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Durability of PEMFC Electrodes and Reduction of Pt Loading

Gazdzicki, Pawel und Mitzel, Jens und Garcia Sanchez, Daniel und Dreizler, Andreas und Schulze, Mathias und Friedrich, Andreas (2018) Durability of PEMFC Electrodes and Reduction of Pt Loading. 233rd ECS Meeting, 13.-17. Mai 2018, Seattle, USA.

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Kurzfassung

A particular challenge related to low temperature polymer electrolyte fuel cells (PEMFC) is to maintain high performance and long-term durability concurrently with the further reduction of Pt loading. These are conflicting goals because of a direct correlation of Pt surface with activity and Pt amount with durability. Moreover the lack of common procedures to reliably determine voltage loss rates leads to severe difficulties in the comparison of results obtained by different institutions or projects. Accordingly, special attention is devoted to the discrimination between irreversible and reversible voltage losses. Regarding the influence of Pt loading on PEMFC performance and durability our recent rainbow stack study performed in dynamic operation shows that for Pt/C based cathodes a sudden drop of performance is observed for loadings <=0.2 mgPtcm-2 and current densities >1 Acm-2. A similar threshold value is found for the increase of irreversible voltage losses which lead to a reduction of PEMFC durability for cathodes with <=0.2-0.3 mgPt/cm2. Another durability issue at cathodic loadings <0.4 mgPt/cm2 is the acceleration of reversible degradation leading to a significant voltage drop at continuous fuel cell operation. The results show that the Pt loading of Pt/C based electrodes cannot be reduced below 0.2-0.3 mgPtcm-2 by just varying the thickness of the catalyst layers without suffering durability issue. To go below 0.2 mgPtcm-2 new electrode designs are needed. A special combination of coating techniques is also considered as promising approach to solve this issue. The research leading to these results has received funding from the European Union's Seventh Framework Programme (FP7/2007-2013) for Fuel Cell and Hydrogen Joint Technology Initiative under Grant No. 303452 (Impact).

elib-URL des Eintrags:https://elib.dlr.de/122585/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Durability of PEMFC Electrodes and Reduction of Pt Loading
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Gazdzicki, Pawelpawel.gazdzicki (at) dlr.dehttps://orcid.org/0000-0002-5728-7861NICHT SPEZIFIZIERT
Mitzel, JensJens.Mitzel (at) dlr.dehttps://orcid.org/0000-0001-8137-9689NICHT SPEZIFIZIERT
Garcia Sanchez, Danieldaniel.garciasanchez (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Dreizler, AndreasAndreas.Dreizler (at) dlr.dehttps://orcid.org/0000-0003-2681-6350NICHT SPEZIFIZIERT
Schulze, Mathiasmathias.schulze (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Friedrich, Andreasandreas.friedrich (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:13 Mai 2018
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Polymer electrolyte membrane fuel cells Degradation Low loading
Veranstaltungstitel:233rd ECS Meeting
Veranstaltungsort:Seattle, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:13.-17. Mai 2018
HGF - Forschungsbereich:Energie
HGF - Programm:Speicher und vernetzte Infrastrukturen
HGF - Programmthema:Brennstoffzellen
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SP - Energiespeicher
DLR - Teilgebiet (Projekt, Vorhaben):E - Elektrochemische Prozesse (Brennstoffzellen) (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Elektrochemische Energietechnik
Hinterlegt von: Mitzel, Dr. Jens
Hinterlegt am:29 Okt 2018 14:53
Letzte Änderung:29 Mär 2023 00:38

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