Preparation and Characterization of Cathode Materials La0.7Sr0.3-xCaxCo0.9Fe0.1O3-δ by Reverse Titration Co-Precipitation Method for ITSOFC
来源期刊：Journal of Rare Earths2007年第S1期
论文作者：高文元 胡志强 李长敏 唐乃岭 孙福禄 唐旭 魏蔷薇 孙永平
文章页码：358 - 363
摘 要：The precursors of La0.7Sr0.3-xCaxCo0.9Fe0.1O3-δ（LSCCF, x=0.05, 0.10, 0.15, 0.20） as the cathode materials for intermediate temperature solid oxide fuel cell （ITSOFC） were prepared by reverse titration co-precipitation method with metal-nitrates as starting materials and mixed alkali （NaOH and Na2CO3） as a precipitating agent. The formation process of LSCCF from the precursors was monitored by TG-DSC, and the crystal structure and particles morphology of the precursors which were calcined at 600, 800, 1000 ℃ for 3 h were characterized using XRD, SEM technologies. Compared with the solid state reaction of constituent oxides, when the pH value of the precipitating solution was in the range of 9.1～9.5, the LSCCF powders from the precursors caclined at 800 ℃ for 3 h had high purity, homogeneous and single perovskite phase. The electrical conductivity of the LSCCF samples sintered at 1200 ℃ for 3 h, which was measured as a function of temperatures from 100 to 800 ℃ by DC four-probe method in air, decreased with x from 0.05 to 0.20. The value of electrical conductivity was almost equal because of Ca2+, Sr2+ co-dopant resulting in the "mix effect" while x=0.10 or 0.15. The electrical conductivity of all doped samples was higher than 100 S·cm-1 at intermediate temperatures from 500 to 800 ℃, and there was good compatibility between the LSCCF cathode and Ce0.8Sm0.2O2 electrolyte.
高文元，胡志强，李长敏，唐乃岭，孙福禄，唐旭，魏蔷薇，孙永平
摘 要：The precursors of La0.7Sr0.3-xCaxCo0.9Fe0.1O3-δ（LSCCF, x=0.05, 0.10, 0.15, 0.20） as the cathode materials for intermediate temperature solid oxide fuel cell （ITSOFC） were prepared by reverse titration co-precipitation method with metal-nitrates as starting materials and mixed alkali （NaOH and Na2CO3） as a precipitating agent. The formation process of LSCCF from the precursors was monitored by TG-DSC, and the crystal structure and particles morphology of the precursors which were calcined at 600, 800, 1000 ℃ for 3 h were characterized using XRD, SEM technologies. Compared with the solid state reaction of constituent oxides, when the pH value of the precipitating solution was in the range of 9.1～9.5, the LSCCF powders from the precursors caclined at 800 ℃ for 3 h had high purity, homogeneous and single perovskite phase. The electrical conductivity of the LSCCF samples sintered at 1200 ℃ for 3 h, which was measured as a function of temperatures from 100 to 800 ℃ by DC four-probe method in air, decreased with x from 0.05 to 0.20. The value of electrical conductivity was almost equal because of Ca2+, Sr2+ co-dopant resulting in the "mix effect" while x=0.10 or 0.15. The electrical conductivity of all doped samples was higher than 100 S·cm-1 at intermediate temperatures from 500 to 800 ℃, and there was good compatibility between the LSCCF cathode and Ce0.8Sm0.2O2 electrolyte.
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