Sr　doping　is　a　common　strategy　to　enhance　the　electrocatalytic　activity　of　perovskite　cathode　materials　of　solid　oxide　fuel　cells　(SOFCs),　but　the　tendency　of　Sr　surface　segregation,　chemical　incompatibility　with　yttria-stabilized　zirconia　(YSZ)　and　interaction　with　volatile　contaminants　such　as　chromium　in　SOFC　stacks　lead　to　a　loss　of　long-term　cell　performance.　Herein,　a　Sr-free　and　Pd-doped　La0.95Co0.19Fe0.76Pd0.05O3-delta　(LCFPd)　cathode　is　directly　assembled　on　a　barrier-layer-free　YSZ　electrolyte　cell　without　conventional　high　temperature　pre-sintering.　The　cell　with　the　directly　assembled　LCFPd-GDC　(gadolinium-doped　ceria)　composite　cathode　exhibits　a　peak　power　density　of　1035　mW　cm　2　and　excellent　operation　stability　at　750　degrees　C　for　200　h.　Cathodic　polarization　significantly　enhances　the　electrode/electrolyte　interface　contact,　indicated　by　the　substantial　decrease　of　cell　ohmic　resistance　from　0.28　Omega　cm(2)　to　0.14　Omega　cm(2)　after　polarization　at　500　mA　cm(-2)　and　750　degrees　C　for　120　h.　Detailed　elemental　analysis　indicates　that　doped　Pd　could　be　segregated　on　the　electrode　surface　under　fuel　cell　operation　conditions,　which　significantly　enhances　the　electrocatalytic　activity　for　the　O-2　reduction　reaction.　This　study　provides　new　strategy　to　develop　cobaltite　based　perovskite　materials　directly　on　YSZ　electrolyte.