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Annealing of Gadolinium-Doped Ceria (GDC) Films Produced by the Aerosol Deposition Method


Exner, Jörg ; Pöpke, Hendrik ; Fuchs, Franz-Martin ; Kita, Jaroslaw ; Moos, Ralf:
Annealing of Gadolinium-Doped Ceria (GDC) Films Produced by the Aerosol Deposition Method.
In: Materials. Bd. 11 (2018) Heft 11 . - No. 2072.
ISSN 1996-1944
DOI: https://doi.org/10.3390/ma11112072

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Offizieller ProjekttitelProjekt-ID
Forschungsverbund ForOxiE2AZ-1143-14
Open Access PublizierenOhne Angabe

Projektfinanzierung: Bayerische Forschungsstiftung (BFS)


Solid oxide fuel cells need a diffusion barrier layer to protect the zirconia-based electrolyte if a cobalt-containing cathode material like lanthanum strontium cobalt ferrite (LSCF) is used. This protective layer must prevent the direct contact and interdiffusion of both components while still retaining the oxygen ion transport. Gadolinium-doped ceria (GDC) meets these requirements. However, for a favorable cell performance, oxide ion conducting films that are thin yet dense are required. Films with a thickness in the sub-micrometer to micrometer range were produced by the dry room temperature spray-coating technique, aerosol deposition. Since commercially available GDC powders are usually optimized for the sintering of screen printed films or pressed bulk samples, their particle morphology is nanocrystalline with a high surface area that is not suitable for aerosol deposition. Therefore, different thermal and mechanical powder pretreatment procedures were investigated and linked to the morphology and integrity of the sprayed films. Only if a suitable pretreatment was conducted, dense and well-adhering GDC films were deposited. Otherwise, low-strength films were formed. The ionic conductivity of the resulting dense films was characterized by impedance spectroscopy between 300 °C and 1000 °C upon heating and cooling. A mild annealing occurred up to 900 °C during first heating that slightly increased the electric conductivity of GDC films formed by aerosol deposition.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: dense films; electrical conductivity; thermal powder treatment; crystallite size; room temperature impact consolidation (RTIC)
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien > Lehrstuhl Funktionsmaterialien - Univ.-Prof. Dr.-Ing. Ralf Moos
Profilfelder > Advanced Fields > Neue Materialien
Forschungseinrichtungen > Forschungszentren > Bayreuther Materialzentrum - BayMAT
Forschungseinrichtungen > Forschungsstellen > ZET - Zentrum für Energietechnik
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien
Profilfelder > Advanced Fields
Forschungseinrichtungen > Forschungszentren
Forschungseinrichtungen > Forschungsstellen
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 26 Okt 2018 06:44
Letzte Änderung: 04 Mär 2019 10:28
URI: https://eref.uni-bayreuth.de/id/eprint/46147