The effect of the magnitude of the oxygen partial pressure change in electrical conductivity relaxation measurements:: oxygen transport kinetics in La0.5Sr0.5CoO3-δ

被引：95

作者：

Wang, S ^{[1
]}

Verma, A ^{[1
]}

Yang, YL ^{[1
]}

Jacobson, AJ ^{[1
]}

Abeles, B ^{[1
]}

机构：

[1] Univ Houston, Mat Res Sci & Engn Ctr, Dept Chem, Houston, TX 77204 USA

来源：

SOLID STATE IONICS | 2001年 / 140卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

electrical conductivity relaxation; diffusion coefficients; surface exchange reactions; La0.5Sr0.5CoO3-delta;

D O I：

10.1016/S0167-2738(01)00709-3

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：

The kinetics of oxygen transport in La0.5Sr0.5CoO3-delta were investigated using the electrical conductivity relaxation technique in the temperature range from 600 degreesC to 700 degreesC and with oxygen partial pressures from 0.01 to 1.0 atm. The effects of oxygen partial pressure on the chemical diffusivity of oxygen, D-chem, and surface exchange coefficient, k(chem), were investigated by systematically changing the initial (p(1)) and the final (p(2)) oxygen partial pressures. Results showed that for oxygen partial pressure switches with p(1)/p(2) > 20, a linear model for the exchange kinetics is no longer valid. The dependence of the exchange kinetics on the final oxygen partial pressure was determined. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：125 / 133

页数：9

共 28 条

[1] Mechanism and kinetics of oxygen reduction on porous La1-xSrxCoO3-δ electrodes [J].

Adler, SB .

SOLID STATE IONICS, 1998, 111 (1-2) :125-134

[2] Oxygen permeation of La0.3Sr0.7CoO3-delta [J].

Chen, CH ;

Bouwmeester, HJM ;

vanDoorn, RHE ;

Kruidhof, H ;

Burggraaf, AJ .

SOLID STATE IONICS, 1997, 98 (1-2) :7-13

[3]

CHEN X, UNPUB

[4] Oxygen transport in La1-xSrxMn1-yCoyO3±δ perovskites -: Part I.: Oxygen tracer diffusion [J].

De Souza, RA ;

Kilner, JA .

SOLID STATE IONICS, 1998, 106 (3-4) :175-187

[5] The types of surface exchange and diffusion of oxygen in La0.7Sr0.3CoO3-δ [J].

Ezin, AN ;

Kurumchin, EK ;

Murygin, IV ;

Tsidilkovski, VI ;

Vdovin, GK .

SOLID STATE IONICS, 1998, 112 (1-2) :117-122

[6]

FRANKE P, 1987, ADV CERAM, V23, P27

[7]

GELLINGS PJ, 1997, SOLID STATE ELECTROC

[8] Surface exchange of oxygen in mixed conducting perovskite oxides [J].

Kilner, JA ;

DeSouza, RA ;

Fullarton, IC .

SOLID STATE IONICS, 1996, 86-8 :703-709

[9] Oxygen surface exchange in mixed ionic electronic conductors:: Application La0.5Sr0.5Fe0.8Ga0.2O3-δ [J].

Kim, S ;

Wang, S ;

Chen, X ;

Yang, YL ;

Wu, N ;

Ignatiev, A ;

Jacobson, AJ ;

Abeles, B .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2000, 147 (06) :2398-2406

[10] Diffusion and surface exchange coefficients in mixed ionic electronic conducting oxides from the pressure dependence of oxygen permeation [J].

Kim, S ;

Yang, YL ;

Jacobson, AJ ;

Abeles, B .

SOLID STATE IONICS, 1998, 106 (3-4) :189-195

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