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The synthesis of catalysts in the lab is typically limited to low mass quantities, and it makes the large quantity production of catalysts a challenge. The High Energy Ball Milling technique allows for the processing of more massive amounts. In this work, we prepared CuPt nanoparticles, and their oxygen reduction catalytic activity was evaluated. The nanoparticles were prepared by galvanic displacement of Cu coming from a High Energy Ball Milling process. Alumina from the wear of the milling vials was present in the catalyst. Hydrodynamic curves from rotating-disk electrode measurements showed a catalytic activity seven times higher on the alloy than that observed on platinum-loaded carbon black. The catalytic activity was not negatively affected by the presence of the Al2O3 impurities.