Carboxylic acid induced near-surface restructuring of a magnetite surface

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Erscheinungsjahr:
2019
Medientyp:
Text
Beschreibung:
  • A fundamental knowledge of the interaction of carboxylic acids, such as formic acid, withmagnetite surfaces is of prime importance for heterogeneous catalysis and the synthesis ofnovel materials. Despite this, little is known about the atomic scale adsorption mechanisms.Here we show by in-situ surface X-ray diffraction that the oxygen rich subsurface cationvacancy reconstruction of the clean magnetite (001) surface is lifted by dissociative formicacid adsorption, reestablishing a surface with bulk stoichiometry. Using density functionaltheory, the bulk terminated, fully formic acid covered surface is calculated to be more stablethan the corresponding clean, reconstructed surface. A comparison of calculated andexperimental infrared bands supports the bidentate adsorption geometry and a specificadsorption site. Our results pave the way for a fundamental understanding of the bondingmechanism at carboxylic acid/oxide interfaces.
Lizenz:
  • info:eu-repo/semantics/openAccess
Quellsystem:
Forschungsinformationssystem der UHH

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oai:www.edit.fis.uni-hamburg.de:publications/2609a62d-b1f5-4a51-b1c2-1a4de338fc80