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  The Space Confinement Approach Using Hollow Graphitic Spheres to Unveil Activity and Stability of Pt-Co Nanocatalysts for PEMFC

Pizzutilo, E., Knossalla, J., Geiger, S., Grote, J.-P., Polymeros, G., Baldizzone, C., et al. (2017). The Space Confinement Approach Using Hollow Graphitic Spheres to Unveil Activity and Stability of Pt-Co Nanocatalysts for PEMFC. Advanced Energy Materials, 7(20): 1700835. doi:10.1002/aenm.201700835.

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 Creators:
Pizzutilo, Enrico1, Author
Knossalla, Johannes2, Author           
Geiger, Simon1, Author
Grote, Jan-Philipp1, Author
Polymeros, George1, Author
Baldizzone, Claudio1, Author
Mezzavilla, Stefano1, Author
Ledendecker, Marc1, Author
Mingers, Andrea1, Author
Cherevko, Serhiy1, 3, Author
Schüth, Ferdi2, Author           
Mayrhofer, Karl J. J.1, 3, 4, Author
Affiliations:
1Department of Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany, ou_persistent22              
2Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
3Forschungszentrum Jülich GmbH, Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Erlangen, Germany, ou_persistent22              
4Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany, ou_persistent22              

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Free keywords: activity, degradation, hollow graphitic spheres, ORR, PEMFC
 Abstract: The performance of polymer electrolyte fuel cells is strongly correlated to the electrocatalytic activity and stability. In particular, the latter is the result of an interplay between different degradation mechanisms. The essential high stability, demanded for real applications, requires the synthesis of advanced electrocatalysts that withstand the harsh operation conditions. In the first part of this study, the synthesis of oxygen reduction electrocatalysts consisting of Pt-Co (i.e., Pt5Co, Pt3Co, and PtCo) alloyed nanoparticles encapsulated in the mesoporous shell of hollow graphitic spheres (HGS) is reported. The mass activities of the activated catalysts depend on the initial alloy composition and an activity increase on the order of two to threefold, compared to pure Pt@HGS, is achieved. The key point of the second part is the investigation of the degradation of PtCo@HGS (showing the highest activity). Thanks to pore confinement, the impact of dissolution/dealloying and carbon corrosion can be studied without the interplay of other degradation mechanisms that would induce a substantial change in the particle size distribution. Therefore, impact of the upper potential limit and the scan rates on the dealloying and electrochemical surface area evolution can be examined in detail.

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Language(s): eng - English
 Dates: 2017-07-142017-10-25
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/aenm.201700835
 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: - Volume / Issue: 7 (20) Sequence Number: 1700835 Start / End Page: - Identifier: Other: 1614-6832
CoNE: https://pure.mpg.de/cone/journals/resource/1614-6832