A flat tubular segmented in series (SIS)-SOFC was fabricated with variable cathode thicknesses and the performance characteristics were analyzed. Vacuum slurry dip coating and screen printing technique were employed to coat the NiO-Ce(1)ScSZ(10) anode, Ce(1)ScSZ(10) electrolyte, and La0.6Sr0.4Co0.2Fe0.8 cathode on the extruded 3YSZ ceramic support. A sub module consisting of 5-cell with a total active electrode area of 4 cm(2) was interconnected in series using Ag-glass composite. Electrochemical performance analysis was conducted between 600 and 800 degrees C using 300 CC/min. 3 vol.% humidified hydrogen fuel and 1500 CC/mm air as oxidant. The results obtained from electrochemical impedance spectroscopy and current voltage polarization curves revealed a 57 mu m thick cathode layer as the optimum thickness. An application of LSCo as the cathode current collector on the surface of the cathode enhanced the performance by approximately 30% at 750 degrees C. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.