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Photocatalytic hydrogen production from aqueous methanol solution using Pt nanocatalysts supported on mesoporous TiO2 hollow shells

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Abstract

Mesoporous TiO2 hollow shells were synthesized by a conventional templating method which combines sol–gel coating and selective etching of the silica cores. Pt nanocatalysts were supported on these mesoporous TiO2 hollow shells varying the metal loading: 0, 1, 3, 5 and 7 % at calcination temperatures of 500 or 900 °C. The samples were characterized by transmission electron microscopy, X-ray diffraction, UV–Vis diffuse reflectance spectroscopy, and nitrogen physisorption. The mesostructures were observed by TEM and HRTEM to be smaller than 300 nm and the TiO2 shells had an average wall thickness of 40 nm. X-ray diffraction spectra revealed a pure anatase phase in samples calcined at 900 °C, whereas those calcined at 500 °C were amorphous. Under white light (UV and Visible) illumination, photocatalytic hydrogen production was measured from the samples suspended in an aqueous solution of methanol and compared to TiO2 (P25, Degussa) used as a reference. The highest hydrogen yields were achieved with the crystalline TiO2 hollow shells annealed at 900 °C containing 1 or 7 wt% Pt. The amorphous samples were observed to be inactive, at all metal loadings.

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Acknowledgments

The authors acknowledge the financial supports of Consejo Nacional de Ciencia y Tecnología 166354, 251151, 153356, SIP 20150030 and SIP 20150621. FPH is grateful for Consejo Nacional de Ciencia y Tecnología and BEIFI fellowships. We thank to Luis Rendón (TEM and HRTEM), Marcela Guerrero Cruz (XRD) and Mario García (SEM/EDS) for technical assistance.

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Authors and Affiliations

  1. Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada Unidad Legaria, Instituto Politécnico Nacional, Legaria 694, Colonia Irrigación, Miguel Hidalgo, 11500, Mexico, D.F., Mexico

    F. Plascencia-Hernández & G. Valverde-Aguilar

  2. Department of Chemical Engineering, University of California, Santa Barbara, CA, 93106-5080, USA

    N. Singh, A. R. Derk & E. W. McFarland

  3. Department of Chemistry, University of California, Riverside, CA, 92521, USA

    F. Zaera

  4. Centro de Nanociencias y Micro y Nanotecnologías, Instituto Politécnico Nacional, Zacatenco, 07738, Mexico, D.F., Mexico

    N. Cayetano-Castro

  5. Escuela Superior de Cómputo, Instituto Politécnico Nacional, Zacatenco, 07738, Mexico, D.F., Mexico

    R. Vázquez-Arreguín

  6. Lab. Catálisis y Materiales, ESIQIE- Instituto Politécnico Nacional, Zacatenco, 07738, Mexico, D.F., Mexico

    Miguel A. Valenzuela

Authors
  1. F. Plascencia-Hernández
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  2. G. Valverde-Aguilar
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  3. N. Singh
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  4. A. R. Derk
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  5. E. W. McFarland
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  6. F. Zaera
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  7. N. Cayetano-Castro
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  8. R. Vázquez-Arreguín
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  9. Miguel A. Valenzuela
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Correspondence to F. Plascencia-Hernández.

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Plascencia-Hernández, F., Valverde-Aguilar, G., Singh, N. et al. Photocatalytic hydrogen production from aqueous methanol solution using Pt nanocatalysts supported on mesoporous TiO2 hollow shells. J Sol-Gel Sci Technol 77, 39–47 (2016). https://doi.org/10.1007/s10971-015-3826-x

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  • DOI: https://doi.org/10.1007/s10971-015-3826-x

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