Publicação: Effects of heat treatments on the electrocatalytic activity of Pt-Ru/C for methanol oxidation
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The Pt-Ru/C materials of this study were prepared by a microemulsion method with fixed water to surfactant molar ratio and heat treated at low temperatures, to avoid changes in the average particle size, in different atmospheres. All samples were characterized by X-ray diffraction (XRD) and the mean crystallite size was estimated by using Scherrer's equation. Catalysts morphology was characterized by transmission electron microscopy (TEM). Average composition was obtained by energydispersive X-ray analysis (EDX). The general electrochemical behavior was evaluated by cyclic voltammetry in 0.5 M sulfuric acid and the electrocatalytic activity towards the oxidation of methanol was studied in 0.5 M methanol acid solutions by potential sweeps and chronoamperometry. Oxidation of adsorbed CO was used to estimate the electrochemical active area and to infer the surface properties. ©The Electrochemical Society.
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Acid solutions, Active area, Adsorbed CO, Average composition, Average particle size, Effects of heat treatment, Electrocatalytic activity, Electrochemical behaviors, Fixed water, Low temperatures, Methanol Oxidation, Microemulsion method, Molar ratio, Oxidation of methanol, Potential sweep, Scherrer's equation, TEM, Acids, Carbon monoxide, Chemical analysis, Chronoamperometry, Crystallite size, Electrocatalysis, Electrochemical properties, Electrochemical sensors, Energy conversion, Heat treatment, Methanol, Microemulsions, Nanostructured materials, Oxidation, Platinum, Sulfuric acid, Surface active agents, Surface properties, Transmission electron microscopy, X ray diffraction, Cyclic voltammetry
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ECS Transactions, v. 11, n. 31, p. 35-41, 2008.
