• Login
    View Item 
    •   Shocker Open Access Repository Home
    • Engineering
    • Mechanical Engineering
    • ME Research Publications
    • View Item
    •   Shocker Open Access Repository Home
    • Engineering
    • Mechanical Engineering
    • ME Research Publications
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Implications of inherent inhomogeneities in thin carbon fiber-based gas diffusion layers: a comparative modeling study

    Date
    2019-02-01
    Author
    Garcia-Salaberri, Pablo A.
    Zenyuk, Iryna V.
    Hwang, Gisuk
    Vera, Marcos
    Weber, Adam Z.
    Gostick, Jeff T.
    Metadata
    Show full item record
    Citation
    Garcia-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 861-874
    Abstract
    Thin 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.
    Description
    Click on the DOI link to access the article (may not be free).
    URI
    https://doi.org/10.1016/j.electacta.2018.09.089
    http://hdl.handle.net/10057/15738
    Collections
    • ME Research Publications

    Browse

    All of Shocker Open Access RepositoryCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsBy TypeThis CollectionBy Issue DateAuthorsTitlesSubjectsBy Type

    My Account

    LoginRegister

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    DSpace software copyright © 2002-2023  DuraSpace
    DSpace Express is a service operated by 
    Atmire NV