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Title: Growth, sintering, and chemical states of Co supported on reducible CeO2(111) thin films: The effects of the metal coverage and the nature of the support

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/5.0036952· OSTI ID:1777437
ORCiD logo [1];  [1];  [1];  [1];  [2]
  1. Univ. of Wyoming, Laramie, WY (United States). Dept. of Chemistry
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Div.

The growth, sintering, and interaction of cobalt with ceria were studied under ultrahigh vacuum conditions by vapor-deposition of Co onto well-defined CeOx(111) (1.5 < x < 2) thin films grown on Ru(0001). Charge transfer from Co to ceria occurs upon deposition of Co on CeO1.96 and partially reduced CeO1.83 at 300 K. X-ray photoelectron spectroscopy studies show that Co is oxidized to Co2+ species at the cost of the reduction of Ce4+ to Ce3+, at a lesser extent on reduced ceria. Co2+ is the predominant species on CeO1.96 at low Co coverages (e.g., ≤0.20 ML). The ratio of metallic Co/Co2+ increases with the increase in the Co coverage. However, both metallic Co and Co2+ species are present on CeO1.83 even at low Co coverages with metallic Co as the major species. Scanning tunneling microscopy results demonstrate that Co tends to wet the CeO1.96 surface at very low Co coverages at room temperature forming one-atomic layer high structures of Co–O–Ce. The increase in the Co coverage can cause the particle growth into three-dimensional structures. The formation of slightly flatter Co particles was observed on reduced CeO1.83. In comparison with other transition metals including Ni, Rh, Pt, and Au, our studies demonstrate that Co on ceria exhibits a smaller particle size and higher thermal stability, likely arising from strong metal–support interactions. The formed particles upon Co deposition at 300 K are present on the ceria surface after heating to 1000 K. The Co–ceria interface can be tuned by varying the Co metal coverage, the annealing temperature, and the nature of the ceria surface.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
SC0012704; CHE1151846
OSTI ID:
1777437
Alternate ID(s):
OSTI ID: 1763767
Report Number(s):
BNL-221267-2021-JAAM; TRN: US2209803
Journal Information:
Journal of Chemical Physics, Vol. 154, Issue 4; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (60)

