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, 2009-10-04 - 2009-10-09, 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/ | ||||||||||||||||
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Document Type: | Conference or Workshop Item (Paper) | ||||||||||||||||
Title: | Development of Bifunctional Electrodes for Closed-loop Fuel Cell Applications | ||||||||||||||||
Authors: |
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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 Start Date: | 4 October 2009 | ||||||||||||||||
Event End Date: | 9 October 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: | 24 Apr 2024 19:25 |
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