Quantum yield with platinum modified TiO2 photocatalyst for hydrogen production (original) (raw)
2013, Applied Catalysis B: Environmental
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Hydrogen production using Pt-loaded TiO2 photocatalysts
International Journal of Hydrogen Energy, 2013
A series of synthesised TiO 2-based and commercial photocatalysts were modified by Pt photodeposition and a study made of their photocatalytic activity in hydrogen production. The modified commercial photocatalysts were Evonik P25, Kronos vlp7000 and Hombikat UV-100, and the other modified photocatalysts were synthesised by our group using solegel and solegel hydrothermal processes (SG400, SG750 and HT). Pt weight percentages used in the study were 0.5, 1.0 and 2.1 wt.% (Pt/TiO 2). The photocatalysts were extensively characterised by X-ray diffraction (XRD), UVevis diffuse reflectance, BrunauereEmmetteTeller (BET) surface area measurement, transmission electron microscopy (TEM), scanning electron microscopy (SEMeEDX), Fourier transform infrared spectroscopy (FTIR) and laser light dispersion. Methanol (25% vol.) was used as sacrificial agent over the 8 h of the hydrogen production tests and measurements were taken of the final concentrations of formaldehyde and formic acid as well as initial and final TOC. Photoactivity of all photocatalysts increased in the presence of Pt. The most efficient of the synthesised photocatalysts was SG750 and of the commercial photocatalysts P25. Maximum production of SG750 was 1846 mmol h À1 at 1.0 wt.% Pt and its production per surface unit was notably higher than that of P25.
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