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dc.contributor.authorBurnat, Dariusz-
dc.contributor.authorHolzer, Lorenz-
dc.contributor.authorNurk, Gunnar-
dc.contributor.authorHeel, Andre-
dc.date.accessioned2018-08-09T12:45:11Z-
dc.date.available2018-08-09T12:45:11Z-
dc.date.issued2018-
dc.identifier.isbn978-3-905592-23-8de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/8934-
dc.descriptionB0607de_CH
dc.description.abstractNi-free anodes in SOFC and SOEC that can withstand severe conditions and provide high performances, which is of great practical and scientific interest. Lanthanum doped strontium titanates (LST) are among the most interesting alternatives to state of the are Ni-YSZ due to their excellent redox stability [1] low reactivity with other fuel cell components [2] and good electronic conductivity. Insufficient ionic conductivity of LST is only one of few drawbacks of this class of materials and can be mitigated through fabrication and optimization of composite electrodes containing LST and good ionic conductor (e.g. CGO or YSZ). In this study the electrochemical performance of ceramic (Ni-free) SOFC anodes, consisting of A-site deficient La0.2Sr0.7TiO3-d (LST) perovskite and Gd0.1Ce0.9O1.95-d (CGO), was thoroughly investigated. Microstructures and compositions were systematically modified to gain information about the microstructural impact on electrochemical performance. The highest impedances are measured at low frequencies, which in contrast to the literature cannot be linked with gas concentration impedance. The low frequency process (ca. ~1 Hz) was attributed to the chemical capacitance. The EIS and advanced microstructure quantification methodology point out that the chemical capacitance correlates inversely with the available surface area of CGO. The influence of CGO surface reactions, such as hydrogen adsorption, which represent the kinetic limitation for the dominant anode process at 1 Hz region and for the associated chemical capacitance, is discussed. The impact of 30 isothermal redox cycles on degradation and the anode performance is presented.de_CH
dc.language.isoende_CH
dc.rightsNot specifiedde_CH
dc.subject.ddc621.3: Elektro-, Kommunikations-, Steuerungs- und Regelungstechnikde_CH
dc.titleLST-CGO anodes : deconvolution of impedance spectra and relationship with composition and microstructurede_CH
dc.typeKonferenz: Paperde_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
zhaw.conference.details13th European SOFC & SOE Forum 2018, Lucerne, 3-6 July 2018de_CH
zhaw.funding.euNode_CH
zhaw.originated.zhawYesde_CH
zhaw.pages.end102de_CH
zhaw.pages.start93de_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.publication.reviewNot specifiedde_CH
zhaw.title.proceedingsProceedings of 13th European SOFC & SOE Forum 2018de_CH
zhaw.funding.snf407040-154047de_CH
zhaw.webfeedProzesstechnikde_CH
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Burnat, D., Holzer, L., Nurk, G., & Heel, A. (2018). LST-CGO anodes : deconvolution of impedance spectra and relationship with composition and microstructure [Conference paper]. Proceedings of 13th European SOFC & SOE Forum 2018, 93–102.
Burnat, D. et al. (2018) ‘LST-CGO anodes : deconvolution of impedance spectra and relationship with composition and microstructure’, in Proceedings of 13th European SOFC & SOE Forum 2018, pp. 93–102.
D. Burnat, L. Holzer, G. Nurk, and A. Heel, “LST-CGO anodes : deconvolution of impedance spectra and relationship with composition and microstructure,” in Proceedings of 13th European SOFC & SOE Forum 2018, 2018, pp. 93–102.
BURNAT, Dariusz, Lorenz HOLZER, Gunnar NURK und Andre HEEL, 2018. LST-CGO anodes : deconvolution of impedance spectra and relationship with composition and microstructure. In: Proceedings of 13th European SOFC & SOE Forum 2018. Conference paper. 2018. S. 93–102. ISBN 978-3-905592-23-8
Burnat, Dariusz, Lorenz Holzer, Gunnar Nurk, and Andre Heel. 2018. “LST-CGO Anodes : Deconvolution of Impedance Spectra and Relationship with Composition and Microstructure.” Conference paper. In Proceedings of 13th European SOFC & SOE Forum 2018, 93–102.
Burnat, Dariusz, et al. “LST-CGO Anodes : Deconvolution of Impedance Spectra and Relationship with Composition and Microstructure.” Proceedings of 13th European SOFC & SOE Forum 2018, 2018, pp. 93–102.


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