Ferritic Steel Interconnect for Reduced Temperature SOFC

Abstract

Fe-Cr model alloys with variations in chromium content and additions of different reactive elements were studied for potential application in reduced temperature solid oxide fuel cells (SOFC). The oxidation resistance in both, anode and cathode atmospheres at 800°C were determined. Additionally, in-situ studies were carried out to characterize the high temperature conductivity of the oxide scales formed under these conditions. Based on these results, two model steels and a commercial ferritic steel were selected for further studies. Initial investigations of oxide scale formation, oxide conductivity, formation of volatile species, thermal expansion coefficient and compatibility with contact materials showed that these steels are potentially suitable as construction materials for the SOFC interconnect.