Screen-printing technology was developed to fabricate Ce 0.8 Sm 0.2 O 1.9 (SDC) electrolyte films onto porous NiO–SDC green anode substrates. After sintering at 1400°C for 4h, a gas-tight SDC film with a thickness of 12μm was obtained. A novel cathode material of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ was subsequently applied onto the sintered SDC electrolyte film also by screen-printing and sintered at 970°C for 3h to get a single cell. A fuel cell of Ni–SDC/SDC (12μm)/Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ provides the maximum power densities of 1280, 1080, 670, 370, 180 and 73mWcm −2 at 650, 600, 555, 505, 455 and 405°C, respectively, using hydrogen as fuel and stationary air as oxidant. When dry methane was used as fuel, the maximum power densities are 876, 568, 346 and 114mWcm −2 at 650, 600, 555 and 505°C, respectively. The present fuel cell shows excellent performance at lowered temperatures.