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  In situ observation of oscillatory redox dynamics of copper

Cao, J., Rinaldi, A., Plodinec, M., Huang, X., Willinger, E., Hammud, A., et al. (2020). In situ observation of oscillatory redox dynamics of copper. Nature Communications, 11(1): 3554. doi:10.1038/s41467-020-17346-7.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-C5FC-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-C5FD-F
Genre: Journal Article

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 Creators:
Cao, Jing, Author
Rinaldi, Ali, Author
Plodinec, Milivoj, Author
Huang, Xing, Author
Willinger, Elena, Author
Hammud, Adnan, Author
Hieke, Stefan, Author
Beeg, Sebastian, Author
Gregoratti, Luca, Author
Colbea, Claudiu, Author
Schlögl, Robert, Author
Antonietti, Markus1, Author              
Greiner, Mark, Author
Willinger, Marc Georg2, Author              
Affiliations:
1Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863321              
2Marc Willinger, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2364728              

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Free keywords: Catalytic mechanisms; Heterogeneous catalysis; Reaction kinetics and dynamics
 Abstract: How a catalyst behaves microscopically under reaction conditions, and what kinds of active sites transiently exist on its surface, is still very much a mystery to the scientific community. Here we present an in situ study on the red-ox behaviour of copper in the model reaction of hydrogen oxidation. Direct imaging combined with on-line mass spectroscopy shows that activity emerges near a phase boundary, where complex spatio-temporal dynamics are induced by the competing action of simultaneously present oxidizing and reducing agents. Using a combination of in situ imaging with in situ X-ray absorption spectroscopy and scanning photoemission microscopy, we reveal the relation between chemical and morphological dynamics and demonstrate that a static picture of active sites is insufficient to describe catalytic function of redox-active metal catalysts. The observed oscillatory redox dynamics provide a unique insight on phase-cooperation and a convenient and general mechanism for constant re-generation of transient active sites.

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Language(s): eng - English
 Dates: 2020-07-162020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1038/s41467-020-17346-7
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 11 (1) Sequence Number: 3554 Start / End Page: - Identifier: ISSN: 2041-1723