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Development of Bifunctional Electrodes for Closed-loop Fuel Cell Applications

Altmann, Sebastian und Kaz, Till und Friedrich, K. Andreas (2009) Development of Bifunctional Electrodes for Closed-loop Fuel Cell Applications. In: ECS Transactions Vol. 25 Proton Exchange Membrane Fuel Cells 9, Vol. 2. The Electrochemical Society. 216th ECS Meeting, 04.-09. Okt. 2009, Wien, Österreich.

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Kurzfassung

Unitized regenerative fuel cells (URFC) in combination with photovoltaic modules are attractive for space missions because they enable extended operation times and low weight. During the planetary day, electrical energy is stored which can be converted into electricity by the fuel cell during the night. All air-independent applications such as spacecraft or space stations would profit signifycantly from such energy conversion devices. A unitized regenerative fuel cell is a combined energy conversion and storage system based on H2 and O2 which combines the advantages of fuel cells and secondary batteries. Substantial advantages of the specific energy density can be expected from the use of a URFC (400- 1000 Wh/kg) in comparison to secondary batteries (220- 250 Wh/kg for future advanced Li-polymer batteries). An important topic is the function of so-called bifunctional oxygen electrodes which generally require the combination of favourable properties for both operating modes. In particular, different catalysts for oxygen reduction and for oxygen evolution are needed. This contribution investigates various electrode designs with Pt and IrO2 catalysts. For that purpose, the DLR dry spraying technique for the manufacturing of electrodes is applied for by mixing the two different catalysts together (Pt and IrO2) or applying the catalyst on different areas of electrode or even realising different layers with both catalysts. The different options are explained in Fig. 1. Of interest was to compare the simple mixing of the catalysts (option 1), the layered electrode with two compositions (option 2) and the segmented approach with dedicated areas with just one catalyst (option 3).

elib-URL des Eintrags:https://elib.dlr.de/60635/
Dokumentart:Konferenzbeitrag (Paper)
Titel:Development of Bifunctional Electrodes for Closed-loop Fuel Cell Applications
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Altmann, Sebastiansebastian.altmann (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Kaz, Tilltk (at) between.euNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Friedrich, K. Andreasandreas.friedrich (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:7 Oktober 2009
Erschienen in:ECS Transactions Vol. 25 Proton Exchange Membrane Fuel Cells 9
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Band:Vol. 2
Verlag:The Electrochemical Society
Name der Reihe:ECS Transactions
Status:veröffentlicht
Stichwörter:URFC, unitized reversible fuel cell, electrolysis
Veranstaltungstitel:216th ECS Meeting
Veranstaltungsort:Wien, Österreich
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:04.-09. Okt. 2009
Veranstalter :The Electrochemical Society
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: Altmann, Sebastian
Hinterlegt am:09 Nov 2009 16:24
Letzte Änderung:31 Jul 2019 19:25

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