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The O₂ dissociative adsorption serves as a pivotal criterion for assessing the efficacy of oxygen reduction catalysts. We conducted a systematic investigation into O₂ dissociative adsorption on the Pt-skin Pt₃Cu(111) surface by means of the density functional theory (DFT). The computational findings reveal that the O₂ adsorption on Pt-skin Pt₃Cu(111) surface exhibits comparatively lower stability when contrasted with that on the Pt(111) surface. For O₂ dissociation, two paths have been identified. One progresses from the t-f-b state towards the generation of two oxygen atoms situated within nearest-neighbour hcp sites. The other commences from the t-b-t state, leading to the generation of two oxygen atoms occupying nearest-neighbour fcc sites. Moreover, the analysis of the energy barrier associated with O₂ dissociation indicates that O₂ on the Pt-skin Pt₃Cu(111) surface is more difficult to dissociate than on the Pt(111) surface. This study can offer a valuable guide for the practical application of high-performance oxygen reduction catalysts.