Enhancing the oxygen permeability of Ba0.5Sr0.5Co0.8Fe0.2O5 + δ membranes by coating RBaCo2O5 + δ(R= Pr, Nd, Sm, Gd) layers |
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| Authors: | Zigang Shen Gang Yan |
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| Affiliation: | a School of Physical Engineering, Zhengzhou University, Zhengzhou 450052, PR China
b College of Materials Science and Engineering, Henan University of Technology, Zhengzhou 450007, PR China |
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| Abstract: | The effects of a thin RBaCo2O5 + δ (R= Pr, Nd, Sm, Gd) layer coating on the oxygen permeation flux through Ba0.5Sr0.5Co0.8Fe0.2O5 + δ(BSCF) membrane were investigated. Due to the high oxygen adsorption and desorption rate constants ka and kd of the RBaCo2O5 + δ (R112) materials and the porous structure of the coating layers, the oxygen permeation flux through the BSCF membranes can be enhanced remarkably. It was found that the reaction between Pr112 and BSCF also has significant influence on the oxygen permeation flux. The reaction between Pr112 and BSCF forms impurities which may block oxygen permeation flux. However, Nd112, Sm112, and Gd112 do not react seriously with BSCF, therefore, coating layers of these materials can significantly enhance the oxygen permeation flux of BSCF membranes. |
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| Keywords: | Oxygen permeation membranes Coating layer RBaCo2O5 + δ |
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