Mixed conductivity and electrocatalytic performance of SrFeO3-δ–SrAl2O4 composite membranes |
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| Institution: | 1. CEITEC IPM, Central European Institute of Technology, Institute of Physics of Materials, ASCR, v.v.i., ?i?kova 22, Brno 61662, Czech Republic;2. Faculty of Science, Physics Department, Mansoura University, Mansoura 35516, Egypt;3. Faculty of Mathematics and Physics, Institute of Physics, Charles University, Ke Karlovu 5, Prague 121 16, Czech Republic;4. CEITEC BUT, Central European Institute of Technology, Brno University of Technology, Technicka 10, Brno 61600, Czech Republic |
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| Abstract: | Oxygen-ionic and electronic transport in dense (SrFe)1?x(SrAl2)xOz composites, consisting of strontium-deficient Sr(Fe,Al)O3-δ and SrAl2O4 phases, is determined by the properties of perovskite-like solid solution. Increasing the content of SrAl2O4, with a total conductivity as low as 5 × 10? 7 ? 10? 5 S × cm? 1 at 973–1273 K in air, results in the gradual decrease of the partial conductivities, but also enables the suppression of thermal expansion. Compared to single-phase SrFe1?xAlxO3-δ, (SrFe)1?x(SrAl2)xOz composites exhibit enhanced thermomechanical properties, while the oxygen permeability of these materials has similar values. The composite membranes exhibit stable performance under air/(H2–H2O–N2) and air/(CH4–He) gradients at 973–1173 K. The oxidation of dry methane by oxygen permeating through (SrFe)0.7(SrAl2)0.3Oz results in dominant total oxidation, suggesting the necessity to incorporate a reforming catalyst into the ceramic reactors for natural gas conversion. |
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