摘要
Lanthanum-based iron- and cobalt-containing perovskite has a high potential as a cathode material because of its high electro-catalytic activity at a relatively low operating temperature in solid oxide fuel cells (SOFCs) (600-800). To enhance the electro-catalytic reduction of oxidants on La0.6Sr0.4Co0.2Fe0.8O3鈭?em>未 (LSCF), Ga doped ceria (Ce0.9Gd0.1O1.95, GDC) supported LSCF (15LSCF/GDC) is successfully fabricated using an impregnation method with a ratio of 15 wt%LSCF and 85 wt%GDC. The cathodic polarization resistances of 15LSCF/GDC are 0.015 惟 cm2, 0.03 惟 cm2, 0.11 惟 cm2, and 0.37 惟 cm2 at 800 掳C, 750 掳C, 700 掳C, and 650 掳C, respectively. The simply mixed composite cathode with LSCF and GDC of the same compositions shows 0.05 惟 cm2, 0.2 惟 cm2, 0.56 惟 cm2, and 1.20 惟 cm2 at 800 掳C, 750 掳C, 700 掳C, and 650 掳C, respectively. The fuel cell performance of the SOFC with 15LSCF/GDC shows maximum power densities of 1.45 W cm鈭?, 1.2 W cm鈭?, and 0.8 W cm鈭? at 780 掳C, 730 掳C, and 680 掳C, respectively. GDC supported LSCF (15LSCF/GDC) shows a higher fuel cell performance with small compositions of LSCF due to the extension of triple phase boundaries and effective building of an electronic path.