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Electrochemically assisted photocatalysis on anodic titania nanotubes

Dale, GR, Hamilton, JWJ, Dunlop, PSM and Byrne, JA (2009) Electrochemically assisted photocatalysis on anodic titania nanotubes. Current Topics in Electrochemistry, 14 . pp. 89-97. [Journal article]

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URL: http://www.researchtrends.net/tia/title_issue.asp?id=19&in=0&vn=14&type=3


Heterogeneous photocatalysis is a clean technology where light energy is used to drive redox processes on the surface of semiconductors. Applications include the photoelectrolysis of water, organic synthesis, carbon dioxide fixation, ‘self-cleaning’ surfaces, and the treatment of polluted air and water. Titanium dioxide is the most suitable photocatalyst for water treatment applications because it is chemically and photochemically stable, non toxic, photoactive against a wide range of organic pollutants, inexpensive and readily available. The high photocatalytic activity is largely due to the wide band gap giving a large potential window to drive redox reactions, although this requires UV excitation. Nano-engineering of photocatalytic materials may improve the efficiency of the process. Self-organised, vertically aligned, titania nanotubes were grown by the electrochemical oxidation of titanium metal in the presence of fluorine ions. These materials were compared with compact oxide and nanoparticle (Degussa P25) electrodes for the photocatalytic and electrochemically assisted photocatalytic degradation of phenol and formic acid as model pollutants. It was found that ‘as-prepared’ nanotube films did not give any improvement in efficiency, however, following a post-growth anneal step to improve crystallinity, the nanotube films out-performed both the compact oxide and nano-particulate electrodes for the electrochemically assisted photocatalytic degradation of formic acid and phenol. The improvement in performance is due to the nanostructure providing a high surface area for reaction, aligned channels for mass transfer of reactants and products to and from the surface, efficient hole transfer to solution and good electron transfer to the contact electrode

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:17544
Deposited By: Dr Patrick Dunlop
Deposited On:22 Mar 2011 11:37
Last Modified:09 Dec 2015 10:55

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