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Self-supporting Microporous Layers (MPLs) for PEM fuel cells

Bauder, Alexander and Haußmann, Jan and Markötter, Henning and Alink, Robert and Manke, Ingo and Scholta, Joachim and Friedrich, Kaspar Andreas (2012) Self-supporting Microporous Layers (MPLs) for PEM fuel cells. In: ECS Transactions. 3rd CARISMA International Conference on Medium and High Temperature Proton Exchange Membrane Fuel Cells, 2013-10-27 - 2013-11-01, Kopenhagen, Dänemark. doi: 10.1149/05801.1391ecst. ISBN 978-160768539-5. ISSN 1938-6737.

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Abstract

The main requirements of a gas diffusion layer (GDL) of polymer electrolyte membrane fuel cells (PEMFC) are the provision of a gas and water transport as well as a significant electrical and thermal conductivity. The development of membrane electrode assemblies (MEA) for a wide temperature range (-20°C until +130°C) still favours membranes that require a certain level of humidification for sufficient proton conductivity. For the improvement of PEMFC diffusion media for these conditions, the still mostly unknown influence of the micro porous layer (MPL) on fuel cell performance is a major obstacle. An important function of the cathode side MPL at high temperature operation of PEMFCs is the prevention of membrane drying. However, concurrently a flooding of porous structures in the GDL or catalyst layers at lower temperatures has to be avoided. To get an insight that could lead to an improved GDL design for a broad range of operating conditions, a self-supporting MPL was developed, because this allows the manufacturing and the following treatments of the MPL independent from the GDL substrate. This MPL consists of a thin nonwoven synthetics coated on one side with a mixture of carbon and PTFE produced with the dry spraying technology. For in-situ experiments and some ex-situ measurements these layers are pressed with the non coated side on a commercial GDL without MPL (Sigracet® GDL25BA from SGL). To get a correlation of fuel cell performance to the global intrinsic properties of the MPL, like through-plane permeability, electrical conductivity or hydrophobicity, U(i)-curves up to limiting current densities and electrochemical impedance spectra are measured in a 5 cm² fuel cell setup. To obtain information about the influence of MPL structure on water distribution, synchrotron X-ray radiography studies were performed additionally. In such studies the importance of liquid water pathways through the porous structure for the water management is proven. With artificial paths in a carbon fibre GDL produced by laser perforation an overall performance gain has been obtained. With selfsupporting MPLs it was feasible to investigate the liquid water transport of nonperforated GDL/MPLs compared to the perforation of both layers as well as to the exclusive perforation of MPL and the GDL, by means of in-situ synchrotron imaging.

Item URL in elib:https://elib.dlr.de/77573/
Document Type:Conference or Workshop Item (Speech)
Title:Self-supporting Microporous Layers (MPLs) for PEM fuel cells
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bauder, AlexanderUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Haußmann, JanZSW UlmUNSPECIFIEDUNSPECIFIED
Markötter, HenningHZ BerlinUNSPECIFIEDUNSPECIFIED
Alink, RobertISE FreiburgUNSPECIFIEDUNSPECIFIED
Manke, IngoHZ BerlinUNSPECIFIEDUNSPECIFIED
Scholta, JoachimZSW UlmUNSPECIFIEDUNSPECIFIED
Friedrich, Kaspar AndreasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:September 2012
Journal or Publication Title:ECS Transactions
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
DOI:10.1149/05801.1391ecst
ISSN:1938-6737
ISBN:978-160768539-5
Status:Published
Keywords:PEM, GDL, MPL, water management, synchrotron imaging
Event Title:3rd CARISMA International Conference on Medium and High Temperature Proton Exchange Membrane Fuel Cells
Event Location:Kopenhagen, Dänemark
Event Type:international Conference
Event Start Date:27 October 2013
Event End Date:1 November 2013
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 15:31
Last Modified:17 Oct 2024 15:02

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