全对称构型金属支撑固体氧化物燃料电池

All Symmetrical Metal Supported Solid Oxide Fuel Cells

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。

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）-430L anode/Zr0.88Sc0.22Ce0.0102.12（SSZ） electrolyte/SDC-430L cathode was developed by a tape casting- sin- tering-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 mW/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-430L electrodes. The pure ohmic resistances are 0.16, 0.21 and 0.29 Ω·cm2 and the polarization resistances are 0.67, 0.90 and 1.22 Ω·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-430L cell are 0.23 and 1.92 Ω·cm2 in 3%H20-97%H2 and air, respectively. Further optimizing the cell structure （e.g., applying a finer 430L backbone） and the catalyst materials （e.g., Ag, Pt containing composite materials） may enhance the electrochemical performances of such MS-SOFC.