Mixed-conducting LSC/CGO composites for passive oxygen separation membranes

作者：Seeharaj Panpailin^*; Berenov Andrey; Raj Edwin; Rudkin Robert; Atkinson Alan

来源：Solid State Ionics, 2011, 192(1): 638-641.

DOI：10.1016/j.ssi.2010.05.042

• Oxygen separation
• Mixed conductor
• Composite

Dense mixed-conducting composite materials of BC (La(0.9)Sr(0.1)CoO(3-delta) or La(0.6)Sr(0.4)CoO(3-delta)) and CGO (Ce(0.9)Gd(0.1)O(2-delta)) prepared by conventional powder mixing and sintering have been studied for possible application as oxygen separation membranes. The composites showed high relative density (above 95%), low background gas leakage and also good electrical conduction. The percolation threshold of the electronic-conducting component was determined to be approximately 20 vol.% for both LSC compositions. Isotopic exchange and depth profiling by secondary ion mass spectrometry was used to investigated the oxygen tracer diffusion (D*) and surface exchange coefficient (k*) of the composites. Composites exceeding the electronic percolation threshold, showed high oxygen diffusivities and surface exchange properties and intermediate thermal expansion thus combining the benefits of their constituent materials.

• 出版日期2011-6-16