Reaction model of dense Sm0.5Sr0.5CoO3 as SOFC cathode

被引：189

作者：

Fukunaga, H

Koyama, M

Takahashi, N

Wen, C

Yamada, K

机构：

[1] Shinshu Univ, Dept Fine Mat Engn, Ueda, Nagano 3868567, Japan

[2] Univ Tokyo, Dept Chem Syst Engn, Bunkyo Ku, Tokyo 1138656, Japan

来源：

SOLID STATE IONICS | 2000年 / 132卷 / 3-4期

关键词：

solid oxide fuel cell; SmSrCoO3; dense electrode; cathodic reaction model; adsorption; desorption; rate constant; interfacial conductivity;

D O I：

10.1016/S0167-2738(00)00642-1

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：

Overpotential and AC impedance spectra were measured to study the reaction model of dense Sm0.5Sr0.5CoO3 (SSC) as SOFC cathode. From the P-O2 dependence of interfacial conductivity, the rate determining step of dense SSC electrode was adsorption and desorption processes at the surface of the electrode. Rate constants of adsorption and desorption were calculated from the interfacial conductivity of the dense electrode to be 3 x 10(-5) mol cm(-2) s(-1) atm(-1) and 2 x 10(-8) mol cm(-2) s(-1), respectively. These were approximately one order of magnitude larger than the corresponding values calculated for La0.6Sr0.4CaO3. These rate constants can elucidate the overpotentials of porous electrodes. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：279 / 285

页数：7

共 14 条

[1] BOUKAMP BA, 1992, CT89214128 U TWENT
[2] OXYGEN-TRANSPORT IN SELECTED NONSTOICHIOMETRIC PEROVSKITE-STRUCTURE OXIDES
CARTER, S
SELCUK, A
CHATER, RJ
KAJDA, J
KILNER, JA
STEELE, BCH
[J]. SOLID STATE IONICS, 1992, 53 : 597 - 605
[3] Cathodic reaction mechanism for dense Sr-doped lanthanum manganite electrodes
Endo, A
Ihara, M
Komiyama, H
Yamada, K
[J]. SOLID STATE IONICS, 1996, 86-8 (86-88) : 1191 - 1195
[4] ENDO A, 2000, IN PRESS SOLID STATE
[5] The relationship between overpotential and the three phase boundary length
Fukunaga, H
Ihara, M
Sakaki, K
Yamada, K
[J]. SOLID STATE IONICS, 1996, 86-8 : 1179 - 1185
[6] CRYSTALLOGRAPHIC, THERMAL AND ELECTROCHEMICAL PROPERTIES OF THE SYSTEM LA1-XSRXMNO3 FOR HIGH-TEMPERATURE SOLID ELECTROLYTE FUEL-CELLS
HAMMOUCHE, A
SIEBERT, E
HAMMOU, A
[J]. MATERIALS RESEARCH BULLETIN, 1989, 24 (03) : 367 - 380
[7] Intermediate temperature solid oxide fuel cells using a new LaGaO3 based oxide ion conductor -: I.: Doped SmCoO3 as a new cathode material
Ishihara, T
Honda, M
Shibayama, T
Minami, H
Nishiguchi, H
Takita, Y
[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1998, 145 (09) : 3177 - 3183
[8] Surface exchange of oxygen in mixed conducting perovskite oxides
Kilner, JA
DeSouza, RA
Fullarton, IC
[J]. SOLID STATE IONICS, 1996, 86-8 : 703 - 709
[9] Diffusion and surface exchange coefficients in mixed ionic electronic conducting oxides from the pressure dependence of oxygen permeation
Kim, S
Yang, YL
Jacobson, AJ
Abeles, B
[J]. SOLID STATE IONICS, 1998, 106 (3-4) : 189 - 195
[10] Ionic conductivity of ceria/yttria stabilized zirconia electrolyte materials
Sammes, NM
Cai, ZH
[J]. SOLID STATE IONICS, 1997, 100 (1-2) : 39 - 44

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