Fig. 4From: Surface Proton Conduction of Sm-Doped CeO2-δ Thin Film Preferentially Grown on Al2O3 (0001)a The relative humidity dependence of the wet-annealed SDC thin film and b Cole-Cole plots of the wet-annealed SDC thin film, measured in 100 RH% wet air at 22 °CBack to article page