In situ observation of oscillatory redox dynamics of copper.
- Cao J Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195, Berlin, Germany.
- Rinaldi A Chemistry Department, King Fahd University of Petroleum & Minerals, 31261, Dhahran, Saudi Arabia.
- Plodinec M Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195, Berlin, Germany.
- Huang X Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195, Berlin, Germany.
- Willinger E Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195, Berlin, Germany.
- Hammud A Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195, Berlin, Germany.
- Hieke S Max-Planck-Institut für Eisenforschung GmbH, 40237, Düsseldorf, Germany.
- Beeg S Max Planck Institute for Chemical Energy Conversion, 45470, Mülheim an der Ruhr, Germany.
- Gregoratti L Elettra-Sincrotrone Trieste S.C.p.A, 34149, Basovizza, Trieste, Italy.
- Colbea C Scientific Center for Optical and Electron Microscopy, ScopeMETH Zürich, 8093, Zürich, Switzerland.
- Schlögl R Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195, Berlin, Germany.
- Antonietti M Max-Planck-Institute of Colloids and Interfaces, Department of Colloid Chemistry, 14424, Potsdam, Germany.
- Greiner M Max Planck Institute for Chemical Energy Conversion, 45470, Mülheim an der Ruhr, Germany. mark.greiner@cec.mpg.de.
- Willinger M Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195, Berlin, Germany. willmarc@ethz.ch.
- 2020-07-18
Published in:
- Nature communications. - 2020
General Biochemistry, Genetics and Molecular Biology
General Physics and Astronomy
General Chemistry
English
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.
- Language
-
- English
- Open access status
- gold
- Identifiers
-
- DOI 10.1038/s41467-020-17346-7
- PMID 32678088
- Persistent URL
- https://sonar.ch/global/documents/185642
Statistics
Document views: 35
File downloads:
- Full-text: 0