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Defect-Induced Raman Scattering in Cu2O Nanostructures and Their Photocatalytic Performance
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.ORCID iD: 0000-0002-0069-8707
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science and Engineering, Solid State Physics.ORCID iD: 0000-0002-9812-7370
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science and Engineering, Solid State Physics. Newcastle Univ, Sch Nat & Environm Sci, Energy Mat Lab, Newcastle Upon Tyne NE1 7RU, England..ORCID iD: 0000-0003-2759-7356
2023 (English)In: ChemElectroChem, E-ISSN 2196-0216, Vol. 10, no 22, article id e202300376Article in journal (Refereed) Published
Abstract [en]

Advanced oxidation processes using photogenerated charges in semiconductors constitute an approach to reduce and oxidize pollutants, with an efficiency that depends on the photo physics and defect chemistry of the photocatalyst. In this study, 2D Cu2O coatings on flat copper metal and on 3D copper nanopillars are created via low-temperature oxidation and compared. The structures are characterized by X-ray diffraction, Raman spectroscopy, and electron microscopy. The thickest surface oxide layers on the 3D structures show outgrowth of high-aspect ratio CuO nano-needles through the Cu2O layer, rationalized through a field-induced copper ion diffusion mechanism. Raman scattering provides details about both the specific copper oxide phase present and the type and extent of defects, with a resolution spanning from hundreds of nanometers to micrometers. We show that defects in Cu2O induce Raman activity in several of its modes that are purely IR-active or optically silent in pristine Cu2O. The experimental results are corroborated by linear response density functional theory (DFT) calculations for full vibrational mode analysis. The Cu-supported 2D copper oxide systems exhibit effective photocatalytic performance at quite low probe pollution concentration (10 mu M), while the 3D nanopillar structures enhance the photocatalytic efficiency by around 30 % compared to their planar counterpart under these conditions.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2023. Vol. 10, no 22, article id e202300376
Keywords [en]
copper oxide, defect-induced Raman scattering, density functional theory, electrodeposition, photocatalysis
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-522488DOI: 10.1002/celc.202300376ISI: 001085621000001OAI: oai:DiVA.org:uu-522488DiVA, id: diva2:1835926
Funder
Swedish Research Council, 2019-00207Swedish Research Council Formas, 2016-00908Swedish Research Council, 2019-05591
Note

De två första författarna delar förstaförfattarskapet.

Available from: 2024-02-07 Created: 2024-02-07 Last updated: 2024-02-07Bibliographically approved

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Valvo, MarioThyr, JakobEdvinsson, Tomas

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