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Development of Bifunctional Electrodes for Closed-loop Fuel Cell Applications

Altmann, Sebastian and Kaz, Till and Friedrich, K. Andreas (2010) Development of Bifunctional Electrodes for Closed-loop Fuel Cell Applications. Electrochemistry 2010: From Microscopic Understanding to Global Impact, 13.-15. Sept. 2010, Bochum, Deutschland.

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Abstract

Development of bifunctional Electrodes for closed-loop Fuel Cell Applications Altmann, S., Stuttgart/D, Kaz, T., Stuttgart/D, Friedrich, K. A., Stuttgart/D Sebastian Altmann, Institute of Technical Thermodynamics, German Aerospace Center, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany 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 significantly from such energy conversion devices. A unitized regenerative fuel cell is a combined energy con¬version 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 bifunc¬tional 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. In summary, the performances observed in the bifunc¬tional electrodes are quite promising for a URFC. The different configurations open up a wide field for optimi¬zing cell performance, durability and system performance.

Item URL in elib:https://elib.dlr.de/66471/
Document Type:Conference or Workshop Item (Speech)
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:2010
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:unitized regenerative fuel cell, bifunctional electrodes, electrolysis, URFC
Event Title:Electrochemistry 2010: From Microscopic Understanding to Global Impact
Event Location:Bochum, Deutschland
Event Type:international Conference
Event Dates:13.-15. Sept. 2010
Organizer:Gesellschaft Deutscher Chemiker e.V. (GDCh)
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:22 Nov 2010 16:41
Last Modified:31 Jul 2019 19:29

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