Figure 2.
XP spectra (Au 4 f levels) of Au/CeO2. Left: after O400 (a,c) and H400 (b,d) pretreatments; (right) after CO oxidation. Peaks in red, green, blue: Au0, Au1+, Au3+ species. Reprinted with permission from Ref. [38] © 2016, Elsevier Inc.
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