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Electrochemical Impedance Spectroscopy of Unitized Reversible Fuel Cells (URFC)

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

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Abstract

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.

Item URL in elib:https://elib.dlr.de/60626/
Document Type:Conference or Workshop Item (Speech)
Title:Electrochemical Impedance Spectroscopy of Unitized Reversible Fuel Cells (URFC)
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Altmann, Sebastiansebastian.altmann (at) dlr.deUNSPECIFIED
Wagner, Norbertnorbert.wagner (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:22 October 2009
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Keywords:EIS, Impedance Spectroscopy, URFC, unitized regenerative fuel cell
Event Title:International Workshop on Impedance Spectroscopy (IS 2009)
Event Location:Chemnitz, Deutschland
Event Type:Workshop
Event Dates:22.-23. Okt. 2009
Organizer:Technische Universität Chemnitz
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 16:31
Last Modified:31 Jul 2019 19:25

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