A novel process route using tape casting and stacking for fabricating porous scaffold of solid oxide fuel cells （SOFC） was demonstrated. The linear shrinkages of anode （Ni-YSZ, YSZ stands for 3% Y2O3 （mole fractio...A novel process route using tape casting and stacking for fabricating porous scaffold of solid oxide fuel cells （SOFC） was demonstrated. The linear shrinkages of anode （Ni-YSZ, YSZ stands for 3% Y2O3 （mole fraction） stabilized ZrO2 ） and cathode （LSM-YSZ, LSM stands for La0.8Sr0.2MnO3 ） were optimized to be uniform with that of electrolyte during sintering, by controlling the content of pore former. The micromorphology and interface microstructure of the cross-section of the porous scaffold were observed by optical microscope and scanning electron microscope, respectively. The element distribution and phase composition were analyzed by energy dispersive spectrometer and X-ray diffraction, respectively. The results showed that the porous scaffold with regular pore shape and high specific surface area was obtained after sintering at 1 350℃. The fabricated porous scaffold had defect free interracial structures due to the uniform shrinkage of anode, cathode and electrolyte layers. In addition, it was shown that diffusions of Zr, Ni and La caused a progressive boundary between YSZ, Ni-YSZ and LSM-YSZ layers. The interface between anode and electrolyte （Ni-YSZ/YSZ） was mainly composed of Ni, YSZ and a small amount of NiO, and the interface between cathode and electrolyte （LSM-YSZ/YSZ） was mainly composed of YSZ, LSM and a small amount of La2Zr2O7.展开更多
mole fraction) yttria-stabilized zirconia electrolyte thin wall tubes were p repared by i mproved slip casting method. The length and wall thickness of the tubes are 266 mm and 0.4～0.9 mm, respectively and the relat...mole fraction) yttria-stabilized zirconia electrolyte thin wall tubes were p repared by i mproved slip casting method. The length and wall thickness of the tubes are 266 mm and 0.4～0.9 mm, respectively and the relative density is 96.7%. The microstr ucture and electrical properties of samples sintered at different temperatures w ere studied using SEM and ac impedance spectroscopy. The effect of sintered dens ity, grain and grain boundary on the electrical properties of the samples was analyzed. The research results show that the density of the samples increase s gradually with increasing sintering temperatures. The microstructure of sample s strongly influences its electrical properties, and the electrical properti es of samples enhance with the increase of sintered density. The ionic conductiv ity of grain and grain boundary is increased as the sintering temperature incre ases. Better sinterability of the samples was obtained at the sintering temperat ure of 1650 ℃. The maximum open circuit voltage and short circuit current for s ingle cell is 0.946 V and 1.84 A, respectively. The maximum output power of sing le cell is 0.46 W at the temperature of 850 ℃.展开更多
文摘A novel process route using tape casting and stacking for fabricating porous scaffold of solid oxide fuel cells （SOFC） was demonstrated. The linear shrinkages of anode （Ni-YSZ, YSZ stands for 3% Y2O3 （mole fraction） stabilized ZrO2 ） and cathode （LSM-YSZ, LSM stands for La0.8Sr0.2MnO3 ） were optimized to be uniform with that of electrolyte during sintering, by controlling the content of pore former. The micromorphology and interface microstructure of the cross-section of the porous scaffold were observed by optical microscope and scanning electron microscope, respectively. The element distribution and phase composition were analyzed by energy dispersive spectrometer and X-ray diffraction, respectively. The results showed that the porous scaffold with regular pore shape and high specific surface area was obtained after sintering at 1 350℃. The fabricated porous scaffold had defect free interracial structures due to the uniform shrinkage of anode, cathode and electrolyte layers. In addition, it was shown that diffusions of Zr, Ni and La caused a progressive boundary between YSZ, Ni-YSZ and LSM-YSZ layers. The interface between anode and electrolyte （Ni-YSZ/YSZ） was mainly composed of Ni, YSZ and a small amount of NiO, and the interface between cathode and electrolyte （LSM-YSZ/YSZ） was mainly composed of YSZ, LSM and a small amount of La2Zr2O7.
文摘mole fraction) yttria-stabilized zirconia electrolyte thin wall tubes were p repared by i mproved slip casting method. The length and wall thickness of the tubes are 266 mm and 0.4～0.9 mm, respectively and the relative density is 96.7%. The microstr ucture and electrical properties of samples sintered at different temperatures w ere studied using SEM and ac impedance spectroscopy. The effect of sintered dens ity, grain and grain boundary on the electrical properties of the samples was analyzed. The research results show that the density of the samples increase s gradually with increasing sintering temperatures. The microstructure of sample s strongly influences its electrical properties, and the electrical properti es of samples enhance with the increase of sintered density. The ionic conductiv ity of grain and grain boundary is increased as the sintering temperature incre ases. Better sinterability of the samples was obtained at the sintering temperat ure of 1650 ℃. The maximum open circuit voltage and short circuit current for s ingle cell is 0.946 V and 1.84 A, respectively. The maximum output power of sing le cell is 0.46 W at the temperature of 850 ℃.
文摘采用固相反应法合成A缺位的(La0.8Sr0.2)0.95MnO3(LSM95)作为阴极材料,Zr0.9Sc0.1SO1.95(SSZ)商业粉体作为电解质材料,溶胶-凝胶法合成的La0.8Sr0.2Cr0.5Mn0.5O3-(LSCrM)作为阳极电催化材料,利用流延、共烧结及浸渍法得到结构为LSCr M-CeO2|SSZ|3YSZ-LSM95的阴极支撑型固体氧化物燃料电池,分别在氢气气氛和甲烷气氛中进行电化学性能测试.结果表明,浸渍0.11 g·cm^-2CeO2的LSCrM-CeO2|SSZ|3YSZ-LSM95单电池在以CH4为燃料时,600、650、700、750和800℃下的功率密度分别为1.68、4.70、12.40、28.08和54.78 m W·cm^-2,表现出一定的电化学性能和较好的稳定性.
