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Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-1568
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dc.contributor.authorHolzer, Lorenz-
dc.contributor.authorWiedenmann, Daniel-
dc.contributor.authorMünch, Beat-
dc.contributor.authorKeller, Lukas-
dc.contributor.authorPrestat, Michel-
dc.contributor.authorGasser, Philippe-
dc.contributor.authorRobertson, Iain-
dc.contributor.authorGrobéty, Bernard-
dc.date.accessioned2018-01-18T11:04:07Z-
dc.date.available2018-01-18T11:04:07Z-
dc.date.issued2013-
dc.identifier.issn0022-2461de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/2124-
dc.description.abstractThe aim of the present investigation is to define microstructure parameters, which control the effective transport properties in porous materials for energy technology. Recent improvements in 3D-imaging (FIB-nanotomography, synchrotron X-ray tomography) and image analysis (skeletonization and graph analysis, transport simulations) open new possibilities for the study of microstructure effects. In this study, we describe novel procedures for a quantitative analysis of constrictivity, which characterizes the so-called bottleneck effect. In a first experimental part, methodological tests are performed using a porous (La,Sr)CoO3 material (SOFC cathode). The tests indicate that the proposed procedure for quantitative analysis of constrictivity gives reproducible results even for samples with inhomogeneous microstructures (cracks, gradient of porosity). In the second part, 3D analyses are combined with measurements of ionic conductivity by impedance spectroscopy. The investigations are preformed on membranes of electrolysis cells with porosities between 0.27 and 0.8. Surprisingly, the tortuosities remain nearly constant (1.6) for the entire range of porosity. In contrast, the constrictivities vary strongly and correlate well with the measured transport resistances. Hence, constrictivity represents the dominant microstructure parameter, which controls the effective transport properties in the analysed membrane materials. An empirical relationship is then derived for the calculation of effective transport properties based on phase volume fraction, tortuosity, and constrictivity.de_CH
dc.language.isoende_CH
dc.publisherSpringerde_CH
dc.relation.ispartofJournal of Materials Sciencede_CH
dc.rightsLicence according to publishing contractde_CH
dc.subjectMapde_CH
dc.subject.ddc621.3: Elektro-, Kommunikations-, Steuerungs- und Regelungstechnikde_CH
dc.titleThe influence of constrictivity on the effective transport properties of porous layers in electrolysis and fuel cellsde_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.doi10.21256/zhaw-1568-
dc.identifier.doi10.1007/s10853-012-6968-zde_CH
zhaw.funding.euNode_CH
zhaw.issue7de_CH
zhaw.originated.zhawYesde_CH
zhaw.pages.end2952de_CH
zhaw.pages.start2934de_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume48de_CH
zhaw.embargo.end2019-01-01de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
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Holzer, L., Wiedenmann, D., Münch, B., Keller, L., Prestat, M., Gasser, P., Robertson, I., & Grobéty, B. (2013). The influence of constrictivity on the effective transport properties of porous layers in electrolysis and fuel cells. Journal of Materials Science, 48(7), 2934–2952. https://doi.org/10.21256/zhaw-1568
Holzer, L. et al. (2013) ‘The influence of constrictivity on the effective transport properties of porous layers in electrolysis and fuel cells’, Journal of Materials Science, 48(7), pp. 2934–2952. Available at: https://doi.org/10.21256/zhaw-1568.
L. Holzer et al., “The influence of constrictivity on the effective transport properties of porous layers in electrolysis and fuel cells,” Journal of Materials Science, vol. 48, no. 7, pp. 2934–2952, 2013, doi: 10.21256/zhaw-1568.
HOLZER, Lorenz, Daniel WIEDENMANN, Beat MÜNCH, Lukas KELLER, Michel PRESTAT, Philippe GASSER, Iain ROBERTSON und Bernard GROBÉTY, 2013. The influence of constrictivity on the effective transport properties of porous layers in electrolysis and fuel cells. Journal of Materials Science. 2013. Bd. 48, Nr. 7, S. 2934–2952. DOI 10.21256/zhaw-1568
Holzer, Lorenz, Daniel Wiedenmann, Beat Münch, Lukas Keller, Michel Prestat, Philippe Gasser, Iain Robertson, and Bernard Grobéty. 2013. “The Influence of Constrictivity on the Effective Transport Properties of Porous Layers in Electrolysis and Fuel Cells.” Journal of Materials Science 48 (7): 2934–52. https://doi.org/10.21256/zhaw-1568.
Holzer, Lorenz, et al. “The Influence of Constrictivity on the Effective Transport Properties of Porous Layers in Electrolysis and Fuel Cells.” Journal of Materials Science, vol. 48, no. 7, 2013, pp. 2934–52, https://doi.org/10.21256/zhaw-1568.


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