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

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

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

Kurzfassung

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.

elib-URL des Eintrags:https://elib.dlr.de/45573/
Dokumentart:Zeitschriftenbeitrag
Titel:Investigation of the degradation of different nickel anode types for alkaline fuel cells (AFC)
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Gülzow, ErichNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schulze, MathiasNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Steinhilber, GudrunNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2002
Erschienen in:Journal of Power Sources
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Ja
Seitenbereich:Seiten 126-135
ISSN:0378-7753/02$
Status:veröffentlicht
Stichwörter:AFC, Degradation, Ni anodes
HGF - Forschungsbereich:Energie
HGF - Programm:Rationelle Energieumwandlung (alt)
HGF - Programmthema:E BZ - Brennstoffzellen (alt)
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E BZ - Brennstoffzellen
DLR - Teilgebiet (Projekt, Vorhaben):E - Membran-Brennstoffzellen (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Elektrochemische Energietechnik
Hinterlegt von: Schulze, Dr.rer.nat. Mathias
Hinterlegt am:05 Dez 2006
Letzte Änderung:27 Apr 2009 13:15

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