Abstract
The anode-supported solid state fuel cells were fabricated by tape-casting and co-sintering techniques. The effects of Ag-(La 0.8Sr 0.2) 0.95MnO 3 (LSM95) current-collecting layer at the cathode side on the electrochemical stability of anode-supported solid oxide fuel cells were investigated. The assembled cell was electrochemically characterized from 800 to 700 °C with humidified H 2 as fuel and O 2 as oxidant. The open circuit voltages decreased with decreasing temperature which were opposite from the results calculated from the Nernst equation for each temperature, and the values were 1.14, 1.09 and 1.03 V at 800, 750 and 700 °C, respectively. EDX analysis revealed that Ag diffused from the cathode current-collecting layer to the surface of electrolyte which was caused by Ag electromigration under current. The phenomenon of Ag electromigration led to unstable cell performance during long-time operation.
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