Current collecting property in micro tubular solid oxide fuel cell (SOFC) was evaluated by using electrochemical impedance spectroscopy. A micro tubular cell was composed of NiO/(ZrO2)0.9(Y2O3)0.1 anode-substrate, (Ce0.6La0.4)O1.8 and La0.8Sr0.2Ga0.8Mg0.2O2.8 double layer electrolyte, and La0.6Sr0.4Co0.2Fe0.8O3 cathode. The effects of different current collecting types, i.e., short-current path or long-current path were discussed. These results were simulated to the equivalent circuit consisting of four resistances and three capacitances, and accuracy of these estimated values were investigated in nonlinear least square techniques. As the results, short-current path type showed high performance and ohmic resistance was dependent of current collect types.
