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Ti–Cu binary films co-sputtered in vacuum are catalytically active for the oxygen reduction in 0.5 M H 2 SO 4 . The activity for the oxygen reduction reaction (ORR) increased with increasing the Cu-content in the Ti–Cu films and it reached to a maximum with the copper composition up to 90 at.%. The constant Tafel slope of ~190 mV/decade which is comparable to that obtained on pure...