Combustion synthesis of La0.7Sr0.3Co0.5Fe0.5O3 (LSCF) porous materials for application as cathode in IT-SOFC

被引：80

作者：

da Conceicao, Leandro ^{[1
]}

Silva, Amanda M. ^{[1
]}

Ribeiro, Nielson F. P. ^{[2
]}

Souza, Mariana M. V. M. ^{[1
]}

机构：

[1] Univ Fed Rio de Janeiro, Escola Quim, Ctr Tecnol, BR-21941909 Rio de Janeiro, Brazil

[2] Univ Fed Rio de Janeiro, Ctr Tecnol, NUCAT PEQ COPPE, BR-21945970 Rio de Janeiro, Brazil

来源：

MATERIALS RESEARCH BULLETIN | 2011年 / 46卷 / 02期

关键词：

Ceramics; Chemical synthesis; X-ray diffraction; Electrical properties; Microstructure; OXIDE FUEL-CELLS; ELECTRICAL-PROPERTIES; LOW-TEMPERATURE; LA0.7SR0.3MNO3; NANOPOWDERS;

D O I：

10.1016/j.materresbull.2010.10.009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

La0.7Sr0.3Co0.5Fe0.5O3 (LSCF) porous materials have attracted a substantial interest for application as cathode in solid oxide fuel cells of intermediate temperature (IT-SOFC). This work investigates the effect of different propellants (urea, glycine, citric acid and sucrose) in the preparation of LSCF powders by the combustion method and also the influence of the sintering temperature on the porosity and electrical conductivity. TGA profiles of the as-prepared samples showed a lower weight loss for the sample prepared with glycine, associated with the higher combustion temperature. XRD patterns presented characteristic reflections of LSFC perovskite and a small formation of secondary phases, with nanometric crystallite sizes (9-20 nm). SEM analysis revealed the loose and porous structure of the powder materials. Densification studies were carried within 950-1100 degrees C, showing that porosity decreased with increasing sintering temperature. Electrical conductivity was measured in the temperature range 300-800 degrees C and correlated with the sintering temperature. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：308 / 314

页数：7

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