1. ZHAW digitalcollection
  2. School of Engineering
  3. Publikationen
  4. Publikationen School of Engineering
Full metadata record
DC FieldValueLanguage
dc.contributor.authorHolzer, Lorenz-
dc.contributor.authorIwanschitz, Boris-
dc.contributor.authorHocker, Thomas-
dc.contributor.authorKeller, Lukas-
dc.contributor.authorPecho, Omar-
dc.contributor.authorSartoris, Guido-
dc.contributor.authorGasser, Philippe-
dc.contributor.authorMuench, Beat-
dc.date.accessioned2017-11-30T09:22:10Z-
dc.date.available2017-11-30T09:22:10Z-
dc.date.issued2013-
dc.identifier.issn0378-7753de_CH
dc.identifier.issn1873-2755de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/1619-
dc.description.abstractA methodology based on FIB-tomography and image analysis (IA) is proposed which allows quantification of all relevant morphological features that are necessary to predict effective transport properties in porous SOFC electrodes. These morphological Features are constrictivity, tortuosity, percolation factor and phase volume fraction. An M-factor can then be calculated which represents the ratio of effective over intrinsic conductivities. The methodology is used to describe effects of microstructure degradation in Ni-YSZ anodes which are caused by redox cycling at 950°C. The so calculated M-factors predict that because of redox cycling the effective electronic conductivity of nickel decreases from 3 to 1.2% which is mainly due to changes of percolation and constriction factors. Based on these results the effective electrical conductivity of nickel is predicted to be 685 S/cm before redox and 243 S/cm after 8 redox cycles. The predictions fit well with the experimental measurements that reveal 600 S/cm before and 200 S/cm after redox cycling at 950°C. For YSZ the M-factors obtained with 3D-analysis predict that the degradation causes a drop of the effective ionic conductivity from 7 to 0.6%, which is due to a change of the bottleneck dimensions. This finding contradicts the frequent interpretation of YSZ as a ‘rigid backbone’ that is not affected by microstructure degradation. Finally, the effective bulk gas diffusivity increases from 2 to 11% due to an increase of porosity associated with swelling of the anode.de_CH
dc.language.isoende_CH
dc.publisherElsevierde_CH
dc.relation.ispartofJournal of Power Sourcesde_CH
dc.rightsLicence according to publishing contractde_CH
dc.subjectMapde_CH
dc.subjectSOFCde_CH
dc.subject.ddc621.3: Elektro-, Kommunikations-, Steuerungs- und Regelungstechnikde_CH
dc.titleRedox cycling of Ni-YSZ anodes for solid oxide fuel cells: influence of tortuosity, constriction and percolation factors on the effective transport propertiesde_CH
dc.typeBeitrag in wissenschaftlicher Zeitschriftde_CH
dcterms.typeTextde_CH
zhaw.departementSchool of Engineeringde_CH
zhaw.organisationalunitInstitute of Computational Physics (ICP)de_CH
dc.identifier.doi10.1016/j.jpowsour.2013.05.047de_CH
zhaw.funding.euNode_CH
zhaw.originated.zhawYesde_CH
zhaw.pages.end194de_CH
zhaw.pages.start179de_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume242de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
Appears in collections:Publikationen School of Engineering

Files in This Item:
There are no files associated with this item.
Show simple item record
Holzer, L., Iwanschitz, B., Hocker, T., Keller, L., Pecho, O., Sartoris, G., Gasser, P., & Muench, B. (2013). Redox cycling of Ni-YSZ anodes for solid oxide fuel cells: influence of tortuosity, constriction and percolation factors on the effective transport properties. Journal of Power Sources, 242, 179–194. https://doi.org/10.1016/j.jpowsour.2013.05.047
Holzer, L. et al. (2013) ‘Redox cycling of Ni-YSZ anodes for solid oxide fuel cells: influence of tortuosity, constriction and percolation factors on the effective transport properties’, Journal of Power Sources, 242, pp. 179–194. Available at: https://doi.org/10.1016/j.jpowsour.2013.05.047.
L. Holzer et al., “Redox cycling of Ni-YSZ anodes for solid oxide fuel cells: influence of tortuosity, constriction and percolation factors on the effective transport properties,” Journal of Power Sources, vol. 242, pp. 179–194, 2013, doi: 10.1016/j.jpowsour.2013.05.047.
HOLZER, Lorenz, Boris IWANSCHITZ, Thomas HOCKER, Lukas KELLER, Omar PECHO, Guido SARTORIS, Philippe GASSER und Beat MUENCH, 2013. Redox cycling of Ni-YSZ anodes for solid oxide fuel cells: influence of tortuosity, constriction and percolation factors on the effective transport properties. Journal of Power Sources. 2013. Bd. 242, S. 179–194. DOI 10.1016/j.jpowsour.2013.05.047
Holzer, Lorenz, Boris Iwanschitz, Thomas Hocker, Lukas Keller, Omar Pecho, Guido Sartoris, Philippe Gasser, and Beat Muench. 2013. “Redox Cycling of Ni-YSZ Anodes for Solid Oxide Fuel Cells: Influence of Tortuosity, Constriction and Percolation Factors on the Effective Transport Properties.” Journal of Power Sources 242: 179–94. https://doi.org/10.1016/j.jpowsour.2013.05.047.
Holzer, Lorenz, et al. “Redox Cycling of Ni-YSZ Anodes for Solid Oxide Fuel Cells: Influence of Tortuosity, Constriction and Percolation Factors on the Effective Transport Properties.” Journal of Power Sources, vol. 242, 2013, pp. 179–94, https://doi.org/10.1016/j.jpowsour.2013.05.047.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.