elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Datenschutz | Kontakt | English
Schriftgröße: [-] Text [+]

Electrochemical Impedance Spectroscopy of Unitized Reversible Fuel Cells (URFC)

Altmann, Sebastian und Wagner, Norbert und Friedrich, K. Andreas (2009) Electrochemical Impedance Spectroscopy of Unitized Reversible Fuel Cells (URFC). International Workshop on Impedance Spectroscopy (IS 2009) , 2009-10-22 - 2009-10-23, Chemnitz, Deutschland.

[img] PDF
612kB

Kurzfassung

In mobile and portable applications electrical energy is normally supplied by secondary batteries since the use of electricity from stationary power plants required grid connection. Unfortunately the specific energy and the energy density of those energy storage systems are rather low. Therefore fuel cells are an interesting option to overcome the limitation of energy density. However fuel cells need a continuous supply with fuel and oxidant. At some special applications, like space crafts, autonomous long distance aircrafts or stand-alone power supplies, an external refuelling is not possible or feasible. In that case the reactants must be regenerated by water electrolysis and a reversible fuel cell system is needed. 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. Polarisation curves showing the differences in performance and long term stability of the membrane-electrode-assembly but can not give an overview about the activity of the catalysts. Also there are limited information’s about the behaviour of the electrodes under the different cell conditions. Therefore the impedance spectroscopy is necessary. While operating the same cell in electrolysis and fuel cell mode the impedance spectra of both shows the same elements. So for simulation the same equivalent circuit have to be used and the data are directly comparable to each other. The changing of the properties of anode, cathode and membrane through the operating mode can be shown.

elib-URL des Eintrags:https://elib.dlr.de/60626/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Electrochemical Impedance Spectroscopy of Unitized Reversible Fuel Cells (URFC)
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Altmann, Sebastiansebastian.altmann (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wagner, Norbertnorbert.wagner (at) dlr.dehttps://orcid.org/0000-0002-2596-8689NICHT SPEZIFIZIERT
Friedrich, K. Andreasandreas.friedrich (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:22 Oktober 2009
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Stichwörter:EIS, Impedance Spectroscopy, URFC, unitized regenerative fuel cell
Veranstaltungstitel:International Workshop on Impedance Spectroscopy (IS 2009)
Veranstaltungsort:Chemnitz, Deutschland
Veranstaltungsart:Workshop
Veranstaltungsbeginn:22 Oktober 2009
Veranstaltungsende:23 Oktober 2009
Veranstalter :Technische Universität Chemnitz
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 16:31
Letzte Änderung:24 Apr 2024 19:25

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
electronic library verwendet EPrints 3.3.12
Gestaltung Webseite und Datenbank: Copyright © Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.