Visible-Light-Active Titania Photocatalysts: The Case of N-Doped s—Properties and Some Fundamental Issues

By A. Emeline, V. N. Kuznetsov, Vladimir K. Rybchuk, N. Serpone. 2008

195 citations recorded by the source corpus.

This article briefly reviews some factors that have impacted heterogeneous photocatalysis with next generation photocatalysts, along with some issues of current debate in the fundamental understanding of the science that underpins the field. Preparative methods and some characteristics features of N-doped are presented and described briefly. At variance are experimental results and interpretations of X-ray photoelectron spectra (XPS) with regard to assignments of N 1s binding energies in N-doped systems. Relative to pristine nominally clean with absorption edges at 3.2 eV (anatase) and 3.0 eV (rutile), N-doped s display red-shifted absorption edges into the visible spectral region. Several workers have surmised that the (intrinsic) band gap of is narrowed by coupling dopant energy states with valence band (VB) states, an inference based on DFT computations. With similar DFT computations, others concluded that red-shifted absorption edges originate from the presence of localized intragap dopant states above the upper level of the VB band. Recent analyses of absorption spectral features in the visible region for a large number of doped specimens, however, have suggested a common origin owing to the strong similarities of the absorption features, and this regardless of the preparative methods and the nature of the dopants. The next generation of (doped) photocatalysts should enhance overall process photoefficiencies (in some cases), since doped s absorb a greater quantity of solar radiation. The fundamental science that underpins heterogeneous photocatalysis with the next generation of photocatalysts is a rich playing field ripe for further exploration.

Subfields: Materials Chemistry, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/7408dc9828dafefdff68b65d68838ba68199c7d8

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Citations in the corpus

Toward solar fuels: photocatalytic conversion of carbon dioxide to hydrocarbons. (2010, background): “It appears that the nitrogen doping creates trap states, such as Ti(3) within the TiO2 band gap,(154,155) that in turn lead to unwanted charge recombination.(156,157) Before concluding, we would like to make a comment on an article published recently by Wang et al.”
Self-assembly and photocatalysis of mesoporous TiO2 nanocrystal clusters (2011, background): “[27] Emeline, A.”