A　novel　molten　salt　method　was　employed　to　synthesize　10%　Nb　doped　La0.6Sr0.4FeO3−δ　(LSFN).　The　as-synthesized　powders　were　pure　and　adopted　a　porous　structure.　Using　LSFN　as　the　oxygen　electrode　for　a　reversible　solid　oxide　cell,　the　button　cell　exhibited　a　peak　power　density　of　0.79　W　cm−2　in　H2　and　an　electrolysis　current　density　of　0.89　A　cm−2　at　1.3　V　in　50%　CO2/50%　H2　at　800　°C.　A　large　fraction　of　Fe2+　was　found　in　LSFN,　resulting　in　the　improved　performance.　Our　results　indicate　that　the　molten　salt　method　is　a　promising　approach　for　the　synthesis　of　highly　active　perovskite　electrode　with　a　dopant　of　Nb.　©　2019