Christian Tötzke, G. Gaiselmann, M. Osenberg, T. Arlt, H. Markötter, A. Hilger, Andreas Kupsch, B. R. Müller, V. Schmidt, W. Lehnert, Ingo Manke
- Carbon fiber based felt materials are widely used as gas diffusion layer (GDL) in fuel cells. Their transport properties can be adjusted by adding hydrophobic agents such as polytetrafluoroethylene (PTFE). We present a synchrotron X-ray tomographic study on the felt material Freudenberg H2315 with different PIPE finishing. In this study, we analyze changes in microstructure and shape of GDLs at increasing degree of compression which are related to their specific PTFE load. A dedicated compression device mimicking the channel-land pattern of the flowfield is used to reproduce the inhomogeneous compression found in a fuel cell. Transport relevant geometrical parameters such as porosity, pore size distribution and geometric tortuosity are calculated and consequences for media transport discussed. PTFE finishing results in a marked change of shape of compressed GDLs: surface is smoothed and the invasion of GDL fibers into the flow field channel strongly mitigated. Furthermore, the PTFE impacts the microstructure of the compressed GDL. TheCarbon fiber based felt materials are widely used as gas diffusion layer (GDL) in fuel cells. Their transport properties can be adjusted by adding hydrophobic agents such as polytetrafluoroethylene (PTFE). We present a synchrotron X-ray tomographic study on the felt material Freudenberg H2315 with different PIPE finishing. In this study, we analyze changes in microstructure and shape of GDLs at increasing degree of compression which are related to their specific PTFE load. A dedicated compression device mimicking the channel-land pattern of the flowfield is used to reproduce the inhomogeneous compression found in a fuel cell. Transport relevant geometrical parameters such as porosity, pore size distribution and geometric tortuosity are calculated and consequences for media transport discussed. PTFE finishing results in a marked change of shape of compressed GDLs: surface is smoothed and the invasion of GDL fibers into the flow field channel strongly mitigated. Furthermore, the PTFE impacts the microstructure of the compressed GDL. The number of available wide transport paths is significantly increased as compared to the untreated material. These changes improve the transport capacity liquid water through the GDL and promote the discharge of liquid water droplets from the cell. (C) 2016 Elsevier B.V. All rights reserved.…
MetadatenVerfasserangaben: | Christian TötzkeORCiDGND, G. Gaiselmann, M. Osenberg, T. Arlt, H. Markötter, A. Hilger, Andreas KupschORCiD, B. R. Müller, V. Schmidt, W. Lehnert, Ingo MankeORCiD |
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DOI: | https://doi.org/10.1016/j.jpowsour.2016.05.118 |
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ISSN: | 0378-7753 |
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ISSN: | 1873-2755 |
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Titel des übergeordneten Werks (Englisch): | Journal of power sources : the international journal on the science and technology of electrochemical energy systems |
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Verlag: | Elsevier |
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Verlagsort: | Amsterdam |
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Publikationstyp: | Wissenschaftlicher Artikel |
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Sprache: | Englisch |
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Jahr der Erstveröffentlichung: | 2016 |
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Erscheinungsjahr: | 2016 |
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Datum der Freischaltung: | 22.03.2020 |
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Freies Schlagwort / Tag: | Compression; Gas diffusion layer; Hydrophobic treatment; Synchrotron tomography; Water transport |
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Band: | 324 |
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Seitenanzahl: | 12 |
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Erste Seite: | 625 |
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Letzte Seite: | 636 |
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Fördernde Institution: | German Federal Ministry for Education and Science (BMBF) [05M10KTA, 05M10CJA, 05M10VUA, 05M10DAA] |
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Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
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Peer Review: | Referiert |
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Name der Einrichtung zum Zeitpunkt der Publikation: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Erd- und Umweltwissenschaften |
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