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Title: Atomic N modified rutile TiO2(110) surface layer with significant visible light photoactivity
Authors: Tao, J.
Yang, M. 
Chai, J.W.
Pan, J.S.
Feng, Y.P. 
Wang, S.J.
Issue Date: 16-Jan-2014
Citation: Tao, J., Yang, M., Chai, J.W., Pan, J.S., Feng, Y.P., Wang, S.J. (2014-01-16). Atomic N modified rutile TiO2(110) surface layer with significant visible light photoactivity. Journal of Physical Chemistry C 118 (2) : 994-1000. ScholarBank@NUS Repository.
Abstract: It has been recently emphasized that the surface of a photocatalyst plays crucial roles on its photocatalytic performance. By nitridizing the top layer of the rutile TiO2(110) surface using reactive atomic N flux, we report direct experimental evidence of significantly enhanced photocatalytic activity under both ultraviolet (UV) and visible light irradiations. The visible light activity of a nitridized surface is found to be comparable to the UV light activity of the pristine surface. On the basis of X-ray photoemission spectroscopy (XPS) measurements and density-functional theory (DFT) calculations, top surface N doping efficiently narrows the local band gap, ∼2.0 eV, which accounts for the visible light activity. Under visible light excitation, nearly all free charges contribute to the photocatalytic reactions. The improvement of photocatalytic activity is attributed to the N 2p add-on shoulder at the valence band maximum (VBM) as well as the strong exchange-splitting at the surface that settles the N 2pz states inside the conduction band of the TiO2 matrix, which avails efficient charge transfer. © 2013 American Chemical Society.
Source Title: Journal of Physical Chemistry C
ISSN: 19327447
DOI: 10.1021/jp408798f
Appears in Collections:Staff Publications

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