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Survey XPS spectrum of (a) CA/CeNPs, (b) CA/CeNPs/Pt5, and high resolution Ce 3d XPS spectrum of (c) CA/CePrec and (d) CA/CeNPs/Pt5 (red dashes for Ce4+ and blue dashes for Ce3+). High resolution XPS spectra of platinum (Pt 4f) in the (e) CA/CeNPs/Pt1 and (f) CA/CeNPs/Pt5.
