Oxygen exchange and transport properties of yttria-stabilized zirconia coated with LaCrO3 |
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Authors: | Hee Jung Park Gyeong Man Choi |
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Affiliation: | (1) Fuel Cell Research Center and Department of Materials Science and Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Pohang, 790-784, Korea |
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Abstract: | The oxygen permeation flux through YSZ (Yttria-Stabilized Zirconia) in reducing Po
2 is mostly controlled by the surface-exchange kinetics in spite of very high temperature 1]. In order to study the kinetics,
the YSZ surface was coated with LaCrO3 on feed side, permeate side, or two sides, and the oxygen fluxes were measured under controlled Po
2 gradient generated by different CO/CO2 mixtures (permeate side: ∼3 × 10−12 atm, feed side: 2 × 10−10∼2 × 10−8 atm) at 1600∘C. The oxygen flux was determined by measuring the change in CO2 content of the permeate-side gas. When both feed and permeate surfaces were coated, the oxygen flux increased by ∼6 times.
For either permeate- or feed-side coating, the increases were ∼4 times and ∼1.5 times, respectively. A model was proposed
in order to estimate the surface-exchange coefficient (
) of feed and permeate side with or without coating. |
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Keywords: | Solid oxide membrane Oxygen transport Surface modification YSZ LaCrO3 |
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