Nanofibers　have　great　promise　as　a　highly　active　air　electrode　for　reversible　solid　oxide　cells　(ReSOCs);　however,　one　thorny　issue　is　how　to　adhesively　stick　nanofibers　to　electrolyte　with　no　damage　to　the　original　morphology.　Herein,　PrBa0.8Ca0.2Co2O5+δ　(PBCC)　nanofibers　are　applied　as　an　air　electrode　by　a　facile　direct　assembly　approach　that　leads　to　the　retention　of　most　of　the　unique　microstructure　of　nanofibers,　and　firm　adhesion　of　the　nanofiber　electrode　onto　the　electrolyte　is　achieved　by　applying　electrochemical　polarization.　A　single　cell　with　the　PBCC　nanofiber　air　electrode　exhibits　excellent　maximum　power　density　(1.97　W　cm-2),　electrolysis　performance　(1.3　A　cm-2　at　1.3　V),　and　operating　stability　at　750　°C　for　200　h.　These　findings　provide　a　facile　means　for　the　utilization　of　nanofiber　electrodes　for　high-performance　and　durable　ReSOCs.　©　2023　American　Chemical　Society.