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Hydrogen Photoproduction from Ethanol–Water Mixtures Over Au–Cu Alloy Nanoparticles Supported on TiO2

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Abstract

Au/TiO2, Au0.75Cu0.25/TiO2, Au0.5Cu0.5/TiO2 and Au0.25Cu0.75/TiO2 photocatalysts prepared from pre-formed Au and Au–Cu alloy nanoparticles of controlled composition and size were loaded over ceramic honeycombs (2 mg cm−2) and tested in an optical fiber photoreactor illuminated with UV LEDs (2.6 mW cm−2) to continuously produce hydrogen from water and ethanol mixtures in gas phase at W/F = 4 g min L−1 and 298 K (where W is the weight of the catalyst and F is the flow rate). The photocatalytic honeycombs were characterized by high resolution transmission electron microscopy, high-angle annular dark-field imaging, energy dispersive X-ray, X-ray photoelectron spectroscopy, and UV–Vis spectroscopy. The yield of hydrogen generation was Au0.75Cu0.25/TiO2 > Au0.5Cu0.5/TiO2 ~ Au/TiO2 > Au0.25Cu0.75/TiO2 ≫ bare TiO2, thus demonstrating that the addition of small quantities of copper to conventional TiO2-supported gold photocatalysts promotes the photocatalyic activity, likely by providing effective charge transfer between Au and Cu in the alloy nanoparticles.

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Acknowledgments

This work has been funded through Grant MINECO ENE2012-36368. J.L. is Serra Húnter Fellow and is grateful to the ICREA Academia program.

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Authors and Affiliations

  1. Institut de Tècniques Energètiques and Centre for Research in NanoEngineering, Universitat Politècnica de Catalunya, Av. Diagonal 647, Ed. ETSEIB, 08028, Barcelona, Spain

    Eduard Bonmatí, Albert Casanovas & Jordi Llorca

  2. Departament de Química Inorgànica, Universitat de Barcelona, Martí i Franquès 1, 08028, Barcelona, Spain

    Inma Angurell

Authors
  1. Eduard Bonmatí
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  2. Albert Casanovas
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  3. Inma Angurell
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  4. Jordi Llorca
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Correspondence to Jordi Llorca.

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Bonmatí, E., Casanovas, A., Angurell, I. et al. Hydrogen Photoproduction from Ethanol–Water Mixtures Over Au–Cu Alloy Nanoparticles Supported on TiO2 . Top Catal 58, 77–84 (2015). https://doi.org/10.1007/s11244-014-0347-8

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  • DOI: https://doi.org/10.1007/s11244-014-0347-8

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