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PREPARATION OF GAS DIFFUSION ELECTRODES WITH SILVER CATALYSTS FOR ALKALINE FUEL CELLS

Gülzow, Erich und Wagner, Norbert und Schulze, Mathias (2004) PREPARATION OF GAS DIFFUSION ELECTRODES WITH SILVER CATALYSTS FOR ALKALINE FUEL CELLS. In: First European Workshop on AFC (EWAFC). First European Workshop on AFC (EWAFC), 2004-11-15 - 2004-11-16, Stuttgart, Germany.

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Kurzfassung

Alkaline 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 expensive noble metal catalysts nor an expensive polymer electrolyte [1]. In alkaline fuel cells (AFC) silver can be used as cathode catalyst in gas diffusion electrodes. The metal catalyst was mixed with polytetraflourethylene (PTFE) as organic binder in a knife mill and rolled onto a metal web in a calandar to prepare the gas diffusion electrodes. The electrodes are manufactured as an endless tape with a thickness of approx. 0.4 mm and widths up to 20 cm. As catalyst Raney-silver, carbon supported silver or silver deposited as a closed film on PTFE are used. The silver catalyst is frequently used in an oxidized form. In the preparation process of the gas diffusion electrodes the silver catalyst can be used in this oxidized form. Before using the gas diffusion silver cathodes in the alkaline fuel cell the catalyst will be reduced to the metallic form. The silver oxide in the gas diffusion electrodes is reduced galvanostatically at approx. 7 mA/cm2 with measurement of the potential. The reduction process is finished if the electrode potential is in the region of the hydrogen generation potential. In the chrono-potential curves the oxide states of silver yield a plateau; from the integration of the charging current the silver loading in the electrodes can be calculated. During the reduction process the dark electrodes turn bright. The electrodes are characterized electrochemically in half cells and physical by x-ray photoelectron spectroscopy (XPS). With V-i-curves the electrochemical performance is investigated. The XP spectra give information about the chemical composition of the electrodes. By successive measurements of XP spectra and ion etching of the surface depth profiles are recorded.

elib-URL des Eintrags:https://elib.dlr.de/45556/
Dokumentart:Konferenzbeitrag (Poster)
Titel:PREPARATION OF GAS DIFFUSION ELECTRODES WITH SILVER CATALYSTS FOR ALKALINE FUEL CELLS
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Gülzow, ErichNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wagner, NorbertNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schulze, MathiasNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:November 2004
Erschienen in:First European Workshop on AFC (EWAFC)
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:AFC, electrode preparation
Veranstaltungstitel:First European Workshop on AFC (EWAFC)
Veranstaltungsort:Stuttgart, Germany
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2004-11-15 - 2004-11-16
Veranstalter :Deutsches Zentrum für Luft- und Raumfahrt e.V., Erich Gülzow
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:12 Dez 2006
Letzte Änderung:27 Apr 2009 13:15

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