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Synchrotron radiography and tomography of water transport in perforated gas diffusion media

Haußmann, Jan and Markötter, Henning and Alink, Robert and Bauder, Alexander and Dittmann, K. and Manke, Ingo and Scholta, Joachim (2013) Synchrotron radiography and tomography of water transport in perforated gas diffusion media. Journal of Power Sources, 239, pp. 611-622. Elsevier. DOI: 10.1016/j.jpowsour.2013.02.014 ISSN 0378-7753

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Water transport in gas diffusion media (GDM) is investigated by synchrotron radiography and tomography. It is demonstrated that micro porous layer (MPL) cracks improve the water management in polymer electrolyte membrane (PEM) fuel cells. A further treatment by means of laser perforation is expected to enhance this effect. The radiography analysis reveals that water transport is practically not influenced by perforations applied only to the MPL. In contrast, perforations through the whole GDM (including the MPL) have a strong influence on the overall water transport behavior and are therefore considered for a deeper analysis. Performance measurements show a correlation between the perforation size and the fuel cell power density. An optimum is found for a perforation diameter of 60 µm. Synchrotron tomography analysis reveals that this optimum is due to an improved draining effect on the area around the perforation. Moreover, SEM and EDX analysis show a loss of PTFE on the GDM surface in the vicinity of the perforation due to the laser processing. The tomography images reveal water accumulations in this area that can be explained by the hydrophilic surface.

Item URL in elib:https://elib.dlr.de/84946/
Document Type:Article
Title:Synchrotron radiography and tomography of water transport in perforated gas diffusion media
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Markötter, HenningHZ BerlinUNSPECIFIED
Alink, RobertISE FreiburgUNSPECIFIED
Bauder, Alexanderalexander.bauder (at) dlr.deUNSPECIFIED
Dittmann, K.HZ BerlinUNSPECIFIED
Scholta, JoachimZSW UlmUNSPECIFIED
Journal or Publication Title:Journal of Power Sources
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.jpowsour.2013.02.014
Page Range:pp. 611-622
Keywords:PEM fuel cell, Gas diffusion layer perforation, Micro porous layer crack, Water transport, Synchrotron X-ray imaging
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 2013 15:22
Last Modified:05 Nov 2013 15:22

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