Platinum-group-metal-based　alloy　nanocrystals　have　been　considered　as　the　most　efficient　catalysts　for　oxygen　reduction　reaction　(ORR).　However,　the　poor　stability　issues　limit　their　further　deployment　in　industrialization.　Tungsten　oxide　(WO3)　has　received　attention　due　to　its　intrinsic　electrochemical　stability　and　proton　absorption/desorption　capability.　In　this　work,　we　prepared　PtCuNi/WO3/C　hybrid　catalyst　with　inter-diffusive　alloy/WO3　interface　on　carbon.　The　catalyst　exhibits　enhanced　activity　and　stability　associated　with　the　WO3　content.　The　characterization　results　suggest　that　the　increased　activity　originates　from　the　complementary　proton　supply　of　non-stoichiometric　HxWO3.　Moreover,　WO3　prevents　the　particle　from　dissolution　and　detachment　under　vigorous　electrochemical　polarizations.　The　enhanced　stability　originates　from　the　electronic　interaction　established　between　Pt　and　W.　This　work　provides　new　strategies　to　design　high-performance　ORR　catalysts　by　taking　the　merits　of　WO3.　©　The　Nonferrous　Metals　Society　of　China　2023.