Universally applicable kinetic model for mixed ionic-electronic conducting membranes

Kinetic model is significant for disclosing the oxygen permeation process through mixed ionic-electronic conducting (MIEC) membranes. However, current kinetic models are only applicable for certain materials. As a result, it is difficult to select a proper model to compare kinetic parameters of different membranes. In this paper, based on the dependence of oxygen vacancy concentration on oxygen partial pressure in the bulk of MIEC membrane, an extending of Zhu's model was established for extensive MIEC membranes by revising one assumption in the original model. La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) membranes with different thickness and coated/uncoated LSCF catalyst layers and La(0.7)Sr(0.3)Coo(3)(-delta) (LSC) membrane were chosen to verify the correctness of the extended model. The fitting results of LSCF and LSC are reasonable and exclusive compared to the original model and Xu-Thomson's model. In a word, the extended model can be applied to various MIEC materials. (C) 2019 Elsevier Ltd. All rights reserved.