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  Reversible amorphization and the catalytically active state of crystalline Co3O4 during oxygen evolution

Bergmann, A., Martinez-Moreno, E., Teschner, D., Chernev, P., Gliech, M., de Araújo, J. F., et al. (2015). Reversible amorphization and the catalytically active state of crystalline Co3O4 during oxygen evolution. Nature Communications, 6(10): 8625. doi:10.1038/ncomms9625.

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Bergmann, Arno1, Autor
Martinez-Moreno, Elias2, Autor
Teschner, Detre3, Autor           
Chernev, Petko2, Autor
Gliech, Manuel1, Autor
de Araújo, Jorge Ferreira1, Autor
Reier, Tobias1, Autor
Dau, Holger2, Autor
Strasser, Peter1, 4, Autor
Affiliations:
1Department of Chemistry, Chemical and Materials Engineering Division, Electrochemical Energy, Catalysis and Materials Science Laboratory, Technische Universität Berlin,, Straße des 17. Juni 124, 10623 Berlin, Germany, ou_persistent22              
2Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany, ou_persistent22              
3Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
4Ertl Center for Electrochemistry and Catalysis, Gwangju Institute of Science and Technology, Gwangju 500-712, South Korea, ou_persistent22              

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 Zusammenfassung: Water splitting catalysed by earth-abundant materials is pivotal for global-scale production of non-fossil fuels, yet our understanding of the active catalyst structure and reactivity is still insufficient. Here we report on the structurally reversible evolution of crystalline Co<sub>3</sub>O<sub>4</sub> electrocatalysts during oxygen evolution reaction identified using advanced in situ X-ray techniques. At electrode potentials facilitating oxygen evolution, a sub-nanometre shell of the Co<sub>3</sub>O<sub>4</sub> is transformed into an X-ray amorphous CoO<sub>x</sub>(OH)<sub>y</sub> which comprises di-μ-oxo-bridged Co<sup>3+/4+</sup ions. Unlike irreversible amorphizations, here, the formation of the catalytically-active layer is reversed by re-crystallization upon return to non-catalytic electrode conditions. The Co<sub>3</sub>O<sub>4</sub> material thus combines the stability advantages of a controlled, stable crystalline material with high catalytic activity, thanks to the structural flexibility of its active amorphous oxides. We propose that crystalline oxides may be tailored for generating reactive amorphous surface layers at catalytic potentials, just to return to their stable crystalline state under rest conditions.

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Sprache(n): eng - English
 Datum: 2015-06-192015-09-122015-10-12
 Publikationsstatus: Online veröffentlicht
 Seiten: 9
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1038/ncomms9625
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Titel: Nature Communications
  Kurztitel : Nat. Commun.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: London : Nature Publishing Group
Seiten: - Band / Heft: 6 (10) Artikelnummer: 8625 Start- / Endseite: - Identifikator: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723