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Investigation of the degradation of different nickel anode types for alkaline fuel cells (AFC)

Gülzow, Erich and Schulze, Mathias and Steinhilber, Gudrun (2002) Investigation of the degradation of different nickel anode types for alkaline fuel cells (AFC). Journal of Power Sources (106), pp. 126-135. ISSN 0378-7753/02$.

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


Low temperature fuel cells have the opportunity of becoming important for mobile energy systems as, in contrast to other low temperature fuel cells, the alkaline type requires neither noble metal catalysts nor an expensive polymer electrolyte. In alkaline fuel cells (AFC) nickel is used as anode catalyst in gas diffusion electrodes. The metal catalyst was mixed with polytetraflourethylene (PTFE) as organic binder in a knife mile and rolled onto a metal web in a calandar to prepare the electrode. After an activation process with hydrogen evolution at 5 mA/cm2 for 18 h the electrodes were stressed at constant loading in a half cell equipment. During the fuel- cell operation the electrochemical performance decreased. dDue to changes of the polymer (PTFE) and of the metal particles in the electrode, which is described in detail in another paper. In this study three types of electrodes were investigated. The first type of electrode is composed of pure Raney-nickel and PTFE powder, the nickel particles in the second electrode type werewas selected according to particle size and in the third electrode copper powder was added to the nickel powder not selected by size. The size selected nickel particles shows a better electrochemical performance related to the non-selected catalyst, but due to the electrochemically induced disintegration of the nickel particles the electrochemical performance decreases stronger. The copper powder in the third electrode is added to improve the electronic conductivity of the nickel catalyst, but the copper is not stable under the electrochemical conditions in fuel cell operation. With all three anode types long-term experiments have been performed. The electrodes haves been characterized after the electrochemical stressing to investigate the degradation processes.

Item URL in elib:https://elib.dlr.de/45573/
Document Type:Article
Title:Investigation of the degradation of different nickel anode types for alkaline fuel cells (AFC)
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Journal or Publication Title:Journal of Power Sources
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 126-135
Keywords:AFC, Degradation, Ni anodes
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:05 Dec 2006
Last Modified:27 Apr 2009 13:15

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