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Influence of Platinum Deposits on Properties and Degradation of Nafion® Membranes

Friedrich, K. Andreas and Helmly, Stefan and Ohnmacht, Benjamin and Gazdzicki, Pawel and Gülzow, Erich and Hiesgen, Renate (2014) Influence of Platinum Deposits on Properties and Degradation of Nafion® Membranes. 97th Canadian Chemistry Conference and Exhibition, 02. Jun - 05. June 2014, Vancouver, Canada.

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Abstract

It is well known that platinum (Pt) from the electrodes is dissolved during operation of PEFC and can deposit in the electrolyte membrane. This deposition may alter membrane properties and induce degradation even though many aspects of the complex interactions are controversial. This contribution discusses the approach of artificial deposition of Pt to mimic this effect and compare the result to naturally aged membranes in PEFC. To systematically investigate this influence, we compared pristine membranes with membranes impregnated with different amounts of Pt in a degradation test. Specifically, this paper presents results regarding Pt particle distribution in the membrane, mass transport in the membrane as well as membrane decomposition. Our investigation revealed that particle size, not particle concentration, is the dominating parameter for the extent of membrane decomposition. In context with other studies, our data suggest that Pt concentration induces ionomer decomposition but its distribution is of paramount importance for the extent of membrane degradation.

Item URL in elib:https://elib.dlr.de/92091/
Document Type:Conference or Workshop Item (Speech)
Title:Influence of Platinum Deposits on Properties and Degradation of Nafion® Membranes
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Helmly, Stefanstefan.helmly (at) dlr.deUNSPECIFIED
Ohnmacht, Benjaminbenjamin.ohnmacht (at) dlr.deUNSPECIFIED
Gazdzicki, Pawelpawel.gazdzicki (at) dlr.deUNSPECIFIED
Gülzow, Ericherich.guelzow (at) dlr.deUNSPECIFIED
Hiesgen, Renaterenate.hiesgen (at) hs-esslingen.deUNSPECIFIED
Date:3 June 2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Platinum in membrane, polymer decomposition, durability
Event Title:97th Canadian Chemistry Conference and Exhibition
Event Location:Vancouver, Canada
Event Type:international Conference
Event Dates:02. Jun - 05. June 2014
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 - Electrochemical Processes (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:19 Nov 2014 15:23
Last Modified:19 Nov 2014 15:23

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