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Influence of the Distribution of Platinum Deposits on the Properties and Degradation of Platinum-Impregnated Nafion Membranes

Helmly, Stefan and Ohnmacht, Benjamin and Gazdzicki, Pawel and Hiesgen, Renate and Gülzow, Erich and Friedrich, K. Andreas (2014) Influence of the Distribution of Platinum Deposits on the Properties and Degradation of Platinum-Impregnated Nafion Membranes. Journal of The Electrochemical Society, 161 (14), F1416-F1426. Electrochemical Society, Inc.. doi: 10.1149/2.0531414jes. ISSN 0013-4651.

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In proton exchange membrane fuel cells (PEMFCs), platinum (Pt) from the electrodes can be deposited in the electrolyte membrane, altering its properties and causing degradation. To investigate these impacts, in some studies, membranes with artificially deposited Pt were used, however, with contradictory results. In this study, we compared membranes impregnated with 0 to 4.4 wt% Pt. Specifically, the Pt particle distribution and mass transport in the membrane as well as the membrane decomposition is investigated after performing open circuit durability tests for∼140 h. The properties of the membrane electrode assemblies (MEAs) are studied by electrochemical characterization. The changes upon degradation are investigated by thickness determination, infrared spectroscopy, fluoride emission, hydrogen permeability, and electrical conductivity. Our investigation confirmed that the particle density, not the Pt amount, is the determining factor in the extent of membrane decomposition: fluoride emission decreased exponentially with particle density. We further found a considerable difference in the particle distribution between artificial and in-situ Pt deposits. Moreover, properties of both membrane types changed contrary to each other during the durability test. In conclusion, Pt-impregnated membranes do not reflect the state of degraded membranes with in-situ formed deposits but are suitable to investigate the influence of particle distributions.

Item URL in elib:https://elib.dlr.de/92003/
Document Type:Article
Title:Influence of the Distribution of Platinum Deposits on the Properties and Degradation of Platinum-Impregnated Nafion Membranes
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Helmly, Stefanstefan.helmly (at) dlr.deUNSPECIFIED
Ohnmacht, Benjaminbenjamin.ohnmacht (at) dlr.deUNSPECIFIED
Gazdzicki, Pawelpawel.gazdzicki (at) dlr.deUNSPECIFIED
Hiesgen, Renaterenate.hiesgen (at) hs-esslingen.deUNSPECIFIED
Gülzow, Ericherich.guelzow (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Journal or Publication Title:Journal of The Electrochemical Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1149/2.0531414jes
Page Range:F1416-F1426
Publisher:Electrochemical Society, Inc.
Keywords:PEMFC Pt-Band Nafion
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: Helmly, Stefan
Deposited On:17 Nov 2014 16:34
Last Modified:08 Mar 2018 18:46

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