Strain Effects on the Oxidation of CO and HCOOH on Au–Pd Core–Shell Nanoparticles | Zendy

Verónica Celorrio | Zendy; Paola Quaino | Zendy; Elizabeth Santos | Zendy; Jonathan Flórez-Montaño | Zendy; Jo J. L. Humphrey | Zendy; O. Guillén-Villafuerte | Zendy; Daniela Plana | Zendy; M.J. Lázaro | Zendy; Elena Pastor | Zendy; David J. Fermı́n | Zendy

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Strain Effects on the Oxidation of CO and HCOOH on Au–Pd Core–Shell Nanoparticles

Author(s) -

Verónica Celorrio,

Paola Quaino,

Elizabeth Santos,

Jonathan Flórez-Montaño,

Jo J. L. Humphrey,

O. Guillén-Villafuerte,

Daniela Plana,

M.J. Lázaro,

Elena Pastor,

David J. Fermı́n

Publication year - 2017

Publication title -

acs catalysis

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 4.898

H-Index - 198

ISSN - 2155-5435

DOI - 10.1021/acscatal.6b03237

Subject(s) - fourier transform infrared spectroscopy , chemistry , density functional theory , nanoparticle , electrochemistry , spectroscopy , adsorption , photochemistry , catalysis , reaction mechanism , redox , inorganic chemistry , materials science , computational chemistry , nanotechnology , chemical engineering , electrode , organic chemistry , physics , quantum mechanics , engineering

The mechanism of CO and HCOOH electrooxidation in an acidic solution on carbon-supported Au–Pd core–shell nanoparticles was investigated by differential electrochemical mass spectrometry and in situ Fourier transform infrared (FTIR) spectroscopy. Analysis performed in nanostructures with 1.3 ± 0.1 nm (CS1) and 9.9 ± 1.1 nm (CS10) Pd shells provides compelling evidence that the mechanism of adsorbed CO (COads) oxidation is affected by structural and electronic effects introduced by the Au cores. In the case of CS10, a band associated with adsorbed OH species (OHads) is observed in the potential range of CO oxidation. This feature is not detected in the case of CS1, suggesting that the reaction follows an alternative mechanism involving COOHads species. The faradaic charge associated with COads oxidation as well as the Stark slope measured from FTIR indicates that the overall affinity and orbital coupling of CO to Pd are weaker for CS1 shells. FTIR spectroscopy also revealed the presence of HCOOads intermed...

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