低温陶瓷燃料电池Ni-Fe-CCC复合阳极材料的制备与性能研究

PREPARATION AND CHARACTERIZATION OF Ni-Fe-CCC COMPOSITE FOR LOW-TEMPERATURE CERAMIC FUEL CELL

采用改良的固相反应法制备了n(Ni):n(Fe)分别为8:2、6:4和5:5的Ni-Fe氧化物,然后与组成为70%Ce_(0.8)Sm_(0.2)O_(1.9)(SDC)-30%(0.53Li/0.47Na)_2CO_3的氧化铈-碳酸盐复合物(CCC)按1:1的体积比混合作为以CCC为电解质的低温陶瓷燃料电池的复合阳极材料,并对其微结构、物相和电化学性能进行表征。结果表明:经氢气还原后该复合阳极获得良好的微结构,其中n(Ni):n(Fe)为8:2的复合阳极的孔隙分布最均匀;以氢气为燃料时,采用NiFe-CCC复合阳极和CCC电解质的单电池表现出优异的性能,其中采用n(Ni):n(Fe)为8:2的复合阳极的燃料电池性能最佳,在600℃下输出功率密度高达0.724W·cm^(-2),以甲醇为燃料时,采用该复合阳极的燃料电池在600℃下的输出功率密度达到0.387W·cm^(-2)。

Ni-Fe oxides with the molar ratio of Ni/Fe in 8：2, 6：4 and 5：5 were prepared by a modified solid-state reaction method, and then they were mixed with ceria-carbonate composite （CCC） with the composition of 70%Ce0.8Sm0.2O1.9（SDC）-30%（0.53Li/0.47Na）2CO3 in a volume ratio of 1 ： 1 to act as composite anode materials for lowtemperature ceramic fuel cell with CCC electrolyte. Their microstructure, phase composition and electrochemical performance were characterized. The results show that good microstructure was formed after reduction in hydrogen for all composite anodes, especially for the composite anode with the molar ratio of Ni/Fe in 8 ： 2. Furthermore, excellent output performances were achieved by the single cells with Ni-Fe-CCC composite anode and CCC electrolyte, using hydrogen fuel. Among all composite anodes, the composite anode with the molar ratio of Ni/Fe in 8 ： 2 demonstrated the best cell performance. At 600℃, the maximum power density was 724mW·cm^-2 . With this composite anode, a maximum power density of 387mW·cm^-2 was achieved at 600℃ using methanol fuel.