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

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Pizzutilo E, Knossalla J, Geiger S, Grote JP, Polymeros G, Baldizzone C, Mezzavilla S, Ledendecker M, Mingers A, Cherevko S, Schueth F, Mayrhofer K
Zeitschrift: Advanced Energy Materials
Verlag: WILEY-V C H VERLAG GMBH
Jahr der Veröffentlichung: 2017
Band: 7
Heftnummer: 20
ISSN: 1614-6832
eISSN: 1614-6840


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.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Mayrhofer, Karl Prof. Dr.
Lehrstuhl für Elektrokatalyse (HIERN)


Einrichtungen weiterer Autorinnen und Autoren

Max-Planck-Institut für Eisenforschung GmbH (MPIE) / Max Planck Institute for Iron Research
Max-Planck-Institut für Kohlenforschung (MPI KoFo) / Max Planck Institute for Coal Research


Zitierweisen

APA:
Pizzutilo, E., Knossalla, J., Geiger, S., Grote, J.-P., Polymeros, G., Baldizzone, C.,... Mayrhofer, K. (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). https://dx.doi.org/10.1002/aenm.201700835

MLA:
Pizzutilo, Enrico, et al. "The Space Confinement Approach Using Hollow Graphitic Spheres to Unveil Activity and Stability of Pt-Co Nanocatalysts for PEMFC." Advanced Energy Materials 7.20 (2017).

BibTeX: 

Zuletzt aktualisiert 2019-13-08 um 12:08