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). Th...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.展开更多
Two kinds of TiO<sub>2</sub> filled epoxy coatings were designed and prepared to obtain pigments with different dispersion degrees of TiO<sub>2</sub> particles.Laser scanning confocal microscop...Two kinds of TiO<sub>2</sub> filled epoxy coatings were designed and prepared to obtain pigments with different dispersion degrees of TiO<sub>2</sub> particles.Laser scanning confocal microscope（LSCM）was used to investigate both the horizontal and vertical distributions of TiO<sub>2</sub> particles in the coatings.The results indicated that TiO<sub>2</sub> in the two samples shared considerable similarity in horizental dispersion,but exhibited great difference in vertical dispersion.TiO<sub>2</sub> showed uniform vertical distribution in disp coating,wheras a gap about 1.1μm was found in the non-disp coating,which significantly influenced the surface optical properties of the coatings during weathering.Based on the confocal data,the model of dispersion of pigments in the coatings was proposed and the change of surface properties during weathering was predicted:the surface optical properties showed an initial decrease followed by a subsequent increase,which was in good agreement with the weathering data.展开更多
基金the National Natural Science Foundation of China (50204007)the Talent Foundation of Yunnan Prov-ince (2005PY01-33)Program for New Century Excellent Talents in University (NCET-07-0387)
文摘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.
基金supported by the National Natural Science Foundation of China(Grant Nos.20944004,50943026)the Open Research Program of the Key Laboratory of Rubber-Plastic(QUST),the Ministry of Education of China(Grant No.0805021)the PhD Research Program of QUST(Grant No.0022200)
文摘Two kinds of TiO<sub>2</sub> filled epoxy coatings were designed and prepared to obtain pigments with different dispersion degrees of TiO<sub>2</sub> particles.Laser scanning confocal microscope（LSCM）was used to investigate both the horizontal and vertical distributions of TiO<sub>2</sub> particles in the coatings.The results indicated that TiO<sub>2</sub> in the two samples shared considerable similarity in horizental dispersion,but exhibited great difference in vertical dispersion.TiO<sub>2</sub> showed uniform vertical distribution in disp coating,wheras a gap about 1.1μm was found in the non-disp coating,which significantly influenced the surface optical properties of the coatings during weathering.Based on the confocal data,the model of dispersion of pigments in the coatings was proposed and the change of surface properties during weathering was predicted:the surface optical properties showed an initial decrease followed by a subsequent increase,which was in good agreement with the weathering data.
