Low Temperature Solid Oxide Fuel Cells with SDC-Carbonate Electrolytes

摘要

Composites consisting of Ce0.8Sm0.2O1.9 (SDC)-carbonate were developed as electrolytes for low temperature solid oxide fuel cells (LTSOFC).The SDC power was prepared by sol-gel method.The carbonates were binary eutectics of (Li/Na)2CO3,(Li/K)2CO3 and (K/Na)2CO3.Conductivity measurements showed that the conductivities were depended on the type of carbonates.Discontinuities were found in the Arrhenius plots for both SDC-(Li/Na)2CO3 and SDC-(Li/K)2CO3.For SDC-(Na/K)2CO3 composite electrolyte,the conductivity increased as temperature rose following one slope.Single cells based on various composites were fabricated by a uniaxial die-press method and tested at 450-600 °C.The results showed all cells exhibited improved performances upon that of pure SDC-based cell.The best power density of 532 mW cm-2 at 600 °C was achieved for LTSOFC using composite of SDC and (Li/Na)2CO3.Conductivity mechanism was also discussed.