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Size-Dependent Visible Light Photocatalytic Performance of Cu2O Nanocubes

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JournalChemCatChem
DateAccepted/In press - 15 Jun 2018
DateE-pub ahead of print - 15 Jun 2018
DatePublished (current) - 21 Aug 2018
Issue number16
Volume10
Number of pages10
Pages (from-to)3554-3563
Early online date15/06/18
Original languageEnglish

Abstract

Well-defined Cu2O nanocubes with tunable dimensions and physicochemical properties have been prepared using a simple one-pot reaction. Reduction of Cu(II) salts by ascorbic acid in the presence of PEG as a structure-directing agent affords crystalline Cu2O nanocubes of between 50 to 500nm. Optical band gap, band energies, charge-carrier lifetimes and surface oxidation state systematically evolve with nanocube size, and correlate well with visible light photocatalytic activity for aqueous phase phenol degradation and H2 production which are both directly proportional to size (doubling between 50 and 500nm). HPLC reveals fumaric acid as the primary organic product of phenol degradation, and selectivity increases with nanocube size at the expense of toxic catechol. Apparent quantum efficiencies reach 26% for phenol photodegradation and 1.2% for H2 production using 500nm Cu2O cubes.

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© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

    Research areas

  • CuO, Hydrogen, Nanocubes, Phenol, Photocatalysis

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