Microstructural finite element modeling of redox behavior of Ni-YSZ based ceramic SOFC anodes

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dc.contributor.authorToros, Serkan
dc.date.accessioned2019-08-01T13:38:39Z
dc.date.available2019-08-01T13:38:39Z
dc.date.issued2016
dc.departmentNiğde ÖHÜ
dc.description.abstractOne of the main challenges in solid oxide fuel cell (SOFC) is the redox problem of Ni-based anodes. Therefore, the redox tolerance of the anode should be improved to increase the service life of the system. Since the real SOFC anodes have a heterogeneous structure with different grain sizes, a micro-level modeling is necessary. Especially, the re-oxidation step which creates large amount of stress is critical during the redox cycles. Therefore, in this study, the effects of re-oxidation temperatures and exposure times on the oxidation rate and stresses developed are investigated on a synthetically generated porous anode functional layer microstructure. A mathematical model is developed to characterize the re-oxidation process and solved numerically. The results indicate that the re-oxidation strongly depends on the re-oxidation temperature and exposure time. The time required for the full oxidation is found to be 7458.55, 313.14, 200.8 and 33.78 s at 800, 850, 900 and 950 degrees C, respectively for the generated anode microstructure. In addition, the created stresses in the anode structure are well above the critical material limits. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
dc.identifier.doi10.1016/j.ceramint.2016.02.148
dc.identifier.endpage8924
dc.identifier.issn0272-8842
dc.identifier.issn1873-3956
dc.identifier.issue7
dc.identifier.scopus2-s2.0-84977744763
dc.identifier.scopusqualityQ1
dc.identifier.startpage8915
dc.identifier.urihttps://dx.doi.org/10.1016/j.ceramint.2016.02.148
dc.identifier.urihttps://hdl.handle.net/11480/3651
dc.identifier.volume42
dc.identifier.wosWOS:000374075300140
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthorToros, Serkan
dc.language.isoen
dc.publisherELSEVIER SCI LTD
dc.relation.ispartofCERAMICS INTERNATIONAL
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectSynthetic SOFC anode microstructure
dc.subjectRe-oxidation
dc.subjectFEM
dc.titleMicrostructural finite element modeling of redox behavior of Ni-YSZ based ceramic SOFC anodes
dc.typeArticle

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