Ceramics-Silikáty 58, (1) 46 - 49 (2014) |
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THERMAL EXPANSION BEHAVIOR OF THE Ba0.2Sr0.8Co0.8Fe0.2O3−δ (BSCF) WITH Sm0.2Ce0.8O1.9
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Ahmadrezaei M. 1,2, Muhammed Ali S. A. 1, Muchtar A. 2,1,
Tan C. Y. 3,
Somalu M. R. 1
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1 Fuel Cell Institute, Universiti Kebangsaan Malaysia,
43600 UKM Bangi, Selangor, Malaysia
2 Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia,
43600 UKM Bangi, Selangor, Malaysia
3 Department of Engineering Design and Manufacturing, Advanced Manufacturing and Material Processing (AMMP) Centre,
University of Malaya, 50603 Kuala Lumpur, Malaysia
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Keywords: Nanomaterial perovskites, Cathode materials, Solid oxide fuel cell, BSCF, Thermal expansion coefficient
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Nanostructured perovskite oxides of Ba0.2Sr0.8Co0.8Fe0.2O3−δ (BSCF) were synthesized through the co-precipitation method. The
thermal decomposition, phase formation and thermal expansion behavior of BSCF were characterized by thermogravimetric
analysis, X-ray diffraction (XRD), and dilatometry, respectively. XRD peaks were indexed to a cubic perovskite structure
with a Pm3m (221) space group. All the combined oxides produced the desired perovskite-phase BSCF. The microstructures
were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The TEM analysis
showed that BSCF powders had uniform nanoparticle sizes and high homogeneity. The cross-sectional SEM micrograph of
BSCF exhibited a continuous and no delaminated layer from the electrolyte-supported cell. The thermal expansion coefficient
(TEC) of BSCF was 16.2x10-6 K-1 at a temperature range of 600oC to 800oC. Additional experiments showed that the TEC of
BSCF is comparable to that of Sm0.2Ce0.8O1.9 (SDC) within the same temperature range. The results demonstrate that BSFC
is a promising cathode material for intermediate-temperature solid-oxide fuel cells.×° |
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