【摘要】 与传统的全陶瓷结构的固体氧化物燃料电池(Solid Oxide Fuel Cell,SOFC)相比,金属支撑固体氧化物燃料电池(MS-SOFCs)具有材料成本低,结构稳定性高,抗热震性高等优点。为了促进SOFC的商业化,采用流延–烧结–浸渗工艺制备了Ce0.8Sm0.2O2-δ(SDC)-430L阳极/Zr0.88Sc0.22Ce0.01O2.12(SSZ)电解质/SDC-430L阴极构型的全对称结构金属支撑固体氧化物燃料电池(MS-SOFC)。电池以湿氢气为燃料、空气为氧化气,在600、650和700℃时的最大功率密度为220、250和280 m W/cm2。电化学阻抗谱的测试表明,电池的性能由SDC-430L电极的极化阻抗所主导,在700、650和600℃时,电池欧姆阻抗分别为0.16、0.21和0.29??cm2,极化阻抗分别为0.67、0.90和1.22??cm2。与阳极相比,阴极的极化阻抗更为显著。对称SDC-430L电池在3%H2O-97%H2和空气气氛中测得的极化阻抗分别为0.23和1.92??cm2(650℃)。进一步优化电池结构(例如采用更加精细的430L骨架)和催化材料(例如含有Ag、Pt的复合材料)将有助于提升该MS-SOFC的电化学性能。更多还原

【Abstract】 Metal-supported solid oxide fuel cells(MS-SOFCs) have many advantages like low materials cost,excellent structural stability and high tolerance toward rapid thermal cycling over the traditional all ceramic SOFCs.To facilitate the commercialization of SOFCs,an all symmetrical MS-SOFC with the structure of Ce0.8Sm0.2O2-δ(SDC)-430 L anode/Zr0.88Sc0.22Ce0.01O2.12(SSZ) electrolyte/SDC-430 L cathode was developed by a tape casting- sintering-infiltration method.When measured in humidified hydrogen fuel and air oxidant,the maximum power densities(MPD) of the fuel cell are 220,250 and 280 m W/cm2 at 600,650 and 700℃,respectively.Electrochemical impedance spectra measurement shows that the cell performances are primarily dominated by polarization resistances derived from the SDC-430 L electrodes.The pure ohmic resistances are 0.16,0.21 and 0.29 ??cm2 and the polarization resistances are 0.67,0.90 and 1.22 ??cm2 at 700,650 and 600℃,respectively.Compared with that of the anode,polarization resistance of cathode is much higher.When measured at 650℃,polarization resistances of the symmetrical SDC-430 L cell are 0.23 and 1.92 ??cm2 in 3%H2O-97%H2 and air,respectively.Further optimizing the cell structure(e.g.,applying a finer 430 L backbone) and the catalyst materials(e.g.,Ag,Pt containing composite materials) may enhance the electrochemical performances of such MS-SOFC.更多还原