In　the　present　work,　we　synthesize　ternary　PtAuCu　nanoparticles　supported　on　carbon　by　a　sequent　galvanic　displacement　method　and　study　the　relationship　between　the　structure　and　properties.　X-ray　diffraction　(XRD)　and　high-resolution　transmission　electron　microscopy　(HRTEM)　reveal　that　PtAuCu　displays　a　compressive　lattice,　and　X-ray　photoelectron　spectroscopy　(XPS)　also　presents　an　altered　electronic　environment.　After　electrochemical　dealloying,　a　rich　PtAu　skin　is　exposed　on　the　surface　of　the　PtAuCu.　With　the　changes　in　the　geometric,　electronic　and　surface　structure,　the　PtAuCu　electrocatalyst　shows　an　enhancement　in　ORR　and　MOR　activity,　as　well　as　an　improvement　in　their　stability.　The　Pt10Au10Cu64/C　catalyst　exhibits　a　Pt　mass　activity　of　0.376　Amg(Pt)　(1)　at　0.85V　for　the　ORR,　which　is　2.22　times　higher　than　that　of　Pt/C,　and　the　current　density　at　0.8　V　for　the　MOR　is　4.43　times　higher　than　that　of　Pt/C.　Furthermore,　Pt10Au3Cu44/C　exhibits　superior　stability　for　the　ORR,　with　a　mass　activity　loss　of　only　7.25%　after　3000　cycles,　whereas　Pt/C　exhibits　a　48.82%　loss　under　the　same　conditions.　(C)　2016　Elsevier　Ltd.　All　rights　reserved.