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

Title data

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. Vol. 11 (2018) Issue 11 . - No. 2072.
ISSN 1996-1944

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Forschungsverbund ForOxiE2
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Project financing: Bayerische Forschungsstiftung (BFS)

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: dense films; electrical conductivity; thermal powder treatment; crystallite size; room temperature impact consolidation (RTIC)
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Research Institutions > Research Units > ZET - Zentrum für Energietechnik
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Units
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 26 Oct 2018 06:44
Last Modified: 04 Mar 2019 10:28