Solid　oxide　electrolysis　cells　(SOECs)　have　the　characteristics　of　a　high　efficiency,　cleanliness,　and　environmental　friendliness　and　have　become　one　of　the　important　energy　conversion　methods.　However,　the　coarse　agglomeration　of　Ni　will　affect　the　performance　seriously　and　affect　the　life　of　the　cell.　In　this　study,　we　fabricated　a　Ni-YSZ-supported　microtubule　electrolysis　cell　and　impregnated　SDC　nanoparticles　onto　the　surface　of　Ni-YSZ　electrode　to　change　the　microstructure　of　the　cathode.　At　800　°C,　the　addition　of　SDC　was　beneficial　to　improve　the　electrochemical　reduction　of　CO2.　Compared　with　the　pure　Ni-YSZ　electrode,　after　adding　SDC　particles　to　the　electrode,　the　current　density　increased　by　2　times,　the　current　efficiency　reached　97.7%,　and　the　CO　concentration　in　the　exhaust　gas　was　29.31%.　SOEC　had　good　stability　after　100　h　of　operation,　which　provided　a　new　idea　to　design　the　improvement　of　the　electrode　microstructure.　©　2022　American　Chemical　Society.　All　rights　reserved.