Effect of La0.1Sr0.9Co0.5Mn0.5O3−δ protective coating layer on the performance of La0.6Sr0.4Co0.8Fe0.2O3−δ solid oxide fuel cell cathode

► A new and novel La0.1Sr0.9Co0.5Mn0.5O3−δ (LSCM) protective layer was coated on Crofer22H. ► The results show that high conductivity oxides, including SrCrO3, LaCrO4, Mn1.5CrO4, and (Mn,Co)Cr2O4 were formed and prevent the formation of large quantities of low conductivity Cr3O4, (Mn0.98Fe0.02)(Mn0.02Fe0.48Cr1.5)O4, and (Fe,Cr)2O3. ► The resistance to oxygen charge transfer and oxygen ion diffusion by the LSCF cathode contacting LSCM/Crofer22H at 800 °C was significantly lower than that of LSCF contacting with Crofer22H, especially in the lower temperature range of 600-700 °C. ► These results demonstrate that the LSCM protective coating prevents LSCF cathode poisoning by Cr evaporated from the Corfer22H interconnects.