Early studies, primarily focused on low-index platinum surfaces in ultra-high vacuum (UHV) conditions agreed that atomic oxygen binds on Pt(111) forming a (2x2)-O structure at low temperature, with some persistence at higher temperature. These studies also indicated that molecular oxygen is unlikely to be present on Pt(111) at room temperature. Platinum catalysts can undergo oxidation even at low pressures, inducing modification of electronic properties and structural changes, such as surface buckling. Recent in-situ studies have advanced our understanding by investigating platinum oxidation under near-ambient pressure conditions for longer exposure times. Fantauzzi et al. reported the oxidation of Pt(111) up to 3 monolayers (ML) through a combination of experimental and theoretical approaches. Furthermore, a study on stepped platinum surfaces revealed the formation of platinum-oxide nanoclusters at a pressure of 1 Torr. Finally, an in-situ study by Ellinger et al. at a partial pressure of 500 mbar and high temperature showed the growth of two atomic layers of bulk-like platinum oxide.