Electronic coupling in iron oxide-modified TiO2 leads to a reduced band gap and charge separation for visible light active photocatalysis
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Date
2011-09-15
Authors
Nolan, Michael
Journal Title
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Publisher
Royal Society of Chemistry
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Abstract
In recent experiments Tada et al. have shown that TiO2 surfaces modified with iron oxide display visible light photocatalytic activity. This paper presents first principles simulations of iron oxide clusters adsorbed at the rutile TiO2 (110) surface to elucidate the origin of the visible light photocatalytic activity of iron oxide modified TiO2. Small iron oxide clusters adsorb at rutile (110) surface and their presence shifts the valence band so that the band gap of the composite is narrowed towards the visible, thus confirming the origin of the visible light activity of this composite material. The presence of iron oxide at the TiO2 surface leads to charge separation, which is the origin of enhanced photocatalytic efficiency, consistent with experimental photoluminesence and photocurrent data. Surface modification of a metal oxide is thus an interesting route in the development of visible light photocatalytic materials.
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Keywords
Photocatalysis , Augmented-wave method , Titanium dioxide , Doped TiO2 , Catalytic activity , Anatase TiO2 , Surfaces , Density , Rutile , Films , Ceria , Density functional theory
Citation
Nolan, M. (2011) 'Electronic coupling in iron oxide-modified TiO2 leads to a reduced band gap and charge separation for visible light active photocatalysis', Physical Chemistry Chemical Physics, 13(40), pp. 18194-18199. doi: 10.1039/c1cp21418g
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© the Owner Societies 2011. This is the accepted manuscript version of an article published in Physical Chemistry Chemical Physics. The version of record is available at http://dx.doi.org/10.1039/C1CP21418G