Abstract
We synthesize the SmBa0.5Sr0.5Co2O5+δ (SBSC) powders by glycine nitrate combustion method and then design the composite cathodes by mixing with Sm0.2Ce0.8O2-δ (SDC) for thermal expansion mismatch concern. The cell exhibits good adhesion between layers to improve cell performance. The cell with yittria-stabilized zirconia (YSZ) electrolyte via cathode design of SDC | SDC-SBSC, is operated from 600 to 800 °C. The power densities for operation potential 0.7 V shows the acceptable value of 498 mWcm-2 at 800 °C. To evaluate the durability, it is operated under fixed current density over thousand hours. A slight degradation in the activation region can be observed at the initial stage. The degradation rate is estimated at less than 0.5 %/khr after activation with current loading. The operational conditions with lower current loading and higher operation potential are the solution to prolong the cell life time. Further demonstration for IT-SOFC cell product shall be executed.
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