AuPd/C core–shell and alloy nanoparticles with enhanced catalytic activity toward the electro-oxidation of ethanol in alkaline media

[Display omitted] •A facile synthetic route for Au@Pd/C core–shell nanoparticle preparation is proposed.•Core–shell and alloy catalysts were evaluated toward ethanol oxidation.•Catalytic activity toward ethanol oxidation depends on structure and composition.•Au@Pd/C exhibited the highest catalytic a...

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Bibliographic Details
Published in:	Applied catalysis. B, Environmental Vol. 251; pp. 313 - 325
Main Authors:	Silva, Lays S.R., Almeida, Caio V.S., Meneses, Cristiano T., Batista, Elizete A., Santos, Sydney F., Eguiluz, Katlin I.B., Salazar-Banda, Giancarlo R.
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 15-08-2019 Elsevier BV
Subjects:	Acetic acid Carbon dioxide Catalysis Catalysts Catalytic activity Chemical reduction Core-shell structure Core–shell nanostructures Electrocatalysts Ethanol Ethanol electro-oxidation Fourier transforms Fuel cells Gold Infrared spectroscopy Mass spectroscopy Morphology Nanoalloys Nanoparticles Organic chemistry Oxidation Palladium PdAu-based electrocatalysts Scanning electron microscopy Scanning-transmission electron microscopy Selectivity Spectroscopy Spectrum analysis Transmission electron microscopy X ray powder diffraction PdAu-based electrocatalysts Ethanol electro-oxidation Scanning-transmission electron microscopy Fuel cells Core–shell nanostructures
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Summary:	[Display omitted] •A facile synthetic route for Au@Pd/C core–shell nanoparticle preparation is proposed.•Core–shell and alloy catalysts were evaluated toward ethanol oxidation.•Catalytic activity toward ethanol oxidation depends on structure and composition.•Au@Pd/C exhibited the highest catalytic activity for ethanol electro-oxidation.•The catalytic activity for Au@Pd/C was two times higher, at 1.1 V, compared to Pd/C. Carbon-supported Pd, Au@Pd core–shell and Au1–xPdx-alloyed nanoparticles were prepared by a chemical reduction method and characterized by different experimental techniques, including X-ray powder diffraction, transmission electron microscopy, scanning-transmission electron microscopy using bright-field and high-angle annular dark field detectors and X-ray energy dispersive spectroscopy. The catalytic mass activity toward ethanol oxidation was assessed by cyclic voltammetry and chronoamperometry at room temperature. The measurements showed that the addition of Au enhances remarkably the electrocatalytic activity of the material, due to the bifunctional effect of Au1–xPdx/C alloys, and the synergetic effect on Au@Pd/C, resulting in a dissolution resistance of core–shell catalysts at potentials of 1.5 V versus reversible hydrogen electrode. In situ Fourier transform infrared spectroscopy measurements showed that the mechanism for ethanol oxidation depends on the electrocatalyst structure and morphology. Acetate was identified as the main product of ethanol electro-oxidation on the studied electrocatalysts. However, the presence of a core–shell structure on Au@Pd/C resulted in enhanced ethanol oxidation selectivity toward CO2. The improvement of activity is attributed to the interaction between Pd shell and Au core.
ISSN:	0926-3373 1873-3883
DOI:	10.1016/j.apcatb.2019.03.067