高稳定微管中温质子导电燃料电池的电化学性能研究

Electrochemical properties of high stable mtcrotubule medium temperature proton conductive fuel cell

采用相转化方法,以质子导体BaZr0.1Ce0.7Y0.1Yb0.1O3-δ(BZCYYb)材料为电解质,制备了阳极支撑微管Ni-BZCYYb|BZCYYb|La0.6Sr0.4Co0.2Fe0.8O3-δ-Sm0.2Ce0.8O2-δ中温固体氧化物燃料电池。阳极、电解质和阴极的厚度分别为200μm、12μm和10μm。以加湿(3 vol.%H2O,30 sccm)氢气为燃料,空气为氧化剂进行电化学阻抗谱测试,电池在750℃、700℃、650℃和600℃的峰值功率密度分别为1.070 W/cm2、0.976 W/cm2、0.815 W/cm2和0.700 W/cm2。在750~600℃进行交流阻抗谱测试,Ni-BZCYYb阳极和LSCF阴极的浓度极化值仅为0.014~0.02Ω·cm2。BZCYYb电解质致密、无裂纹,电极具有非对称海绵状微孔,非常有利于形成三相界面,进而加速质子输运及反应。

The proton conducting anode-supported micro-tubular SOFCs have been successfully fabricated via simple phase-inversion process with BaZr0.1Ce0.7Y0.1Yb0.1O3-δ(BZCYYb)as the electrolyte.Typical micro-tubular cell is in the Ni-BZCYYbBZCYYbLa0.6Sr0.4Co0.2Fe0.8O3-δ-Sm0.2Ce0.8O2-δconfiguration consisting of anode,electrolyte and cathode with thicknesses of 200μm,12μm and 10μm,respectively.The cells show the peak power densities of 1.070 W/cm2,0.976 W/cm2,0.815 W/cm2,and 0.700 W/cm2 at 750℃,700℃,650℃and 600℃,respectively,characterized by electrochemical impedance spectroscopy performed with humidified(3 vol.%H2O,30 sccm)hydrogen as fuel and ambient air as oxidant.AC impedance spectroscopy shows very low concentration polarization values of 0.014~0.020Ω·cm2 at 750~600℃.Electrodes with micro sponge-like pores are well-adhered to the dense,crack-free BZCYYb electrolyte film.