High temperature oxidation behavior of interconnect coated with LSCF and LSM for solid oxide fuel cell by screen printing

摘要

The current study examined the effect of La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_3 (LSCF) and La_(0.7)Sr_(0.3)MnO_3 (LSM) coatings on the electrical properties and oxidation resistance of Crofer22 APU at 800 "C hot air. LSCF and LSM were coated on Crofer22 APU by screen printing and sintered over temperatures ranging from 1000 to 1100 ℃ in N_2. The coated alloy was first checked for compositions, morphology and interface conditions and then treated in a simulated oxidizing environment at 800 ℃ for 200 h. After measuring the long-term electrical resistance, the area specific resistance (ASR) at 800 ℃ for the alloy coated with LSCF was less than its counterpart coated with LSM. This work used LSCF coating as a metallic interconnect to reduce working temperature for the solid oxide fuel cell.