English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/55950
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Textured cermets of CeO2 (or GDC) with Co for solid oxide fuel cells anodes

AuthorsOrtega, Luis; Peña, J. I.; Larrea, A. ; Gil, Vanesa; Orera, V. M.
Directional solidification of eutectics
Issue DateOct-2010
CitationInternational Journal of Hydrogen Energy 35(20): 11499-11504 (2010)
AbstractCermets composed of submicron size alternating lamellae of CeO2, or 10% Gadolinia doped Ceria (GDC), and porous-metallic Cobalt have been prepared from eutectic oxide mixtures. A fine eutectic structure was obtained by fast directional solidification of the cobalt oxide–ceria oxide eutectic composite using the Laser Floating Zone (LFZ) technique. The resulting microstructure, with an interphase spacing down to 0.5 μm, was obtained for solidification rates of 750 mm/h. Textured cermets were obtained by subsequent reduction under H2 containing atmosphere of the eutectic oxide composite. The reduction kinetics was studied in the 550–750 °C temperature range and effective diffusion coefficients were obtained. The reduction process does not correspond to a typical thermally activated process. The cermets are composed of ceria lamellae of about 200 nm thickness alternated with porous-metallic cobalt lamellae of ≤400 nm. The lamellar microstructure of the cermets favours oxygen ion mobility through ceria and its size can be controlled by solidification rate of the eutectic precursor. These materials are proposed as SOFC anodes.
Description6 páginas, 5 figuras.
Publisher version (URL)http://dx.doi.org/10.1016/j.ijhydene.2010.05.013
Appears in Collections:(ICMA) Artículos
Files in This Item:
File Description SizeFormat 
restringido.pdf21,67 kBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.