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Three-dimensional study of compressed gas diffusion layers using synchrotron X-ray imaging

  • We present a synchrotron X-ray tomographic study on the morphology of carbon fiber-based gas diffusion layer (GDL) material under compression. A dedicated compression device is used to provide well-defined compression conditions. A flat compression punch is employed to study the fiber geometry at different degrees of compression. Transport relevant geometrical parameters such as porosity, pore size and tortuosity distributions are calculated. The geometric properties notably change upon compression which has direct impact on transport conditions for gas and fluid flow. The availability of broad 3D paths, which are most important for the transport of liquid water from the catalyst layer through the GDL, is markedly reduced after compression. In a second experiment, we study the influence of the channel-land-pattern of the flow-field on shape and microstructure of the GDL. A flow-field compression punch is employed to reproduce the inhomogeneous compression conditions found during fuelWe present a synchrotron X-ray tomographic study on the morphology of carbon fiber-based gas diffusion layer (GDL) material under compression. A dedicated compression device is used to provide well-defined compression conditions. A flat compression punch is employed to study the fiber geometry at different degrees of compression. Transport relevant geometrical parameters such as porosity, pore size and tortuosity distributions are calculated. The geometric properties notably change upon compression which has direct impact on transport conditions for gas and fluid flow. The availability of broad 3D paths, which are most important for the transport of liquid water from the catalyst layer through the GDL, is markedly reduced after compression. In a second experiment, we study the influence of the channel-land-pattern of the flow-field on shape and microstructure of the GDL. A flow-field compression punch is employed to reproduce the inhomogeneous compression conditions found during fuel cell assembly. While homogenously compressed underneath the land the GDL is much less and inhomogeneously compressed under the channel. The GDL material extends far into the channel volume where it can considerably influence gas and fluid flow. Loose fiber endings penetrate deeply into the channel and form obstacles for the discharge of liquid water droplets.zeige mehrzeige weniger

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Metadaten
Autor*innen:C. Tötzke, G. Gaiselmann, M. Osenberg, J. Bohner, Tobias Arlt, H. Markötter, A. Hilger, F. Wieder, Andreas KupschORCiD, Bernd R. MüllerORCiD, Manfred P. Hentschel, J. Banhart, V. Schmidt, W. Lehnert, I. Manke
Dokumenttyp:Zeitschriftenartikel
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Journal of power sources
Jahr der Erstveröffentlichung:2014
Verlag:Elsevier
Verlagsort:Amsterdam [u.a.]
Jahrgang/Band:253
Erste Seite:123
Letzte Seite:131
Freie Schlagwörter:Gas diffusion layer (GDL); Geometrical tortuosity; Microstructure; Pore size analysis; Synchrotron X-ray tomography; Water transport path
DOI:10.1016/j.jpowsour.2013.12.062
ISSN:0378-7753
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:16.01.2014
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