Performance of LSCM-CDC Composite Anode for ITSOFC
来源期刊：Journal of Rare Earths2007年第S1期
论文作者：马学菊 陈秀华 马文会 戴永年
文章页码：391 - 394
摘 要：It was prepared by glycine-nitrate process （GNP） method for a novel composite material La0.7Sr0.3Cr0.5Mn0.5O3-δ-Ce0.8Ca0.2O2-δ （LSCM-CDC） used for anode of intermediate temperature solid oxide fuel cell （ITSOFC）. The microstructure and properties of composite anode LSCM-CDC were measured via X-ray diffraction （XRD）, scanning electron microscopy （SEM）, AC impedance and four-probe direct current methods. Fluorite-perovskite compounded phase structure was obtained after being sintered at 1400 ℃ for 15 h, the optimum composition of the composite anode of LSCM and CDC was 7 to 3 at molar ratio. At 850 ℃, the electronic conductivity was 6.49 S·cm-1 in air and 1 S·cm-1 in the reduction atmosphere, respectively. The AC impedance spectra with two arcs showed that LSCM-CDC had low ionic conductivity, which was about two orders of magnitude lower than the electronic conductivity. LSCM-CDC composite anode was stable under different temperatures in pure methane gas with good catalytic performance, which indicated that the composite was a promising anode for ITSOFC.
马学菊，陈秀华，马文会，戴永年
摘 要：It was prepared by glycine-nitrate process （GNP） method for a novel composite material La0.7Sr0.3Cr0.5Mn0.5O3-δ-Ce0.8Ca0.2O2-δ （LSCM-CDC） used for anode of intermediate temperature solid oxide fuel cell （ITSOFC）. The microstructure and properties of composite anode LSCM-CDC were measured via X-ray diffraction （XRD）, scanning electron microscopy （SEM）, AC impedance and four-probe direct current methods. Fluorite-perovskite compounded phase structure was obtained after being sintered at 1400 ℃ for 15 h, the optimum composition of the composite anode of LSCM and CDC was 7 to 3 at molar ratio. At 850 ℃, the electronic conductivity was 6.49 S·cm-1 in air and 1 S·cm-1 in the reduction atmosphere, respectively. The AC impedance spectra with two arcs showed that LSCM-CDC had low ionic conductivity, which was about two orders of magnitude lower than the electronic conductivity. LSCM-CDC composite anode was stable under different temperatures in pure methane gas with good catalytic performance, which indicated that the composite was a promising anode for ITSOFC.
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