20.500.12556/RUL-126389 Sensitivity based order reduction of a chemical membrane degradation model for low-temperature proton exchange membrane fuel cells 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. fuel cell chemical membrane degradation perfluorinated sulfonic acid membrane reactive oxygen species modeling sensitivity analysis PEMFC gorivna celica PEMFC kemijsko staranje membrane membrana s perfluorirano sulfonsko kislino reaktivne kisikove spojine modeliranje občutljivostna analiza true false true Angleški jezik Slovenski jezik Članek v reviji 2021-04-19 23:07:37 2021-04-19 23:07:42 2022-09-05 03:55:02 0000-00-00 00:00:00 2020 0 0 15 str. iss. 21, art. 5611 Vol. 13 Nov. 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 519.8:621.352.6(045) 1996-1073 10.3390/en13215611 34573571 518046745 RAZ_Kregar_Ambroz_2020.pdf RAZ_Kregar_Ambroz_2020.pdf 1 FF0E4A1BAB2B2BE2E645AF54E75770BA 9e975d976de18e5303ca5cfb8e6286cefcda92881f53c62d493bc8f131fdaf45 447884d5-802e-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=153360 https://www.mdpi.com/1996-1073/13/21/5611 1 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=142328 Fakulteta za strojništvo 0 0 0