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Zeitschrift für Naturforschung B

A Journal of Chemical Sciences

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1865-7117
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The role of synthesis conditions for structural defects and lattice strain in β-TaON and their effect on photo- and photoelectrocatalysis

Martin Rohloff
  • Freiburger Zentrum für interaktive Werkstoffe und bioinspirierte Technologien (FIT), Georges-Köhler-Allee 105, 79110 Freiburg, Germany
  • Institut für anorganische und analytische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstraße 21, 79104 Freiburg, Germany
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/ Sevilay Cosgun
  • Institut für Chemie, Technische Universität Berlin, Straße des 17 Juni 135, 10623 Berlin, Germany
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/ Cyriac Massué
  • Fritz-Haber-Institut Berlin, Abteilung Anorganische Chemie, Faradayweg 4, 14195 Berlin, Germany
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/ Thomas Lunkenbein
  • Fritz-Haber-Institut Berlin, Abteilung Anorganische Chemie, Faradayweg 4, 14195 Berlin, Germany
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/ Anatoliy Senyshyn
  • Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstraße 1, 85748 Garching bei München, Germany
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/ Martin Lerch
  • Corresponding author
  • Institut für Chemie, Technische Universität Berlin, Straße des 17 Juni 135, 10623 Berlin, Germany, Phone: +49 30 314 22603, Fax: +49 30 314 79656
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/ Anna Fischer
  • Corresponding author
  • Institut für anorganische und analytische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstraße 21, 79104 Freiburg, Germany
  • Freiburger Zentrum für interaktive Werkstoffe und bioinspirierte Technologien (FIT), Georges-Köhler-Allee 105, 79110 Freiburg, Germany, Phone: +49 761 203 8717
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/ Malte Behrens
  • Corresponding author
  • Fakultät für Chemie und Center for Nanointegration Duisburg-Essen (CENIDE), Universität Duisburg-Essen, Carl-Benz-Straße 199, 47057 Duisburg, Germany, Phone: +49 201 183 3684, Fax: +49 201 183 3664
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Published Online: 2018-12-08 | DOI: https://doi.org/10.1515/znb-2018-0171

Abstract

The importance of the synthesis conditions on the structural and photocatalytic properties of tantalum oxide nitride was investigated by comparing two variants of phase-pure β-TaON obtained from application of two different synthesis routes, leading to one unstrained and one heavily anisotropically microstrained β-TaON as shown by XRD-based Rietveld refinement. HRTEM images reveal the origin of the strain to be lattice defects such as stacking faults. The strained β-TaON was found to be the clearly less active semiconductor in photochemical and photoelectrochemical water oxidation. The lattice defects are assumed to act as charge carrier traps hindering the photo-generated holes to be displaced to the reaction sites at the surface.

Keywords: photocatalysis; photoelectrochemistry; structural defects; tantalum oxide nitride; water splitting

Dedicated to: Professor Wolfgang Bensch on the occasion of his 65th birthday.

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About the article

Received: 2018-08-15

Accepted: 2018-10-26

Published Online: 2018-12-08


Citation Information: Zeitschrift für Naturforschung B, 20180171, ISSN (Online) 1865-7117, ISSN (Print) 0932-0776, DOI: https://doi.org/10.1515/znb-2018-0171.

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