EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

Solid oxide cells (SOCs) have been considered as attractive energy conversion devices because of quiet operation, fuel flexibility, and low emissions. Their efficiency is often limited by the air electrode performance, so various kinds of highly electrocatalytically-active materials have been proposed, most of them being Co-based perovskite-type oxides. However, copper-based oxides have attracted recently more and more attention, due to lower costs, mitigation from carcinogenic Co, and possibly improved compatibility with solid electrolytes. The proposed in this work novel La1.5Ba1.5Cu3O7±δ material was synthesized through both, sol-gel and solid-state methods. The compound demonstrated layered crystal structure with P4/mmm symmetry, which indicates favorably-high electronic and oxygen ion conductivity. In addition, a relatively low thermal expansion coefficients were calculated from structural parameters dependence on temperature, ranging from 13,7·10^-6 K-1 at 25-400 °C to 18,3·10^-6 K-1 at 500-900 °C, and confirmed by dilatometry to be ca. 15.5·10^-6 K-1. The thermogravimetric results revealed that the oxygen content in La1.5Ba1.5Cu3O7±δ is around 7.1 at room temperature, and decreases to 6,6 at 800 °C. Also, in this work application of La1.5Ba1.5Cu3O7±δ for manufacturing of the air electrodes for SOCs is presented, with a particular emphasis on the usage in anode-supported design of the laboratory cells.