Due　to　their　excellent　high　Faraday　efficiency,　perovskite　solid　oxide　cells　(SOECs)　have　attracted　considerable　attention.　Nevertheless,　they　still　face　significant　challenges　in　terms　of　stability　and　electrocatalytic　activity　during　CO₂　electrolysis.　In　this　study,　Ni　particles　in　La0.65Ba0.35Mn1-xNixO3-δ　are　successfully　separated　by　a　unique　in-situ　exsolved　method　of　metal　nanoparticles,　which　are　uniformly　anchored　to　the　electrode　surface　as　Ni　nanometal　particles.　This　effectively　suppresses　the　generation　of　carbon　deposits　on　the　cathode　surface.　Under　test　conditions　of　850　°C,　1.6　V　and　50　sccm　flow　rate,　the　CO　yield　of　the　modified　cathode　material　reached　5.9　mL　min−1　cm−2,　which　is　nearly　four　times　higher　than　that　before　doping.　The　synergistic　effect　of　in-situ　exsolution　of　Ni　metal　nanoparticles　with　oxygen　defects　generated　by　the　perovskite,　creating　more　active　locations　for　CO2　adsorption　and　electrolysis,　is　responsible　for　the　significant　improvement　in　electrochemical　performance.　This　work　provides　new　strategies　and　ideas　for　the　development　of　efficient　and　durable　SOEC　cathode　materials.　©　2024　Elsevier　B.V.