Structure, densification and electrical properties of Gd3+ and Cu2+ co-doped ceria solid electrolytes for SOFC applications
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2018
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BRAZILIAN MRS MEETING, 17th
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The current energy needs are still met by the use of fossil fuels. Due to the
increasing demand for new energy sources, solid oxide fuel cell has proven to be
a good alternative. However, the development of this technology is limited by
needs high operation temperature. Ceria-based solid electrolytes have been
considered a promising material due to better ionic conductivities in comparison
to traditional yttria-stabilized zirconia ceramics. The main disadvantage of ceriabased
electrolyte is the need for high sintering temperatures for complete
densification. Transition metal oxides exhibiting low melting points, such as CuO,
have been used as additives to lower the sintering temperature of these materials
[1]. In this scenario, the present work is focused on the evaluation of the effects of
gadolinium oxide (Gd2O3) content and small quantity of CuO on the structure,
densification and electrical properties of ceria solid solutions [2]. Nominal
compositions of Ce0.99−xGdxCu0.01O2-δ (0≤x≤0.3) were synthesized by the polymeric
precursor method. The calcined powders were studied by XRD and Rietveld
refinement to obtain crystallographic parameters. The sinterability of green
bodies was evaluated by dilatometry up to 1200 °C. The electrical properties were
investigated by impedance spectroscopy. The electrical conductivity was
enhanced by gadolinium addition, reaching a maximum of 7.81 mS cm−1 at 600 °C
for the composition x=0.15 sintered at a temperature as low as 1050 °C.
Como referenciar
SILVA, THAMYSCIRA H.S.; GRILO, JOÃO P.F.; ARAUJO, ALLAN J.M.; LOUREIRO, FRANCISCO J.A.; FAGG, DUNCAN P.; FONSECA, FABIO C.; MACEDO, DANIEL A. Structure, densification and electrical properties of Gd3+ and Cu2+ co-doped ceria solid electrolytes for SOFC applications. In: BRAZILIAN MRS MEETING, 17th, September 16-20, 2018, Natal, RN. Abstract... São Carlos: Aptor Software, 2018. p. 911-912. Disponível em: http://repositorio.ipen.br/handle/123456789/30323. Acesso em: 26 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.