Estudo da condutividade protônica do eletrólito sólido de cerato de bário dopado para uso em células a combustível de óxido sólido
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Data
2018-08-22
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Universidade Federal de Goiás
Resumo
The proton conductors have wide applications, such as in solid oxide fuel cells, hydrogen
separation membranes, hydrogen bombs, among others. These technologies are intended to
generating clean and sustainable energy. Among the materials with this property is the
BaCeO3 barium cerate, which presents low thermal activation energy for proton conductivity
in intermediate working temperature. However, due to its highly basic character, when in
operation in atmospheres with acid gases, such as CO2, SO2 and H2O this presents a certain
chemical instability. It is known in the literature that doping of BaCeO3 improves this
instability. In this work, pure BCO and yttrium doped cerium (BaCe1-xYxO3- δ / BCYO) was
synthesized by the polymer precursor method. The powders obtained in the syntheses will
be characterized by XRD and a mean crystallite size of 23 nm was obtained which indicates
the nanometric particle size. The pellets conformed and sintered at 1600 ºC with a 4-hour
plateau at a rate of 5 °C / min were then subjected to impedance spectroscopy tests and
showed where it was verified that doping with the 15% yttrium content presented the best
result with similar conductivity and activation energy lower than the pure sample.
Descrição
Palavras-chave
Cerato de bário, Eletrólito sólido, Células a combustível, Condutividade protônica, Espectroscopia de impedância, Barium cerate, Solide electrolyte, Fuel cells, Próton conductivity, Impedance spectroscopy
Citação
REZENDE, A. F. Estudo da condutividade protônica do eletrólito sólido de cerato de bário dopado para uso em células a combustível de óxido sólido. 2018. 38 f. (Dissertação Mestrado em Química) - Universidade Federal de Goiás, Catalão, 2018.