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Atomic force microscopy and infrared analysis of aging processes of polymer electrolyte membrane fuel cell components

Hiesgen, Renate and Wehl, Ines and Helmly, Stefan and Haug, Andrea and Schulze, Mathias and Bauder, Alexander and Wang, Haijiang and Yuan, Xiao-Zi and Friedrich, K. Andreas (2011) Atomic force microscopy and infrared analysis of aging processes of polymer electrolyte membrane fuel cell components. Journal of Electroanalytical Chemistry, 662, pp. 240-250. Elsevier. DOI: 10.1016/j.jelechem.2011.07.014

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Official URL: http://www.elsevier.com/locate/jelechem

Abstract

In this contribution, the possibilities and limits of atomic force microscopy (AFM) for investigation of fuel cell component degradation are evaluated. In particular the adhesion force and dissipation energy of the surface measured by a material sensitive AFM technique – the HarmoniX-mode (Bruker Corp.) – have been used as a measure for the relative polytetrafluoroethylene (PTFE) content of surfaces and could be quantified by calibrating with sample of known composition. Differently operated samples with microporous layers (MPLs) of commercial gas diffusion layers (GDLs) were investigated before and after operation and were compared to artificially aged and reference samples. A larger degradation of the cathode material compared to the anode was always found. As an additional example for the potential of AFM and infrared absorption spectroscopy (FTIR-ATR) the local PTFE content of a cell with a segmented anode flow field has been investigated. The results of PTFE loss at MPL and electrode surfaces from AFM measurements and infrared spectroscopy delivered different results which were explained by the distinct information depth of both methods. The large relative differences of PTFE content of the different segments were correlated with the mechanical properties of the special design of the segmented cell.

Item URL in elib:https://elib.dlr.de/71410/
Document Type:Article
Title:Atomic force microscopy and infrared analysis of aging processes of polymer electrolyte membrane fuel cell components
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hiesgen, Renaterenate.hiesgen (at) hs-esslingen.deUNSPECIFIED
Wehl, Inesines.wehl (at) hs-esslingen.deUNSPECIFIED
Helmly, Stefanstefan.helmly (at) dlr.deUNSPECIFIED
Haug, Andreaandrea.haug (at) dlr.deUNSPECIFIED
Schulze, Mathiasmathias.schulze (at) dlr.deUNSPECIFIED
Bauder, Alexanderaleander.bauder (at) dlr.deUNSPECIFIED
Wang, HaijiangInstitute for Fuel Cell Innovation, National Research Council CanadaUNSPECIFIED
Yuan, Xiao-ZiInstitute for Fuel Cell Innovation, National Research Council CanadaUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:October 2011
Journal or Publication Title:Journal of Electroanalytical Chemistry
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:662
DOI :10.1016/j.jelechem.2011.07.014
Page Range:pp. 240-250
Publisher:Elsevier
Status:Published
Keywords:fuel cell components; ageing
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E EV - Energy process technology (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Elektrochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:08 Nov 2011 11:05
Last Modified:27 Feb 2015 16:09

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