Electrodes and performance analysis of a ceria electrolyte SOFC

In the present work, the current–voltage characteristic at 700 °C across a thin film of Ce0.8Gd0.2O1.9 (CGO) was analyzed by local equilibrium theory. The performance of a Ni–Ce0.8Sm0.2O1.9 (CSO20) anode and a La0.6Sr0.4Co0.8Fe0.2O3–Ce0.8Gd0.2O1.9–Ag (LSCF–CGO–Ag) cathode was studied at 500–700 °C by three-probe complex impedance measurements. If the electrodes are used on a thin film of Ce0.8Gd0.2O1.9 (CGO20) electrolyte, the calculation showed that the maximum energy conversion efficiency at 700 °C could reach 0.43, where the power density was 0.62 W/cm2, which is large enough for practical operation.