Abstract
The effects of a thin RBaCo 2O 5 + δ (R= Pr, Nd, Sm, Gd) layer coating on the oxygen permeation flux through Ba 0.5Sr 0.5Co 0.8Fe 0.2O 5 + δ (BSCF) membrane were investigated. Due to the high oxygen adsorption and desorption rate constants k a and k d of the RBaCo 2O 5 + 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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