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Catalysts 2017, 7(11), 324; doi:10.3390/catal7110324

Hydrogen Production via Water Dissociation Using Pt–TiO2 Photocatalysts: An Oxidation–Reduction Network

1
Faculty of Engineering, Chemical Reactor Engineering Centre (CREC), Western University, London, ON N6A 5B9, Canada
2
Unidad de Ciencias Químicas, Autonomous University of Zacatecas, Zacatecas, Zac 98000, México
*
Author to whom correspondence should be addressed.
Received: 18 September 2017 / Revised: 18 October 2017 / Accepted: 18 October 2017 / Published: 30 October 2017
(This article belongs to the Special Issue Photocatalytic Water Splitting)
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Abstract

Several TiO2 based semiconductors with different Pt loadings are prepared using incipient impregnation, wet impregnation and the sol-gel method. These photocatalysts are evaluated in the Photo-CREC-Water II Photoreactor for hydrogen production via water dissociation, using an organic renewable scavenger (ethanol). Results obtained show the influence of the photocatalyst preparation in the production of hydrogen and in the observed quantum yields. Furthermore, it is established that the reaction networks leading to hydrogen production, using various photocatalysts, share common features. This analysis is developed by both identifying and quantifying different chemical species and their changes with irradiation time. Key species in this oxidation–reduction network are hydrogen, hydrogen peroxide, ethanol, methane, ethane, acetaldehyde and carbon dioxide. On this basis, it is shown that under an inert gas atmosphere, ethanol consumption is sub-stoichiometric. This points towards simultaneous ethanol consumption and the formation of the ethanol scavenger. View Full-Text
Keywords: photocatalysis; titanium dioxide; platinum; hydrogen; water and electron scavenger photocatalysis; titanium dioxide; platinum; hydrogen; water and electron scavenger
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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

Guayaquil-Sosa, J.F.; Calzada, A.; Serrano, B.; Escobedo, S.; de Lasa, H. Hydrogen Production via Water Dissociation Using Pt–TiO2 Photocatalysts: An Oxidation–Reduction Network. Catalysts 2017, 7, 324.

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