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  Phase Coexistence and Structural Dynamics of Redox Metal Catalysts Revealed by Operando TEM

Huang, X., Jones, T., Fedorov, A., Farra, R., Copéret, C., Schlögl, R., et al. (2021). Phase Coexistence and Structural Dynamics of Redox Metal Catalysts Revealed by Operando TEM. Advanced Materials, 2101772. doi:10.1002/adma.202101772.

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 Creators:
Huang, Xing1, 2, 3, 4, Author              
Jones, Travis4, Author              
Fedorov, Alexey 5, Author
Farra, Ramzi4, Author              
Copéret, Christophe3, Author
Schlögl, Robert4, 6, Author              
Willinger, Marc Georg1, 4, Author              
Affiliations:
1Scientific Center for Optical and Electron Microscopy, ETH Zurich , Otto-Stern-Weg 3, Zurich, 8093 Switzerland, ou_persistent22              
2College of Chemistry, Fuzhou University , Fuzhou, 350116 P. R. China, ou_persistent22              
3Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1-5, Zurich, 8093 Switzerland, ou_persistent22              
4Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
5Department of Mechanical and Process Engineering, ETH Zurich, Leonhardstrasse 21, 8092 Zurich, Switzerland, ou_persistent22              
6Department Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, 45470 Mülheim an der Ruhr, Germany, ou_persistent22              

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 Abstract: Metal catalysts play an important role in industrial redox reactions. Although extensively studied, the state of these catalysts under operating conditions is largely unknown, and assignments of active sites remain speculative. Herein, an operando transmission electron microscopy study is presented, which interrelates the structural dynamics of redox metal catalysts to their activity. Using hydrogen oxidation on copper as an elementary redox reaction, it is revealed how the interaction between metal and the surrounding gas phase induces complex structural transformations and drives the system from a thermodynamic equilibrium toward a state controlled by the chemical dynamics. Direct imaging combined with the simultaneous detection of catalytic activity provides unparalleled structure–activity insights that identify distinct mechanisms for water formation and reveal the means by which the system self-adjusts to changes of the gas-phase chemical potential. Density functional theory calculations show that surface phase transitions are driven by chemical dynamics even when the system is far from a thermodynamic phase boundary. In a bottom-up approach, the dynamic behavior observed here for an elementary reaction is finally extended to more relevant redox reactions and other metal catalysts, which underlines the importance of chemical dynamics for the formation and constant re-generation of transient active sites during catalysis.

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Language(s): eng - English
 Dates: 2021-03-052021-06-12
 Publication Status: Published online
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/adma.202101772
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Title: Advanced Materials
  Other : Adv. Mater.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: 11 Volume / Issue: - Sequence Number: 2101772 Start / End Page: - Identifier: ISSN: 0935-9648
CoNE: https://pure.mpg.de/cone/journals/resource/954925570855