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Synthesis and characterization of pure-phase La0.75Sr0.25Cr0.5Mn0.5O3−δ nanocrystallites for solid oxide fuel cell applications

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Abstract

Nanopowders of La0.75Sr0.25Cr0.5Mn0.5O3−δ (LSCM) perovskite-type oxide, potential electrode material for symmetrical solid oxide fuel cell (S-SOFC), have been successfully prepared by the solution combustion method employing glycine as complexing agent and fuel. Several glycine-to-nitrates molar ratios were investigated. A detailed morphological and structural characterization was performed, employing X-ray diffraction, N2 physisorption, and electron microscopy (scanning and transmission). The as-synthesized LSCM nanopowders consist of interconnected nanoparticles forming a sponge-like structure with typical meso- and macropores. For glycine-to-nitrates molar ratios above stoichiometric molar ratio, a high proportion of well-crystallized LSCM phase was obtained. An increase of glycine content in the initial synthesis gel, decreases the average nanoparticles size from ~20 to ~6 nm, narrows the distribution crystallite size, and increases the specific surface area of the LSCM nanopowders from ~14 to ~30 m2/g. The evolution of crystalline phases of the as-synthesized LSCM nanopowders after calcination at various temperatures was studied: pure-phase La0.75Sr0.25Cr0.5Mn0.5O3−δ perovskites with particle-size distribution between 100 and 300 nm, have been obtained after calcination at 1,000 °C for 6 h. The crystalline structural analyses showed that the LSCM nanocrystallites have trigonal/rhombohedral symmetry in the R-3c space group. These final LSCM nanopowders present microstructures with low densification and open porosity but probably with sufficient integrity to enable them to be used as efficient electrodes in S-SOFC.

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Acknowledgments

This study was supported by the CONICET and CAB-CNEA of Argentina. C.M.C. thanks Eng. Luisa Fernández Albanesi and Dr. Fabiana Gennari for the N2 adsorption measurements.

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Authors and Affiliations

  1. Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, Av. Ezequiel Bustillo 9500, R8402AGP, San Carlos de Bariloche, Río Negro, Argentina

    Corina M. Chanquía, Jesús E. Vega-Castillo, Analía L. Soldati, Horacio Troiani & Alberto Caneiro

  2. CONICET, Avenida Rivadavia 1917, C1033AAJ, Buenos Aires, Argentina

    Corina M. Chanquía, Jesús E. Vega-Castillo, Analía L. Soldati, Horacio Troiani & Alberto Caneiro

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  1. Corina M. Chanquía
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  2. Jesús E. Vega-Castillo
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  3. Analía L. Soldati
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  4. Horacio Troiani
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  5. Alberto Caneiro
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Correspondence to Corina M. Chanquía or Alberto Caneiro.

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Chanquía, C.M., Vega-Castillo, J.E., Soldati, A.L. et al. Synthesis and characterization of pure-phase La0.75Sr0.25Cr0.5Mn0.5O3−δ nanocrystallites for solid oxide fuel cell applications. J Nanopart Res 14, 1104 (2012). https://doi.org/10.1007/s11051-012-1104-1

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