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Título del libro: Optimal Energy Growth In Variable-Density Mixing Layers At High Atwood Number
Título del capítulo: Preparation and characterization of Pt-Pd electrocatalysts for the oxygen reduction reaction in acid and alkaline medium

Autores UNAM:
AGUSTIN FERNANDEZ Y EGUIARTE;

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Autores externos:

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Idioma:
Inglés

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Año de publicación:
2014

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Palabras clave:

Alkalinity; Characterization; Cracking (chemical); Cyclic voltammetry; Direct methanol fuel cells (DMFC); Electrocatalysts; Electrodes; Electrolysis; Electrolytic reduction; Energy dispersive spectroscopy; Fuel cells; Gas fuel purification; Hydrogen; Materials; Methanol fuels; Oxygen; Palladium; Particle size; Particle size analysis; Platinum; Platinum alloys; Reduction; Rotating disks; Synthesis (chemical); X ray diffraction; Chemical reduction methods; Electrocatalytic; Electrocatalytic properties; Electrochemical characterizations; Energy dispersive spectroscopies (EDS); Oxygen reduction reaction; Pt alloy; Structure and morphology; Direct alcohol fuel cells (DAFC)

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Resumen:

In this work, we report the synthesis, structural, morphological and electrochemical characterization of novel Pt-Pd electrocatalysts. These materials are becoming candidates for their use as cathodes in DAFC (Direct Alcohol Fuel Cells). These have been usually prepared by a) chemical reduction method using H2PtCl6?6H2O and (NH4)2PdCl6 salts combine with sodium borohydride at different times and b) pyrolysis technique using of H2PtCl6?6H2O and (NH4)2PdCl6 at different temperatures, under an (H2/N2 5:95) as reducing atmosphere, during 5 h. The main objective was to evaluate the influence of experimental parameters of two synthesis techniques, the structure and morphology characteristics in their electrocatalytic properties for the Oxygen Reduction Reaction (ORR), in acid and alkaline medium. The structural, morphological and atomic composition was made by X-ray diffraction, Scanning Electron Mcroscopy (SEM) couple with energy dispersive spectroscopy (EDS). From theses analyses were estimate the particle size, the structural phases and the atomic composition of the materials. The electrochemical characterization consisted of room temperature rotating disk electrode (RDE) measurement, in 0.5 M H2SO4 or 0.1 M KOH, using cyclic and linear sweep voltammetry (CV and LSV) techniques. The kinetic parameters such as the Tafel slop and interchange current density calculated LSV polarization curves.

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Entidades citadas de la UNAM:

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Fuente:


ISBN:
9780000000002
Editorial:
TSFP-9

Tipo de producto:
Conference Paper