Estudo da inserção de grafeno em catalisadores de PtSn para a oxidação de etanol
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2022-02-21
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Universidade Federal de Goiás
Resumo
Fuel cells are portable electrochemical converters that generate
electricity using renewable fuels and can act as high-efficiency energy
sources. When fed with ethanol, they lose performance due to electrode
poisoning. To mitigate this problem, noble metals are used in the electrodes in
addition to the addition of elements to the electrocatalysts, increasing the
production cost while the problem persists. Thus, this study seeks to increase
the efficiency of ethanol oxidation by modifying the carbon support with
graphene, where the metallic phase is anchored, and to verify its influence on
the general catalysis process. Electrocatalysts with carbon-graphene hybrid
support were synthesized in different proportions, and a physical mixture of
graphene with the carbon-supported electrocatalyst was prepared. Hybrid
supported electrocatalysts showed higher electrochemical activity and stability
in ethanol oxidation compared to carbon supported electrocatalyst, with an
increase of 132% in alkaline medium. In the physical mixture, the addition of
graphene generated a 10% decrease in the amount of metallic phase needed,
obtaining the same performance as the pure electrocatalyst. While in acidic
medium, in addition to the 10% decrease, the physical mixture exhibited a
much superior performance to the pure electrocatalyst. The results showed
that the influence of graphene depends on its interaction with the
electrocatalyst, while promoting an increase in the performance of ethanol
oxidation.
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BASTOS, T. L. Estudo da inserção de grafeno em catalisadores de PtSn para a oxidação de etanol. 2022. 69 f. Dissertação (Mestrado em Química) - Instituto de Química, Universidade Federal de Goiás, Goiânia, 2022.