首页|The influence of electrode crack dimensions on the durability of polymer electrolyte membrane fuel cells

The influence of electrode crack dimensions on the durability of polymer electrolyte membrane fuel cells

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  • NSTL
  • Elsevier
© 2024 Elsevier B.V.Electrode cracks in polymer electrolyte membrane fuel cells (PEMFCs) are correlated with early onset failures. In this work we investigate the influence of cracked gas diffusion electrodes (GDEs) on the durability of the membrane electrode assembly (MEA) using a combined chemical-mechanical accelerated stress test (AST). Electrode crack dimensions were systematically tuned using ink formulations and material selection strategies. A parameter to describe the crack width areal density (ΦCW) was used to quantify the degree of discontinuity in the electrode surfaces. Open circuit voltage (OCV) transient analyses were used to benchmark and characterize the failure mechanisms in the MEAs as a function of the ΦCW. While smaller electrode-level cracks, on the order of microns, yielded a 28 % decrease in operating lifetime, larger cracks that propagated from a discontinuous, microporous layer (MPL) coating, decreased the operating lifetime by 56 %. This work emphasizes the need for material processing strategies that consider defect tolerances to limit membrane failures in PEMFCs.

Accelerated stress testElectrode crackElectrode morphologyGas diffusion electrodeMPL crackPolymer electrolyte membrane fuel cell

Taylor A.K.、Hu L.、Rodriguez-Nazario A.、Young J.L.、Neyerlin K.C.、Baez-Cotto C.M.、Mauger S.A.、Smith C.

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Chemistry and Nanoscience Center National Renewable Energy Laboratory

Materials Science Center National Renewable Energy Laboratory

Strategic Energy Analysis Center National Renewable Energy Laboratory

2025

10.1016/j.jpowsour.2024.235884

Journal of power sources

Journal of power sources

SCI
ISSN：0378-7753
年,卷(期)：2025.628(Feb.1)
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