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Investigation of Gas Diffusion Layer Perforations on the water transport in PEM fuel cells with synchrotron imaging

Haußmann, Jan and Markötter, Henning and Alink, Robert and Dittmann, K. and Bauder, Alexander and Manke, Ingo and Gerteisen, Dietmar and Scholta, Joachim (2012) Investigation of Gas Diffusion Layer Perforations on the water transport in PEM fuel cells with synchrotron imaging. 13th UECT, 3.-5. Jul. 2012, Ulm, Deutschland.

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With increasing performance of PEM fuel cells water transport in Gas Diffusion Layer becomes more and more a critical aspect. High humidity conditions, which are favoured for proton conducting membranes, enhance the problem of water condensation and removal. A well designed GDL can help to avoid critical operation conditions, which can decrease performance and lifetime. One way of possible improvement is to add artificial pore paths to the porous GDL structure. Vertically arranged paths can guide liquid water more easily from the electrode to the channel due to the lowered capillary pressure. To achieve this, laser perforation and mechanical milling were used to apply perforations to the GDL. From former investigations, it is known that natural cracks in Micro Porous Layer (MPL) serve as transport ways for liquid water. GDL with separately perforated MPL are considered in this work as well. For investigation of liquid water transport, synchrotron radiography and tomography have proven to be suitable measurement techniques. Thus, water transport dynamics and 3D water distribution were analyzed regarding to the influence of the different perforation techniques. It showed that perforations fill with water under high humidity conditions and may serve as transport ways, as well. By comparing laser and mechanical treated GDL, a difference in the filling behaviour was observed. Laser treated material looses PTFE content due to high temperatures and the perforation area gets hydrophilic, whereas mechanical treatment showed less influence to the surface properties of the surroundings. This result was proved by EDX measurements (F distribution) and by hydro head analysis (influence on water transport behaviour). Finally, performance tests showed the difference between the perforation techniques and different perforation diameters. It has been proven that perforating of GDL enhances the performance compared to unperforated material, especially under high humidity conditions.

Item URL in elib:https://elib.dlr.de/77572/
Document Type:Conference or Workshop Item (Poster)
Title:Investigation of Gas Diffusion Layer Perforations on the water transport in PEM fuel cells with synchrotron imaging
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Markötter, HenningHZ BerlinUNSPECIFIED
Alink, RobertISE FreiburgUNSPECIFIED
Dittmann, K.HZ BerlinUNSPECIFIED
Bauder, Alexanderalexander.bauder (at) dlr.deUNSPECIFIED
Gerteisen, DietmarISE FreiburgUNSPECIFIED
Scholta, JoachimZSW UlmUNSPECIFIED
Date:July 2012
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:PEM, GDL, synchrotron imaging
Event Title:13th UECT
Event Location:Ulm, Deutschland
Event Type:international Conference
Event Dates:3.-5. Jul. 2012
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 15:29
Last Modified:05 Nov 2012 15:29

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