Please use this identifier to cite or link to this item:
|Title:||Crafting La0.2Sr0.8MnO3-δ membrane with dense surface from porous YSZ tube|
|Authors:||Yin, X. |
|Keywords:||Asymmetric ceramic membrane|
|Citation:||Yin, X., Choong, C., Hong, L., Liu, Z. (2006-08). Crafting La0.2Sr0.8MnO3-δ membrane with dense surface from porous YSZ tube. Journal of Solid State Electrochemistry 10 (8) : 643-650. ScholarBank@NUS Repository. https://doi.org/10.1007/s10008-006-0131-1|
|Abstract:||This work reports a new design of asymmetric tubular oxygen-permeable ceramic membrane (OPCM) consisting of a porous Y2O3 stabilized ZrO2 (YSZ) tube (with ∼1 μm of pore diameters and 31% porosity) as the support and a gas-tight mixed conductive membrane. The membrane has an interlocking structure composed of a host matrix, Ag(Pd) alloy (9:1 by wt) doped perovskite-type La0.2Sr0.8MnO 3-δ(LSM80, 90wt%), and the embedded constituent, pristine LSM80. The Ag(Pd) alloy component promotes not only electronic conductivity and mechanical strength but also reduction of both porosity and pore sizes in the layer (∼10-μm-thick) where it dopes. The porous structure in this layer could then be closed through a solution coating procedure by which ingress of an aqueous solution containing stoichiometric nitrate salts of La3+, Mn3+, and Sr2+ to the pore channels takes place first and the mixture of nitrate salts left after drying is subjected to pyrolysis to generate tri-metal oxides in situ. This is followed by calcinations at l,300 °C to consolidate the embedded trioxide and to cohere them with the Ag(Pd)-LSM80 host matrix. The structure formed is dubbed LSM80(S)-Ag(Pd)-LSM80, which was confirmed gas-tight by electron micrograph and N2 permeation test. Finally, we assess the chemical compatibility between LSM80 and YSZ at the sintering temperature by X-ray diffraction and electrochemical impedance analysis. The oxygen permeation of the fabricated LSM80(S)-Ag(Pd)- LSM80-YSZ membrane is within the temperature range of 600 to 900 °C. The tests reveal good compatibility between the LSM80 and YSZ and a reasonably high oxygen permeation flux in association with this OPCM assembly.|
|Source Title:||Journal of Solid State Electrochemistry|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Nov 9, 2018
WEB OF SCIENCETM
checked on Oct 31, 2018
checked on Oct 26, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.