Abstract
Although the principle of oxygen permeation through an MIEC membrane is simple, it is difficult to develop a proper mathematical equation to describe the processes including oxygen exchange reactions on gas–solid interfaces and ambipolar diffusion in membrane bulk. In this chapter, the classical Wagner equation is introduced firstly. Only the oxygen permeation through an MIEC membrane is dominated by the ambipolar diffusion in membrane bulk; the permeation process can be well described by the Wagner equation. However, most of membranes are limited by the joint control of interfacial exchange and bulk diffusion. Therefore, three permeation models were developed by researchers to include the influence of oxygen exchange reactions on the gas–solid interfaces. The derivation and applications of the three models are separately introduced in detail in this chapter.
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Zhu, X., Yang, W. (2017). Permeation Principle and Models. In: Mixed Conducting Ceramic Membranes. Green Chemistry and Sustainable Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-53534-9_5
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DOI: https://doi.org/10.1007/978-3-662-53534-9_5
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