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Depth profiling analysis of graphene-covered Pt nanoparticles/layers of various thickness on FAD55 in 0.1 M H2SO4 electrolyte, performed at 1.85 VRHE after a dwell period of at least 10 min. For fitting procedure, see section S2 in the ESI. The fraction of oxidic Pt was taken as the combined Pt2+ and Pt4+ contribution to the fitted spectra.
