Improvement of oxygen adsorption capacity of YbBaCo4O7+δ by Gd-for-Yb substitution

Yb1−xGdxBaCo4O7 samples were prepared by the solid-state reaction method and the effect of Gd substitution on the oxygen adsorption/desorption properties was investigated by thermogravimetric analysis. XRD results indicated that these samples are single phase when x ≤ 0.6. In oxygen, Yb1−xGdxBaCo4O7 samples experience two oxygen adsorption/desorption processes from room temperature to 1000 °C and oxygen adsorption capacity is improved by Gd substitution. For Yb0.4Gd0.6BaCo4O7 sample, when the temperature is switched between 320 °C and 450 °C, the mass change can reach 3.4% due to oxygen intake at 320 °C and oxygen release at 450 °C. When the atmosphere is switched between O2 and N2 at 340 °C, the mass change is 2.8% due to oxygen intake in O2 and oxygen release in N2. The large adsorption capacity and good reproducibility of Yb0.4Gd0.6BaCo4O7 make it a highly potential candidate for oxygen storage materials.