Hiesgen, Renate and Wehl, Ines and Schulze, Mathias and Haug, Andrea and Friedrich, K. Andreas and Wang, Haijiang and Yuan, Xia-Zi (2011) Degradation of Fuel Cell Materials Investigated by Atomic Force Microscopy. In: Proceedigs memory stick. European Fuel Cell Forum 2011, 2011-06-28 - 2011-07-01, Luzern, Schweiz.
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Abstract
In this contribution the ability of atomic force microscopy (AFM) for investigation of fuel cell components and determination of their degradation is demonstrated. In particular the mapping of adhesion force and dissipation energy of surfaces analyzed by an advanced material sensitive AFM technique - the HarmoniX™-mode (Bruker Corp.) - has been used as a measure for the relative polytetrafluoroethylene (PTFE) content of surfaces. Differently operated microporous layers (MPL) of commercial gas diffusion layers (GDL) have been investigated before and after operation and were compared to reference samples. The degradation of the cathode material compared to the anode was found to be higher. Another example for exploring the potential of AFM is the investigation of a cell with a segmented anode flow field. The relative change of surface properties at MPLs detected with AFM analysis was compared to the direct measurement of PTFE content by infrared spectroscopy (FTIR-ATR) and a good correlation of both results has been found for the analyzed segments. The ionically conductive structure of electrolyte membranes has also been investigated by conductive AFM in humid environment. High resolution images show an heterogeneous conductivity with non-conductive regions even after fuel cell operation. Sharply defined areas with same mean magnitude of current at the surface indicate the presence of an interpenetrating network of ionic channels connected beneath the surface. A correlation with surface properties measured by the PeakForce Quantitative Nanomechanical Property Mapping (QNM™) is observed.
Item URL in elib: | https://elib.dlr.de/71422/ | ||||||||||||||||||||||||||||||||
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Document Type: | Conference or Workshop Item (Speech) | ||||||||||||||||||||||||||||||||
Title: | Degradation of Fuel Cell Materials Investigated by Atomic Force Microscopy | ||||||||||||||||||||||||||||||||
Authors: |
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Date: | July 2011 | ||||||||||||||||||||||||||||||||
Journal or Publication Title: | Proceedigs memory stick | ||||||||||||||||||||||||||||||||
Open Access: | No | ||||||||||||||||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||||||||||||||||
In SCOPUS: | No | ||||||||||||||||||||||||||||||||
In ISI Web of Science: | No | ||||||||||||||||||||||||||||||||
Editors: |
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Status: | Published | ||||||||||||||||||||||||||||||||
Keywords: | fuel cell membrane and electrode degradation | ||||||||||||||||||||||||||||||||
Event Title: | European Fuel Cell Forum 2011 | ||||||||||||||||||||||||||||||||
Event Location: | Luzern, Schweiz | ||||||||||||||||||||||||||||||||
Event Type: | international Conference | ||||||||||||||||||||||||||||||||
Event Start Date: | 28 June 2011 | ||||||||||||||||||||||||||||||||
Event End Date: | 1 July 2011 | ||||||||||||||||||||||||||||||||
Organizer: | Fuel Cell Forum | ||||||||||||||||||||||||||||||||
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 10:51 | ||||||||||||||||||||||||||||||||
Last Modified: | 24 Apr 2024 19:37 |
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