Characterisation of La0.6Sr0.4Co0.2Fe0.8O3-δ and Ba0.5Sr0.5Co0.8Fe0.2O3-δ as Cathode Materials for the Application in Intermediate Temperature Fuel Cells

被引：38

作者：

Ried, P. ^{[1
]}

Bucher, E.

Preis, W.

Sitte, W.

Holtappels, P. ^{[1
]}

机构：

[1] Empa, Swiss Fed Labs, Lab High Performance Ceram, CH-8600 Dubendorf, Switzerland

来源：

SOLID OXIDE FUEL CELLS 10 (SOFC-X), PTS 1 AND 2 | 2007年 / 7卷 / 01期

关键词：

D O I：

10.1149/1.2729221

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Capable materials for solid oxide fuel cell cathodes have to provide high electrocatalytic activity for oxygen reduction as well as sufficient electronic conductivity and good ionic transport properties (1). This study compares the electrical transport properties and the oxygen exchange properties of two promising cathode materials for operating temperatures between 600 and 800 degrees C: La0.6Sr0.4Co0.2Fe0.8O3-delta and Ba0.5Sr0.5Co0.8Fe0.2O3-delta Both materials were synthesized by spray pyrolysis and characterised with respect to phase purity and to the element ratio by XRD and ICP-AES analysis. The sintering behaviour of the calcined powders and the coefficients of thermal expansion of dense sintered samples were studied by dilatometry. As important parameters for the oxygen exchange reaction the chemical surface exchange coefficients ((K) over tilde) and chemical diffusion coefficients ((D) over tilde) as well as the electrical conductivities are compared.

引用

页码：1217 / 1224

页数：8

共 19 条

[1] Electrode kinetics of porous mixed-conducting oxygen electrodes [J].

Adler, SB ;

Lane, JA ;

Steele, BCH .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1996, 143 (11) :3554-3564

[2]

CHRISTIE GM, 1996, P 17 RIS INT S MAT S, P205

[3] Electrochemical characterization of La0.6Sr0.4Co0.2Fe0.8O3 cathodes for intermediate-temperature SOFCs [J].

Esquirol, A ;

Brandon, NP ;

Kilner, JA ;

Mogensen, M .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2004, 151 (11) :A1847-A1855

[4] Thermal expansion of Gd-doped ceria and reduced ceria [J].

Hayashi, H ;

Kanoh, M ;

Quan, CJ ;

Inaba, H ;

Wang, SR ;

Dokiya, M ;

Tagawa, H .

SOLID STATE IONICS, 2000, 132 (3-4) :227-233

[5] Oxygen transport in La0.6Sr0.4Co0.2Fe0.8O3-δ [J].

Lane, JA ;

Benson, SJ ;

Waller, D ;

Kilner, JA .

SOLID STATE IONICS, 1999, 121 (1-4) :201-208

[6]

OTTER MW, 2001, J ELECTROCHEM SOC, V148, P1

[7] Evaluation of La-Sr-Co-Fe-O perovskites for solid oxide fuel cells and gas separation membranes [J].

Petric, A ;

Huang, P ;

Tietz, F .

SOLID STATE IONICS, 2000, 135 (1-4) :719-725

[8] Oxygen exchange kinetics of La0.4Sr0.6FeO3-δ by simultaneous application of conductivity relaxation and carrier gas coulometry [J].

Preis, W ;

Bucher, E ;

Sitte, W .

SOLID STATE IONICS, 2004, 175 (1-4) :393-397

[9] Characterization of perovskite powders for cathode and oxygen membranes made by different synthesis routes [J].

Sfeir, J ;

Vaucher, S ;

Holtappels, P ;

Vogt, U ;

Schindler, HJ ;

Van Herle, J ;

Suvorova, E ;

Buffat, P ;

Perret, D ;

Xanthopoulos, N ;

Bucheli, O .

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2005, 25 (12) :1991-1995

[10] A high-performance cathode for the next generation of solid-oxide fuel cells [J].

Shao, ZP ;

Haile, SM .

NATURE, 2004, 431 (7005) :170-173

← 1 2 →