The fuel cell performance of the anode supported cell with doped infiltrated composite cathode, Ni-YSZ anode, and YSZ electrolyte was examined in the temperature range . The cell performance was improved by infiltrating the nanoparticle solid solution into the porous LSM-YSZ cathode. The power density of the cell with the LSM-LSZ cathode was enhanced from to at 0.7 V and by infiltration of . The improvement of the power density was explained by decreasing the electrode resistance for oxygen reduction on the cathode. No significant degradation of the power density was observed within 200 h at and 0.7 V.