High temperature stability study of carbon supported high surface area catalysts-Expanding the boundaries of ex-situ diagnostics
Polymeros G, Baldizzone C, Geiger S, Grote JP, Knossalla J, Mezzavilla S, Keeley GP, Cherevko S, Zeradjanin AR, Schueth F, Mayrhofer K (2016)
Publication Status: Published
Publication Type: Journal article
Publication year: 2016
Journal
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Book Volume: 211
Pages Range: 744-753
DOI: 10.1016/j.electacta.2016.06.105
Abstract
The performance of proton-exchange membrane fuel cells (PEMFCs) is defined by the equally important parameters of the intrinsic activity and stability of the electrocatalysts. This work focuses on the stability of carbon supported high surface area oxygen reduction reaction catalysts at potentials and temperatures similar to the operating conditions of PEMFCs. The catalysts used for this investigation consist of Pt nanoparticles of the same particle size supported on two types of carbon support having different textural properties, i.e., Vulcan and Hollow Graphitic Spheres (HGS). A broad toolbox of characterization techniques is utilized at 60 degrees C in order to resolve the contribution of the different degradation mechanisms, namely nanoparticle coalescence, metal dissolution and the corrosion of carbon support, to the total active surface area loss. The results obtained by investigating the impact of temperature, potential treatment and catalyst layer morphology on the aging behavior lead to a deeper understanding of the aging mechanisms and their interrelation at application-relevant conditions. Moreover, the previously reported improved performance of the Pt/HGS catalyst is confirmed also under higher temperatures. The experimental approach introduced in this work, highlights new challenges for high-temperature degradation investigations with supported PEMFC catalyst. (C) 2016 Elsevier Ltd. All rights reserved.
Authors with CRIS profile
Involved external institutions
Max-Planck-Institut für Eisenforschung GmbH (MPIE) / Max Planck Institute for Iron Research
Germany (DE)
Max-Planck-Institut für Kohlenforschung (MPI KoFo) / Max Planck Institute for Coal Research
Germany (DE)
Germany (DE)
Max-Planck-Institut für Kohlenforschung (MPI KoFo) / Max Planck Institute for Coal Research
Germany (DE)
How to cite
APA:
Polymeros, G., Baldizzone, C., Geiger, S., Grote, J.P., Knossalla, J., Mezzavilla, S.,... Mayrhofer, K. (2016). High temperature stability study of carbon supported high surface area catalysts-Expanding the boundaries of ex-situ diagnostics. Electrochimica Acta, 211, 744-753. https://doi.org/10.1016/j.electacta.2016.06.105
MLA:
Polymeros, G., et al. "High temperature stability study of carbon supported high surface area catalysts-Expanding the boundaries of ex-situ diagnostics." Electrochimica Acta 211 (2016): 744-753.
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