LAUSR

Abstract The BaCo0.7Nb0.2Ta0.1O3−δ (BCNT) perovskite-type oxide was prepared by the conventional solid phase reaction method as a potential electrocatalyst for the oxygen reduction reaction. Its electrochemical properties were characterized. The results indicated that the BCNT oxide sintered at 1100 °C for 10 h had formed a single-phase cubic perovskite structure. And the BCNT–Sm0.2Ce0.8O1.9 (SDC) mixture co-sintered at the same conditions showed good chemical compatibility and stability between BCNT and SDC. The BCNT cathode sintered at 1000 °C for 4 h on SDC electrolyte exhibited the lowest the polarization resistance (about 0.0495 Ω·cm2 at 800 °C). Moreover, with a 351 μm-thick SDC as electrolyte and BCNT as the cathode, maximum power densities of the single cell reached 466.81 and 626.41 mW·cm−2 at 750 and 800 °C, respectively, and the corresponding total interface polarization resistance of the cell were 0.0913 Ω·cm2 and 0.0552 Ω·cm2. Short-term stability of the cell showed that the cell was quite stable at 750 °C for 15 h. This suggested that BCNT was a very promising cathode material for IT-SOFCs.