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Title: Formation, Migration, and Reactivity of Au CO Complexes on Gold Surfaces

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.5b09052· OSTI ID:1238006
 [1];  [2];  [2];  [2];  [1];  [1];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Virginia, Charlottesville, VA (United States)

Here, we report experimental as well as theoretical evidence that suggests Au CO complex formation upon the exposure of CO to active sites (step edges and threading dislocations) on a Au(111) surface. Room-temperature scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy, transmission infrared spectroscopy, and density functional theory calculations point to Au CO complex formation and migration. Room-temperature STM of the Au(111) surface at CO pressures in the range from 10^ 8 to 10^ 4 Torr (dosage up to 10^6 langmuir) indicates Au atom extraction from dislocation sites of the herringbone reconstruction, mobile Au CO complex formation and diffusion, and Au adatom cluster formation on both elbows and step edges on the Au surface. The formation and mobility of the Au CO complex result from the reduced Au Au bonding at elbows and step edges leading to stronger Au CO bonding and to the formation of a more positively charged CO (CO +) on Au. These studies indicate that the mobile Au CO complex is involved in the Au nanoparticle formation and reactivity, and that the positive charge on CO increases due to the stronger adsorption of CO at Au sites with lower coordination numbers.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1238006
Journal Information:
Journal of the American Chemical Society, Vol. 138, Issue 5; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 59 works
Citation information provided by
Web of Science

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Cited By (10)

Real‐Space Observation of Atomic Site‐Specific Electronic Properties of a Pt Nanoisland/Au(111) Bimetallic Surface by Tip‐Enhanced Raman Spectroscopy journal September 2018
Self-activated surface dynamics in gold catalysts under reaction environments journal May 2018
CO oxidation on Ru–Pt bimetallic nanoclusters supported on TiO 2 (101): The effect of charge polarization journal March 2018
Surface chemistry of group IB metals and related oxides journal January 2017
Static Regulation and Dynamic Evolution of Single‐Atom Catalysts in Thermal Catalytic Reactions journal November 2018
Crystal-defect-induced facet-dependent electrocatalytic activity of 3D gold nanoflowers for the selective nanomolar detection of ascorbic acid journal January 2018
Real‐Space Observation of Atomic Site‐Specific Electronic Properties of a Pt Nanoisland/Au(111) Bimetallic Surface by Tip‐Enhanced Raman Spectroscopy journal October 2018
Improved CO2 reduction activity towards C2+ alcohols on a tandem gold on copper electrocatalyst journal October 2018
In situ formation of mononuclear complexes by reaction-induced atomic dispersion of supported noble metal nanoparticles journal November 2019
Heterogeneous single-atom catalysis journal May 2018

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