During　start-up　and　shut-down　operations　of　fuel　cells,　high　potential　is　inevitably　experienced　at　cathode,　which　leads　to　the　deterioration　of　the　oxygen　reduction　electrocatalyst.　The　design　of　catalysts　that　can　repair　themselves　under　severe　conditions　has　been　identified　as　a　primary　challenge　for　fuel　cells.　Herein,　self-supported　PdAuCu　branched　nanostructure　is　synthesized　by　a　hydrothermal　method.　By　smartly　utilizing　the　high-potential　treatment,　the　activity　of　PdAuCu　is　significantly　enhanced　owing　to　the　synergistic　effect　between　the　Pd　and　Cu-II　generated　by　such　treatment.　Moreover,　the　high　activity　of　PdAuCu　can　be　well　maintained　by　repeating　the　high-potential　treatment.　We　hence　propose　this　catalyst　as　a　self-repairing　catalyst　in　a　broad　sense.