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Title: CO Adsorption on Au Nanoparticles Grown on Hexagonal Boron Nitride/Rh(111)

Journal Article · · Journal of Physical Chemistry. C
 [1];  [1];  [2];  [1];  [1];  [1];  [2];  [1]
  1. Louisiana State Univ., Baton Rouge, LA (United States)
  2. Texas A & M Univ., College Station, TX (United States)

CO adsorption on size-controlled Au nanoparticles grown on an $$h$$-BN/Rh(111) nanomesh surface has been examined to probe their potential catalytic properties. A combination of high-resolution electron energy loss spectroscopy (HREELS), temperature-programmed desorption (TPD), and density functional theory (DFT) calculations demonstrate that the CO adsorption strength depends heavily on the Au deposition coverage and particle morphology. Particles resulting from low Au coverages deposited at the liquid nitrogen temperature exhibit significantly enhanced CO binding relative to bulk crystalline Au. The resulting CO TPD spectra, and the significantly red-shifted C–O stretching frequency and negative charging of the Au nanoparticles as evidenced by HREELS and DFT, all correspond to those reported for catalytically active Au nanoparticles grown on reactive metal oxides, even though the h-BN/Rh(111) surface is free of carbon, oxygen, or defects. DFT modeling further suggests that the enhanced CO adsorption occurs at highly undercoordinated Au atoms on the perimeters of the nanoparticles. As the Au coverage is increased, the CO adsorption energy and C–O stretching frequency converge toward values associated with bulk Au. Annealing to 600 K results in bulk-like CO adsorption characteristics at any Au coverage. These results suggest that the $$h$$-BN/Rh(111) surface represents a potential platform for evaluating the role of Au vs support in low-temperature CO oxidation.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Atomic-Level Catalyst Design (CALCD)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001058
OSTI ID:
1369695
Journal Information:
Journal of Physical Chemistry. C, Vol. 120, Issue 20; Related Information: CALCD partners with Louisiana State University (lead); Clemson University; University of Florida; Georgia Institute of Technology; Grambling State University; Oak Ridge National Laboratory; Ohio State University; Pennsylvania State; Texas A&M University; Vienna University of Technology, Austria; University of Utrecht, Netherlands; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Cited By (3)

Growth and stability of Pt nanoclusters from 1 to 50 atoms on h-BN/Rh(111) journal January 2019
CO 2 electrochemical reduction at thiolate-modified bulk Au electrodes journal January 2019
Tailoring the hexagonal boron nitride nanomesh on Rh(111) with gold journal January 2018