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




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International Journal of PhotoenergyVolume 2008 2008, Article ID 258394, 19 pages

Review Article

Department of Photonics, Fock Research Institute of Physics, St. Petersburg State University, St. Petersburg, Russia

Dipartimento di Chimica Organica, Universita di Pavia, Via Taramelli 10, Pavia 27100, Italy

Received 13 September 2007; Revised 14 October 2007; Accepted 12 November 2007

Academic Editor: M. Sabry A. Abdel-Mottaleb

Copyright © 2008 Alexei V. Emeline et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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.





Autor: Alexei V. Emeline, Vyacheslav N. Kuznetsov, Vladimir K. Rybchuk, and Nick Serpone

Fuente: https://www.hindawi.com/



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