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Yi Z, Lin L, Chang Y, Luo X, Gao J, Mu R, Ning Y, Fu Q, Bao X. Dynamic transformation between bilayer islands and dinuclear clusters of Cr oxide on Au(111) through environment and interface effects. Proc Natl Acad Sci U S A 2022; 119:e2120716119. [PMID: 35605120 PMCID: PMC9295788 DOI: 10.1073/pnas.2120716119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Accepted: 04/15/2022] [Indexed: 11/18/2022] Open
Abstract
SignificanceFor oxide catalysts, it is important to elucidate and further control their atomic structures. In this work, well-defined CrO2 bilayer islands and Cr2O7 dinuclear clusters have been grown on Au(111) and unambiguously identified by scanning tunneling microscopy and theoretical calculations. Upon cycled redox treatments, the two kinds of oxide nanostructures can be reversibly transformed. It is interesting to note that both Cr oxides do not exist in bulk but need to be stabilized by the metal surface and the specific environment. Our results suggest that both redox atmosphere and interface confinement effects can be used to construct an oxide nanostructure with the specific chemical state and structure.
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Affiliation(s)
- Zhiyu Yi
- State Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Le Lin
- State Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Yuan Chang
- Key Laboratory of Material Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian 116024, China
| | - Xuda Luo
- State Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Junfeng Gao
- Key Laboratory of Material Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian 116024, China
| | - Rentao Mu
- State Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Yanxiao Ning
- State Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Qiang Fu
- State Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Xinhe Bao
- State Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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Egle T, O'Connor CR, Friend CM. Regeneration of Active Surface Alloys during Cyclic Oxidation and Reduction: Oxidation of H 2 on Pd/Ag(111). J Phys Chem Lett 2021; 12:6752-6759. [PMID: 34264673 DOI: 10.1021/acs.jpclett.1c01367] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The surface morphology and composition of a catalyst during excursions between oxidizing and reducing conditions can change substantially, especially in bimetallic alloys. Both thermodynamic and kinetic factors play a role in determining the properties of alloy surfaces where the active phase may be a metastable state. Previously, Ag oxide reduction was shown to be dramatically enhanced when Pd is on the surface; however, Pd is more stable when dissolved in Ag, raising the question as to whether a highly active Pd surface state will persist over multiple reaction cycles, a requirement for catalytic function. Experiments herein demonstrate that the enhanced chemical functionality due to the presence of Pd on the surface is retained, based on the enhanced rate of silver oxide reduction over multiple oxidation/reduction cycles for a Pd/Ag(111) model. Repeated oxidation and reduction promote PdAg alloying, and reversible structural and compositional changes are detected using X-ray photoelectron spectroscopy. This study establishes that metastable phases can persist in reactive processes on surfaces, indicating their potential in heterogeneous catalysis.
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Fester J, Sun Z, Rodríguez-Fernández J, Walton A, Lauritsen JV. Phase Transitions of Cobalt Oxide Bilayers on Au(111) and Pt(111): The Role of Edge Sites and Substrate Interactions. J Phys Chem B 2017; 122:561-571. [DOI: 10.1021/acs.jpcb.7b04944] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jakob Fester
- Interdisciplinary Nanoscience
Center (iNANO), Aarhus University, 8000 Aarhus C, Denmark
| | - Zhaozong Sun
- Interdisciplinary Nanoscience
Center (iNANO), Aarhus University, 8000 Aarhus C, Denmark
| | | | - Alex Walton
- Interdisciplinary Nanoscience
Center (iNANO), Aarhus University, 8000 Aarhus C, Denmark
| | - Jeppe V. Lauritsen
- Interdisciplinary Nanoscience
Center (iNANO), Aarhus University, 8000 Aarhus C, Denmark
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Tanaka KI, He H, Yuan Y. Catalytic oxidation of CO on metals involving an ionic process in the presence of H2O: the role of promoting materials. RSC Adv 2015. [DOI: 10.1039/c4ra08349k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A new catalytic oxidation of CO is enhanced by H2O molecule on the Pt and Au with specific promoting materials where the rate-determining reaction of HCOO(a) + OH → CO2 + H2O is promoted by repeated contribution of OH− anion via messenger molecule H2O.
