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A dedicated compression device for high resolution X-ray tomography of compressed gas diffusion layers

  • We present an experimental approach to study the three-dimensional microstructure of gas diffusion layer (GDL) materials under realistic compression conditions. A dedicated compression device was designed that allows for synchrotron-tomographic investigation of circular samples under well-defined compression conditions. The tomographic data provide the experimental basis for stochastic modeling of nonwoven GDL materials. A plain compression tool is used to study the fiber courses in the material at different compression stages. Transport relevant geometrical parameters, such as porosity, pore size, and tortuosity distributions, are exemplarily evaluated for a GDL sample in the uncompressed state and for a compression of 30 vol.%. To mimic the geometry of the flow-field, we employed a compression punch with an integrated channel-rib-profile. It turned out that the GDL material is homogeneously compressed under the ribs, however, much less compressed underneath the channel. GDL fibersWe present an experimental approach to study the three-dimensional microstructure of gas diffusion layer (GDL) materials under realistic compression conditions. A dedicated compression device was designed that allows for synchrotron-tomographic investigation of circular samples under well-defined compression conditions. The tomographic data provide the experimental basis for stochastic modeling of nonwoven GDL materials. A plain compression tool is used to study the fiber courses in the material at different compression stages. Transport relevant geometrical parameters, such as porosity, pore size, and tortuosity distributions, are exemplarily evaluated for a GDL sample in the uncompressed state and for a compression of 30 vol.%. To mimic the geometry of the flow-field, we employed a compression punch with an integrated channel-rib-profile. It turned out that the GDL material is homogeneously compressed under the ribs, however, much less compressed underneath the channel. GDL fibers extend far into the channel volume where they might interfere with the convective gas transport and the removal of liquid water from the cell.zeige mehrzeige weniger

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Metadaten
Autor*innen:C. Tötzke, I. Manke, G. Gaiselmann, J. Bohner, Bernd R. MüllerORCiD, Andreas KupschORCiD, Manfred P. Hentschel, V. Schmidt, J. Banhart, W. Lehnert
Dokumenttyp:Zeitschriftenartikel
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Review of scientific instruments
Jahr der Erstveröffentlichung:2015
Verlag:American Institute of Physics
Verlagsort:Melville, NY, USA
Jahrgang/Band:86
Ausgabe/Heft:4
Erste Seite:043702-1
Letzte Seite:043702-6
Freie Schlagwörter:Compression device; Gas diffusion layer (GDL); PEM fuel cell; Synchrotron; Tortuosity; X-ray tomography
DOI:10.1063/1.4918291
ISSN:0034-6748
ISSN:1089-7623
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:23.04.2015
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