The onset potential of oxidation is found to be slightly higher than 0.8 V, in reasonable agreement with the existing literature. The oxygen ratio then steadily increases until 1.06 V where it raises sharply. This sudden surge is mathematically explained by the plateauing behavior of the Gibbs energy at high oxygen ratios in Figure . This sharp rise, along with the decreasing lateral coefficient indicates the formation of a more stable oxide-like phase. At this point, our thermodynamic model is less relevant, and the system is most likely governed by kinetic effects. These findings align closely with the in-situ X-ray absorption spectroscopy experiments conducted by Teliska et al. . Their study of platinum particles ranging from 1.5-2.5 nm, comparable to our modeled 2.2 nm particle, revealed significant changes in oxygen interactions with platinum around 1.05 V vs. RHE. Specifically, the authors observed a shift in the X-ray absorption spectra, indicating a transition from surface-adsorbed oxygen to a more incorporated form, possibly involving oxide formation. Furthermore, their EXAFS data indicated changes in Pt-Pt coordination starting at about 0.90 V, which they attributed to the onset of subsurface oxygen formation. This also corroborates with our computational observations of subsurface oxygen emergence at approximately 0.90 V. This structural reorganization occurring close to 1.05 V is often termed "place-exchange" and has also been reported to occur for Pt(111). The reported potential of place-exchange is close to the onset potential of the ORR on platinum-based catalysts, suggesting a connection between the formation of a stable oxide-like phase close to 1.06 V and the overpotential of the ORR on Pt catalysts.