阴极支撑型固体氧化物燃料电池的制备与测试

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.

Preparation and Characterization of Cathode Supported Solid Oxide Fuel Cell

A site deficient (La_0.8Sr_0.2)_0.95MnO₃ (LSM95) powder was synthesized by solid state reaction as a cathode material. The commercial Zr_0.9Sc_0.1SO_1.95 (SSZ) was selected as an electrolyte material and La_0.8Sr_0.2Cr_0.5Mn_0.5O₃- (LSCrM) was synthesized by sol-gel method as an anode material. Accordingly, single cells of LSCrM-CeO₂|SSZ|3YSZ-LSM95 were prepared by tape casting, sintering and impregnation. The single cell test results for LSCrM-CeO₂|SSZ|3YSZ-LSM95 with 0.11 g·cm ^-2 CeO₂ and using CH₄ as a fuel showed the power densities of 1.68, 4.70, 12.4, 28.08 and 54.78 mW·cm ^-2 at 600, 650, 700, 750 and 800 ^oC, respectively. Durability test at the current density of 46.50 mA·cm ^-2 for over 130 h revealed that the cell degradation was owing to the decrease of open circuit voltage. The impregnated anode had good stability in performance. No carbon deposition was observed on the anode after the cell operation with CH₄. The as-synthesized LSM95 powder exhibited good chemical compatibility with zirconia electrolyte, making it possible to prepare cathode supported cells with co-sintering. Meanwhile, LSCrM could form the perovskite phase at 900 ^oC and obtain the similar thermal expansion coefficient to the cathode support and electrolyte, which is contributed to the stability of multi-layer structure in the cell. The successful preparation of the cathode supported cells with a simple method shall provide a good platform for the research of various new anode materials. With further optimization in the porosity of cathode support and introduction of more active cathode functional layer, the cell performance will be enhanced.