Oxygen behavior in Y1-xZrxBaCo4O7+δ

Abstract

Y1-xZrxBaCo4O7+δ (x = 0.0, 0.05, 0.1, 0.2, 0.4, 0.6) samples were synthesized by the solid state reaction method. The effects of Zr substitution for Y on the oxygen uptake/release properties of these samples were investigated by thermogravimetric (TG) from room temperature to 1150°C. The results show that there exists an optimizing Zr doping amount. The Y0.9Zr0.1BaCo4O7+δ sample can uptake more oxygen than the undoped YBaCo4O7+δ sample at 360°C. Especially, in an oxygen uptake/release cycles between 340°C and 410°C, the mass change of the doped Y0.9Zr0.1BaCo4O7+δ sample can reach 5.3 % of its original mass and show a stable oxygen uptake/release reproducibility. In addition, in the oxygen uptake/release cycles switched between oxygen and nitrogen atmosphere at 350°C, Y0.9Zr0.1BaCo4O7+δ can also adsorb more oxygen. These properties of Y1-xZrxBaCo4O7+δ make them to be a potential candidate in the field of gas purification and separation.

Keywords

• Y1-xZrxBaCo4O7+δ
• Thermogravimetric
• Oxygen-storage
• Gas separation