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Non-uniform Hydrophobicity in Gas Diffusion Media of Polymer Electrolyte Fuel Cell Components

Biswas, Indro und Gazdzicki, Pawel und Tomas, Martin und Schulze, Mathias (2015) Non-uniform Hydrophobicity in Gas Diffusion Media of Polymer Electrolyte Fuel Cell Components. GDCh-Wissenschaftsforum 2015, 2015-08-30 - 2015-09-02, Dresden, Deutschland.

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Kurzfassung

Polymer electrolyte fuel cells with their high gravimetric energy density face a water balance problem especially under variable loads, which represents normal 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, and non-uniform hydrophobicity has already been shown to be advantageous. In polymer electrolyte fuel cells (PEFC) they typically consist of conductive medium, either a carbon based powder in the microporous layer (MPL) 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, in particular with the goal to form a non-uniform wettability to the gas diffusion media, thus introducing in parallel more hydrophilic pathways for water while maintaining more hydrophobic areas. Modifications applied by irradiation with laser, x-ray, and ion-beam were assessed and correlated to the alterations of hydrophobicity and tested for improvements. It was observed, that while a direct improvement in output power could not be achieved with pure hydrophobicity modifications, the current density distribution in a running fuel cell was more homogeneous. Both the areas of extremely high and low current densities were reduced. Due to the close correlation of these extreme conditions and the degradation of PEFCs, it can be expected, that the durability is increased with the applied non-uniform surface modifications. References [1] P. Kuttanikkad, M. Prat, J. Pauchet, Pore-network simulations of two-phase flow in a thin porous layer of mixed wettability: Application to water transport in gas diffusion layers of proton exchange membrane fuel cells, J. Power Sources 196 (2011) 1145. [2] M. Schulze, C. Christenn, XPS investigation of the PTFE induced hydrophobic properties of electrodes for low temperature fuel cells, App. Surf. Sci. 252.

elib-URL des Eintrags:https://elib.dlr.de/99186/
Dokumentart:Konferenzbeitrag (Poster)
Titel:Non-uniform Hydrophobicity in Gas Diffusion Media of Polymer Electrolyte Fuel Cell Components
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Biswas, Indroindro.biswas (at) dlr.dehttps://orcid.org/0000-0002-6815-4204NICHT SPEZIFIZIERT
Gazdzicki, Pawelpawel.gazdzicki (at) dlr.dehttps://orcid.org/0000-0002-5728-7861NICHT SPEZIFIZIERT
Tomas, Martinmtomas (at) ntc.zcu.czNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schulze, Mathiasmathias.schulze (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:31 August 2015
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:fuel cells, polymer electrolyte membrane, gas diffusion media, hydrophobicity, patterning,
Veranstaltungstitel:GDCh-Wissenschaftsforum 2015
Veranstaltungsort:Dresden, Deutschland
Veranstaltungsart:nationale Konferenz
Veranstaltungsbeginn:30 August 2015
Veranstaltungsende:2 September 2015
Veranstalter :GDCh
HGF - Forschungsbereich:Energie
HGF - Programm:Rationelle Energieumwandlung und Nutzung (alt)
HGF - Programmthema:keine Zuordnung (alt)
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E VG - Verbrennungs- und Gasturbinentechnik
DLR - Teilgebiet (Projekt, Vorhaben):E - Materialien für die Energietechnik (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Elektrochemische Energietechnik
Hinterlegt von: Biswas, Dr. Indro
Hinterlegt am:16 Nov 2015 11:54
Letzte Änderung:24 Apr 2024 20:04

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