Fig. 2. Normalized XPS spectra of ZnRh2O4/Ag/Bi4V2O11 (black lines), Pt/ZnRh2O4/Ag/Bi4V2O11 (red lines), and Ag/ZnRh2O4/Ag/Bi4V2O11 (blue lines) for Bi 4f (a), V 2p (b), Zn 2p (c), Rh 3d (d), Ag 3d (e), and Pt 4f (f). All spectra were calibrated with the C 1s peak, which was derived from a surface-contaminant hydrocarbon with a binding energy of 284.5 eV.
