The oxygen electro-reduction properties of various platinum alloys were studied using a combinatorial high throughput method. Binary and ternary platinum alloys were fabricated using a multi-source physical vapor deposition system and the resulting thin film samples were electrochemically screened by the hydrodynamic rotating disk electrode technique. By comparing the activity-stability-composition relationship between these alloys and a pure platinum film, over 10 alloy catalyst candidates were identified with mass-fraction specific activities of 5 to 10 times that of pure platinum. Additionally, organometallic synthesis methods have been studied to synthesize carbon supported alloy nanoparticles. A good relationship of the molecular oxygen electro-reduction has been found between alloy thin film and powder catalysts.