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

Linder, Markus; Hocker, Thomas; Meier, Christoph; Holzer, Lorenz; Friedrich, Andreas; Iwanschitz, Boris; Mai, Andreas; Schuler, Andreas J.

doi:10.1016/j.jpowsour.2015.04.136

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	A model-based approach for current voltage analyses to quantify degradation and fuel distribution in solid oxide fuel cell stacks
Authors:	Linder, Markus Hocker, Thomas Meier, Christoph Holzer, Lorenz Friedrich, Andreas Iwanschitz, Boris Mai, Andreas Schuler, Andreas J.
DOI:	10.1016/j.jpowsour.2015.04.136
Published in:	Journal of Power Sources
Volume(Issue):	288
Page(s):	409
Pages to:	418
Issue Date:	15-Aug-2015
Publisher / Ed. Institution:	Elsevier
ISSN:	0378-7753 1873-2755
Language:	English
Subjects:	Degradation; Map; Stack; SOFC
Subject (DDC):	621.3: Electrical, communications, control engineering
Abstract:	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 current–voltage (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.
URI:	https://digitalcollection.zhaw.ch/handle/11475/1631
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Engineering
Organisational Unit:	Institute of Computational Physics (ICP)
Appears in collections:	Publikationen School of Engineering

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Linder, M., Hocker, T., Meier, C., Holzer, L., Friedrich, A., Iwanschitz, B., Mai, A., & Schuler, A. J. (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, 409–418. https://doi.org/10.1016/j.jpowsour.2015.04.136

Linder, M. et al. (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. Available at: https://doi.org/10.1016/j.jpowsour.2015.04.136.

M. Linder et al., “A model-based approach for current voltage analyses to quantify degradation and fuel distribution in solid oxide fuel cell stacks,” Journal of Power Sources, vol. 288, pp. 409–418, Aug. 2015, doi: 10.1016/j.jpowsour.2015.04.136.

LINDER, Markus, Thomas HOCKER, Christoph MEIER, Lorenz HOLZER, Andreas FRIEDRICH, Boris IWANSCHITZ, Andreas MAI und Andreas J. SCHULER, 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. 15 August 2015. Bd. 288, S. 409–418. DOI 10.1016/j.jpowsour.2015.04.136

Linder, Markus, Thomas Hocker, Christoph Meier, Lorenz Holzer, Andreas Friedrich, Boris Iwanschitz, Andreas Mai, and Andreas J. Schuler. 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 (August): 409–18. https://doi.org/10.1016/j.jpowsour.2015.04.136.

Linder, Markus, et al. “A Model-Based Approach for Current Voltage Analyses to Quantify Degradation and Fuel Distribution in Solid Oxide Fuel Cell Stacks.” Journal of Power Sources, vol. 288, Aug. 2015, pp. 409–18, https://doi.org/10.1016/j.jpowsour.2015.04.136.