Síntese e estudo de eletrocatalisadores ternários de PtSCu/C para a oxidação de etanol com aplicação em células a combustível do tpo PEM
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2014-02-24
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Universidade Federal de Goiás
Resumo
The research presented below is a study of the synthesized metal
electrocatalysts, which have the purpose of being applied as catalytic
electrodes in fuel cells fed with direct ethanol in order to complete oxidation of
the fuel, the low potential. Thus, nanoparticles of platinum, tin and copper
combined as Pt100/C, Pt75Sn25/C Pt75Cu25/C and Pt33Sn33Cu33/C was prepared
using the method of reducing via reflux of ethanol and supported on Vulcan XC-
72R carbon® High surface area metal mass 20%. The catalysts were
characterized by X-ray Diffraction, X-Ray Spectroscopy Energy Dispersive,
Transmission Electron Microscopy. The analysis results proved the actual
composition of the material, its morphology and how the particles clump
together when conditioned on a microscopic layer. It also allowed me to know
the average crystallite size of the electrocatalysts. Electrochemical experiments
showed the difference in the catalytic activities of each material and allowed to
note that the insertion of copper to PtSn / C reduces the potential for ethanol
oxidation. The catalytic performance was also studied through experiments with
fuel cells and Stripping of CO, in which the results were obtained, as the power
density and the active area of the catalysts. By Infrared Spectroscopy was possible to verify in situ the formation of intermediate from the development of
the oxidation of alcohol and it was inferred that PtSnCu/C produces CO2 in
ethanol electrooxidation at lower potentials compared to PtSn/C-ETEK® and
Pt/C-ETEK®.
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MAGALHÃES, Monah Marques. Síntese e estudo de eletrocatalisadores ternários de PtSCu/C para a oxidação de etanol com aplicação em células a combustível do tpo PEM. 2014. 73 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Goiânia, 2014.