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Stepwise anodization of graphene-covered, isolated Pt nanoparticles on FAD55 in 0.1 M H2SO4 electrolyte. (a) Pt 4f spectra acquired with an excitation energy of 600 eV and fit model using Pt0 (green), Ptδ+ (yellow), Pt2+ (blue), and Pt4+ (red) doublets. (b) The according O K-edge spectra.
