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dc.contributor.authorGarcia-Salaberri, Pablo A.
dc.contributor.authorZenyuk, Iryna V.
dc.contributor.authorHwang, Gisuk
dc.contributor.authorVera, Marcos
dc.contributor.authorWeber, Adam Z.
dc.contributor.authorGostick, Jeff T.
dc.identifier.citationGarcia-Salaberri, Pablo A.; Zenyuk, Iryna V.; Hwang, Gisuk; Vera, Marcos; Weber, Adam Z.; Gostick, Jeff T. 2019. Implications of inherent inhomogeneities in thin carbon fiber-based gas diffusion layers: a comparative modeling study. Electrochimica Acta, vol. 295:pp 861-874en_US
dc.descriptionClick on the DOI link to access the article (may not be free).en_US
dc.description.abstractThin porous media are present in multiple electrochemical energy devices, where they provide key transport and structural functions. The prototypical example is gas diffusion layers (GDLs) in polymer-electrolyte fuel cells (PEFCs). While modeling has traditionally been used to explore PEFC operation, this is often accomplished using volume-averaged (VA) formulations, where the intrinsic inhomogeneities of the GDL are smoothed out and the lack of defining a representative elementary volume is an ever-present issue. In this work, the predictions of a single-phase VA PEFC model are compared to those of a pore-scale PEFC model using GDL tomograms as a part of the meshed domain to delineate important aspects that VA models cannot address. The results demonstrate that while VA models equipped with suitable effective properties can provide a good average estimate for overall performance, the lack of accounting for real structures limits their predictive power, especially for durability and degradation behavior where large deviations are found in the spatial distributions. Furthermore, interfacial effects between the GDL and the microporous layer are explored with the pore-scale model to understand the implications of the layered geometry. It is shown that the actual microstructure of the GDL/ MPL transition region can significantly affect the fluxes across the sandwich, something that VA models cannot easily consider. Interfacial design is recognized as a key quality control parameter for large-scale MEA manufacturing and assembly.en_US
dc.description.sponsorshipFuel Cell Performance and Durability Consortium (FC-PAD) by the Fuel Cell Technologies Office (FCTO), Office of Energy Efficiency and Renewable Energy (EERE), of the U.S. Department of Energy under contract number DE-AC02-05CH11231, by the Project ENE2015-68703-C2-1-R (MINECO/FEDER, UE), and by the the research grant 'Ayudas a la Investigacion en Energia y Medio Ambiente' awarded to the first author by the Spanish Iberdrola Foundation. Dr. Iryna V. Zenyuk would like to acknowledge support from the National Science Foundation, United States under CBET Award 1605159. X-ray tomography experiments were performed on beamline 8.3.2 at the ALS, which is a national user facility funded by the Department of Energy, Office of Basic Energy Sciences under contract DE-AC02-05CH11231.en_US
dc.relation.ispartofseriesElectrochimica Acta;v.295
dc.subjectGas diffusion layeren_US
dc.subjectPolymer electrolyte fuel cellen_US
dc.subjectPore scaleen_US
dc.titleImplications of inherent inhomogeneities in thin carbon fiber-based gas diffusion layers: a comparative modeling studyen_US
dc.rights.holder© 2018 Elsevier Ltd. All rights reserved.en_US

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