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Hydrophobicity Patterning of Gas Diffusion Media and Performance in Polymer Electrolyte Fuel Cells

Biswas, Indro and Gazdzicki, Pawel and Helmly, Stefan and Schulze, Mathias (2016) Hydrophobicity Patterning of Gas Diffusion Media and Performance in Polymer Electrolyte Fuel Cells. 6th Baltic Electrochemistry Conference, 15.-17.6. 2016, Helsinki, Finnland.

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Abstract

Polymer electrolyte fuel cells with their high gravimetric energy density face a water balance problem especially under variable loads, e.g. automotive operation: The excess product water needs to be removed from the fuel cell while maintaining a humidified membrane. The gas diffusion layer (GDL), which also provides contact to the electrochemically active components, is responsible for a passive water management of the cell. The adjustment of the hydrophobicity of the GDL is crucial for stable operation. In polymer electrolyte fuel cells they typically consist of conductive medium, either a carbon based powder in the microporous layer or carbon felt/fibres/cloth in the macroporous backing, and a hydrophobicity impregnation agent like polytetrafluoroethylene (PTFE). The ratio determines the hydrophobicity and thus the performance. Modifications of the hydrophobicity were applied with the goal to form a structured, non-uniform wettability of the gas diffusion media, thus introducing more hydrophilic evasion pathways for water while maintaining more hydrophobic areas. It is shown, that these modifications can result in considerable performance improvement and more homogeneous current density.

Item URL in elib:https://elib.dlr.de/109673/
Document Type:Conference or Workshop Item (Poster)
Title:Hydrophobicity Patterning of Gas Diffusion Media and Performance in Polymer Electrolyte Fuel Cells
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Biswas, Indroindro.biswas (at) dlr.deUNSPECIFIED
Gazdzicki, Pawelpawel.gazdzicki (at) dlr.deUNSPECIFIED
Helmly, Stefanstefan.helmly (at) dlr.deUNSPECIFIED
Schulze, Mathiasmathias.schulze (at) dlr.deUNSPECIFIED
Date:16 June 2016
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:PEM-Brennstoffzellen; Gasdiffusionsmaterialien; Laser; Leistungsdichte; Stromdichteverteilung
Event Title:6th Baltic Electrochemistry Conference
Event Location:Helsinki, Finnland
Event Type:international Conference
Event Dates:15.-17.6. 2016
Organizer:Aalto-Yliopisto
HGF - Research field:Energy
HGF - Program:Energy Efficiency, Materials and Resources
HGF - Program Themes:Methods and Concepts for Materials Development
DLR - Research area:Energy
DLR - Program:E VG - Combustion and Gas Turbine Technologies
DLR - Research theme (Project):E - Materials for Energy Technologies (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Biswas, Indro
Deposited On:15 Dec 2016 15:27
Last Modified:31 Jul 2019 20:06

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