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Electrocatalyst Stability under Dynamic and Stationary Operation of Polymer Electrolyte Fuel Cells

Friedrich, K. Andreas and Helmly, Stefan and Ohnmacht, Benjamin and Gazdzicki, Pawel and Gülzow, Erich and Hiesgen, Renate (2014) Electrocatalyst Stability under Dynamic and Stationary Operation of Polymer Electrolyte Fuel Cells. CIMTEC Congress 2014, 15. - 19. Jun. 2014, Montecatini, Italien.

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Abstract

Durability and cost are two barriers recognized for the extensive application of proton exchange membrane (PEM) fuel cell as a promising clean energy technology. To date, considerable effort has been made to study the performance and component degradation via diverse methods and for accelerated degradation, routines have been developed. For instance, operation at open circuit voltage (OCV) is one of the most frequently employed high potential stressors for a PEM fuel cells leading to Pt electrocatalyst dissolution and membrane decomposition. Single cells as well as short stacks were aged under different operation conditions which are discussed in the literature to accelerate degradation of electrocatalyst and membranes. Numerous in-situ and ex-situ analysis is applied to understand the importance of different degradation mechanisms. A general conclusion from these measurement is that Pt dissolution plays an important – perhaps even the crucial – role for the loss of electrochemical surface area and membrane decomposition. To demonstrate this aspect, membranes were first impregnated with Pt ions which were reduced and the fluoride emission rate was measured.

Item URL in elib:https://elib.dlr.de/92095/
Document Type:Conference or Workshop Item (Speech)
Title:Electrocatalyst Stability under Dynamic and Stationary Operation of Polymer Electrolyte Fuel Cells
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:17 June 2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:durability, catalysts stability, polymer decomposition
Event Title:CIMTEC Congress 2014
Event Location:Montecatini, Italien
Event Type:international Conference
Event Dates:15. - 19. Jun. 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 15:24
Last Modified:19 Nov 2014 15:24

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