An experimental and computational investigation of the oxygen storage properties of BaLnFe2O5+δ and BaLnCo2O5+δ (Ln = La, Y) perovskites

One interesting class of materials for oxygen storage applications are double perovskite oxides due to their ability to rapidly store and release oxygen. Previously, the double perovskite BaYMn2O5+delta was shown to rapidly and reversibly store and release oxygen with unprecedented kinetics. In this work, four double perovskite materials, BaLaFe2O5+delta, BaLaCo2O5+delta, BaYCo2O5+delta, and BaYFe2O5+delta, were synthesized and characterized. TGA experimental results for all four samples demonstrate rapid and reversible oxygen storage. The two Fe-containing compounds are the most stable for multiple adsorption/desorption cycles with both nitrogen/air and hydrogen/air at multiple temperatures and have been demonstrated to oxidize methane.