A NOVEL Ba/Nb CO-DOPED (Ba0.15Sr0.85)(Nb0.15Co0.85)O3–δ OXIDE AS AN OXYGEN ADSORBENT: STRUCTURAL AND OXYGEN SORPTION PROPERTIES

Abstract

The novel Ba/Nb co-doped (Ba0.15Sr0.85)(Nb0.15Co0.85)O3–δ oxide was synthesized by the solid-state reaction method. The (Ba0.15Sr0.85)(Nb0.15Co0.85)O3–δ oxide was studied by X-ray diffraction (XRD), differential thermal analysis (DTA) and thermogravimetry (TG). The results demonstrate that the structural stability of the Ba/Nb co-doped (Ba0.15Sr0.85)(Nb0.15Co0.85)O3–δ was improved significantly compared to that of the Ba -doped SrCoO3–δ , in which a phase transformation occurred during the heating process. The incorporation of Nb5+ in the SrCoO3–δ -based oxides can significantly stabilize the neighboring oxygen octahedral, resulting in the improved stability of the (Ba0.15Sr0.85)(Nb0.15Co0.85)O3–δ . The oxygen sorption properties of (Ba0.15Sr0.85)(Nb0.15Co0.85)O3–δ between 300°C and 950°C in air were investigated, and a high sorption capacity of 9.45 mL O2 (STP)/g oxide was obtained.