Probing electronic and atomic ensembles effects on PtAu3 nanoparticles with CO adsorption and electrooxidation

Gema Cabello*, Rogerio A. Davoglio, José F. Marco, Angel Cuesta

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

We have studied the adsorption and electrooxidation of CO on PtAu3 nanoalloys, aiming at providing further insight about the correlation between atomic structure and catalytic properties. The multiplicity of adsorption sites with different geometry and composition on the nanoparticles surface is demonstrated by a combination of electrochemical and infrared experiments. Specifically, the occurrence of low- and high-coordinated Pt atoms was confirmed by the splitting of the linearly-bonded CO band after removing CO from the electrolyte. Despite the low activity for the electrooxidation of COad of our PtAu3 nanoparticles, the combination of small Pt(111) terraces and small Pt atomic ensembles on their surfaces revealed by our experiments is connected with the negligible CO poisoning and the resulting high catalytic activity of our PtAu3 NPs for the formic acid oxidation reaction [Electrochim. Acta 2017, 224, 56–63].
Original languageEnglish
Article number114233
JournalJournal of Electroanalytical Chemistry
Volume870
Early online date19 May 2020
DOIs
Publication statusE-pub ahead of print - 19 May 2020

Keywords

  • CO electrooxidation
  • PtAu nanoparticles
  • Electronic effects
  • Atomic ensembles
  • ATR-SEIRAS
  • METHANOL
  • STRIPPING VOLTAMMOGRAMS
  • COVERAGE
  • CHARGE DISPLACEMENT
  • POTENTIAL DEPENDENCE
  • CARBON-MONOXIDE
  • SITU INFRARED-SPECTROSCOPY
  • PT(111) ELECTRODES
  • ELECTROCATALYSIS
  • CYCLIC VOLTAMMETRY

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