Comment on: “Influence of the calcination temperature on the structure and reducibility of nanoceria obtained from crystalline Ce(OH)CO3 precursor,” by Poggio et al., Int J Hydrogen Energy 2011;36:15899–15905

In this comment I point out that the electronic structure of CeO2 and Ce2O3 oxides and the physical principles which govern their photoemission should be properly taken into account to peak fit their XPS Ce3d spectra.