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  Unravelling Degradation Pathways of Oxide-Supported Pt Fuel Cell Nanocatalysts under In Situ Operating Conditions

Schmies, H., Bergmann, A., Drnec, J., Wang, G., Teschner, D., Kühl, S., et al. (2017). Unravelling Degradation Pathways of Oxide-Supported Pt Fuel Cell Nanocatalysts under In Situ Operating Conditions. Advanced Energy Materials, 1701663. doi:10.1002/aenm.201701663.

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 Creators:
Schmies, Henrike1, Author
Bergmann, Arno1, Author
Drnec, Jakub2, Author
Wang, Guanxiong3, Author
Teschner, Detre4, 5, Author           
Kühl, Stefanie1, Author
Sandbeck, Daniel J. S.6, Author
Cherevko, Serhiy6, Author
Gocyla, Martin7, Author
Shviro, Meital7, Author
Heggen, Marc7, Author
Ramani, Vijay3, Author
Dunin-Borkowski, Rafal E.7, Author
Mayrhofer, Karl J. J.6, Author
Strasser, Peter1, Author
Affiliations:
1Department of Chemistry Chemical Engineering Division Technical University of Berlin , 10623 Berlin, Germany, ou_persistent22              
2European Synchrotron Radiation Facility (ESRF), 38000 Grenoble, France, ou_persistent22              
3School of Engineering & Applied Science Washington University in St. Louis, 63130 St. Louis, MO, USA, ou_persistent22              
4Department of Heterogeneous Reactions Max-Planck-Institute for Chemical Energy Conversion , 45470 Mühlheim an der Ruhr, ou_persistent22              
5Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
6Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11) Forschungszentrum Jülich, 91058 Erlangen, Germany, ou_persistent22              
7Ernst-Ruska Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich, 52425 Jülich, Germany, ou_persistent22              

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 Abstract: Knowledge of degradation pathways of catalyst/support ensembles aids the development of rational strategies to improve their stability. Here, this is exemplified using indium tin oxide (ITO)-supported Platinum nanoparticles as electrocatalysts at fuel cell (FC) cathodes under degradation protocols to mimic operating conditions in two potential regimes. The evolution of crystal structure, composition, crystallite and particle size is tracked by in situ X-ray techniques (small and wide angle scattering), metal dissolution by in situ scanning flow cell coupled with mass spectrometry (SFC ICP-MS) and Pt surface morphology by advanced electron microscopy. In a regular FC operation regime, Pt poisoning rather than Pt particle growth, agglomeration, dissolution or detachment was found to be the likely origin of the observed degradation and ORR activity losses. In the start-up regime degradation is actually suppressed and only minor losses in catalytic activity are observed. The presented data thus highlight the excellent nanoparticle stabilization and corrosion resistance of the ITO support, yet point to a degradation pathway involving Pt surface modifications by deposition of sub-monolayers of support metal ions. The identified degradation pathway of the Pt/oxide catalyst/support couple contributes to our understanding of cathode electrocatalysts for polymer electrolyte fuel cells (PEFC).

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Language(s): eng - English
 Dates: 2017-08-042017-06-172017-09-25
 Publication Status: Published online
 Pages: 13
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/aenm.201701663
 Degree: -

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Title: Advanced Energy Materials
  Abbreviation : Adv. Energy Mater.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: 13 Volume / Issue: - Sequence Number: 1701663 Start / End Page: - Identifier: Other: 1614-6832
CoNE: https://pure.mpg.de/cone/journals/resource/1614-6832