Transport properties of SrCo0.9Nb0.1O3-δ and SrCo0.9Ta0.1O3-δ mixed conductors determined by combined oxygen permeation measurement and phenomenological modeling

被引：15

作者：

Yang, Tianrang ^{[1
]}

Jin, Xinfang ^{[1
]}

Huang, Kevin ^{[1
]}

机构：

[1] Univ South Carolina, Dept Mech Engn, Columbia, SC 29208 USA

来源：

JOURNAL OF MEMBRANE SCIENCE | 2018年 / 568卷

基金：

美国国家科学基金会;

关键词：

Oxygen permeation; Bulk diffusion; Surface exchange; Ionic conductivity; Mixed conductors; DUAL-PHASE MEMBRANE; DOPED SRCOO3-DELTA; SURFACE EXCHANGE; DEFECT CHEMISTRY; OXIDE-ION; CATHODE; PEROVSKITES; PERFORMANCE; DIFFUSION; KINETICS;

D O I：

10.1016/j.memsci.2018.09.053

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Mixed oxide-ion and electron conductors (MIECs) are a scientifically and technologically important class of functional materials for energy conversion and storage. The present work reports a study on transport properties of two well-known MIECs, SrCo0.9Nb0.1O3-delta (SCN) and SrCo0.9Ta0.1O3-delta(SCT), using a combined experimental oxygen permeation measurement and theoretical modeling approach. The results suggest that SCN has a higher oxygen diffusivity, surface oxygen exchange rate constant and oxide-ion conductivity than SCT even though both materials have the same crystal structure. A molecular orbital energy analysis reveals that the slight difference in outer electronic shell configuration between Nb5+ and Ta5+ is responsible for the variance in transport properties.

引用

页码：47 / 54

页数：8

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