Efficient and affordable hydrogen production by water photo-splitting using TiO2-based photocatalysts

TiO2-based photocatalyst materials were synthesized through a sol-gel method, followed either by: (1) hydrothermal treatment (150 degrees C/24 h), or (2) heat treatment (calcination) in a temperature range between 400 and 900 degrees C. The resulting materials were characterized through BET, XRD, TEM, FTIR, RAMAN, laser diffraction and UV-Vis Diffuse Reflectance Spectroscopy. Photoactivity of the various materials was checked against photocatalytic water-splitting for hydrogen production and a relationship between TiO2 structure and hydrogen production capacity was identified. Optimum results were obtained for anataserutile mixtures in a ratio of 87:13. The activity of the home-made photocatalysts was also compared (under the same conditions) with the best commercially available materials which have been widely described in the literature: Hombikat UV100, Millenium PC100, Kronos vlp7000, Degussa P25 and Kemira 625. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.