EGBERTO GOMES FRANCO
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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.Artigo IPEN-doc 09274 Eletro-oxidacao do metanol sobre eletrocatalisadores Pt-Ru/C preparados pelo metodo de deposicao espontanea2002 - OLIVEIRA NETO, A.; FRANCO, E.G.; SPINACE, E.V.; LINARDI, M.Artigo IPEN-doc 11164 Synthesis and characterization of Pt/Ru/C catalysts obtained by colloidal and deposition methods for fuel cell applications2005 - FRANCO, E.G.; OLIVEIRA NETO, A.; SPINACE, E.V.; LINARDI, M.; MARTZ, N.; MAZUREK, M.; FUESS, H.The purpose of this investigation was to compare catalysts produced by the Bönnemann - colloidal method (PtRu (B1) and PtRu (B2)), and those produced by the spontaneous deposition method (PtRu (SD)). The catalysts produced by both methods had good electrochemical behavior for methanol oxidation for proton exchange membrane fuel cell applications. The structure of the catalyst was examined by transmission electron microscopy (TEM). Energy dispersive spectroscopic analysis (EDS) was used to determine the semi-quantitative composition of the catalysts, and the electrochemical behavior was determined by cyclic voltammetry (CV). The diffractograms of the binary catalysts revealed platinum and ruthenium as the only crystalline phases, as per ICDD data base. The PtRu (B1) catalyst, treated in a reducing atmosphere, has the same structure as PtRu (B2), treated in an oxidising/reducing atmosphere, except that the crystallite size was around 1.7 nm for PtRu (B1) instead of 9.9 nm for PtRu (B2). The catalysts PtRu (B2) and PtRu (SD) showed similar cyclic voltammetric behavior, which was better than that of PtRu (B1). Both methods are suitable for the production of electrocatalysts for fuel cell applications. The colloidal method is more expensive than the deposition method, but the former permits the production of ternary and quaternary catalyst systems with enhanced CO tolerance.