Research on the Properties of Solid Oxide Fuel Cells Based on Composite Cathode of YBaCo_1.4Cu_0.6-O_5+δ-xSDC

The new type of cathode material YBaCo1.4Cu0.6-O5+δ-xSDC (x = 20, 30, 40, 50 wt.%) was synthesized by sol-gel method, electrolyte material of Ce0.8Sm0.2O1.9 (SDC) and La0.9Sr0.1Ga0.8Mg0.2O3-δ (LSGM) were synthesized by glycine combustion, composite cathode materials were prepared by mixing the two materials evenly. The performance was analyzed using the ac impedance spectrum and SEM, the best performance was obtained with the ratio of x = 30%. After 2 hour sintering at 950 °C, YBCC-30%SDC cathode polarization resistance are 0.027 Ω · cm2, 0.043 Ω · cm2 and 0.074 Ω · cm2 at 850 °C, 800 °C, 750 °C, respectively. The performance of single battery YBCC-30SDC/LSGM/SDC/NiO-SDC was tested and the power density reached its maximum of 662 mW/cm2 at 850 °C.