La 0.6 Sr 0.4 Fe 0.8 Co 0.2 O 3-δ electrophoretic coating for oxygen transport membranes

This work describes the development of electrophoretic deposition method for the elaboration of a porous coating on a dense membrane in order to improve its oxygen permeation performance. The dense membrane material produced from La 0.5 Sr 0.5 Fe 0.7 Ga 0.3 O 3-δ perovskite is coated with La 0.6 Sr 0.4 Fe 0.8 Co 0.2 O 3-δ perovskite layer by electrophoretic deposition method in order to improve the kinetics of oxygen surface exchanges. Then, the oxygen flux through the La 0.5 Sr 0.5 Fe 0.7 Ga 0.3 O 3-δ dense membrane is largely impacted by La 0.6 Sr 0.4 Fe 0.8 Co 0.2 O 3-δ electrophoretic coating, from 0.5 to 2.6 10 −3 mol⋅m −2 ⋅s −1 without and with La 0.6 Sr 0.4 Fe 0.8 Co 0.2 O 3-δ coating after heating at 900 °C, respectively. Besides, a large impact of the thickness of the electrophoretic coating on the oxygen flux through the membranes is observed. The electrophoretic deposition has shown to be a powerful elaboration method of membrane to produce gaseous oxygen with high purity. © 2019 The Author(s)