Journal
SOLID STATE IONICS
Volume 179, Issue 38, Pages 2155-2159Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2008.07.025
Keywords
Cermet; Anode materials; Ceramic proton conductors; Impedance spectroscopy
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Funding
- Plan d'Action National pour l'Hydrogene et les piles A combustible (PANH) de l'Agence Nationale de la Recherche [ANR-05-PANH-015-03]
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Cermet electrodes of Ni-BaCe0.9Y0.1O2.95 and assemblies of Ni-cermet/thin film electrolyte/Ni-cermet have been elaborated from a ceramic nanopowder synthesized by flash combustion. Anode/electrolyte/anode assemblies with a fully dense electrolyte of thickness ca. 20 mu m were fabricated by a co-pressing and co-sintering process followed by reduction of NiO to Ni metal. In the reduced state, the anode microstructures comprise a uniform and homogeneous distribution of Ni metal and ceramic phase with relatively high porosity and high conductivity. Impedance spectroscopy showed that there were two major rate-limiting processes for the electrode reaction and that cell performance is determined by the electrolyte resistance. A total specific resistance of 0.4 Omega cm(2) at 600 degrees C was obtained for optimized assemblies. (C) 2008 Elsevier B.V. All rights reserved.
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