Fig. 2From: Surface Proton Conduction of Sm-Doped CeO2-δ Thin Film Preferentially Grown on Al2O3 (0001)a Ce 3d XAS spectrum of the as-deposited SDC thin film. The labels on-1, on-2, and on-3 indicate the excitation energies for the resonant PES measurements. b Resonant PES spectra of the as-deposited and wet-annealed SDC thin films measured at on-1, on-2, and on-3 in a. The green and blue curves are the Ce3+ and Ce4+ states, respectively, obtained from Gaussian fittingBack to article page