TiO particles
Journal of Physical Chemistry B, ISSN: 1520-6106, Vol: 103, Issue: 7, Page: 1119-1123
1999
- 114Citations
- 59Captures
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Article Description
Photoinduced reaction in relations to water photolysis was studied on Pt- or other catalysts-supported TiO (P-25) particles. It was found that stoichiometric H and O formation does not take place with the photocatalyst, and only H production was observed. A long-term water photolysis was carried out by Pt-supported TiO (TiO/Pt) to produce H, in which H formation stopped almost after 600 h irradiation. After recovering the TiO/Pt particles used in the long-term reaction, they were reused in a photocatalytic H reduction by adding methanol as an electron donor, but no H production was observed showing that the TiO/Pt particles have lost their photocatalytic activity after the long-term reaction. These results suggest that TiO itself works as an electron donor to produce H. Structural change of the TiO/Pt have been studied by both X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) before and after the photoreaction. In both the XRD and XPS, the structure of the original TiO almost disappeared after the photoreaction and new structures appeared, showing that Ti changed irreversibly to a higher valance state (Ti) after producing H. © 1999 American Chemical Society.
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