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Proceedings Paper

Surface characteristics and electronic structure of photocatalytic reactions on TiO2 and doped TiO2 nanoparticles
Author(s): L. Österlund; A. Mattsson
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Paper Abstract

A molecular approach to understand the photocatalytic degradation of small organic molecules adsorbed from the gas phase on anatase, rutile and doped TiO2 nanoparticles is presented. Using in situ Fourier transform infrared (FTIR) spectroscopy and mass spectrometry the rate determining steps for the photocatalytic degradation of formic acid, acetone and propane are unraveled. Key intermediates are identified and correlated to structural properties of the TiO2 nanoparticles. Specifically, stable bridging bidentate carboxylate (R-CO2) and (bi)carbonate species forms preferentially on rutile particles, and are proposed to inhibit the total photodegradation efficiency. In particular, the concentration of R-CO2 is found to decrease with increasing size of the anatase particles, and may at least partly explain why Degussa P25 is a good photocatalyst. Means to avoid R-CO2 site-blocking is discussed. Improved solar light efficiencies are difficulty to achieve in cation doped TiO2 despite higher visible light absorption and stronger adsorbate-surface interactions.

Paper Details

Date Published: 31 August 2006
PDF: 15 pages
Proc. SPIE 6340, Solar Hydrogen and Nanotechnology, 634003 (31 August 2006); doi: 10.1117/12.680304
Show Author Affiliations
L. Österlund, FOI NBC Defense (Sweden)
A. Mattsson, FOI NBC Defense (Sweden)

Published in SPIE Proceedings Vol. 6340:
Solar Hydrogen and Nanotechnology
Lionel Vayssieres, Editor(s)

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