Synthesis and Characterization of the Cathode Materials La_0.7Sr_0.15Ca_0.15Co_1-yFe_yO_3-δ for ITSOFC

Abstract:

La0.7Sr0.15Ca0.15Co1-yFeyO3-δ(LSCCF)powders with 0.2y0.5 for the applications as the cathode materials in intermediate temperature solid oxide fuel cell(ITSOFC) were synthesized by glycine-nitrates-process(GNP) using metal-nitrates and glycine as the raw materials. The process, crystal structure and particles morphology of the powders calcined at 600°C,800°C,1000°C for 3h were characterized by IR,XRD and SEM. The experimental results show that co-doped Ca2+ and Sr2+ replacing some La3+ in A site and Fe3+ replacing some Co3+ in B site didn’t influence the formation of perovskite structure and the powders calcined at 800°C for 3h were high pure single perovskite state. The electrical conductivity of LSCCF samples sintered at 1200°C for 3h,was measured as a function of temperature from 100°C to 800°C by the four-probe DC method in air.As a result, the conducting mechanism of LSCCF is p-type small polaron hopping process, and the electrical conductivity are all higher than 100 S/cm. But the electrical conductivity of LSCCF samples increase with Fe3+ content decrease.

• Periodical: Advanced Materials Research (Volumes 105-106)
• Pages: 653-656
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.105-106.653
• Online since: April 2010
• Authors: W.Y. Gao, Z.Q. Hu, X.G. Sui, C.M. Li, N.L. Tang, H.L. Cao
• Keywords: Cathode, Electrical Conductivity, Glycine-Nitrate Process, La_0.7Sr_0.15Ca_0.15Co_1-yFe_yO_3-δ

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