Electrical and Oxidation Resistance of Surface Oxide of Porous Fe-Cr-Al Alloy for the Application of Metal Supported SOFCs

摘要

We have investigated the property of Fe-Cr-Al-type stainless steel as a porous alloy substrate for metal-supported SOFCs especially on the cathode side. We confirmed not only good heat resistance but also low electrical resistance at the interface between the porous substrate and a La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_3 (LSCF) coating at 700°C in air. Long-term durability of the oxidation resistance of the LSCF-coated Fe-Cr-Al alloy at 700°C was investigated by measuring the mass gain, surface oxide thickness, and electrical resistance at different temperatures from 700 to 900°C.