Electrochemical Oxidation of Small Organic Molecules on Au Nanoparticles with Preferential Surface Orientation

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Title: Electrochemical Oxidation of Small Organic Molecules on Au Nanoparticles with Preferential Surface Orientation
Authors: Monzó, Javier | Malewski, Yvonne | Vidal-Iglesias, Francisco J. | Solla-Gullón, José | Rodriguez, Paramaconi
Research Group/s: Electroquímica de Superficies | Electroquímica Aplicada y Electrocatálisis
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Alcohols | Gold | Nanostructures | Oxidation | Preferential surface orientation
Knowledge Area: Química Física
Issue Date: 15-Jul-2015
Publisher: Wiley-VCH Verlag GmbH & Co. KGaA
Citation: ChemElectroChem. 2015, 2(7): 958-962. doi:10.1002/celc.201500084
Abstract: The surface orientation effect on the oxidation of small organic molecules such as methanol, formaldehyde, ethanol, and glycerol has been studied on Au nanoparticles in alkaline medium. Two sets of Au nanoparticles enriched in (100) and (111) facets were synthetized by using colloidal methods in presence of cetyltrimethylammonium bromide. The nanoparticles were physically characterized by using TEM and XRD and electrochemically characterized by using Pb underpotential deposition as a surface-structure probe. It is reported that, although methanol oxidation was similar in both types of nanoparticles, the oxidation of formaldehyde presented a clear surface orientation effect. For this reaction, nanoparticles with (111) preferential orientation presented higher current densities at low potentials, whereas Au(100) nanoparticles exhibited higher activity at potentials more positive than 1.0 V versus RHE. On the other hand, for glycerol and ethanol oxidations, the onset of the reaction was similar in both types of particles, although Au(111) nanoparticles showed higher current densities than the Au(100) ones.
Sponsor: P.R. acknowledges financial support from the Netherlands Organization for Scientific Research (NWO) through a VENI grant and the University of Birmingham through a Birmingham Fellowship.
URI: http://hdl.handle.net/10045/53171
ISSN: 2196-0216
DOI: 10.1002/celc.201500084
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Peer Review: si
Publisher version: http://dx.doi.org/10.1002/celc.201500084
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INV - EQSUP - Artículos de Revistas

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