- 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.…
MetadatenAuthor details: | Christian TötzkeORCiDGND, Ingo MankeORCiD, Gerd Gaiselmann, John Bohner, Bernd R. Müller, Andreas KupschORCiD, Manfred P. Hentschel, Volker Schmidt, Jens Banhart, Werner Lehnert |
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DOI: | https://doi.org/10.1063/1.4918291 |
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ISSN: | 0034-6748 |
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ISSN: | 1089-7623 |
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Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/25933863 |
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Title of parent work (English): | Review of scientific instruments : a monthly journal devoted to scientific instruments, apparatus, and techniques |
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Publisher: | American Institute of Physics |
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Place of publishing: | Melville |
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Publication type: | Article |
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Language: | English |
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Year of first publication: | 2015 |
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Publication year: | 2015 |
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Release date: | 2017/03/27 |
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Volume: | 86 |
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Issue: | 4 |
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Number of pages: | 6 |
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Funding institution: | German Federal Ministry for Education and Science (BMBF) [05M10KTA,
05M10CJA, 05M10VUA, 05M10DAA] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
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Peer review: | Referiert |
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Institution name at the time of the publication: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Erd- und Umweltwissenschaften |
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