Synthesis and electrical characterization of the ceramic anode La 1-x Srx Mn0.5 Cr0.5 O3
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Journal of the Electrochemical Society
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The synthesis and electrical characterization of La1-x Srx Mn0.5 Cr0.5 O3 compounds are reported. These compounds, with perovskite structure, have been pointed out as a promising alternative for the nickel-based cermet anode of solid oxide fuel cells. Polycrystalline samples, with x=0.3, 0.4, and 0.5, were prepared by the citrate technique. The crystalline phase and the chemical compatibility with zirconia-based electrolytes were studied by X-ray diffraction analyses. The electrical properties were studied by four-probe dc electrical conductivity (T) measurements during redox cycles under both oxidizing and reducing atmospheres. The main results show that the (T) has a thermally activated behavior, and increasing Sr content increases (T). Compounds with x=0.3 exhibited no appreciable chemical reaction with the stabilized zirconia electrolyte after heat-treatment at high temperature. The (T) measurements evidenced the redox stability of the ceramic anode. However, some degradation of the (T) was observed on samples thermally treated at 1000°C under pure hydrogen.
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FONSECA, F.C.; MUCCILLO, E.N.S.; MUCCILLO, R.; FLORIO, D.Z. de. Synthesis and electrical characterization of the ceramic anode La 1-x Srx Mn0.5 Cr0.5 O3. Journal of the Electrochemical Society, v. 155, n. 5, p. B483-B487, 2008. DOI: 10.1149/1.2885099. Disponível em: http://repositorio.ipen.br/handle/123456789/4973. Acesso em: 30 Dec 2025.
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