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Affiliation(s)
- Ken-Ichi Tanaka
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing 100085
- China
| | - Hong He
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing 100085
- China
| | - Youzhu Yuan
- State Key Laboratory of Physical Chemistry of Solid Surfaces and National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
- China
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5
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A comparative study in structure and reactivity of “FeO x -on-Pt” and “NiO x -on-Pt” catalysts. Sci China Chem 2014. [DOI: 10.1007/s11426-014-5266-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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6
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Wei M, Fu Q, Dong A, Wang ZJ, Bao X. Coverage and Substrate Effects on the Structural Change of FeOx Nanostructures Supported on Pt. Top Catal 2014. [DOI: 10.1007/s11244-014-0248-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Le Moal S, Moors M, Essen JM, Breinlich C, Becker C, Wandelt K. Structural and compositional characterization of ultrathin titanium oxide films grown on Pt3Ti(111). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:045013. [PMID: 23288493 DOI: 10.1088/0953-8984/25/4/045013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
We have investigated the growth of ultrathin titanium oxide (TiO(x)) films on a Pt(3)Ti(111) single crystal surface as a function of oxidation temperature (300-1000 K) and oxygen exposure (up to 4500 l) by means of Auger electron spectroscopy, low-energy electron diffraction, ultraviolet photoelectron spectroscopy and high-resolution electron energy loss spectroscopy (HREELS). Both the surface composition and the surface structure of the resulting TiO(x) films exhibit a strong dependence on the preparation conditions. Loss of the chemical order and Ti segregation are observed at the Pt(3)Ti(111) surface upon oxygen exposures of more than 135 l at 1000 K. Increasing oxygen exposure enhances Ti segregation and oxide growth. At a threshold of ≈220 l (at 1000 K) a transition in the oxide structure occurs, namely from a (6 × 3√3) rectangular structure (a = 16.6 Å, b = 14.4 Å) below 220 l to a (7 × 7)R21.8° hexagonal structure (a = b = 19.3 Å) above 220 l. Two additional incommensurate rectangular metastable structures are observed for the highest oxygen exposures (above 900 l) at intermediate oxidation temperatures (800-900 K). In all cases the changes in the valence band spectra and the work function with respect to the clean Pt(3)Ti(111) surface are independent of the chosen oxidation parameters. Based on their HREELS spectra we identify the (6 × 3√3) and (7 × 7)R21.8° structures grown at 1000 K with a stoichiometric TiO phase, while the other and less stable oxide phases grown at 800-900 K exhibit more complex phonon structures that could not simply be associated with any of the stoichiometric phases TiO, Ti(2)O(3) or TiO(2). Our results are rather similar to those found by Granozzi et al for the deposition of Ti onto a Pt(111) surface in an oxygen atmosphere, except a few interesting deviations as a consequence of the different preparation conditions.
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Affiliation(s)
- Séverine Le Moal
- Institute of Physical and Theoretical Chemistry, University of Bonn, Wegelerstrasse 12, D-53115 Bonn, Germany
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Fu Q, Yao Y, Guo X, Wei M, Ning Y, Liu H, Yang F, Liu Z, Bao X. Reversible structural transformation of FeOx nanostructures on Pt under cycling redox conditions and its effect on oxidation catalysis. Phys Chem Chem Phys 2013; 15:14708-14. [DOI: 10.1039/c3cp52587b] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Surnev S, Fortunelli A, Netzer FP. Structure-property relationship and chemical aspects of oxide-metal hybrid nanostructures. Chem Rev 2012; 113:4314-72. [PMID: 23237602 DOI: 10.1021/cr300307n] [Citation(s) in RCA: 141] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Svetlozar Surnev
- Surface and Interface Physics, Institute of Physics, Karl-Franzens University, