Fig. 1

(a) XRD patterns of the films: CNC, WO₃/CNC 1/10, CeO₂/CNC 1/10 (*asterisks mark reflections of CeO₂) and CeO₂/WO₃/CNC (1/1/10). (b) Fragments of FTIR spectra of the CNC (upper), CeO₂/CNC 1/10 (middle), and WO₃/CNC 1/10 (lower) films. (c) SEM image of the CeO₂/WO₃/CNC (1/1/10) film and distributions of Ce and W elements.