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Defect Chemistry of Titanium Dioxide. Application of Defect Engineering in Processing of TiO2-Based Photocatalysts
Abstract
The present work brings together the concepts of defect chemistry and photoelectrochemistry in order to consider TiO 2 -based photosensitive oxide semiconductors as photocatalysts for water purification. This paper reports the most recent progress in the defect chemistry of TiO 2 and its solid solutions with aliovalent ions forming donors and acceptors. The relationship between the defect-related properties, such as electrical and photocatalytic properties, are outlined. It is shown that reactivity, photoreactivity, and the related charge transfer of photocatalysts based on TiO 2 are determined by defect disorder and the related chemical potential of electrons. Therefore, defect chemistry may be used as a framework for the processing of well-defined TiO 2 -based photocatalysts. The photoreactivity of TiO 2 with water and its solutes is considered in terms of the effect of both collective and local properties. The effect of noble metals attached to TiO 2 as a separate phase, such as platinum, on photoelectrochemical properties and the related photocatalytic performance of TiO 2 is discussed. The key functional properties, which are responsible for the efficient conversion of solar energy into chemical energy (required for water purification), are outlined. The effect of TiO 2 doping with aliovalent ions on properties is considered in terms of the doping mechanisms and the related semiconducting properties. It is argued that comparison of the experimental data reported in the literature on the photocatalytic properties of TiO 2 dictates the need to establish standards for photocatalysts, which are well-defined. This paper reports the processing conditions of well-defined TiO 2 . It is argued that knowledge of the mass transport kinetic data, such as chemical and self-diffusion coefficients, is needed for selecting the optimal processing conditions.
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Metadata
- Authors
- Nowotny, M. K., Sheppard, L. R., Bak, T., & Nowotny, J.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2008-03-18
- Volume
- 112
- Issue
- 14
- Pages
- 5275-5300
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2042926775
- Cited by
- 591
- References
- 51
- FWCI
- 11.51
- Type
- journal article
- Language
- en
- Open access
- closed
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