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Anode defects propagation in Polymer Electrolyte Membrane Fuel Cells

Abstract : Defects-propagation in Polymer Electrolyte Membrane Fuel Cells Membrane Electrode Assemblies is investigated via Accelerated Stress Tests (ASTs) combining load (hence potential) and load-driven humidity cycling, and Open-Circuit Voltage. Customized MEA with lack of anode Catalyst Layer (CL) at two different locations: near the hydrogen inlet or outlet are fabricated and subjected to the AST. Periodical electrochemical characterizations are performed using a segmented cell, enabling to track the cell performance and anode/cathode ElectroChemical Surface Area (ECSA) over the test period with a spatial resolution along the gas channels. These observations are completed by post mortem analyses of the MEA. The MEA accelerated degradation is obvious, with multiple impacts on the cell performance and materials. In term of anode ECSA, the anode defect propagates in the hydrogen flow direction. The cathode ECSA is also impacted, although seemingly homogeneously. Significant membrane thinning is observed for the defective segments, without propagation to the adjacent ones. Anode and cathode local potential monitoring during the AST reveals the absence of cathode high-potential excursion, in both the segments with/without initial defects: the membrane and anode accelerated degradation is governed by chemical mechanisms like gas crossover rather than electrochemical mechanisms induced by high-potential excursions.
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https://hal-cea.archives-ouvertes.fr/cea-03508719
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Submitted on : Monday, January 3, 2022 - 6:00:05 PM
Last modification on : Wednesday, January 5, 2022 - 3:26:51 AM

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  • HAL Id : cea-03508719, version 1

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Salah Touhami, Marie Crouillere, Julia Mainka, Jérôme Dillet, Christine Nayoze, et al.. Anode defects propagation in Polymer Electrolyte Membrane Fuel Cells. Journal of Power Sources, Elsevier, 2021, 520, pp.230880. ⟨cea-03508719⟩

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