Synthesis and characterization of LaCoO3 and LaNiO3 perovskites obtained by the gelatin method used as cathodes in SOFCs

Reference	Presenter	Authors (Institution)	Abstract
13-010	Iago Bezerril da Silva	da Silva, I.B.(Universidade Federal da Paraíba); Aquino, F.d.(Universidade Federal da Paraíba); Queiroz, D.F.(Universidade Federal da Paraíba); Almeida, T.d.(Universidade Federal da Paraíba); Aires, V.V.(Universidade Federal da Paraíba); Silva, F.F.(Universidade Federal da Paraíba);	Researches involving alternative and renewable energies have been increasing due to concerns about the environment and the availability of its resources. Among these, the oxide-solid fuel cells (SOFCs) stand out, which are devices that convert chemical energy into electrical energy through an oxy-reduction reaction. Therefore, the perovskites of lanthanum cobaltite (${\mathrm{LaCoO}}_3$) and lanthanum nickelate (${\mathrm{LaNiO}}_3$) have been studied as cathodes of SOFCs, because they have good electronic conduction properties. In this work, both perovskites were obtained by the gelatin method. In this method, the gelatin was used as polymer of large molecular chain, replacing the alpha-hydroxycarboxylics and polihydroxy-alcohol compounds used in the Pechini method, to obtain precursor powders. The obtained powders were calcined at 1000 ° C for 4 hours. After that, they were characterized by X-Ray Diffraction (XRD) to observe the formation of the perovskite structure and the quantification of the desired phase. Subsequently, it was made the deposition of these materials by the screen-printing method on ${\mathrm{Ce}}_{0,9}{\mathrm{Gd}}_{0,1}{\mathrm{O}}_{2-\mathrm{\delta }}$ (CGO) pellets. These CGO pellets were manufactured by isostatic pressure and sintered at 1450 ºC. And then, a study was made to identify the sintering temperature of the materials to the CGO pallets and the evaluation of their microstructures.
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