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

Abstract

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 BaYMn₂O_5+δ was shown to rapidly and reversibly store and release oxygen with unprecedented kinetics. In this work, four double perovskite materials, BaLaFe₂O_5+δ, BaLaCo₂O_5+δ, BaYCo₂O_5+δ, and BaYFe₂O_5+δ, 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.