Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 165, Issue 6, Pages F3271-F3280Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0291806jes
Keywords
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- NSERC Discovery Accelerator Program
- NSERC Canada Research Chairs Program
- Ontario Ministry of Research and Innovation Early Researcher Award
- Canada Foundation for Innovation
- Alexander von Humboldt foundation
- Impuls- und Vernetzungsfonds der Helmholtz Gesellschaft [VH-NG-616]
- German Federal Ministry for Economic Affairs and Energy project SoHMuSDaSS [03ET6057C]
- University of Toronto Connaught International Scholarship
- NSERC Canada Graduate Scholarship
- NSERC Michael Smith Foreign Study Supplement
- Ontario Graduate Scholarship
- University of Toronto Mary H. Beatty Fellowship
- Mercedes-Benz Canada Graduate Fellowship in Fuel Cell Research
- William Dunbar Memorial Scholarship in Mechanical Engineering
- Mercedes-Benz Canada Graduate Fellowship
- Ara Mooradian Scholarship
- HATCH Graduate Scholarship
- David Sanborn Scott AMP
- Ron D. Venter Fellowship
- David Sanborn Scott Fellowship
- Pierre Rivard Hydrogenics Graduate Fellowship
- Natural Sciences and Engineering Research Council of Canada
- University of Saskatchewan
- Government of Saskatchewan
- Western Economic Diversification Canada
- National Research Council Canada
- Canadian Institutes of Health Research
- CLS Post-Doctoral and Graduate Student Travel Support Program
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In this work, microporous layer (MPL) degradation was investigated through the characterization of polymer electrolyte membrane (PEM) fuel cell performance and in situ liquid water visualizations. While both the MPL and carbon fiber substrate underwent ex situ carbon corrosion-based degradation, the degradation of the MPL has the most significant impact on the electrochemical performance and the liquid water distribution within the operating PEM fuel cell. Specifically, MPL degradation resulted in larger quantities of liquid water accumulation within the gas diffusion layer (GDL), and we attributed this accumulation to the loss of MPL hydrophobicity caused by the carbon corrosion-based degradation process. The increased liquid water accumulation led to increased mass transport resistances and performance losses at high operating current densities (> 1.5 A/cm(2)). With increasing current density, the liquid water saturation profile converged to an upper threshold within GDLs with MPLs, whereas an upper liquid water saturation threshold was not observed for GDLs without MPLs. Predictions of long-term performance characteristics of PEM fuel cells should be informed by the proneness of the MPL to carbon corrosion degradation. (C) The Author(s) 2018. Published by ECS.
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