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Growth and auto-oxidation of Pd on single-layer AgOx/Ag(111)

Journal Article · · Physical Chemistry Chemical Physics. PCCP (Print)
DOI:https://doi.org/10.1039/c9cp06973a· OSTI ID:1767696
 [1];  [2];  [2];  [2];  [2];  [3];  [2]
  1. Univ. of Florida, Gainesville, FL (United States); OSTI
  2. Harvard Univ., Cambridge, MA (United States)
  3. Univ. of Florida, Gainesville, FL (United States)
+ Show Author Affiliations

Here, we investigated the growth and auto-oxidation of Pd deposited onto a AgOx single-layer on Ag(111) using scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). Palladium initially grows as well-dispersed, single-layer clusters that adopt the same triangular shape and orientation of Agn units in the underlying AgOx layer. Bi-layer clusters preferentially form upon increasing the Pd coverage to ~0.30 ML (monolayer) and continue to develop until aggregating and forming a nearly conformal Pd bi-layer at a coverage near 2 ML. Analysis of the STM images provides quantitative evidence of a transition from single to bi-layer Pd growth on the AgOx layer, and a continuation of bi-layer growth with increasing Pd coverage from ~0.3 to 2 ML. XPS further demonstrates that the AgOx layer efficiently transfers oxygen to Pd at 300 K, and that the fraction of Pd that oxidizes is approximately equal to the local oxygen coverage in the AgOx layer for Pd coverages up to at least ~0.7 ML. Our results show that oxygen in the initial AgOx layer mediates the growth and structural properties of Pd on the AgOx/Ag(111) surface, enabling the preparation of model PdAg surfaces with uniformly distributed single or bi-layer Pd clusters. Facile auto-oxidation of Pd by AgOx further suggests that oxygen transfer from Ag to Pd could play a role in promoting oxidation chemistry of adsorbed molecules on PdAg surfaces.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Integrated Mesoscale Architectures for Sustainable Catalysis (IMASC); Harvard Univ., Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012573
OSTI ID:
1767696
Alternate ID(s):
OSTI ID: 1602887
OSTI ID: 1846157
Journal Information:
Physical Chemistry Chemical Physics. PCCP (Print), Journal Name: Physical Chemistry Chemical Physics. PCCP (Print) Journal Issue: 11 Vol. 22; ISSN 1463-9076
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

References (28)

Pt–Pd bimetallic catalysts for methane emissions abatement journal May 2007
The oxidation of methanol on a silver (110) catalyst journal September 1978
Atomic and molecular oxygen adsorption on Ag(111) journal July 1985
Photoelectron spectroscopy of the Ag/Pd(110) system journal March 1992
The formation of diethyl ether via the reaction of iodoethane with atomic oxygen on the Ag(110) surface journal January 1999
Superior catalytic behaviour of Pt-doped Pd catalysts in the complete oxidation of methane at low temperature journal October 2006
Partial oxidation of higher olefins on Ag(111): Conversion of styrene to styrene oxide, benzene, and benzoic acid journal December 2006
Adsorption and abstraction of oxygen atoms on Pd(111): Characterization of the precursor to PdO formation journal April 2008
STM study of high-coverage structures of atomic oxygen on Pt(111): p(2×1) and Pt oxide chain structures journal October 2008
Formation, stability and CO adsorption properties of PdAg/Pd(111) surface alloys journal April 2009
Mechanism of PdO thin film formation during the oxidation of Pd(111) journal September 2009
Surface composition of clean and oxidized Pd75Ag25(100) from photoelectron spectroscopy and density functional theory calculations journal December 2012
Formation of surface oxides and Ag2O thin films with atomic oxygen on Ag(111) journal November 2015
Dynamics of Surface Alloys: Rearrangement of Pd/Ag(111) Induced by CO and O 2 journal October 2018
Thermally Selective Formation of Subsurface Oxygen in Ag(111) and Consequent Surface Structure journal June 2016
Surface Characterization Study of the Thermal Decomposition of Ag2O journal October 1994
Surface Chemistry of Late Transition Metal Oxides journal December 2012
Surface Characterization Study of the Thermal Decomposition of AgO journal August 1994
Selectivity Limitations in the Heterogeneous Epoxidation of Olefins:  Branching Reactions of the Oxametallacycle Intermediate in the Partial Oxidation of Styrene journal February 2006
In Situ Spectroscopic Study of the Oxidation and Reduction of Pd(111) journal December 2005
High-Coverage Oxygen-Induced Surface Structures on Ag(111) journal July 2014
CO Oxidation on PdO(101) during Temperature-Programmed Reaction Spectroscopy: Role of Oxygen Vacancies journal November 2014
Mechanism of Diethyl Ether Formation on Ag(110) and Its Dependence on Coadsorbed Oxygen Species journal February 1999
Structure and local reactivity of PdAg/Pd(111) surface alloys journal January 2013
The interaction of CO with PdAg/Pd(111) surface alloys—A case study of ensemble effects on a bimetallic surface journal January 2011
Formation, atomic distribution and mixing energy in two-dimensional PdxAg1−x surface alloys on Pd(111) journal January 2012
Many-electron singularity in X-ray photoemission and X-ray line spectra from metals journal February 1970
High-Resolution X-Ray Photoemission Spectrum of the Valence Bands of Gold journal June 1972

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