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A critical evaluation of the mode of incorporation of nitrogen in doped anatase photocatalysts.

Oropeza, FE; Harmer, J; Egdell, RG; Palgrave, RG; (2010) A critical evaluation of the mode of incorporation of nitrogen in doped anatase photocatalysts. Phys Chem Chem Phys , 12 (4) pp. 960-969. 10.1039/b914733k.

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Abstract

A range of sol-gel synthesis conditions were used to prepare high surface area N-doped TiO(2) in the anatase phase. The N dopant was derived either from NH(3) in solution or from NH(3) gas bubbled through solution. Bulk N doping levels were determined by an inert gas fusion method and were compared with surface N doping levels determined by X-ray photoelectron spectroscopy. Comparison was also made with the concentration of paramagnetic species measured by electron spin resonance spectroscopy. It was found that both surface and bulk doping levels were typically around 3 orders of magnitude higher than the concentration of paramagnetic N-containing species. All N-doped samples showed higher visible region (lambda > 395 nm) photocatalytic activity than undoped anatase itself. It is argued that catalytic activity is associated with the presence of nitrogen bound to lattice oxygen to give (NO)'O which can be photoexcited to give (NO)(O)(X).

Type: Article
Title: A critical evaluation of the mode of incorporation of nitrogen in doped anatase photocatalysts.
Location: England
DOI: 10.1039/b914733k
Keywords: Catalysis, Electron Spin Resonance Spectroscopy, Nitrogen, Oxygen, Photochemical Processes, Photoelectron Spectroscopy, Titanium
UCL classification: UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
URI: http://discovery.ucl.ac.uk/id/eprint/1360430
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