## Synthesis of the PrNi0.8Co0.2O3 and LaNi0.8Co0.2O3 cathodes by the gelatin method for application in solid oxide fuel cells (SOFC).

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Abstract
13-007 Thaís de Oliveira Almeida Queiroz, D.F.(Universidade Federal da Paraíba); Aquino, F.d.(Universidade Federal da Paraíba); Silva, F.F.(Universidade Federal da Paraíba); Almeida, T.d.(Universidade Federal da Paraíba); da Silva, I.B.(Universidade Federal da Paraíba); Aires, V.V.(Universidade Federal da Paraíba); At present, due to the increase in the usage of fossil fuels along with environment degradation, an opportunity arises for alternative sources of electrical energy, among them the fuel cells, and specifically, the study of solid oxide fuel cells has been intensified in recent years, for operation at intermediate temperature. Fuel cells are devices that transform chemical energy from oxidation and reduction reactions, into electrical current. Its composition basically contains two electrodes (anode and cathode), electrolyte and interconnects. The cathode of the solid oxide fuel cell (SOFC), being ${\mathrm{PrNi}}_{0.8}{\mathrm{Co}}_{0.2}{\mathrm{O}}_{3}$ and ${\mathrm{LaNi}}_{0.8}{\mathrm{Co}}_{0.2}{\mathrm{O}}_{3}$ , demonstrated to be quite promising for their operation at intermediate temperatures (500 – 800 ºC). In this work, the cathodic materials were synthesized by the gelatin method, in which the gelatin acts as a polymerizing and coordinating agent. The obtained powders were characterized by X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The peroviskite phase was evidenced in all X-ray diffractograms in both cathodic materials and SEM images showed that the powder obtained was very porous, which favors its use as potential cathodic material. After the preliminary characterizations of the microstructure, ${\mathrm{PrNi}}_{0.8}{\mathrm{Co}}_{0.2}{\mathrm{O}}_{3}$ and ${\mathrm{LaNi}}_{0.8}{\mathrm{Co}}_{0.2}{\mathrm{O}}_{3}$ were deposited by the screen-printing method to carry out studies on the thermal treatment for their deposition in ${\mathrm{Ce}}_{0.9}{\mathrm{Gd}}_{0.1}{\mathrm{O}}_{2-\mathrm{\delta }}$ (CGO) electrolytes.
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