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Influence of oxygen partial pressure on the oxygen diffusion and surface exchange coefficients in mixed conductors
Journal of the European Ceramic Society ( IF 5.7 ) Pub Date : 2018-03-26 , DOI: 10.1016/j.jeurceramsoc.2018.03.034
P.-M. Geffroy , L. Guironnet , H.J.M. Bouwmeester , T. Chartier , J.-C. Grenier , J.-M. Bassat

The performances of mixed ionic and electronic conductors is used in many applications, such as oxygen transport membranes or electrodes in solid oxide fuel cells. The performances of these systems depend mainly on two fundamental parameters including oxygen diffusion (DO) and the oxygen exchange coefficient (k). This work focuses on the impact of the oxygen partial pressure on oxygen diffusion and surface exchange coefficients of mixed conducting materials, as reported studies are scarce in the literature. In this way, two different mixed conducting materials are studied, namely, La0.6Sr0.4Fe0.6Ga0.4O3-δ, a perovskite-type material, and the nickelate La2NiO4+δ. The DO and k coefficients are determined by a specific oxygen permeation measurement and by the isotopic exchange depth profile method.



中文翻译:

氧分压对混合导体中氧扩散和表面交换系数的影响

离子和电子混合导体的性能用于许多应用中,例如氧气传输膜或固体氧化物燃料电池中的电极。这些系统的性能主要取决于两个基本参数,包括氧扩散(D O)和氧交换系数(k)。这项工作集中在氧气分压对混合导电材料的氧气扩散和表面交换系数的影响上,因为文献中报道的研究很少。这样,研究了两种不同的混合导电材料,即钙钛矿型材料La 0.6 Sr 0.4 Fe 0.6 Ga 0.4 O3 和镍酸盐La 2NiO 4 +δ。D O和k系数由特定的氧气渗透率测量和同位素交换深度剖面法确定。

更新日期:2018-03-26
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