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Water Stable Zr–Benzenedicarboxylate Metal–Organic Frameworks as Photocatalysts for Hydrogen Generation

Authors

  • Dr. Cláudia Gomes Silva,

    1. Instituto de Tecnología Química, CSIC-UPV, Universidad Politécnica de Valencia, Consejo Superior de Investigaciones Científicas, Av. de los Naranjos s/n, 46022 Valencia (Spain)
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  • Ignacio Luz,

    1. Instituto de Tecnología Química, CSIC-UPV, Universidad Politécnica de Valencia, Consejo Superior de Investigaciones Científicas, Av. de los Naranjos s/n, 46022 Valencia (Spain)
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  • Dr. Francesc X. Llabrés i Xamena,

    1. Instituto de Tecnología Química, CSIC-UPV, Universidad Politécnica de Valencia, Consejo Superior de Investigaciones Científicas, Av. de los Naranjos s/n, 46022 Valencia (Spain)
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  • Prof. Dr. Avelino Corma,

    1. Instituto de Tecnología Química, CSIC-UPV, Universidad Politécnica de Valencia, Consejo Superior de Investigaciones Científicas, Av. de los Naranjos s/n, 46022 Valencia (Spain)
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  • Prof. Dr. Hermenegildo García

    1. Instituto de Tecnología Química, CSIC-UPV, Universidad Politécnica de Valencia, Consejo Superior de Investigaciones Científicas, Av. de los Naranjos s/n, 46022 Valencia (Spain)
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Abstract

The Zr-containing metal–organic frameworks (MOFs) formed by terephthalate (UiO-66) and 2-aminoterephthalate ligands [UiO-66(NH2)] are two notably water-resistant MOFs that exhibit photocatalytic activity for hydrogen generation in methanol or water/methanol upon irradiation at wavelength longer than 300 nm. The apparent quantum yield for H2 generation using monochromatic light at 370 nm in water/methanol 3:1 was of 3.5 % for UiO-66(NH2). Laser-flash photolysis has allowed detecting for UiO-66 and UiO-66(NH2) the photochemical generation of a long lived charge separated state whose decay is not complete 300 μs after the laser flash. Our finding and particularly the influence of the amino group producing a bathochromic shift in the optical spectrum without altering the photochemistry shows promises for the development of more efficient MOFs for water splitting.

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