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Selection of oxygen permeation models for different mixed ionic‐electronic conducting membranes
Author(s) -
Zhu Yue,
Li Wenping,
Liu Yan,
Zhu Xuefeng,
Yang Weishen
Publication year - 2017
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.15718
Subject(s) - permeation , membrane , partial pressure , oxygen , perovskite (structure) , chemistry , ionic bonding , vacancy defect , analytical chemistry (journal) , thermodynamics , materials science , chemical engineering , chromatography , crystallography , ion , physics , organic chemistry , biochemistry , engineering
Permeation data of several mixed ionic‐electronic conducting (MIEC) membranes were analyzed by two oxygen permeation models (i.e., Zhu's model and Xu–Thomson's model), respectively, to find a concise method to guide the choice of permeation models. We found that Zhu's model can well fit the permeation data of perovskite‐type membranes, like Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3‐δ (BSCF) and BaCe 0.05 Fe 0.95 O 3‐δ (BCF), and dual‐phase membranes, like 75 wt % Ce 0.85 Sm 0.15 O 1.925 –25 wt % Sm 0.6 Sr 0.4 Al 0.3 Fe 0.7 O 3‐δ (SDC‐SSAF), whose oxygen vacancy concentrations are almost independent of the oxygen partial pressure at elevated temperatures. However, Zhu's model was not appropriate for membranes whose oxygen vacancy concentration changed obviously with oxygen partial pressure at elevated temperatures, such as La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3‐δ (LSCF) and La 0.7 Sr 0.3 CoO 3‐δ (LSC). On the contrary, Xu–Thomson's model can fit the data of LSCF and LSC well, but it is inapplicable for BSCF, BCF, and SDC‐SSAF. Therefore, the dependence of oxygen vacancy concentration on oxygen partial pressure was suggested as an index for the selection of the permeation models. © 2017 American Institute of Chemical Engineers AIChE J , 63: 4043–4053, 2017