title: On the enhanced electrocatalytic activity of Pd overlayers on carbon-supported gold particles in hydrogen electrooxidation.
abstract: Palladium-gold particles with varied composition were prepared by Pd electrochemical deposition on Au nanoparticles immobilized on model carbon support. Pd-Au/C catalysts were characterized ex situ by transmission electron microscopy, energy dispersive X-ray analysis and X-ray photoelectron spectroscopy, and in situ, by underpotential deposition of hydrogen and copper adatoms, and CO stripping. Hydrogen oxidation reaction on pristine and CO-poisoned Pd-Au/C particles was studied using rotating disk electrode (RDE) technique. It was found that the decrease of the effective Pd overlayer thickness below ca. two monolayers resulted in a two-fold increase of the exchange current density of the hydrogen oxidation reaction and in significant increase of CO tolerance.
authors.affiliation: Laboratory of Materials, Surfaces and Catalytic Processes, UMR 7515 of CNRS-ULP-ECPM, University Louis Pasteur, 25 Rue Becquerel, 67087, Strasbourg, France.
authors.forename: Pavel S
authors.initials: PS
authors.lastname: Ruvinsky
authors.forename: Sergey N
authors.initials: SN
authors.lastname: Pronkin
authors.forename: Vladimir I
authors.initials: VI
authors.lastname: Zaikovskii
authors.forename: Pierre
authors.initials: P
authors.lastname: Bernhardt
authors.forename: Elena R
authors.initials: ER
authors.lastname: Savinova
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry; D002248:Carbon Monoxide / Q000737:chemistry; D002384:Catalysis; D003300:Copper / Q000737:chemistry; D004563:Electrochemistry; D006046:Gold / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010165:Palladium / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D013499:Surface Properties
chemical_list: D010165:Palladium; D002244:Carbon; D006046:Gold; D003300:Copper; D002248:Carbon Monoxide; D006859:Hydrogen