Surface characteristics and electronic structure of photocatalytic reactions on TiO2 and doped TiO2 nanoparticles

L. Österlund; A. Mattsson

doi:10.1117/12.680304

31 August 2006 Surface characteristics and electronic structure of photocatalytic reactions on TiO₂ and doped TiO₂ nanoparticles

L. Österlund, A. Mattsson

Author Affiliations +

Proceedings Volume 6340, Solar Hydrogen and Nanotechnology; 634003 (2006) https://doi.org/10.1117/12.680304
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

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.

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L. Österlund and A. Mattsson "Surface characteristics and electronic structure of photocatalytic reactions on TiO₂ and doped TiO₂ nanoparticles", Proc. SPIE 6340, Solar Hydrogen and Nanotechnology, 634003 (31 August 2006); https://doi.org/10.1117/12.680304

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