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Title: Atomic and molecular adsorption on Au(111)

Journal Article · · Surface Science
 [1];  [2];  [1];  [2]
  1. Univ. of Puerto Rico, Mayaguez (Puerto Rico)
  2. Univ. of Wisconsin, Madison, WI (United States)

Periodic self-consistent density functional theory (DFT-GGA) calculations were used to study the adsorption of several atomic species, molecular species and molecular fragments on the Au(111) surface with a coverage of 1/4 monolayer (ML). Binding geometries, binding energies, and diffusion barriers were calculated for 27 species. Furthermore, we calculated the surface deformation energy associated with the binding events. The binding strength for all the analyzed species can be ordered as follows: NH3 < NO < CO < CH3 < HCO < NH2 < COOH < OH < HCOO < CNH2 < H < N < NH < NOH < COH < Cl,< HCO3 < CH2 < CN b HNO < O < F < S < C < CH. Although the atomic species preferred to bind at the three-fold fcc site, no tendency was observed in site preference for the molecular species and fragments. The intramolecular and adsorbate-surface vibrational frequencies were calculated for all the adsorbates on their most energetically stable adsorption site. Most of the theoretical binding energies and frequencies agreed with experimental values reported in the literature. In general, the values obtained with the PW91 functional are more accurate than RPBE in reproducing these experimental binding energies. The energies of the adsorbed species were used to calculate the thermochemical potential energy surfaces for decomposition of CO, NO, N2, NH3 and CH4, oxidation of CO, and hydrogenation of CO, CO2 and NO, giving insight into the thermochemistry of these reactions on gold nanoparticles. These potential energy surfaces demonstrated that: the decomposition of species is not energetically favorable on Au(111); the desorption of NH3, NO and CO are more favorable than their decomposition; the oxidation of CO and hydrogenation of CO and NO on Au(111) to form HCO and HNO, respectively, are also thermodynamically favorable.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1227065
Journal Information:
Surface Science, Vol. 627, Issue C; ISSN 0039-6028
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

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Enhanced charge transport via d(δ)–p(π) conjugation in Mo 2 -integrated single-molecule junctions journal January 2020
Crystallographic orientation dependence of work function: carbon adsorption on Au surfaces journal February 2019
Subsurface Carbon: A General Feature of Noble Metals journal January 2019
Electronic effects due to organic linker-metal surface interactions: implications on screening of MOF-encapsulated catalysts journal January 2020
CO 2 electrochemical reduction at thiolate-modified bulk Au electrodes journal January 2019
Nonadiabatic scattering of NO off Au 3 clusters: A simple and robust diabatic state manifold generation method for multiconfigurational wavefunctions: Nonadiabatic Scattering of NO off Au 3 Clusters: A Simple and Robust Diabatic State Manifold Generation Method for Multiconfigurational Wavefunctions journal December 2018
Crystallographic orientation dependence of work function: carbon adsorption on Au surfaces text January 2019
Crystallographic orientation dependence of work function: carbon adsorption on Au surfaces text January 2019
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