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Multi-scale characterization of ceramic inert-substrate-supported and co-sintered solid oxide fuel cells

Wankmüller, Florian; Meffert, Matthias; Russner, Niklas; Weber, André; Schmieg, Johannes; Störmer, Heike; Dickel, Thorsten; Lupetin, Piero; Maier, Nicolas; Gerthsen, Dagmar; Ivers-Tiffée, Ellen

Abstract:
Understanding cell performance is essential for selecting cell components and the processing parameters for solid oxide fuel cells. The scale of relevant microstructural features in electrodes, electrolyte and supporting substrate covers several orders of magnitude. This contribution will demonstrate how advanced correlative multi-scale tomography can be used to identify those parameters: ranging from millimeter to nanometer scale. We employ optical microscopy, X-ray computed tomography (μ-CT), focused ion beam-scanning electron microscopy tomography and energy-dispersive X-ray spectroscopy– scanning transmission electron microscopy. Additional investigations by selected area electron diffraction allow a determination of the underlying crystal structures. An SOFC design based on the co-sintering of an inert substrate with various functional layers on top is used as a blueprint, allowing further methodological development. The effect of interdiffusion between phases and development of secondary phases on microstructure and chemical composition will be shown. Furthermore, porosity and tortuosity extracted individually from all porous layers will allow modeling of gas diffusion loss contributions within the co-fired cell structure. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000120629
Veröffentlicht am 28.06.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Laboratorium für Elektronenmikroskopie (LEM)
Institut für Angewandte Materialien - Werkstoffe der Elektrotechnik (IAM-WET)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2020
Sprache Englisch
Identifikator ISSN: 0022-2461, 1573-4803
KITopen-ID: 1000120629
Erschienen in Journal of materials science
Band 55
Heft 25
Seiten 11120–11136
Vorab online veröffentlicht am 03.06.2020
Nachgewiesen in Web of Science
Scopus
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