A novel way to fabricate tubular porous mullite membrane supports by TBA-based freezing casting method

Liu, Ruiping; Yuan, Jie; Wang, Chang‐An

doi:10.1016/j.jeurceramsoc.2013.06.005

Cited by 70 publications

(28 citation statements)

References 25 publications

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“…The decrease in the width of pore channels at lower freeze casting temperatures is attributed to a faster freezing rate that results in finer ice crystals and this observation is in agreement with the literature . Mixed results have been reported for the role of freezing temperature on the porosity of freeze‐cast samples . It is likely that the actual effect of freezing temperature on the porosity is also dependent on other factors such as solids loading of the slurry and particle size of the ceramic powders.…”

Section: Resultssupporting

confidence: 88%

“…20,42 Mixed results have been reported for the role of freezing temperature on the porosity of freeze-cast samples. 22,26,43 It is likely that the actual effect of freezing temperature on the porosity is also dependent on other factors such as solids loading of the slurry and particle size of the ceramic powders. In this work, a freezing temperature of -15°C was selected for the fabrication of tubular single cells and electrochemical performance analysis as a balance between the porosity and mechanical integrity of the green samples for the given slurry formulation.…”

Section: Resultsmentioning

confidence: 99%

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Tubular solid oxide fuel cells fabricated by a novel freeze casting method

et al. 2019

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Freeze casting is an established method for fabricating porous ceramic structures with controlled porosity and pore geometries. Herein, we developed a novel freeze casting and freeze drying process to fabricate tubular anode supports for solid oxide fuel cells (SOFCs). Freeze casting was performed by injecting aqueous anode slurry to a dual‐purpose freeze casting and freeze drying mold wrapped with peripheral coils for flowing a coolant. With the use of an ice barrier layer, proper control of the experimental setup, and adjustments in the drying temperature profile, complete drying of the individual anode tubes was achieved in 4 hours. The freeze‐cast anode tubes contained radially aligned columnar pore channels, thus significantly enhancing the gaseous diffusion. SOFC single cells with conventional Ni/yttria‐stabilized zirconia/strontium‐doped lanthanum manganite materials were prepared by dip coating the thin functional layers onto the anode support. Single cell tests showed that the concentration polarization was low owing to the highly porous anode support with directional pores. With H2/N2 (1:1) fuel, maximum power densities of 0.47, 0.36, and 0.27 W/cm2 were recorded at 800°C, 750°C, and 700°C, respectively. Our results demonstrate the feasibility of using freeze casting to obtain tubular SOFCs with desired microstructures and fast turn‐around times.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Tubular solid oxide fuel cells fabricated by a novel freeze casting method

et al. 2019

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“…Up to now, few studies of tubular asymmetric MIEC membranes are reported mainly due to the difficulty in manufacture, but generally oxygen permeation values obtained are much higher than planar configuration tests [14][15][16][17]. The first attempts for implementing ice-templating to elaborate tubular asymmetric membranes were conducted by Moon et al [18,19] and most recently by Liu et al [20] and Seuba et al [21]. Despite the impressive results obtained from these studies and the demonstration of ice-templating as a useful technique for the production of ceramic tubes with hierarchically oriented porosity, there are no studies in literature where freeze-cast tubes are applied for oxygen production in asymmetric membranes.…”

Section: Introductionmentioning

confidence: 99%

Ice-Templating for the Elaboration of Oxygen Permeation Asymmetric Tubular Membrane with Radial Oriented Porosity

Gaudillere¹,

García‐Fayos²,

Plaza³

et al. 2019

Ceramics

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An original asymmetric tubular membrane for oxygen production applications was manufactured in a two-step process. A 3 mol% Y2O3 stabilized ZrO2 (3YSZ) porous tubular support was manufactured by the freeze-casting technique, offering a hierarchical and radial-oriented porosity of about 15 µm in width, separated by fully densified walls of about 2 µm thick, suggesting low pressure drop and boosted gas transport. The external surface of the support was successively dip-coated to get a Ce0.8Gd0.2O2−δ – 5mol%Co (CGO-Co) interlayer of 80 µm in thickness and an outer dense layer of La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) with a thickness of 30 µm. The whole tubular membrane presents both uniform geometric characteristics and microstructure all along its length. Chemical reactivity between each layer was studied by coupling X-Ray Diffraction (XRD) analysis and Energy Dispersive X-Ray spectroscopy (EDX) mapping at each step of the manufacturing process. Cation interdiffusion between different phases was discarded, confirming the compatibility of this tri-layer asymmetric ceramic membrane for oxygen production purposes. For the first time, a freeze-cast tubular membrane has been evaluated for oxygen permeation, exhibiting a value of 0.31 ml·min−1·cm−2 at 1000ºC under air and argon as feed and sweep gases, respectively. Finally, under the same conditions and increasing the oxygen partial pressure to get pure oxygen as feed, the oxygen permeation reached 1.07 ml·min−1·cm−2.

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“…Typically, the pore structure exhibit high open porosity with low tortuosity, indicating great potential for fluid permeation applications. In fact, several papers have assessed the fluid permeation on freeze-cast substrates with impressive results 1,17,18 . When considering production of freeze-cast substrates for membrane production, the tubular geometry is more appropriate than flat supports.…”

Section: Separation Methodsmentioning

confidence: 99%

Production and Characterization of a Silica-Alumina Membrane Using Novel Tubular Freeze-Cast Substrates

et al. 2019

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Development of new ceramic membranes has recently grown due to its superior thermal and mechanical stability. An interesting approach to manufacture asymmetric membranes is the production of aligned pore structure by the freeze-casting method. The lack of studies involving membrane production with tubular freeze-cast substrates warrants more research. In this study, a novel tubular freeze-cast alumina substrate was used for deposition of a silica top layer. The substrate showed radially aligned pores, indicating precise structure control. The obtained pore structure shows high potential for membrane manufacture. The silica layer was produced by the sol-gel method and dip-coated on the substrates with two different withdrawal speeds. The microporous silica showed pores smaller than 2 nm. The highest withdrawal speed resulted in broader substrate coverage. However, a uniform silica layer was only obtained after a second deposition. These results confirm the viability to use tubular freeze-cast substrates for production of nanofiltration membranes.

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A novel way to fabricate tubular porous mullite membrane supports by TBA-based freezing casting method

Cited by 70 publications

References 25 publications

Tubular solid oxide fuel cells fabricated by a novel freeze casting method

Tubular solid oxide fuel cells fabricated by a novel freeze casting method

Ice-Templating for the Elaboration of Oxygen Permeation Asymmetric Tubular Membrane with Radial Oriented Porosity

Production and Characterization of a Silica-Alumina Membrane Using Novel Tubular Freeze-Cast Substrates

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