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000850317 1001_ $$0P:(DE-Juel1)129660$$aSchulze-Küppers, F.$$b0$$eCorresponding author
000850317 245__ $$aComparison of freeze-dried and tape-cast support microstructure on high-flux oxygen transport membrane performance
000850317 260__ $$aNew York, NY [u.a.]$$bElsevier$$c2018
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000850317 520__ $$aThe overall permeation rate through asymmetric oxygen transport membranes is significantly governed by the porous support. Therefore, the microstructuring of the support's pore structure is essential to achieving the highest performances. Freeze casting is already proven to obtain hierarchical porous structures with low tortuosity, which potentially enhances the oxygen flux of oxygen transport membranes. Although a performance improvement has been reported, such improvement is not self-evident. There has yet to be a detailed comparison of the achieved microstructures in order to identify the relevant microstructural parameters. Asymmetric membranes from Ba0.5Sr0.5(Co0.8Fe0.2)0.97Zr0.03O3-δ consisting of a surface-activated 20 µm membrane layer with tape- or freeze-cast supports that have identical pore volume and layer thickness were manufactured, characterized, and compared by means of oxygen flux measurements. They were also microstructurally investigated via computed X-Ray tomography and flow simulation experiments. In the air/Ar gradient, the freeze-cast support membrane performs below the tape-cast-supported membrane. In particular, the transition zone close to the membrane, which is caused by the freezing process, significantly constrains the diffusivity and permeability of the support, and therefore leads to concentration polarizations. At temperatures below 800 °C, surface exchange kinetics at the membrane-support interface become rate-limiting.
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000850317 7001_ $$0P:(DE-Juel1)164278$$aUnije, U. V.$$b1$$ufzj
000850317 7001_ $$0P:(DE-HGF)0$$aBlank, H.$$b2
000850317 7001_ $$0P:(DE-Juel1)161336$$aBalaguer, M.$$b3
000850317 7001_ $$0P:(DE-Juel1)129587$$aBaumann, S.$$b4
000850317 7001_ $$0P:(DE-Juel1)129641$$aMücke, R.$$b5$$ufzj
000850317 7001_ $$0P:(DE-Juel1)129637$$aMeulenberg, W. A.$$b6$$ufzj
000850317 773__ $$0PERI:(DE-600)1491419-0$$a10.1016/j.memsci.2018.07.028$$gVol. 564, p. 218 - 226$$p218 - 226$$tJournal of membrane science$$v564$$x0376-7388$$y2018
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