In Situ Densification of Gadolinium-Doped Ceria Interlayer by Infiltration Process in SOFC

Abstract

Gadolinium-doped ceria (GDC) interlayer is commonly inserted between electrolyte yttria-stabilized zirconia (YSZ) and cathode La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) to prevent the Sr migration from cathode to electrolyte and improve the stability of the solid oxide fuel cell (SOFC). However, it is difficult to make a dense GDC interlayer during the traditional process. Co, Gd and Ce nitrates solution is used as the infiltration solution to modify and in situ densify the GDC interlayer in this study. The GDC interlayer shows high density when it is pre-sintered at 1175°C and final sintered at 1300°C, and the cell shows high performance and stability, the voltage has little degradation after running for 100 hours at 800°C and 0.5Acm-2, Sr is not observed at the YSZ/GDC interface.