Citrate–hydrothermal synthesis, structure and electrochemical performance of La0.6Sr0.4Co0.2Fe0.8O3−δ cathodes for IT-SOFCs

dc.creatorGarcia, Laurênia Martins Pereira
dc.creatorMacedo, Daniel Araújo de
dc.creatorSouza, Graziele L.
dc.creatorMotta, Fabiana Villela da
dc.creatorPaskocimas, Carlos Alberto
dc.creatorNascimento, Rubens Maribondo do
dc.date2022-01-12T14:18:32Z
dc.date2022-01-12T14:18:32Z
dc.date2013
dc.identifierGARCIA, Laurenia M.P.; MACEDO, Daniel A.; SOUZA, Graziele L.; MOTTA, Fabiana V.; PASKOCIMAS, Carlos A.; NASCIMENTO, Rubens M.. Citrate–hydrothermal synthesis, structure and electrochemical performance of La0.6Sr0.4Co0.2Fe0.8O3−δ cathodes for IT-SOFCs. Ceramics International, [S.L.], v. 39, n. 7, p. 8385-8392, set. 2013. Elsevier BV. Disponível em: https://www.sciencedirect.com/science/article/pii/S0272884213004094?via%3Dihub. Acesso em: 23 fev. 2021. http://dx.doi.org/10.1016/j.ceramint.2013.04.019
dc.identifierhttps://repositorio.ufrn.br/handle/123456789/45596
dc.identifierhttp://dx.doi.org/10.1016/j.ceramint.2013.04.019
dc.descriptionLa0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) powders were synthesized by a combination of citrate and hydrothermal methods. The thermal decomposition behavior of the as-prepared powder was carried out by simultaneous thermogravimetry–differential thermal analysis. The calcined powders were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and particle size distribution (PSD). Screen-printed LSCF/CGO/LSCF symmetrical cells were sintered between 1150 and 1200 °C and studied by impedance spectroscopy in order to assess the cathode kinetics for the oxygen reduction reaction. Rietveld refinement of XRD data showed the formation of a single perovskite LSCF phase with crystallite size of 53 nm at 900 °C. The best area specific resistance (ASR) value, measured in static air, was found to be 0.34 Ω cm2 at 750 °C, demonstrating that the novel citrate–hydrothermal method is an effective way to prepare cathode materials for SOFC. Cathode performance can be further enhanced by additional surface modification through impregnation with Pr-containing solution, reaching 0.17 Ω cm2 at 750 °C. Furthermore, the activation energy of the PrOx-impregnated cathode is 83.4 kJ/mol, i.e., much lower than 123.8 kJ/mol, the best value determined for PrOx-free cathodes
dc.languageen
dc.publisherElsevier
dc.subjectCitrate–hydrothermal method
dc.subjectLSCF
dc.subjectMicrostructure
dc.subjectPraseodymium oxide
dc.subjectImpedance spectroscopy
dc.titleCitrate–hydrothermal synthesis, structure and electrochemical performance of La0.6Sr0.4Co0.2Fe0.8O3−δ cathodes for IT-SOFCs
dc.typearticle


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