Cobalt-free gadolinium-doped perovskite Gd_xBa_1−xFeO_3−δ as high-performance materials for oxygen separation

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• 作者：Yanjie Wang ; Qing Liao ; Yan Chen ; Libin Zhuang ; Haihui Wang ; ^{hhwang@scut.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Perovskite ; Membranes ; Permeation ; BaFeO3&minus ; δ ; Oxygen separation
• 刊名：Chinese Journal of Chemical Engineering
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：23
• 期：11
• 页码：1763-1767
• 全文大小：862 K

文摘

Cobalt-free oxides Gd_xBa_1−xFeO_3−δ (0.01 ≤ x ≤ 0.1) were achieved by a solid state reaction method. It is found that Gd_xBa_1−xFeO_3−δ (0.025 ≤ x ≤ 0.1) exhibits the cubic perovskite structure. Among Gd_xBa_1−xFeO_3−δ (0.025 ≤ x ≤ 0.1), the Gd_0.025Ba_0.975FeO_3−δ (GBF2.5) membrane shows the outstanding phase structure stability and the highest oxygen permeation, which can reach 1.44 ml·cm^− 2·min^− 1 at 950 °C under air/He oxygen partial pressure gradient. The GBF2.5 membrane was successfully operated for more than 100 h at 800 °C and the oxygen permeation flux through the membrane is 0.62 ml·cm^− 2·min^− 1. After 100 h oxygen permeation experiment at 800 °C, X-ray diffraction (XRD) and energy dispersive X-ray spectrometer (EDXS) demonstrate that the GBF2.5 exhibits phase structure stability even at intermediate temperature.