Influence of Sintering Temperature on the Electrochemical Performance of Sm_0.5-XGdxSr_0.5Co _3-δ/Gd_0.1Ce_0.9O_1.95 Composite Cathode

Abstract:

In this paper, Sm_0.5-xGd_xSr_0.5CoO_3-δ (SGSC, x=0 and 0.2) powders were prepared using the solid-state reaction method. Their structure was identified by XRD. All powders formed the perovskite phase when calcined at 1100°C for 5 h. Sm_0.3Gd_0.2Sr_0.5CoO_3-δ/Gd_0.1Ce_0.9O_1.95 slurries were screen printed onto both surfaces of Gd_0.1Ce_0.9O_1.95 electrolyte and fired at different temperatures to fabricate the composite cathodes. The electrochemical property of the composite cathodes was characterized by the alternative current impedance spectroscopy. The impedance resistance of the composite cathodes increased with the increase of sintering temperature. For instance, the impedance resistance of the composite cathode fired at 1000 °C was 0.0875 Ω·cm² at 700 °C, while it was 0.175 Ω·cm² when fired at 1100 °C.

• Periodical: Advanced Materials Research (Volumes 239-242)
• Pages: 1613-1616
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.239-242.1613
• Online since: May 2011
• Authors: Ji Min Zhai, Xi Wen Song, Fen Zhou, Sheng Li An
• Keywords: Composite Cathode, Polarisation Resistance, Sintering Temperature, Solid Oxide Fuel Cell (SOFC)

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