Two anode-supported tubular solid oxide fuel cells (SOFCs) have been connected by a co-sintered ceramic interconnector to form a stack. This novel bilayered ceramic interconnector consists of La-doped SrTiO(3) (La(0.4)Sr(0.6)TiO(3)) and Sr-doped lanthanum manganite (La(0.8)Sr(0.2)MnO(3)), which is fabricated by co-sintering with green anode at 1380 degrees C for 3 h. La(0.4)Sr(0.6)TiO(3) (LST) acts as a barrier avoiding the outward diffusion of H(2) to the cathode; while La(0.8)Sr(0.2)MnO(3) (LSM) prevents O(2) from diffusing inward to the anode. The compatibility of LST and LSM, as well as their microstructure which co-sintered with anode are both studied. The resistances between anode and LST/LSM interconnector at different temperatures are determined by AC impedance spectra. The results have showed that the bilayered LST/LSM is adequate for SOFC interconnector application. The active area is 2 cm(2) for interconnector and 16 cm(2) for the total cathode of the stack. When operating at 900 degrees C, 850 degrees C, 800 degrees C with H(2) as fuel and O(2) as oxidant, the maximum power density of the stack are 353 mW cm(-2), 285 mW cm(-2) and 237.5 mW cm(-2), respectively, i.e., approximately 80% power output efficiency can be achieved compared with the total of the two single cells. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.