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CO2 TOLERANCE AND DEGRADATION OF AFC ELECTRODES

Gülzow, Erich and Schulze, Mathias (2004) CO2 TOLERANCE AND DEGRADATION OF AFC ELECTRODES. In: First European Workshop on AFC (EWAFC). First European Workshop on AFC (EWAFC), 2004-11-15 - 2004-11-16, Stuttgart, Germany.

Full text not available from this repository.

Abstract

Alkaline fuel cells may become an important element in pollution free energy conversion. In the literature most papers in the field of low temperature fuel cells are concerned with polymer electrolyte fuel cells. However, there are still a lot of research groups and companies working on alkaline fuel cells. The advantages and disadvantages of AFC are presented. The DLR procedure for CO2 tolerant rolled gas diffusion electrodes are shown and the carried out degradation experiments. The used electrodes are examined with porosity, surface analyze measurement and electrochemical investigation methods. Investigation on CO2 poisoning shows the advantages of new rolled AFC electrodes. There is no significant degradation effect on CO2 within the first 3500 hours of operation with 150 times elevated concentration of carbon dioxide. The investigation of degradation mechanisms on these electrode shows that the mechanisms are known. Two different degradation mechanisms are observed: the first depends on charge transfer and the second on time of operation. Investigation using XPS measurements show a decomposition of PTFE during long term operation. The lifetime is over 5000 hours and comparable with life times of PEFC electrodes. It can be concluded, due to the work at DLR, that carbon dioxide poisoning of electrodes from rolled DLR electrodes does not take place. These investigations demonstrate that AFCs are highly efficient cells for portable and stationary applications.

Item URL in elib:https://elib.dlr.de/45555/
Document Type:Conference or Workshop Item (Speech)
Title:CO2 TOLERANCE AND DEGRADATION OF AFC ELECTRODES
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gülzow, ErichUNSPECIFIEDUNSPECIFIED
Schulze, MathiasUNSPECIFIEDUNSPECIFIED
Date:15 November 2004
Journal or Publication Title:First European Workshop on AFC (EWAFC)
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:AFC, CO2-tolerance
Event Title:First European Workshop on AFC (EWAFC)
Event Location:Stuttgart, Germany
Event Type:international Conference
Event Dates:2004-11-15 - 2004-11-16
Organizer:Deutsches Zentrum für Luft- und Raumfahrt e.V., Erich Gülzow
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E BZ - Fuel cells (old)
DLR - Research area:Energy
DLR - Program:E BZ - Fuel cells
DLR - Research theme (Project):E - Membran-Brennstoffzellen (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Schulze, Dr.rer.nat. Mathias
Deposited On:12 Dec 2006
Last Modified:27 Apr 2009 13:15

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