【摘要】 采用离心沉降法及高温共烧结工艺在多孔NiO-Sm0.2Ce0.8O1.9(SDC)阳极上成功地制备了SDC/LSGM(La0.9Sr0.1Ga0.8Mg0.2O3-δ)/SDC电解质薄膜.经共烧结制备了11μm SDC/15μm LSGM/13μm SDC三层复合电解质薄膜.电池在800℃最大输出功率密度为0.92 W/cm2,但电池的开路电压0.89 V低于理论电动势.电池微结构和元素分析表明,高温共烧结时Ni扩散到LSGM电解质薄膜中引起电子电导,导致电池开路电压偏低.阻抗谱测试表明,引入SDC电解质作为隔离层后,欧姆极化过程和电极极化过程共同影响电池的性能.更多还原

【Abstract】 Anode-supported solid oxide fuel cells(SOFCs) composed of NiO-SDC(Sm0.2Ce0.8O1.9) composite an-ode,thin tri-layer electrolyte,and La0.6Sr0.4Co0.8Fe0.2O3(LSCF)-La0.9Sr0.1Ga0.8Mg0.2O3-δ(LSGM) composite cathode were fabricated.The thin 11 μm SDC/15 μm LSGM/13 μm SDC tri-layer electrolyte was prepared by centrifugal casting and co-firing technique.Cell tests in air as oxidant and humidified hydrogen as fuel show a maximum power density of 0.92 W /cm2 at 800℃.However,the open-circuit voltage(OCV) of these cells is 0.89 V which is lower than the Nernst potential.The above result is due to electronic conductivity in the LSGM layer,resulting from Ni impurities that entered during co-firing with the NiO-SDC anode.While the SDC buffer layers are introduced as buffer layers,impedance measurements indicate that both the ohmic resistance and the polarization resistance dominate the cell performance.更多还原