Effects of scandium doping concentration on the properties of strontium cobalt oxide membranes

Pingying Zeng, Ran Ran, Zongping Shao, Hai Yu, Shaomin Liu

科研成果: 期刊稿件文章同行评审

10 引用 (Scopus)

摘要

Perovskite-type mixed conducting oxides of SrCo1-ySc yO (y=0.02-0.7) were synthesized by a combined EDTA-citrate complexing method. Different scandium doping concentrations in SrCo1-yScyO3-δ have significant effects on the phase structure, electrical conductivity, surface properties and oxygen permeation behaviour of the resultant membranes. SrCoO3-δ without scandium incorporation displayed a 2H BaNiO3-type structure with almost zero oxygen flux at high temperatures. Small amounts of Sc 2O3 doping (y<0.1) efficiently stabilized the oxide in a cubic perovskite structure, leading to a sharp increase in the permeation flux, with a maximum value of 3.1ml.cm-2.min-1 achieved at 900°C for SrCo0.95Sc0.05O3-δ and SrCo0.9Sc0.1O3-δ membranes. The permeation process could be rate-limited by either the oxygen bulk diffusion, oxygen surface exchange, or a combination of both depending on the scandium doping level. Further increases of the Sc3+ doping concentration (y>0.1) were found to lower the membrane oxygen fluxes, with y≥0.4 doped SrCo1-yScyO3-δ ceramics no longer showing any oxygen permeation.

源语言英语
页(从-至)563-574
页数12
期刊Brazilian Journal of Chemical Engineering
26
3
DOI
出版状态已出版 - 2009

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