Solid　oxide　fuel　cells,　one　of　the　most　efficient　energy　conversion　devices,　are　prone　to　performance　degradation　induced　by　cation　surface　segregation　and　chromium　poisoning　of　cathodes.　Herein,　we　enhance　the　chromium-tolerance　of　La0.6Sr0.4Co0.2Fe0.8O3-delta　(LSCF)　cathode　by　the　regulation　of　surface　strains　through　modification　with　a　nanoscale,　dual-phase　coating.　The　coating　is　composed　of　a　nanoscale　BaCoO3_delta　conformal　film　and　BaCeO3　nanoparticles,　and　the　strong　interactions　at　BaCoO3_delta/LSCF　and　BaCeO3/LSCF　heterointerfaces　impose　a　compressive　strain　on　the　LSCF　scaffold.　The　strain　effect　significantly　suppresses　the　strontium　surface　segregation　and　thus　mitigates　the　chromium　attack　on　the　cathode.　Further,　the　microstructural　and　phase　stabilities　of　the　coating　in　volatile　chromium　environment　also　contribute　to　the　long-term　operational　stability　of　the　modified　LSCF　cathode.　A　single　cell　with　the　modified　LSCF　cathode　demonstrates　an　excellent　peak　power　density　of　1.46　W　cm_　2　at　750　degrees　C　and　remarkable　chromium-durability　in　wet　air.　This　work　opens　up　a　new　route　for　suppressing　strontium　surface　segregation　and　chromium-poisoning　of　the　cathodes.