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dc.contributor.authorBurnat, Dariusz-
dc.contributor.authorNurk, Gunnar-
dc.contributor.authorHolzer, Lorenz-
dc.contributor.authorKopecki, Michal-
dc.contributor.authorHeel, Andre-
dc.date.accessioned2018-08-09T12:19:56Z-
dc.date.available2018-08-09T12:19:56Z-
dc.date.issued2018-05-
dc.identifier.issn0378-7753de_CH
dc.identifier.issn1873-2755de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/8923-
dc.description.abstractElectrochemical performance of ceramic (Ni-free) SOFC anodes based on La0.2Sr0.7TiO3-δ (LST) and Gd0.1Ce0.9O1.95-δ (CGO) is thoroughly investigated. Microstructures and compositions are systematically varied around the percolation thresholds of both phases by modification of phase volume fractions, particle size distributions and firing temperature. Differential impedance spectroscopy was performed while varying gas composition, electrical potential and operating temperature, which allows determining four distinct electrode processes. Significant anode impedances are measured at low frequencies, which in contrast to the literature cannot be linked with gas concentration impedance. The dominant low frequency process (∼1 Hz) is attributed to the chemical capacitance. Combined EIS and microstructure investigations show that the chemical capacitance correlates inversely with the available surface area of CGO, indicating CGO surface reactions as the kinetic limitation for the dominant anode process and for the associated chemical capacitance. In anodes with a fine-grained microstructure this limitation is significantly smaller, which results in an impressive power output as high as 0.34 Wcm−2. The anodes show high redox stability by not only withstanding 30 isothermal redox cycles, but even improving the performance. Hence, compared to conventional Ni-cermet anodes the new LST-CGO material represents an interesting alternative with much improved redox-stability.de_CH
dc.language.isoende_CH
dc.publisherElsevierde_CH
dc.relation.ispartofJournal of Power Sourcesde_CH
dc.rightsLicence according to publishing contractde_CH
dc.subjectSOFCde_CH
dc.subjectTitanates LSTde_CH
dc.subjectMicrostructure analysisde_CH
dc.subjectElectrochemical Impedance Spectroscopyde_CH
dc.subjectRedoxde_CH
dc.subjectAnodesde_CH
dc.subject.ddc540: Chemiede_CH
dc.subject.ddc621.3: Elektro-, Kommunikations-, Steuerungs- und Regelungstechnikde_CH
dc.titleLanthanum doped strontium titanate - ceria anodes : deconvolution of impedance spectra and relationship with composition and microstructurede_CH
dc.typeBeitrag in wissenschaftlicher Zeitschriftde_CH
dcterms.typeTextde_CH
zhaw.departementSchool of Engineeringde_CH
zhaw.organisationalunitInstitute of Computational Physics (ICP)de_CH
zhaw.organisationalunitInstitute of Materials and Process Engineering (IMPE)de_CH
dc.identifier.doi10.1016/j.jpowsour.2018.03.024de_CH
zhaw.funding.euNode_CH
zhaw.originated.zhawYesde_CH
zhaw.pages.end75de_CH
zhaw.pages.start62de_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume385de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
zhaw.funding.snf407040-154047de_CH
zhaw.webfeedProzesstechnikde_CH
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Burnat, D., Nurk, G., Holzer, L., Kopecki, M., & Heel, A. (2018). Lanthanum doped strontium titanate - ceria anodes : deconvolution of impedance spectra and relationship with composition and microstructure. Journal of Power Sources, 385, 62–75. https://doi.org/10.1016/j.jpowsour.2018.03.024
Burnat, D. et al. (2018) ‘Lanthanum doped strontium titanate - ceria anodes : deconvolution of impedance spectra and relationship with composition and microstructure’, Journal of Power Sources, 385, pp. 62–75. Available at: https://doi.org/10.1016/j.jpowsour.2018.03.024.
D. Burnat, G. Nurk, L. Holzer, M. Kopecki, and A. Heel, “Lanthanum doped strontium titanate - ceria anodes : deconvolution of impedance spectra and relationship with composition and microstructure,” Journal of Power Sources, vol. 385, pp. 62–75, May 2018, doi: 10.1016/j.jpowsour.2018.03.024.
BURNAT, Dariusz, Gunnar NURK, Lorenz HOLZER, Michal KOPECKI und Andre HEEL, 2018. Lanthanum doped strontium titanate - ceria anodes : deconvolution of impedance spectra and relationship with composition and microstructure. Journal of Power Sources. Mai 2018. Bd. 385, S. 62–75. DOI 10.1016/j.jpowsour.2018.03.024
Burnat, Dariusz, Gunnar Nurk, Lorenz Holzer, Michal Kopecki, and Andre Heel. 2018. “Lanthanum Doped Strontium Titanate - Ceria Anodes : Deconvolution of Impedance Spectra and Relationship with Composition and Microstructure.” Journal of Power Sources 385 (May): 62–75. https://doi.org/10.1016/j.jpowsour.2018.03.024.
Burnat, Dariusz, et al. “Lanthanum Doped Strontium Titanate - Ceria Anodes : Deconvolution of Impedance Spectra and Relationship with Composition and Microstructure.” Journal of Power Sources, vol. 385, May 2018, pp. 62–75, https://doi.org/10.1016/j.jpowsour.2018.03.024.


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