Chemical Potential of Metal Atoms in Supported Nanoparticles: Dependence upon Particle Size and Support journal November 2017
Atomically Dispersed Pd, Ni, and Pt Species in Ceria-Based Catalysts: Principal Differences in Stability and Reactivity journal April 2016
Fischer–Tropsch synthesis: Effect of ammonia on supported cobalt catalysts journal May 2016
Surface State and Catalytic Performance of Ceria-Supported Cobalt Catalysts in the Steam Reforming of Ethanol journal February 2017
The Interaction of Cobalt with CeO 2 (111) Prepared on Cu(111) journal April 2015
Growth of Pt Nanoparticles on Reducible CeO 2 (111) Thin Films: Effect of Nanostructures and Redox Properties of Ceria journal June 2010
Redox Pathways for HCOOH Decomposition over CeO 2 Surfaces journal June 2008
Cobalt-Based Catalysts for Ethanol Steam Reforming: An Overview journal May 2016
Morphology and defect structure of the CeO2(111) films grown on Ru(0001) as studied by scanning tunneling microscopy journal November 2006
Cobalt oxide surface chemistry: The interaction of CoO(100), Co3O4(110) and Co3O4(111) with oxygen and water journal February 2008
Ethanol steam reforming over Co-based catalysts: Role of oxygen mobility journal January 2009
Oxidation states of active catalytic centers in ethanol steam reforming reaction on ceria based Rh promoted Co catalysts: An XPS study journal February 2015
Nanoscale architecture of ceria-based model catalysts: Pt–Co nanostructures on well-ordered CeO2(111) thin films journal June 2020
The electronic structure of stoichiometric and reduced CeO2 surfaces: an XPS, UPS and HREELS study journal December 1994
In Situ Elucidation of the Active State of Co–CeO x Catalysts in the Dry Reforming of Methane: The Important Role of the Reducible Oxide Support and Interactions with Cobalt journal March 2018
Understanding the Nucleation and Growth of Metals on TiO 2 : Co Compared to Au, Ni, and Pt journal March 2013
Adsorption and structure dependent desorption of CO on Co(0001) journal December 1998
The effect of support reducibility on the stability of Co/CeO2 for the oxidative steam reforming of ethanol journal April 2011
Near ambient pressure XPS investigation of the interaction of ethanol with Co/CeO2(111) journal November 2013
Creating single-atom Pt-ceria catalysts by surface step decoration journal February 2016
Resolving surface chemical states in XPS analysis of first row transition metals, oxides and hydroxides: Cr, Mn, Fe, Co and Ni journal January 2011
Interface Controlled Oxidation States in Layered Cobalt Oxide Nanoislands on Gold journal February 2015
Metal-supported ultrathin oxide film systems as designable catalysts and catalyst supports journal March 2007
Adsorption and thermal stability of Mn on TiO2(110): 2p X-ray absorption spectroscopy and soft X-ray photoemission journal December 1995
Dry Reforming of Methane on a Highly-Active Ni-CeO 2 Catalyst: Effects of Metal-Support Interactions on C−H Bond Breaking journal May 2016
A study of Ru(0001) and Rh(111) surfaces using LEED and Auger electron spectroscopy journal June 1970
Support effects in cobalt-based ethanol steam reforming catalysts: Reaction of ethanol on Co/CeO2/YSZ(100) model catalysts journal July 2012
The surface chemistry of cerium oxide journal March 2015
Effect of nature of ceria supports on the growth and sintering behavior of Au nanoparticles journal February 2015
An XPS study of the growth and electronic structure of vanadia films supported on CeO2(111) journal February 2002
Trends in Adhesion Energies of Metal Nanoparticles on Oxide Surfaces: Understanding Support Effects in Catalysis and Nanotechnology journal January 2017
Effects of metal loading and support for supported cobalt catalyst journal December 2012
Ultrathin metal films and particles on oxide surfaces: structural, electronic and chemisorptive properties journal January 1997
Surface Science Studies on Cobalt Fischer-Tropsch Catalysts journal December 2010
Boosting CO2 hydrogenation via size-dependent metal–support interactions in cobalt/ceria-based catalysts journal May 2020
Interactions of Ni Nanoparticles with Reducible CeO 2 (111) Thin Films journal April 2012
Gold Adsorption on CeO 2 Thin Films Grown on Ru(0001) journal October 2013
Ag Adsorption on Reduced CeO 2 (111) Thin Films journal July 2010
2D–3D structural transition in sub-nanometer Pt N clusters supported on CeO 2 (111) journal January 2017
Effect of Cobalt on Reduction Characteristics of Ceria under Ethanol Steam Reforming Conditions: AP-XPS and XANES Studies journal June 2016
Scanning tunneling microscopy studies of Mn-doped CeOx(111) interfaces journal November 2016
XPS Study of the reduction of cerium dioxide journal May 1993
Ultrathin metal film growth on TiO2(110): an overview journal July 1995
A STM study of Ni-Rh bimetallic particles on reducible CeO2(111) journal March 2019
Interaction of cobalt with ceria thin films and its influence on supported Au nanoparticles journal August 2017
Dry Reforming of Methane Over Cobalt Catalysts: A Literature Review of Catalyst Development journal September 2012
Interaction of Gold with Cerium Oxide Supports: CeO 2 (111) Thin Films vs CeO x Nanoparticles journal March 2009
Ni Nanoparticles on CeO 2 (111): Energetics, Electron Transfer, and Structure by Ni Adsorption Calorimetry, Spectroscopies, and Density Functional Theory journal April 2020
Growth and Characterization of Rh and Pd Nanoparticles on Oxidized and Reduced CeO x (111) Thin Films by Scanning Tunneling Microscopy journal May 2008
Effect of ammonia on cobalt Fischer–Tropsch synthesis catalysts: a surface science approach journal January 2019
Epitaxial growth of CeO 2 (111) film on Ru(0001): Scanning tunneling microscopy (STM) and x-ray photoemission spectroscopy (XPS) study journal January 2014
In Situ Investigation of Methane Dry Reforming on Metal/Ceria(111) Surfaces: Metal-Support Interactions and C−H Bond Activation at Low Temperature journal September 2017
Effect of Ceria Support on the Structure of Ni Nanoparticles journal April 2010
Ti/CeOx(111) interfaces studied by XPS and STM journal April 2012
Stability and Temperature-Induced Agglomeration of Rh Nanoparticles Supported by CeO 2 journal March 2016
Adsorption and Adhesion of Au on Reduced CeO 2 (111) Surfaces at 300 and 100 K journal May 2016
Metallic phases of cobalt-based catalysts in ethanol steam reforming: The effect of cerium oxide journal February 2009
Nature of Ag Islands and Nanoparticles on the CeO 2 (111) Surface journal December 2011
Structural study of ultrathin metal films on TiO2 using LEED, ARXPS and MEED journal July 1993
Ceria Maintains Smaller Metal Catalyst Particles by Strong Metal-Support Bonding journal August 2010