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The catalytic efficiency of oxygen reduction catalysts is notably influenced by the dissociative adsorption of O₂. We conducted a systematic investigation into the dissociative adsorption of O₂ on the Ag₃Au(111) surface using ab initio density functional theory (DFT) calculations. Our computational findings indicate that adsorption the configuration designated t-b-t exhibits favorable energetics on the Ag₃Au(111) surface. Regarding the dissociation of O₂, we identified a reasonable dissociation pathway, which proceeds from the initial t-b-t state to the creation of two oxygen atoms that occupy a set of neighboring fcc sites. Furthermore, our analysis indicates that the adsorption of O₂ on the Ag₃Au(111) surface is less favored thermodynamically and more difficult to dissociate than that on the Ag(111) surface. This study furnishes a theoretical framework elucidating the prospective utilization of Ag-Au alloy in the capacity of oxygen reduction catalysts.