FERRITIC STAINLESS STEEL SOFC INTERCONNECTS WITH THERMALLY GROWN (Mn,Co){sub}3O{sub}4 SPINEL PROTECTION LAYERS

摘要

To protect solid oxide fuel cells (SOFCs) from chromium poisoning and improve metallic interconnect stability, manganese cobaltite spinel protection layers with a nominal composition of Mn{sub}(1.5)Co{sub}(1.5)O{sub}4 were thermally grown on ferritic stainless steels. Thermal, electrical and electrochemical investigations indicated that the spinel protection layers not only significantly decreased the contact resistance, but also effectively acted as a mass barrier to both the oxygen inward and the chromium outward diffusion. A long-term thermal cycling test demonstrated excellent structural and thermomechanical stability of these spinel protection layers.