O desenvolvimento de nanopartículas de intermetálicos ordenados de ouro e estudo da atividade eletroquímica da reação de oxidação do glicerol

• Ano de defesa: 2015
• Autor(a) principal: Barrezzi, Karina [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Nanopartículas; Ouro; Glicerina; Oxidação; Nanoparticles
• Link de acesso: http://hdl.handle.net/11449/135919; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/24-02-2016/000858098.pdf

In the present work, we studied the oxidation reaction of glycerol, in alkaline medium (KOH), on the surface of Au/C, AuSn/C e Au2Bi/C materials, synthesized by microemulsion, and Au/Sn/C and Au2Bi/C, by reduction of polyol. The physical characterization of materials was performed by XRD and EDX. By diffractograms obtained it was found that, by the microemulsion method, AuSn/C and Au2Bi/C alloys have been formed, and by the polyol reduction method, occurred cluster formation consisting of Au and Sn, and a material formed by the Au2Bi/C alloy and Bi. The AuSn/C alloy showed no significant variation in the atomic composition obtained by EDX in relation to the nominal atomic ratio, indicating that the microemulsion method was effective in preparing this material. However, the cluster, despite having reproducibility from various points analyzed did not show the expected atomic composition. In relation to the materials formed by Bi, these showed no coherence in the results obtained by EDX. The electrochemical characterization of the surface was accomplished by cyclic voltammetry. The electrochemical performance of the material against glycerol electrooxidation was assessed both by voltammetry and by chronoamperometry. All materials presented electrochemical performance, but the AuSn/C showed the best results, probality due to an electronic effect, and a possible bifunctional effect