Co-doped La0.2Sr0.8TiO3 as a Possible Anode for the LaGaO3-based Solid Oxide Fuel Cell

Co-doped La0.2Sr0.8TiO3 (LST) was tested as a possible anode on La0.9Sr0.1Ga0.8Mg0.2O3-delta (LSGM) electrolyte. In order to improve the anodic performance, various amount of Co (1, 2, 4, 8 mol%) was doped into the LST. The performance was examined at 600 degrees C by measuring impedance of the electrolyte-supported, symmetric single cells. The polarization resistance (R-p) of electrode was minimum for 2 mol% Co-doped LST (LSTC) at 600 degrees C in 5% H-2+95% Ar. While the Rp value of LST anode increased similar to 1.6 times after 8 h, the R-p value of 1-2 mol% Co-doped LST was stable with time. A single cell with Ni-impregnated LSTC-GDC composite as an anode, Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) as a cathode and LSGM as an electrolyte exhibited the maximum power density of similar to 250mW/cm(2) at 800 degrees C. In addition, Co-doped LST anode showed very stable performance with time in two-chamber condition. Thus, Ni-impregnated LSTC-GDC composite is a promising anode for LaGaO3-based SOFC.