Oxygen transport properties of dense and porous (La0.8Sr0.2)0.99Co0.8Ni0.2O3-δ

被引：16
|
作者：
Hjalmarsson, Per [1 ]
Sogaard, Martin [1 ]
Mogensen, Mogens [1 ]
机构：
[1] Tech Univ Denmark, Fuel Cells & Solid State Chem Dept, Riso Natl Lab Sustainable Energy, DK-4000 Roskilde, Denmark
来源：
SOLID STATE IONICS | 2009年 / 180卷 / 23-25期
关键词：
Surface exchange coefficient; Diffusion coefficient; Oxygen transport; Perovskite; Lanthanum strontium cobalt nickel oxide; ELECTROCHEMICAL PERFORMANCE; DIFFUSION-COEFFICIENT; CHEMICAL DIFFUSION; KINETICS; LA1-XSRXCOO3-DELTA; MECHANISMS; EXCHANGE; NONSTOICHIOMETRY; PEROVSKITES; DEGRADATION;
D O I：
10.1016/j.ssi.2009.07.012
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We have determined k(ex) and D-chem for (La0.8Sr0.2)(0.99)Co0.8Ni0.2O3-delta by the use of electrical conductivity relaxation on a dense sample and by applying the ALS model to measured AC impedance spectrum on a porous electrode. Extracting k(ex) and D-chem from the methods resulted in comparable values. k(ex) and D-chem also agreed well with literature values on La0.8Sr0.2CoO3-delta, indicating that nickel substitution does not change the oxygen transport properties. k(ex) of the porous sample was further found to decrease with a five times higher rate than D-chem when measured by using an Electrochemical Impedance Spectroscopy (EIS) over several days. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：1290 / 1297
页数：8
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