Dokument-ID Dokumenttyp Autoren/innen Persönliche Herausgeber/innen Haupttitel Abstract Auflage Verlagsort Verlag Herausgeber (Institution) Erscheinungsjahr Titel des übergeordneten Werkes Jahrgang/Band ISBN Veranstaltung Veranstaltungsort Beginndatum der Veranstaltung Enddatum der Veranstaltung Ausgabe/Heft Erste Seite Letzte Seite URN DOI Lizenz Datum der Freischaltung OPUS4-26434 Zeitschriftenartikel Markötter, H.; Alink, R.; Haußmann, J.; Dittmann, K.; Arlt, Tobias; Wieder, F.; Tötzke, C.; Klages, M.; Reiter, C.; Riesemeier, Heinrich; Scholta, J.; Gerteisen, D.; Banhart, J.; Manke, I. Visualization of the water distribution in perforated gas diffusion layers by means of synchrotron X-ray radiography Perforated gas diffusion layers (GDLs) of polymer electrolyte membrane fuel cells (PEMFCs) were investigated by means of in-situ synchrotron X-ray radiography during operation. We found a strong influence of perforations on the water distribution and transport in the investigated Toray TGP-H-090 GDL. The water occurs mainly around the perforations, while the holes themselves show varying water distributions. Some remain dry, while most of them fill up with liquid water after a certain period or might serve as drainage volume for effective water transport. Oxford Elsevier International Association for Hydrogen Energy 2012 International journal of hydrogen energy 37 9 7757 7761 10.1016/j.ijhydene.2012.01.141 2016-02-19 OPUS4-29979 Zeitschriftenartikel Tötzke, C.; Gaiselmann, G.; Osenberg, M.; Bohner, J.; Arlt, Tobias; Markötter, H.; Hilger, A.; Wieder, F.; Kupsch, Andreas; Müller, Bernd R.; Hentschel, Manfred P.; Banhart, J.; Schmidt, V.; Lehnert, W.; Manke, I. 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 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. Amsterdam [u.a.] Elsevier 2014 Journal of power sources 253 123 131 10.1016/j.jpowsour.2013.12.062 2016-02-20