Affiliation:
1. Department of Heterogeneous Catalysis Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
2. Analytical Chemistry—Center for Electrochemical Sciences (CES); Faculty of Chemistry and Biochemistry Ruhr University Bochum Universitätsstr. 150 44780 Bochum Germany
3. Department of Heterogeneous Reactions Max-Planck-Institute for Chemical Energy Conversion Stiftstraße 34–36 45470 Mülheim an der Ruhr Germany
Abstract
AbstractIncreasing the resistance of catalysts against electrochemical degradation is one of the key requirements for the wider use of Proton Exchange Membrane Fuel Cells (PEMFCs). Here, we study the degradation of one entity of a highly stable catalyst, Pt@HGS, on a nanoelectrode under accelerated mass transport conditions. We find that the catalyst degrades more rapidly than expected based on previous ensemble measurements. Corroborated by identical location transmission electron microscopy and catalyst layer experiments, we deduce that locally different pH values are likely the reason for this difference in stability. Ultimately, this work provides insights into the actual conditions present in a PEMFC and raises questions about the applicability of accelerated stress tests usually performed to evaluate catalyst stability, particularly when they are performed in half‐cell setups under inert gas.
Funder
Bundesministerium für Wirtschaft und Klimaschutz
Deutsche Forschungsgemeinschaft
Bundesministerium für Bildung und Forschung
Ministerium für Innovation, Wissenschaft und Forschung des Landes Nordrhein-Westfalen
Subject
General Chemistry,Catalysis
Cited by
1 articles.
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