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Toward a Comprehensive Understanding of Cation Effects in Proton Exchange Membrane Fuel Cells.
- Source :
- ACS applied materials & interfaces; vol 14, iss 31, 35555-35568; 1944-8244
- Publication Year :
- 2022
-
Abstract
- Metal alloy catalysts (e.g., Pt-Co) are widely used in fuel cells for improving the oxygen reduction reaction kinetics. Despite the promise, the leaching of the alloying element contaminates the ionomer/membrane, leading to poor durability. However, the underlying mechanisms by which cation contamination affects fuel cell performance remain poorly understood. Here, we provide a comprehensive understanding of cation contamination effects through the controlled doping of electrodes. We couple electrochemical testing results with membrane conductivity/water uptake measurements and impedance modeling to pinpoint where and how the losses in performance occur. We identify that (1) ∼44% of Co2+ exchange of the ionomer can be tolerated in the electrode, (2) loss in performance is predominantly induced by O2 and proton transport losses, and (3) Co2+ preferentially resides in the electrode under wet operating conditions. Our results provide a first-of-its-kind mechanistic explanation for cation effects and inform strategies for mitigating these undesired effects when using alloy catalysts.
Details
- Database :
- OAIster
- Journal :
- ACS applied materials & interfaces; vol 14, iss 31, 35555-35568; 1944-8244
- Notes :
- application/pdf, ACS applied materials & interfaces vol 14, iss 31, 35555-35568 1944-8244
- Publication Type :
- Electronic Resource
- Accession number :
- edsoai.on1367456912
- Document Type :
- Electronic Resource