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HomeMaterials Science ForumMaterials Science Forum Vol. 757Metal Doped TiO2 Photocatalysts for CO2...

Metal Doped TiO₂ Photocatalysts for CO₂ Photoreduction

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Abstract:

Greenhouse gases such as CO₂, CH₄ and CFCs are the primary causes of global warming. Worldwide, people are exploring techniques to reduce, capture, store CO₂gas and even convert this gas in to some useful chemicals. CO₂ can be transformed into hydrocarbons in a photocatalytic reaction. The advantage of photo reduction of CO₂ is to use inexhaustible solar energy. Knowledge of elementary steps in photocatalytic CO₂ reduction under UV irradiation is required in order to improve the photo efficiency of the photocatalyst. A semiconductor photocatalyst mediating CO₂ reduction and water oxidation needs to absorb light energy, generate electron hole pairs, spatially separate them, transfer them to redox active species across the interface and minimize electron hole recombination. This requires the semiconductor to have its conduction band electrons at higher energy compared to the CO₂ reduction potential while the holes in the valence band need to be able to oxidize water to O₂. A single semiconductor does not usually satisfy these requirements. Some recent developments in this field have been moves towards rational photocatalyst design, the use of highly active isolated Ti-species in mesoporous and microporous materials, metal-doping of TiO₂, development of catalysts active at longer wavelengths than can be achieved with commercially available titania etc. The use of transition-metal loaded titanium dioxide (TiO₂) has been extensively studied as a photocatalyst in photoreactions. Unlike traditional catalysts drive chemical reactions by thermal energy, semiconducting photocatalysts can induce chemical reactions by inexhaustible sunlight and convert CO₂ in to the useful hydrocarbons. In this review article we will cover different aspects of metal doped nano structured TiO₂ photocatalysts, used to convert/reduce CO₂ in to useful hydrocarbons.

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Periodical:

Materials Science Forum (Volume 757)

Pages:

243-256

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.757.243

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Online since:

May 2013

Authors:

Amir Al-Ahmed

Keywords:

CO₂ Photoreduction, Metal Doped TiO₂, Photocatalyst, Renewable Energy, TiO₂

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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