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Understanding the Resistances and Voltage Losses of SOFC Stacks

Lang, Michael and Auer, Corinna and Henke, Moritz and Hauler, Felix (2015) Understanding the Resistances and Voltage Losses of SOFC Stacks. ECS Conference on Electrochemical Energy Conversion & Storage with SOFC-XIV, 26. - 31.07.2015, Glasgow, Schottland.

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Abstract

In the past much effort was spent for the detailed understanding of the electrochemical behavior of SOFC single cells. However, these results can only hardly be transferred to the SOFC stack technology because of huge differences in fuel utilization, in temperature distribution, in gas flow design and in electrical current load. Therefore, proper and detailed understanding of the electrochemical behavior of the SOFC stacks is obligatory for the successful introduction and acceptance of the SOFC technology into the global energy market. The paper presents both experimental and modeling results of the electrochemical behavior of SOFC short stacks with anode supported cells (ASC) in the cassette design at different operating conditions. The focus lies on the investigation of the different resistances and the voltage losses in the stack layers, which can be classified in ohmic, electrode polarization and gas concentration ones. The influence of the different operation conditions, e.g. temperature, current density and fuel utilization is outlined. The stacks were investigated by current-voltage curves, electrochemical impedance spectroscopy (EIS), gas analysis and long term measurements. Results of both integral and locally resolved measurements along the fuel gas flow path are presented. The modeling results were obtained with a two dimensional elementary kinetic model which represents a single cell along the gas channels and through the thickness of the membrane-electrode assembly.

Item URL in elib:https://elib.dlr.de/99368/
Document Type:Conference or Workshop Item (Poster)
Title:Understanding the Resistances and Voltage Losses of SOFC Stacks
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lang, MichaelMichael.Lang (at) dlr.deUNSPECIFIED
Auer, Corinnacorinna.auer (at) dlr.deUNSPECIFIED
Henke, Moritzmoritz.henke (at) dlr.deUNSPECIFIED
Hauler, FelixElringKlinger AGUNSPECIFIED
Date:July 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:SOFC, ASC, EIS, electrochemical behavior, stack, experimental results, modeling, ohmic resistance, electrode polarization, gas concentration, voltage losses
Event Title:ECS Conference on Electrochemical Energy Conversion & Storage with SOFC-XIV
Event Location:Glasgow, Schottland
Event Type:international Conference
Event Dates:26. - 31.07.2015
Organizer:The Electrochemical Society
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Fuel Cells (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Bohn, Corinna
Deposited On:17 Nov 2015 08:44
Last Modified:17 Nov 2015 08:44

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