We studied the cobalt-free BaCe0.1Fe0.9O3-δ membranes with different grain sizes by our theoretical model to disclose the influence of grain size on oxygen transport kinetics. Model studies reveal that interfacial oxygen exchange resistances on both sides increase with the increase of grain size, while the bulk diffusion resistance changes slightly. It indicates that grain boundaries are active sites for oxygen exchange reactions and have little effect on the bulk diffusion. This work has been published in Journal of Membrane Science, 2020, 603, 118038.
