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Materials 2014, 7(12), 7615-7633; doi:10.3390/ma7127615

Photocatalytic H2 Evolution Using Different Commercial TiO2 Catalysts Deposited with Finely Size-Tailored Au Nanoparticles: Critical Dependence on Au Particle Size

1
Research Group of Environmental Chemistry, Institute of Chemistry, University of Szeged, Tisza L. krt. 103., H-6720 Szeged, Hungary
2
Department of Applied and Environmental Chemistry, University of Szeged, Rerrich tér 1., H-6720 Szeged, Hungary
3
Faculty of Physics, Babeș-Bolyai University, M. Kogălniceanu 1, RO-400084 Cluj-Napoca, Romania
*
Author to whom correspondence should be addressed.
Received: 4 August 2014 / Revised: 28 September 2014 / Accepted: 14 November 2014 / Published: 26 November 2014
(This article belongs to the Special Issue Photocatalytic Materials)
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Abstract

One weight percent of differently sized Au nanoparticles were deposited on two commercially available TiO2 photocatalysts: Aeroxide P25 and Kronos Vlp7000. The primary objective was to investigate the influence of the noble metal particle size and the deposition method on the photocatalytic activity. The developed synthesis method involves a simple approach for the preparation of finely-tuned Au particles through variation of the concentration of the stabilizing agent. Au was deposited on the TiO2 surface by photo- or chemical reduction, using trisodium citrate as a size-tailoring agent. The Au-TiO2 composites were synthetized by in situ reduction or by mixing the titania suspension with a previously prepared gold sol. The H2 production activities of the samples were studied in aqueous TiO2 suspensions irradiated with near-UV light in the absence of dissolved O2, with oxalic acid or methanol as the sacrificial agent. The H2 evolution rates proved to be strongly dependent on Au particle size: the highest H2 production rate was achieved when the Au particles measured ~6 nm. View Full-Text
Keywords: TiO2; H2 evolution; Au nanoparticle; size-dependent activity; oxalic acid TiO2; H2 evolution; Au nanoparticle; size-dependent activity; oxalic acid
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kmetykó, Á.; Mogyorósi, K.; Pusztai, P.; Radu, T.; Kónya, Z.; Dombi, A.; Hernádi, K. Photocatalytic H2 Evolution Using Different Commercial TiO2 Catalysts Deposited with Finely Size-Tailored Au Nanoparticles: Critical Dependence on Au Particle Size. Materials 2014, 7, 7615-7633.

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