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

Abstract

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 20×10−6K−1. The electrical conductivity are 7.4–10.7Scm−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, 0.065Ωcm2 at 800, 750, 700°C, respectively. Maximum power density is 664mWcm−2 at 800°C. The encouraging results promise BBCT as an alternative cathode material for IT-SOFCs.