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Cerâmica

versão impressa ISSN 0366-6913versão On-line ISSN 1678-4553

Resumo

VARGAS, R. A.; CHIBA, R.; ANDREOLI, M.  e  SEO, E. S. M.. Synthesis and characterization of La1-XSrXMnO δ and La1-XSrXCo1-YFeYO3- δ used as cathode in solid oxide fuel cells. Cerâmica [online]. 2008, vol.54, n.331, pp.366-372. ISSN 0366-6913.  http://dx.doi.org/10.1590/S0366-69132008000300016.

In the synthesis of ceramic materials, new challenges are related with the intrinsic properties. Consequently, researchers look for alternative materials with adjusted characteristics for components in solid oxide fuel cells. Currently, the most studied materials as cathode are oxides: La1-XSrXMnOδ and La1-XSrXCo1-YFeYO3-δ. In this work, the nitrates of the respective chemical elements were used as raw materials. The objective of this work is to present the physical, chemical and microstructural characteristics of these materials, prepared by the citrate technique. The main analyses utilized were: thermogravimetric analysis, differential scanning calorimetry, gas helium picnometry, X-ray fluorescence spectroscopy, gas adsorption, laser scattering granulometry, X-ray diffraction and scanning electron microscopy. The results show that the studied compositions present homogeneous particles with little residual carbon, suitable specific surface area and particle size less than 1 mm. The studied properties are compatible with literature information. The main results show that the composition synthesized by the citrate technique may be useful for preparing ceramic suspensions for thin films.

Palavras-chave : solid oxide fuel cell; cathode; citrate technique; LSM; LSCF.

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