Abstract
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 La0.5Sr0.5Fe0.7Ga0.3O3-δ perovskite is coated with La0.6Sr0.4Fe0.8Co0.2O3-δ perovskite layer by electrophoretic deposition method in order to improve the kinetics of oxygen surface exchanges. Then, the oxygen flux through the La0.5Sr0.5Fe0.7Ga0.3O3-δ dense membrane is largely impacted by La0.6Sr0.4Fe0.8Co0.2O3-δ electrophoretic coating, from 0.5 to 2.6 10−3 mol⋅m−2⋅s−1 without and with La0.6Sr0.4Fe0.8Co0.2O3-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.
Highlights
The oxygen transport membrane (OTM) are dense ceramic membranes produced from mixed ionic and electronic conducting materials
The oxygen flux through the membrane is usually limited by the oxygen surface exchanges [Geffroy 2015, Geffroy 2017], and a coating of submicronic particles on the dense membrane can lead to improve the kinetics of the oxygen surface exchanges and improve oxygen flux [Hayamizu 2014, Xu 1999]
This work is focused on the impact of the thickness of a surface porous layer deposited by electrophoretic deposition on a membrane, using submicronic particles, on the oxygen flux performance
Summary
The oxygen transport membrane (OTM) are dense ceramic membranes produced from mixed ionic and electronic conducting materials. La0.5Sr0.5Fe0.7Ga0.3O3-δ (LSFG5573) perovskite is used as dense membrane material because of its high oxygen diffusion coefficient, good chemical stability and mechanical properties [Sunaro 2008, Geffroy 2013]. La0.6Sr0.4Fe0.8Co0.2O3-δ (LSFCo6482) perovskite, with very high kinetics for oxygen surface exchanges [Guironnet 2016] but low mechanical properties, is used as coating materials onto the membrane, in order to improve the kinetics of oxygen surface exchanges. The coating on the dense membrane is manufactured by electrophoretic deposition (EPD) This coating method has a great interest because it can be used for many different materials. Each 15 minutes during the attrition milling, a granulometry analysis is done using a laser granulometer (Horiba LA950), in order to obtain the desired monomodal grain size distribution with a mean diameter close to 1 μm. The formation of a perovskite phase is confirmed by X-ray diffraction (Siemens D5000, CuKα1) and chemical composition is verified by inductively coupled plasma atomic emission spectrometer
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