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  Compositional decoupling of bulk and surface in open-structured complex mixed oxides

Masliuk, L., Schmidt, F.-P., Hetaba, W., Plodinec, M., Auffermann, G., Hermann, K., et al. (2020). Compositional decoupling of bulk and surface in open-structured complex mixed oxides. The Journal of Physical Chemistry C, 124, 23069-23077. doi:10.1021/acs.jpcc.0c04777.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-5E64-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-5E66-E
Genre: Journal Article

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 Creators:
Masliuk, Liudmyla1, Author
Schmidt, Franz-Philipp1, Author
Hetaba, Walid1, Author
Plodinec, Milivoj1, Author
Auffermann, Gudrun2, Author              
Hermann, Klaus1, Author
Teschner, Detre1, Author
Girgsdies, Frank1, Author
Trunschke, Annette1, Author
Schlögl, Robert1, Author
Lunkenbein, Thomas1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Gudrun Auffermann, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863432              

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Free keywords: Electron energy levels; Electron scattering; Energy dissipation; High resolution transmission electron microscopy; Molybdenum metallography; Physicochemical properties; Scanning electron microscopy, Compositional gradients; Compositional variation; Heterogeneous catalyst; Integral techniques; Lateral surface; Local compositions; Scanning transmission electron microscopy; Surface reactivity, Electron energy loss spectroscopy
 Abstract: The local composition of heterogeneous catalysts can deviate from average values obtained by integral techniques. However, due to the difficulties in capturing nontranslational parts, they are often not determined. We have examined local alterations in the metal cation distribution of open-structured orthorhombic (Mo,V)Ox by scanning transmission electron microscopy coupled to electron energy loss spectroscopy (STEM-EELS). A HyperSpy-based routine was adapted and implemented that allows for automated EELS analysis. This analysis revealed compositional variations that reflect differences among the bulk, termination layers, and different surface facets. For instance, the lateral surface is preferentially enriched in molybdenum compared to the bulk, while V-rich surfaces can also be detected for the basal plane. These compositional inhomogeneities can modulate the surface reactivity on the atomic scale. The knowledge of local compositional gradients is of general importance for any material as they alter its local chemistry and, thus, its physicochemical properties. Furthermore, such knowledge allows establishing novel composition-activity correlations, which could provide a deeper understanding of the origin of the function of materials. © 2020 American Chemical Society. All rights reserved.

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Language(s): eng - English
 Dates: 2020-10-132020-10-13
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1021/acs.jpcc.0c04777
 Degree: -

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Title: The Journal of Physical Chemistry C
  Abbreviation : J. Phys. Chem. C
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: - Volume / Issue: 124 Sequence Number: - Start / End Page: 23069 - 23077 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766