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A model-based approach for current voltage analyses to quantify degradation and fuel distribution in solid oxide fuel cell stacks

Linder, Markus and Hocker, Thomas and Meier, Christoph and Holzer, Lorenz and Friedrich, K. Andreas and Iwanschitz, Boris and Mai, Andreas and Schuler, J. Andreas (2015) A model-based approach for current voltage analyses to quantify degradation and fuel distribution in solid oxide fuel cell stacks. Journal of Power Sources, 288, pp. 409-418. Elsevier. DOI: 10.1016/j.jpowsour.2015.04.136 ISSN 0378-7753

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Official URL: http://www.journals.elsevier.com/journal-of-power-sources/


Reliable quantification and thorough interpretation of the degradation of solid oxide fuel cell (SOFC) stacks under real conditions is critical for the improvement of its long-term stability. The degradation behavior is often analyzed based on the evolution of currentevoltage (V,I) curves. However, these overall resistances often contain unavoidable fluctuations in the fuel gas amount and composition and hence are difficult to interpret. Studying the evolution of internal repeat unit (RU) resistances is a more appropriate measure to assess stack degradation. RU-resistances follow from EIS-data through subtraction of the gas concentration impedance from the overall steady-state resistance. In this work a model-based approach where a local equilibrium model is used for spatial discretization of a SOFC stack RU running on hydrocarbon mixtures such as natural gas. Since under stack operation, fuel leakages, uneven fuel distribution and varying natural gas composition can influence the performance, they are taken into account by the model. The model extracts the time-dependent internal resistance from (V,I)-data and local species concentration without any fitting parameters. RU resistances can be compared with the sum of the resistances of different components that allows one to make links between laboratory degradation experiments and the behavior of SOFC stacks during operation.

Item URL in elib:https://elib.dlr.de/99164/
Document Type:Article
Title:A model-based approach for current voltage analyses to quantify degradation and fuel distribution in solid oxide fuel cell stacks
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Linder, MarkusZHAW Zurich University of Appl. SciencesUNSPECIFIED
Hocker, ThomasHexis AGUNSPECIFIED
Meier, ChristophZHAW Zurich University of Appl. SciencesUNSPECIFIED
Holzer, LorenzHexis AGUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Iwanschitz, BorisHexis AGUNSPECIFIED
Schuler, J. AndreasHexis AGUNSPECIFIED
Journal or Publication Title:Journal of Power Sources
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.jpowsour.2015.04.136
Page Range:pp. 409-418
Keywords:Solid oxide fuel cell (SOFC) Current voltage characteristic Stack degradation Fuel distribution Hydrocarbon fuels Local thermodynamic equilibrium
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: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:09 Dec 2015 09:41
Last Modified:31 Jul 2019 19:56

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