کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1295470 | 1498402 | 2006 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Surface effect on oxygen permeation through dense membrane of mixed-conductive LSCF perovskite-type oxide Surface effect on oxygen permeation through dense membrane of mixed-conductive LSCF perovskite-type oxide](/preview/png/1295470.png)
La0.1Sr0.9Co0.9Fe0.1O3−δ (LSCF1991) dense disks with different thicknesses and surface areas were prepared to investigate the contribution of surface reactions and bulk diffusion in oxygen permeation phenomena. The bulk diffusion controlled situation became significant with increasing the membrane thickness, and the surface reaction controlled situation prevailed at smaller surface area. The increase in surface area at the low P(O2) (anode) side was more effective to increase the oxygen permeation flux than that at the high P(O2) (cathode) side. The coating of a porous catalyst layer below the optimum thickness was also effective in enhancing the oxygen permeability due to the increase in surface area, but the coating with too thick layer deteriorated the permeability probably due to the increase in the gas diffusion resistance.
Journal: Solid State Ionics - Volume 177, Issues 26–32, 31 October 2006, Pages 2249–2253