Fig. 3: X-ray reflectivity results.
From: Platinum oxide formation under oxygen evolution reaction conditions
A X-ray reflectivity data (gray) and the corresponding fits (colored lines) showing the changes due to the formation of an oxide layer. For clarity, the data are divided by q−4 and vertically offset. B Electron density profiles determined from the XRR fit results, indicating an increase in both the oxide thickness as well as the roughness of the Pt-oxide and oxide-water interfaces with increasing potential. A full overview of the fit parameter values is provided in Fig. S8. The inset shows a comparison of the amount of oxide as determined via XRR (red), RDE-SXRD (blue), and the oxide reduction charge (gray) determined by Conway and Jerkiewicz35. Potentials are corrected for the full ohmic resistance of the electrolyte (150 ± 10 Ω and 33 ± 2 Ω for the RDE-SXRD and XRR experiments, respectively, see “Methods”). Source data are provided as a Source data file.
