Durability improvement of large-area anode supported solid oxide fuel cell fabricated by 4-layer sequential co-lamination and co-firing process

Abstract

In this work, thin-film based 4-layered (NiO-YSZ, NiO-ScCeSZ, ScCeSZ, and GDC) anode-supported solid oxide fuel cell (SOFC) with a large-area (12cm × 12 cm) is fabricated by sequential co-lamination and GDC cofiring process to improve the cell durability. This results in a highly dense electrolyte (5–6 μm) and buffer layer (2–3 μm) on the porous anode support. The single cell shows a high-power output of 41.5W at 50A and a maximum power density of 1.6 Wcm−2 at 700 °C. After the current load cycling of 21 times from 25 to 50 A, the large-area cell shows a very small degradation of 0.018V, which is attributed to strong interfacial connectivity between the ScCeSZ electrolyte and GDC buffer layer. Subsequently, the long-term test is carried out for 1000 h at 700 °C under a constant current density of 250 mA/cm2. The cell with a 4-layered structure exhibits the lowest degradation rate of 0.2% kh−1 at 25A current, which satisfies the stringent benchmark of longevity for the commercialization of technology.