EGBERTO GOMES FRANCO
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Artigo IPEN-doc 22129 Ethanol fuel cell: new electrocatalysts systems2005 - FRANCO, EGBERTO G.; LINARDI, MARCELO; COLOSIO, MARCO A.Ethanol fuel cell has major drawbacks to be overcame. Electrocatalysts systems are one of the major concerns in the development of ethanol fuel cells. In this work we synthesized two different systems: PtRuDy and PtU. PtRuDy shows electroactivities similar to Pt3Sn, that is pointed out as the best catalyst for ethanol oxidation. PtU shows a promise result when operated with ethanol and after this with hydrogen and oxygen again. It is well established that electrocatalysts systems as PtRu when operated with alcohols these systems shows a huge degradation when operating with hydrogen again. PtRuDy system shows 46% of degradation while operating with ethanol and turning back to hydrogen. PtU system shows no degradation at all after operating with ethanol 1.0 mol L-1 and turning to hydrogen again.Artigo IPEN-doc 21318 Catalysts for fuel cell: production and characterization2005 - FRANCO, EGBERTO G.; LINARDI, MARCELOFuel cells technology is one of the most promising technologies for this century to deal with energy sustainability. In order to improve fuel cells performances the search for new electrocatalysts has a great importance in this technology. The colloidal method was chosen to produce the catalysts because a good nanocrystal distribution can be obtained. This method consists in the production of a stable colloid that will be anchored in the support (carbon black Vulcan XC 72 R). The catalysts were investigated by the following techniques: energy dispersive analysis (EDX), X-rays powder diffraction (XRD), X-rays photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and polarization curves (Exi). The binary and ternary catalysts systems synthesized in this work were tested for the oxidation of hydrogen, H2/CO mixtures (150 ppm of CO), methanol and ethanol. The catalyst systems produced by the colloidal method presents a highly-dispersed nanocrystals structure with an average size of 2.0 to 3.1 nm. The electrocatalytic activity of the synthesized Pt-Ru-Mo catalysts for reformate and methanol oxidation was evidenced by polarization curves showing a very promising system to be optimized. PtRuDy behavior is compared to state of the art catalysts for direct ethanol fuel cells (DEFC) and should be tested in long term experiments in direct ethanol fuel cells. Only both structural and electrochemical characterization together will result in a detailed understanding of the effect of the structure on the eletrocatalytic activity of catalysts in real fuel cell systems. This work is part of a systematic research of the fuel cell group of IPEN/CNEN-SP and further investigations in the performance of these catalysts will be done. The PtRuMo system could be used for technical applications.Resumo IPEN-doc 09465 Pt-rare earth electrocatalysts for proton exchange membrane fuel cell2003 - FRANCO, E.G.; SANTORO, T.A.B.; BRANDAO, S.R.; OLIVEIRA NETO, A.; SPINACE, E.V.; ARICO, E.M.; LINARDI, M.Resumo IPEN-doc 09464 Optimization studies on PEM Fuel Cell using response surface methodology2003 - SANTORO, T.A.B.; SALIBA SILVA, A.M.; FRANCO, E.G.; BRANDAO, S.R.; BUENO, S.A.A.; LINARDI, M.Resumo IPEN-doc 09466 A compative study on PtRu/C electrocatalysts producing methods for methanol electro-oxidation in PEM fuel cell2003 - OLIVEIRA NETO, A.; SPINACE, E.V.; FRANCO, E.G.; LINARDI, M.Artigo IPEN-doc 13954 Nitriding layes structure with different surface treatment2007 - FRANCO, EGBERTO G.; AGUIAR, AMANDA A.; LIMA, NELSON B. deArtigo IPEN-doc 12472 Characterization of proton exhange membrane fuel cell catalysts2007 - FRANCO, E.G.Artigo IPEN-doc 10919 Avancos tecnologicos de celulas a combustivel com emprego de etanol2004 - FRANCO, E.G.; LINARDI, M.; COLOSIO, M.A.Artigo IPEN-doc 14391 Potencial das diferentes aplicacoes da tecnologia de celulas a combustivel2007 - PARIS, ALEXANDRE G.; VARGAS, REINALDO A.; CHIBA, RUBENS; FRANCO, EGBERTO G.; SEO, EMILIA S.M.Artigo IPEN-doc 09467 Synthesis and characterization of PtRu/C catalysts by colloidal and deposition methods for fuel cell applications2003 - FRANCO, E.G.; OLIVEIRA NETO, A.; SPINACE, E.V.; LINARDI, M.; MARTZ, N.; MAZUREK, M.; FUESS, H.The Aim Of This Work Is To Compare The Catalysts Produced By The Bonnemann Method (Colloidal) And The Catalysts Produced By The Deposition Method. For Proton Exchange Membrane Fuel Cells Applications Both Methods Lead To A Good Electrochemical Behavior Of The Catalysts For The Oxidation Of Methanol. The Catalyst Structure Was Investigated By Transmission Electron Microscopy (TEM). Energy Dispersive Analyses (EDS) Were Used To Evaluate The Semi-Quantitative Composition Of The Catalysts And Electrochemical Behavior Was Analyzed By Cyclic Voltammetry (CV). Key words: Fuel Cell, Catalyst, Methanol, Electrocatalyst, Nanocrystal.
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