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Sensitivity based order reduction of a chemical membrane degradation model for low-temperature proton exchange membrane fuel cells
ID Kregar, Ambrož (Author), ID Frühwirt, Philipp (Author), ID Ritzberger, Daniel (Author), ID Jakubek, Stefan (Author), ID Katrašnik, Tomaž (Author), ID Gescheidt, Georg (Author)

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Abstract
The chemical degradation of the perfluorinated sulfonic acid (PFSA) ion-exchange membrane as a result of an attack from a radical species, originating as a by-product of the oxygen reduction reaction, represents a significant limiting factor in a wider adoption of low-temperature proton exchange membrane fuel cells (LT-PEMFCs). The efficient mathematical modeling of these processes is therefore a crucial step in the further development of proton exchange membrane fuel cells. Starting with an extensive kinetic modeling framework, describing the whole range of chemical processes leading to the membrane degradation, we use the mathematical method of sensitivity analysis to systematically reduce the number of both chemical species and reactions needed to efficiently and accurately describe the chemical degradation of the membrane. The analysis suggests the elimination of chemical reactions among the radical species, which is supported by the physicochemical consideration of the modeled reactions, while the degradation of Nafion backbone can be significantly simplified by lumping several individual species concentrations. The resulting reduced model features only 12 species coupled by 8 chemical reactions, compared to 19 species coupled by 23 reactions in the original model. The time complexity of the model, analyzed on the basis of its stiffness, however, is not significantly improved in the process. Nevertheless, the significant reduction in the model system size and number of parameters represents an important step in the development of a computationally efficient coupled model of various fuel cell degradation processes. Additionally, the demonstrated application of sensitivity analysis method shows a great potential for further use in the optimization of models of operation and degradation of fuel cell components.

Language:English
Keywords:fuel cell, chemical membrane degradation, perfluorinated sulfonic acid membrane, reactive oxygen species, modeling, sensitivity analysis, PEMFC
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2020
Number of pages:15 str.
Numbering:Vol. 13, iss. 21, art. 5611
PID:20.500.12556/RUL-126389 This link opens in a new window
UDC:519.8:621.352.6(045)
ISSN on article:1996-1073
DOI:10.3390/en13215611 This link opens in a new window
COBISS.SI-ID:34573571 This link opens in a new window
Publication date in RUL:19.04.2021
Views:776
Downloads:174
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Record is a part of a journal

Title:Energies
Shortened title:Energies
Publisher:Molecular Diversity Preservation International
ISSN:1996-1073
COBISS.SI-ID:518046745 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:01.11.2020

Secondary language

Language:Slovenian
Keywords:gorivna celica, PEMFC, kemijsko staranje membrane, membrana s perfluorirano sulfonsko kislino, reaktivne kisikove spojine, modeliranje, občutljivostna analiza

Projects

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:P2-0401
Name:Energetsko strojništvo

Funder:Drugi - Drug financer ali več financerjev
Funding programme:Austrian Research Promotion Agency
Project number:854867
Acronym:SoH4PEM

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