Details

Autor(en) / Beteiligte

• Pei, Yujie
• Liu, Qingcui
• Chen, Yiying
• Tian, Yaping
• Li, Yunqing
• Pang, Ruiqi
• Li, Fang
• Li, Qiming

Titel

Effects of A-site potassium doping on oxygen permeability and intermediate-low temperature stability of Ba0.5Sr0.5Co0.8Fe0.2O3−δ membranes

Ist Teil von

• Journal of the European Ceramic Society, 2024-03, Vol.44 (3), p.1654-1664

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) perovskite membranes process excellent oxygen permeation flux at high temperature. However, the time-dependent flux degradation of BSCF restricts its industrial application at intermediate-low temperature. To address this issue, a series of K+ doped BSCF perovskite materials were prepared by EDTA-citric acid combined complexing method. The effect of K+ introduction on crystal structure, oxygen vacancy concentration, oxygen permeability and flux degradation of BSCF was systematically investigated. The results indicates that BSCF doped with K+ exhibits typical cubic perovskite structure and optimized oxygen permeability while the doping content of K+ is lower than 20%. Meanwhile, the oxygen permeability of BSCF can be significantly improved by introducing K+ ions, where the highest oxygen permeation flux of K0.05Ba0.45Sr0.5Co0.8Fe0.2O3-δ could reach up to 2.70 ml.min-1.cm-2. And a stable intermediate-low temperature oxygen permeation flux of 0.81 ml.min-1.cm-2 at 750 oC for 90 h can be realized for K0.1Ba0.4Sr0.5Co0.8Fe0.2O3-δ and no obvious flux degradation can be found.