Research / 2020 / Article / Fig 4

Research Article

Concentration-Dependent Solar Thermochemical CO2/H2O Splitting Performance by Vanadia–Ceria Multiphase Metal Oxide Systems

Figure 4

Chemical analysis of vanadia–ceria systems: XPS spectra of as-prepared vanadia–ceria metal oxide systems in the (a) Ce 3d and (b) V 2P and O 1s regions. (c) Raman spectra of as-prepared pure CeO2, CV25, CV50, CV75, and pure V2O5 samples, where peaks associated with the evolution of surface V2O5 and CeVO4 with increasing V content, are labeled with black and green-colored numbers, respectively. (d) Ce/V ratios in as-prepared and cycled CV25, CV50, and CV75 samples, obtained by ICP-OES analysis.