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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: 3554 (2020). doi:10.1038/s41467- 020-17346-7.

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 Creators:
Cao, Jing1, Author              
Rinaldi, Ali2, Author
Plodinec, Milivoj1, Author              
Huang, Xing1, 3, Author              
Willinger, Elena1, 3, Author              
Hammud, Adnan1, Author              
Hieke, Stefan4, Author
Beeg, Sebastian5, Author
Gregoratti, Luca6, Author
Colbea, Claudiu3, Author
Schlögl, Robert1, 5, Author              
Antonietti, Markus7, Author
Greiner, Mark5, Author
Willinger, Marc Georg1, 3, 7, Author              
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
2Chemistry Department, King FahdUniversity of Petroleum & Minerals, 31261 Dhahran, Saudi Arabia, ou_persistent22              
3Scientific Center for Optical and Electron Microscopy, ScopeMETH Zürich, 8093 Zürich, Switzerland, ou_persistent22              
4Max-Planck-Institut für Eisenforschung GmbH, 40237 Düsseldorf, Germany, ou_persistent22              
5Max Planck Institute for Chemical Energy Conversion, 45470 Mülheim an der Ruhr, Germany, ou_persistent22              
6Elettra-Sincrotrone Trieste S.C.p.A, 34149 Basovizza, Trieste, Italy, ou_persistent22              
7Max-Planck-Institute of Colloids andInterfaces, Department of Colloid Chemistry, 14424 Potsdam, Germany, ou_persistent22              

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 Abstract: How a catalyst behaves microscopically under reaction conditions, and what kinds of activesites 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 ofhydrogen oxidation. Direct imaging combined with on-line mass spectroscopy shows thatactivity emerges near a phase boundary, where complex spatio-temporal dynamics areinduced 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 andscanning photoemission microscopy, we reveal the relation between chemical and mor-phological dynamics and demonstrate that a static picture of active sites is insufficient todescribe catalytic function of redox-active metal catalysts. The observed oscillatory redoxdynamics provide a unique insight on phase-cooperation and a convenient and generalmechanism for constant re-generation of transient active sites.

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Language(s): eng - English
 Dates: 2020-03-132020-06-232020-07-16
 Publication Status: Published online
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 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: 11 Volume / Issue: 11 Sequence Number: 3554 (2020) Start / End Page: - Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723