Study on Sm1.8Ce0.2CuO4-Ce0.9Gd0.1O1.95 composite cathode materials for intermediate temperature solid oxide fuel cell
Résumé
Sm1.8Ce0.2CuO4-xCe0.9Gd0.1O1.95 (SCC-xCGO, x = 0-12 vol.%) composite cathodes supported on Ce0.9Gd0.1O1.95 (CGO) electrolyte are studied for applications in IT-SOFCs. Results show that Sm1.8Ce0.2CuO4 material is chemically compatible with Ce0.9Gd0.1O1.95 at 1000 °C. The composite electrode exhibits optimum microstructure and forms good contact with the electrolyte after sintering at 1000 °C for 4 h. The polarization resistance (Rp) reduces to the minimum value of 0.17 Ω cm2 at 750 °C in air for SCC-CGO06 composite cathode. The relationship between Rp and oxygen partial pressure indicates that the reaction rate-limiting step is the surface diffusion of the dissociative adsorbed oxygen on the composite cathode. Highlights : * SCC material exhibits good chemical compatibility with CGO at 1000 °C. * The optimum composite SCC-CGO06 gives the lowest ASR of 0.17 Ω cm2 at 750 °C in air. * The rate-limiting step for oxygen reduction is surface diffusion of the dissociative adsorbed oxygen.
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