Electrochemical properties of lanthanum strontium aluminum ferrites for the oxygen reduction reaction

被引：36

作者：

Coffey, GW ^{[1
]}

Hardy, J ^{[1
]}

Pedersen, LR ^{[1
]}

Rieke, PC ^{[1
]}

Thomsen, EC ^{[1
]}

Walpole, M ^{[1
]}

机构：

[1] Pacific NW Natl Lab, Mat Synth & Modificat Grp, Richland, WA 99352 USA

来源：

SOLID STATE IONICS | 2003年 / 158卷 / 1-2期

关键词：

solid oxide fuel cell; cathode; oxygen reduction reaction; lanthanum strontium ferrite; lanthanum strontium aluminum ferrite;

D O I：

10.1016/S0167-2738(02)00174-1

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：

The oxygen reduction reaction was studied on the La1 - xSrxAlyFe1 - yO3 (x=0.2, y=0.1, 0.2, 0.3, 0.4) s stem by cyclic voltametry and electronic conductivity. Activation energies for the bulk and film conductivities were determined. Tafel analysis afforded the activation energies "from the temperature dependence of the exchange current densities" as well as the charge transfer coefficient. The electrical conductivity of bulk material was found to decrease with aluminum content. Formation of the materials into thin porous films further decreased the conductivity after correcting for porosity. Aluminum substitution. substantially decreased the performance through influence of the pre-exponential factor in the Butler-volmer formulation. Neither the activation energies nor the charge transfer coefficient for these materials varied significantly. Aluminum does not adversely influence the basic mechanism of oxygen reduction. It may occupy and block electrochemically active sites on the electrode surface, but it does not appear to decrease the intrinsic activity of available surface sites. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：1 / 9

页数：9

共 21 条

[1] GLYCINE NITRATE COMBUSTION SYNTHESIS OF OXIDE CERAMIC POWDERS [J].

CHICK, LA ;

PEDERSON, LR ;

MAUPIN, GD ;

BATES, JL ;

THOMAS, LE ;

EXARHOS, GJ .

MATERIALS LETTERS, 1990, 10 (1-2) :6-12

[2] Electrical and microstructural characterisation of (La0.8Sr0.2)(Fe1-xAlx)O-3 and (La0.8Sr0.2)(Mn1-xAlx)O-3 as possible SOFC cathode materials [J].

Holc, J ;

Kuscer, D ;

Hrovat, M ;

Bernik, S ;

Kolar, D .

SOLID STATE IONICS, 1997, 95 (3-4) :259-268

[3]

HORVAT M, 1996, MAT SCI LETT, V15, P339

[4] Chemical compatibility of the LaFeO3 base perovskites (La0.6Sr0.4)(z)Fe(0.8)M(0.2)O(3-delta) (z=1, 0.9; M=Cr, Mn, Co, Ni) with yttria stabilized zirconia [J].

Kindermann, L ;

Das, D ;

Nickel, H .

SOLID STATE IONICS, 1996, 89 (3-4) :215-220

[5] Chemical reactivity of perovskite oxide SOFC cathodes and yttria stabilized zirconia [J].

Kostogloudis, GC ;

Tsiniarakis, G ;

Ftikos, C .

SOLID STATE IONICS, 2000, 135 (1-4) :529-535

[6] Some characteristics of Al2O3- and CaO-modified LaFeO3-based cathode materials for solid oxide fuel cells [J].

Kuscer, D ;

Hrovat, M ;

Holc, J ;

Bernik, S ;

Kolar, D .

JOURNAL OF POWER SOURCES, 1996, 61 (1-2) :161-165

[7]

Kuscer D, 1998, J POWER SOURCES, V71, P195, DOI 10.1016/S0378-7753(97)02754-7

[8] INTERACTIONS BETWEEN A THICK-FILM LAMNO3 CATHODE AND YSZ SOFC ELECTROLYTE DURING HIGH-TEMPERATURE AGING [J].

KUSCER, D ;

HOLC, J ;

HROVAT, M ;

BERNIK, S ;

SAMARDZIJA, Z ;

KOLAR, D .

SOLID STATE IONICS, 1995, 78 (1-2) :79-85

[9]

KUSCER D, 1995, P 10 EUR MICR C ISM

[10] LA2ZR2O7 FORMED AT CERAMIC ELECTRODE YSZ CONTACTS [J].

LABRINCHA, JA ;

FRADE, JR ;

MARQUES, FMB .

JOURNAL OF MATERIALS SCIENCE, 1993, 28 (14) :3809-3815

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