MAURO C. SANTOS
26 resultados
Resultados de Busca
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Resumo IPEN-doc 22138 Oxidação da amônia em células e combustível de baixa temperatura utilizando-se PtRh/C como eletrocatalisadores2015 - NETO, A.O.; ASSUMPCAO, M.H.M.T.; PIASENTIN, R.M.; HAMMER, P.; SPINACE, E.V.; SANTOS, M.C.; SILVA, J.C.M.Resumo IPEN-doc 21797 Sintese e caracterização de eletrocatalisadores PdSn/C, PdIr/C e PdSnIr/C para oxidação eletroquímica de etanol em meio alcalino2015 - SILVA, A.A.; PARREIRA, L.S.; SILVA, S.G. da; NETO, A.O.; SANTOS, M.C.Resumo IPEN-doc 21272 Nanostruturas: Aplicações em energia e meio ambiente2015 - PARREIRA, L.S.; ANTONIN, V.S.; GEIGER, S.; GARCIA-SEGURA, S.; CAMARGO, P.; HAMMER, P.; PEREIRA, E.C.; CALEGARO, M.; LANZA, M.R.V.; NETO, A.O.; MAYHOFER, K.J.J.; BRILLAS, E.; SANTOS, M.C.Artigo IPEN-doc 21227 Binary and ternary palladium based electrocatalysts for alkaline direct glycerol fuel cell2015 - GERALDES, ADRIANA N.; SILVA, DIONISIO F. da; ANDRADE e SILVA, LEONARDO G. de; SPINACE, ESTEVAM V.; OLIVEIRA NETO, ALMIR; SANTOS, MAURO C. dosPd/C, PdAu/C 50:50, PdSn/C 50:50, PdAuSn/C 50:40:10 and PdAuSn/C 50:10:40 electrocatalysts are prepared using an electron beam irradiation reduction method and tested for glycerol electro-oxidation in alkaline medium. X-Ray diffraction (XRD), Energy dispersive X-ray analysis (EDX), Transmission electron Microscopy (TEM) and Cyclic Voltammetry (CV) are used to characterize the resulting materials. The activity for glycerol electro-oxidation is tested in alkaline medium at room temperature using Cyclic Voltammetry and Chronoamperometry (CA) and in a single alkaline direct glycerol fuel cell (ADGFC) at temperature range of 60e90 C. EDX analysis demonstrate that Pd:Au:Sn atomic ratios are very similar to the nominal ones. X-ray diffractograms of PdAuSn/C electrocatalysts evidence the presence of Pd (fcc), Au (fcc) and SnO2 phases. TEM analysis demonstrates a good dispersion of the nanoparticles on the carbon support with some agglomerates. Cyclic Voltammetry experiments suggest that PdAuSn/C electrocatalysts demonstrate better results. In single fuel cell tests, at 85 C, using 2.0 mol L 1 glycerol in 2.0 mol L 1 KOH solutions, the electrocatalyst PdAuSn/C 50:40:10 demonstrate highest power density (51 mW cm 2 ) and the 120 h durability tests demonstrate a 210 mV h 1 degradation rate.Artigo IPEN-doc 21067 Ethanol electro-oxidation in alkaline medium using Pd/MWCNT and PdAuSn/MWCNT electrocatalysts prepared by electron beam irradiation2015 - GERALDES, ADRIANA N.; SILVA, DIONISIO F. da; ANDRADE e SILVA, LEONARDO G. de; SPINACE, ESTEVAM V.; OLIVEIRA NETO, ALMIR; SANTOS, MAURO C. dosArtigo IPEN-doc 20873 Oxidation of ammonia using PtRh/C electrocatalysts: fuel cell and electrochemical evaluation2015 - ASSUMPCAO, MONICA H.M.T.; PIASENTIN, RICARDO M.; HAMMER, PETER; SOUZA, RODRIGO F.B. de; BUZZO, GUILHERME S.; SANTOS, MAURO C.; SPINACE, ESTEVAM V.; OLIVEIRA NETO, ALMIR; SILVA, JULIO C.M. daThis study reports on the use of PtRh/C electrocatalysts prepared by the borohydride reduction method with different Pt:Rh atomic ratios: (90:10, 70:30 and 50:50) which was investigated toward the ammonia electro-oxidation considering electrochemical and also direct ammonia fuel cell (DAFC) experiments. The DAFC experiments were conducted using different proportions of NH4OH and KOH as fuels. X-ray diffraction showed the formation of PtRh alloy while transmission electron micrographs showed the particles sizes between 4.1 and 4.5 nm. Among the different NH4OH and KOH concentrations the combination of 3 mol L−1 NH4OH and 3 mol L−1 KOH was the most favorable due to the higher KOH concentration, which increased the electrolyte conductivity, thus, improving the ammonia oxidation. Moreover, among the PtRh/C electrocatalysts the Pt:Rh ratio of 90:10 showed to be the best suited one since it showed a power density almost 60% higher than Pt. X-ray photoelectron spectroscopy results revealed for this catalyst that the nanoparticles contain a high proportion of metallic Pt and Rh phases, supporting the alloy formation between Pt and Rh. The improved fuel cell efficiency can be related to the combination of different effects: the alloy formation between Pt and Rh (electronic effect), suppressing the adsorption strength of poisonous intermediates, and a synergic effect between Pt and Rh at this composition.Artigo IPEN-doc 20476 Pd-based electrocatalysts prepared by borohydride reduction method for methanol and ethanol electro-oxidation in alkaline medium2014 - BRANDALISE, M.; TUSI, M.M.; SANTOS, M.C.; SPINACE, E.V.; OLIVEIRA NETO, ALMIRResumo IPEN-doc 20358 Estudo de eletrocatalisadores Pd/C e PdBi/C com diferentes razões atômicas para uso em uma célula a combustível alcalina alimentada diretamente por etanol2014 - SA, OSVALDO A. de; GERALDES, ADRIANA N.; NETO, A.O.; SANTOS, MAURO C.Resumo IPEN-doc 20359 Desenvolvimento de materiais eletrocatalíticos para uso em uma célula a combustível alcalina alimentada diretamente por glicerol2014 - GERALDES, ADRIANA N.; SILVA, DIONISIO F.; OLIVEIRA NETO, ALMIR; SPINACE, ESTEVAM V.; SANTOS, MAURO C.Resumo IPEN-doc 18202 Preparation of Pb-based electrocatalysts by borohydride reduction method to application in ethylene glycol electrooxidation in alkaline medium2012 - BRANDALISE, MICHELE; TUSI, MARCELO M.; SPINACE, ESTEVAM V.; SANTOS, MAURO C. dos; OLIVEIRA NETO, ALMIR
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