The Impact of Experimental Factors on Oxygen Semi-Permeation Measurements

Abstract

International audienceMany recent studies have focused on the development of perovskite membranes with high oxygen semi-permeation performance. However, the usual experimental setups used to measure oxygen semi-permeation values may lead to significant errors in the actual performance of the membrane materials. In this paper, special attention is paid to the experimental conditions and the associated impacts on oxygen semi-permeation measurements collected from the membrane. Furthermore, the experimental setups described in the literature do not allow the direct identification of the limiting step for oxygen transport through the membrane, i.e., either through bulk oxygen diffusion or oxygen surface exchange on both membrane surfaces. In this work, a specific experimental setup is proposed for the discrimination of oxygen bulk diffusion and surface exchange phenomen

Impact of microstructure on oxygen semi-permeation performance of perovskite membranes: Understanding of oxygen transport mechanisms

“…The oxygen semi-permeation and oxygen activities at the membrane surface are measured using a custom built apparatus described in previous studies [24,25] and shown in Fig. 1.…”

“…On the surface membrane, the oxygen surface activities are measured using pure ionic conductor tips (ZrO 2 -8%Y 2 O 3 ) and a metallic electrode in contact with the surface membrane. Then, the oxygen chemical potential through the membrane is evaluated as previously described by Geffroy et al [25].…”

Identification of the rate-determining step in oxygen transport through La(1−x)SrxFe(1−y)GayO3−δ perovskite membranes

“…3), described in previous studies [10,11]. The oxygenpermeation measurement was performed on two membrane samples for each membrane material to ensure reproducibility.…”

Experimental set up for the mechanical characterization of plane ITM membrane at high temperature

“…Their oxygen permeation properties have already been characterized by Reichmann [32,33]. Furthermore, the chemical expansion of La 0.8 Sr 0.2 Fe 0.7 Ga 0.3 O 3−␦ have been extensively studied by Valentin [34] and its Young modulus have been partly characterized by a high temperature ultrasonic pulse echo technique (350 kHz) [35] and by C-ring on tubular part at R.T. [36].…”

“…The manufacturing process is extensively detailed in [32][33]. The final relative density of the disks is higher than 95%, the diameter is 25 ± 1 mm and the thickness is 1 ± 0.1 mm.…”