Water Stable Zr–Benzenedicarboxylate Metal–Organic Frameworks as Photocatalysts for Hydrogen Generation |
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Authors: | Dr Cláudia Gomes?Silva Ignacio Luz Dr Francesc X Llabrés?i?Xamena Prof?Dr Avelino Corma Prof?Dr Hermenegildo García |
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Institution: | 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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Keywords: | hydrogen metal– organic frameworks photocatalysts zirconium |
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