| Abstract Scope |
Solid oxide fuel cells (SOFCs) are a very energy efficient energy generation technology and, due to their high operating temperature, various fuel sources can be used. However, because of that high temperature operation, interconnect materials are subject to chromium evaporation that can lead to cathode poisoning. To mitigate this issue, an alumina coating and a (Mn, Co)3O4-CeO spinel coating were developed at PNNL. The alumina coating provides an electrically nonconductive stable coating, and the spinel coating provides an electrically conductive and stable coating on the stack interconnects. However, the Mn-Co-O spinel contains Co, which is a relatively expensive material. Hence, if a cheaper element can be substituted, it could substantially reduce manufacturing cost. This paper summarizes recent efforts to replace Co with Ni or Cu. |