Novel BaBi0.05Co0.8Ta0.15O3−δ cathode material for intermediate temperature solid oxide fuel cells

Cathode material BaBi0.05Co0.8Ta0.15O3−δ (BBCT) was synthesized by a solid-state reaction for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The X-ray techniques had been used for structural characterizations. BBCT forms a pure cubic perovskite structure and exhibits chemical compatibility with the La0.9Sr0.1Ga0.8Mg0.2O3−δ (LSGM) electrolyte. The thermal expansion coefficient (TEC) of the BBCT is 20 × 10−6 K−1. The electrical conductivity are 7.4-10.7 S cm−1 in the temperature range of 600-800 °C in ambient air. The polarization resistance (RP) of BBCT cathode on LSGM electrolyte is 0.023, 0.036, 0.065 Ω cm2 at 800, 750, 700 °C, respectively. Maximum power density is 664 mW cm−2 at 800 °C. The encouraging results promise BBCT as an alternative cathode material for IT-SOFCs.