Current Collect Properties in Micro Tubular Solid Oxide Fuel Cell (2) (Investigation of Cathode Current Collecting Method)

Abstract

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, (Ce_0.6La_0.4)O_1.8 and La_0.8Sr_0.2Ga_0.8Mg_0.2O_2.8 double layer electrolyte, and La_0.6Sr_0.4Co_0.2Fe_0.8O₃ 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.