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Improved water transport in natural and artificial pore paths of gas diffusion layer in PEM fuel cells

Haußmann, Jan and Markötter, Henning and Bauder, Alexander and Alink, Robert and Klages, M. and Manke, Ingo and Gerteisen, Dietmar and Scholta, Joachim (2012) Improved water transport in natural and artificial pore paths of gas diffusion layer in PEM fuel cells. 19th World Hydrogen Energy Conference 2012, Toronto, Canada.

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Gas diffusion layer in PEM fuel cells have to fulfil many tasks: high electrical and thermal conductivity, gas and water transport. Different pore sizes and pore geometries in gas diffusion layer influence these parameters. For high current densities, water agglomerations in the porous medium limit the fuel cell performance. The geometry of the carbon fibre substrate and natural cracks in the micro porous layer form preferred water pathways through the porous structure. Synchrotron radiography and tomography studies prove the importance of these pore paths for the overall water distribution. Regarding the flow field design it is found that these water paths cause a draining effect, which transports water from under the land to the gas channel. For further improvement a higher and more regular distribution of cracks is necessary. To achieve this, laser perforation based on and mechanical milling techniques were applied. With this treatment a higher overall performance has been obtained due to the improved water transport. This has been proven by synchrotron imaging.

Item URL in elib:https://elib.dlr.de/77569/
Document Type:Conference or Workshop Item (Speech)
Title:Improved water transport in natural and artificial pore paths of gas diffusion layer in PEM fuel cells
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Markötter, HenningHZ BerlinUNSPECIFIED
Bauder, Alexanderalexander.bauder (at) dlr.deUNSPECIFIED
Alink, RobertISE FreiburgUNSPECIFIED
Gerteisen, DietmarISE FreiburgUNSPECIFIED
Scholta, JoachimZSW UlmUNSPECIFIED
Date:June 2012
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:PEM, GDL, water transport, synchrotron imaging
Event Title:19th World Hydrogen Energy Conference 2012
Event Location:Toronto, Canada
Event Type:international Conference
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Fuel Cells (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Elektrochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Bauder, Alexander
Deposited On:05 Nov 2012 15:26
Last Modified:05 Nov 2012 15:26

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