Novel perovskite-spinel composite conductive ceramics for SOFC cathode contact layer. (20th December 2018) - Xin, Xianshuang
Abstract: Perovskite-spinel composite conductive ceramics are developed for solid oxide fuel cell (SOFC) cathode contact layer. The precursor of the composite materials includes micron-sized La0.6 Sr0.4 Co0.2 Fe0.8 O3 (LSCF) perovskite particles coated by the reduced nano-sized Mn0.9 Y0.1 Co2 O4 (MYC) spinel material, and then it is sintered in-situ to obtain perovskite-spinel composites. The sintering activity of the composites is enhanced by using the reduced spinel powders. The conductive performance of the composite materials is effectively improved due to the high conductivity of perovskite LSCF particles utilized. Measured at 750 ο C under constant current density of 400 mA/cm 2, after running 200 h, the area specific resistance (ASR) value of cathode contact layer remains relatively stable at around 5.4 mΩ cm 2 . The developed LSCF-MYC composite as cathode contact layer presents good bonding strength with both cathode and interconnection, and shows obviously low contact resistance and high stability. Graphical abstract: Contact layer at cathode side can effectively increase contact area and improve interface conductivity performance and stability of solid oxide fuel cell (SOFC) stack. Novel perovskite-spinel (LSCF-MYC) composite conductive ceramics are developed for SOFC cathode contact layer. Excellent low-temperature sintering activity is obtained by using the reduced spinel powders sintered in-situ. The cathode contact layer presents obviously low contact resistance and good bonding with both cathode and interconnection. It exhibits a promising prospect for the practical application of SOFC. Highlights: Contact layer at cathode side can effectively increase contact area and improve interface conductivity performance. Novel perovskite-spinel composites are developed for solid oxide fuel cell (SOFC) cathode contact layer. Excellent low-temperature sintering activity is obtained by using the reduced spinel powders sintered in-situ. The cathode contact layer presents low contact resistance and good bonding with both cathode and interconnection. The cathode contact layer exhibits a promising prospect for the practical application of SOFC.