Catalisador ternário de PtRhSn0² disperso em carbono aplicado na reação de eletro-oxidação de glicerol

• Autor(a) principal: Junco, Gustavo Garcia
• Data de Publicação: 2017
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Espírito Santo (riUfes)
• Texto Completo: http://repositorio.ufes.br/handle/10/7822
• topic: Fossil fuels; Fuel cell; Electrocatalysts; Glycerol; Combustíveis fósseis; Eletrocatalisadores; Glicerol; Engenharia Química; Combustíveis; Biocombustíveis; Eletrocatálise; Células à combustível; 66.0

Currently, there is extensive discussion about energy issues, and due to the great apprehension related to the pollution generated by the use of fossil fuels and their probable scarcity, it is interesting to develop methods capable of supplying energy from renewable sources. Several research groups aim to develop fuel cells (FC’s) that operate with hydrogen or alcohols as fuel. However, a catalyst for direct alcohol fuel cell (DAFC) with high catalytic efficiency, tolerant to COads species poisoning and low cost was not found yet. In this work, PtRhSnO2/C electrocatalysts were developed and the results of electrochemical characterization using cyclic voltammetry (VC) showed that this catalyst has a profile similar to the polycrystalline platinum catalyst. These tests also allowed to identify the greater stability of PtRhSnO2/C in alkaline medium. The experiments performed by CV and chronoamperometry (CA) showed that the PtRhSnO2/C electrodes without thermal treatment (TT) and with TT had good catalytic activity for the electrooxidation of glycerol 0.5 mol L -1, since they demonstrated superior results to those obtained by the commercial platinum electrode (Pt/C 30% of E-TEK). It is important to note that the catalyst treated at 500 °C showed the best results in the tests performed by CV and CA. Also in this work, it was observed that the activation energy of the PtRhSnO2/C catalyst without TT decreases with the increase of temperature during the electrooxidation of glycerol. By means of the kinetic study, it was verified that PtRhSnO2/C without TT has less activation energy when compared to Pt/C 30% of E- TEK.