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Article Dans Une Revue Materials Research Bulletin Année : 2010

Elaboration, by tape casting, and thermal characterization of a solid oxide fuel half-cell for low temperature applications

Résumé

In the past years, a major interest has been devoted to decrease the working temperature of solid oxide fuel cell (SOFC) down to about 700 8C. In this respect, materials with a high ionic conduction at intermediate temperature have to be found and the processes to elaborate fuel cells, using these new materials, have to be developed. Apatite materials (La10xSrx(SiO4)6O2d) are attractive candidates for solid electrolyte working at intermediate temperature. The ceramic powder was produced by solid state reaction and was tape cast to obtain green sheets. Concerning the cathode, a perovskite oxide (La1xSrxMn1yCoyO3d) has been chosen. The perovskite powder was also shaped by tape casting with the introduction of a pore forming agent (corn-starch) to obtain the required porosity in the sintered cathode. The co-firing of the electrolyte/cathode half-cell in air at 1400 8C–2 h gives a flat sample with a dense apatite (98.2%), a 42.7% porous cathode and neither delamination nor chemical reactivity between electrolyte and cathode materials. The dimensional behaviour of the electrolyte material is stable for an oxygen partial pressure ranging from 1010 to 0.21 atmosphere, from room temperature to 700 8C. The thermal expansion coefficients of the electrolyte and cathode materials are rather close (Da = 2.8 106 K1) under air.

Dates et versions

hal-00466399 , version 1 (23-03-2010)

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Claire Bonhomme, S. Beaudet-Savignat, Thierry Chartier, C. Pirovano, R.N. Vannier. Elaboration, by tape casting, and thermal characterization of a solid oxide fuel half-cell for low temperature applications. Materials Research Bulletin, 2010, 45, pp.491-498. ⟨10.1016/j.materresbull.2009.11.001⟩. ⟨hal-00466399⟩
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