Synthesis and characterization of the composite with mixed conductivity for fuel cell

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(Institution)
Abstract
06-139 Ana Karolina Mayer Lima Chinelatto, A.L.(Universidade Estadual de Ponta Grossa); Lima, A.K.(Universidade Estadual de Ponta Grossa); Grzebielucka, E.C.(Universidade Estadual de Ponta Grossa); Chinelatto, A.S.(Universidade Estadual de Ponta Grossa); The use of fossil fuel for energy production has caused damage to the environment. In this scenario, fuel cells arise with one of the possibilities of generating clean and sustainable energy. One of the restrictions on the use of these fuel cells is at high operating temperatures. Several studies are being carried out in search of new materials that allow decreasing the operational temperature of these fuel cells. The present work aims at the synthesis of a composite with mixed ionic-proton conductivity to be used as a component of fuel cells with proton conductivity. The composite was formed by a phase with protonic conductivity, BaC0.2Zr0.7Y0.1O3-d (BCZY) and a phase with ionic conductivity, Sm0,2Ce0,8O2 (SCO). The powder of the BCZY phase was synthesized using the modified Pechini process, whereas for the SCO a commercial powder was used. The powders were mixed in a vibratory mill using a weight ratio of BCZY and SCO of 30:70, 50:50 and 70:30. The powders were pressed and sintered at 1400 °C for 4 h. The specimens were characterized by X-ray diffraction (XRD) using the Rietveld method, scanning electron microscopy (SEM), bulk density, apparent porosity and impedance spectroscopy. The results of the diffractograms indicated the presence of the individualized phases BCZY and SCO. The impedance spectroscopy measurements showed the presence of proton-ionic mixed conductivity.
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