Mixed conducting ceramic hollow‐fiber membranes for air separation

New Fabrication Techniques for Micro-Tubular Hollow Fiber Solid Oxide Fuel Cells

“…However, the gas permeance through the final, ca. 80 μm thick, electrolyte layer was measured to be 2.23×10 -5 mol m -2 s -1 Pa -1 , which is five orders of magnitude greater than the value of 10 -10 mol m -2 s -1 Pa -1 , at which the membrane is generally considered to be gas-tight (14). Hence, although an improvement on the previous result, the electrolyte layer in question was rendered unacceptable for use in fuel cells, due to the evident existence of microcracks.…”

“…Nitrogen was introduced into the sample holder at a range of pressures; the change in pressure within the sample holder, an indication of finite gas permeance through the electrolyte, was measured as a function of time by a pressure gauge and the gas permeance was computed according to the formula in (14). Current Collection and Sealing.…”

“…Gas permeability measurements were made to check the electrolyte for micro-cracks; a length of sealed-off fiber was encased in a 300 cm 3 volume capacity cylindrical stainless steel sample holder with the aid of epoxy resin and hardener (UKR-135 and UKH-136, respectively, UK Epoxy Resins, UK) (14). Nitrogen was introduced into the sample holder at a range of pressures; the change in pressure within the sample holder, an indication of finite gas permeance through the electrolyte, was measured as a function of time by a pressure gauge and the gas permeance was computed according to the formula in (14).…”

Dense ceramic oxygen permeable membranes and catalytic membrane reactors

“…Conditions: CO 2 concentration in the sweep gas varied from 0% to 100%;BSCF: T = 950°C, F air = 150 ml/min, F sweep = 100 ml/min; PLNCG: T = 975°C, F air = 180 ml/min, F sweep = 60 ml/min [91]. materials were investigated in the groups of Li [96][97][98][99][100][101], Liu [102][103][104], Schiestel and Caro [105][106][107], Trunec [108] and Diniz da Costa [109]. The hollow fiber membranes are prepared through a phase inversion method followed by a sintering process.…”

Funky inorganic fibers

“…Perovskite materials are very sensitive to sulfur impurities, limiting the amount of polymers that can be used. In addition, in order to fabricate defect free perovskite fibers, no percolative porous pathway can be present after sintering [74]. Perovskite fibers have been prepared out of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF).…”