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Post Mortem Analysis of Degraded DMFC After Extended Operation

Gazdzicki, Pawel and Schulze, Mathias and Bresciani, Fausto and Casalegno, Andrea and Guétaz, Laure and Bonde, Jacob (2014) Post Mortem Analysis of Degraded DMFC After Extended Operation. 65th Annual Meeting of the International Society of Electrochemistry, 31. Aug. - 05. Sep. 2014, Lausanne, Schweiz.

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Abstract

This work presents an ex-situ analysis of long-term (>1000 h) aged DMFC. Specifically, the data comprise a comparison of pristine, activated and aged MEA components in order to assess the observed physical changes with respect to their impact on permanent performance loss. The components analyzed by means of X-ray photoelectron spectroscopy and electron microscopy are GDLs, MPLs, CLs and membranes. Our results clearly show that Ru cross-over from anode CL to cathode CL and MPL, associated with observation of catalyst precipitates in the membrane, occurs mainly at the beginning of the operation (first 30 h) and proceeds only slowly upon long term aging. Hence, this effect seems to represent a minor contribution to the overall performance loss. In the MPL and CL of the anode and the cathode side a loss of polymers is observed which occurs predominantly at the beginning of operation too. An effect attributed to long-time operation is the gradual chemical decomposition of PTFE (fluorine depletion) especially in the anodic GDL.

Item URL in elib:https://elib.dlr.de/90726/
Document Type:Conference or Workshop Item (Speech)
Title:Post Mortem Analysis of Degraded DMFC After Extended Operation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gazdzicki, Pawelpawel.gazdzicki (at) dlr.deUNSPECIFIED
Schulze, Mathiasmathias.schulze (at) dlr.deUNSPECIFIED
Bresciani, FaustoPolitecnico di MilanoUNSPECIFIED
Casalegno, AndreaPolitecnico di MilanoUNSPECIFIED
Guétaz, LaureCEA, DRT-LITEN-DEHT-LCPEMUNSPECIFIED
Bonde, JacobIRD Fuel Cells A/SUNSPECIFIED
Date:5 September 2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Fuel Cell, Degradation, Ex-situ, XPS, Catalyst Layer
Event Title:65th Annual Meeting of the International Society of Electrochemistry
Event Location:Lausanne, Schweiz
Event Type:international Conference
Event Dates:31. Aug. - 05. Sep. 2014
Organizer:International Society of Electrochemistry
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: Gazdzicki, Dr. Pawel
Deposited On:01 Oct 2014 09:31
Last Modified:01 Oct 2014 09:31

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