- 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 fibers extend far into the channel volume where they mightWe 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. (C) 2015 AIP Publishing LLC.…
MetadatenVerfasserangaben: | Christian TötzkeORCiDGND, Ingo MankeORCiD, Gerd Gaiselmann, John Bohner, Bernd R. Müller, Andreas KupschORCiD, Manfred P. Hentschel, Volker Schmidt, Jens Banhart, Werner Lehnert |
---|
DOI: | https://doi.org/10.1063/1.4918291 |
---|
ISSN: | 0034-6748 |
---|
ISSN: | 1089-7623 |
---|
Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/25933863 |
---|
Titel des übergeordneten Werks (Englisch): | Review of scientific instruments : a monthly journal devoted to scientific instruments, apparatus, and techniques |
---|
Verlag: | American Institute of Physics |
---|
Verlagsort: | Melville |
---|
Publikationstyp: | Wissenschaftlicher Artikel |
---|
Sprache: | Englisch |
---|
Jahr der Erstveröffentlichung: | 2015 |
---|
Erscheinungsjahr: | 2015 |
---|
Datum der Freischaltung: | 27.03.2017 |
---|
Band: | 86 |
---|
Ausgabe: | 4 |
---|
Seitenanzahl: | 6 |
---|
Fördernde Institution: | German Federal Ministry for Education and Science (BMBF) [05M10KTA,
05M10CJA, 05M10VUA, 05M10DAA] |
---|
Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
---|
Peer Review: | Referiert |
---|
Name der Einrichtung zum Zeitpunkt der Publikation: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Erd- und Umweltwissenschaften |
---|