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Development of Bifunctional Electrodes for Closed-loop Fuel Cell Applications

Altmann, Sebastian and Kaz, Till and 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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Abstract

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).

Item URL in elib:https://elib.dlr.de/60635/
Document Type:Conference or Workshop Item (Paper)
Title:Development of Bifunctional Electrodes for Closed-loop Fuel Cell Applications
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Altmann, Sebastiansebastian.altmann (at) dlr.deUNSPECIFIED
Kaz, Tilltk (at) between.euUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:7 October 2009
Journal or Publication Title:ECS Transactions Vol. 25 Proton Exchange Membrane Fuel Cells 9
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:Vol. 2
Publisher:The Electrochemical Society
Series Name:ECS Transactions
Status:Published
Keywords:URFC, unitized reversible fuel cell, electrolysis
Event Title:216th ECS Meeting
Event Location:Wien, Österreich
Event Type:international Conference
Event Dates:04.-09. Okt. 2009
Organizer:The Electrochemical Society
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: Altmann, Sebastian
Deposited On:09 Nov 2009 16:24
Last Modified:31 Jul 2019 19:25

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