Investigation of the mechanism of glycerol electro-oxidation on metallic nanoparticlesPROPOSERS:Dra. Amanda Cristina Garcia (Candidate)Prof. Dr. Germano Tremiliosi Filho (Superviser)ABSTRACTGlycerol electro-oxidation by direct pathway, leading CO2 and H2O, involves the transfer of 14 electrons per molecule. This has attracted great interest for its use as fuel at the anode of fuel cell. For the total oxidation, it is necessary to break of the C-H and C-C bonds and the formation of O-C-O. In acid electrolyte, on Pt electrocatalysts, the reaction following parallel paths leading to tartronic acid, glycolic acid, glyoxylic acid, formic acid and carbon dioxide. In alkaline electrolyte, on Au electrode, was observed the formation of dihydroxyacetone, tartronic acid, mesoxalic acid, glyoxylic acid and carbon dioxide. For both electrode materials, Pt and Au, carbon dioxide was detected indicating a possible C-C bond break. In this context, its is important understand the reaction mechanism and the development of electrocatalysts that lead to selective glycerol oxidation to CO2. Among the materials studied to enhance the oxidation efficiency in acid electrolyte, bimetallic nanoparticles based by Pt-Pd-Ru showed good activity to glycerol oxidation, while in alkaline electrolyte Pd based materials are promising.This work aims to advance the understanding of the mechanism and the development of the active electrocatalysts towards glycerol oxidation. The electrocatalysts will be formed by Pt and Pd based nanoparticles alloyed with Ru and Rh atoms, in acid electrolyte and with Pt, Pd and Au atoms, in alkaline electrolyte, all materials will be supported onto carbon powder. The reaction pathways followed in the different nanoparticle will be investigated by FTIR (Fourier Transform Infrared Spectroscopy) in situ, DEMS (Differential Electrochemical Mass Spectrometry) on line and HPLC (High Performance Liquid Chromatography), associated with electrochemical techniques like cyclic voltammetry and chronoamperometry.
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