Microtubular solid oxide fuel cells with a two-layer LSCF/BSCFM5 cathode

Abstract

In this study, we present the development of microtubular solid oxide fuel cells (MT-SOFC) with a two-layer cathode: a composite cathode functional layer (CFL) adjacent to the buffer layer (BL) and a cathode current-collecting layer (CCCL). CFL consists of a mixture of BL material Ce_0.9Sm_0.2O_1.95 (SDC) and perovskite Ba_0.5Sr_0.5Co_0.75Fe_0.2Mo_0.05O_3-δ (BSCFM5), which has a high exchange rate with oxygen. The widely used cathode material La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ (LSCF) with high electrical conductivity was used as the CCCL. A significant increase in the peak power density of the MT-SOFC to 1.2 W/cm² at 850 °C was achieved using the proposed two-layer cathode.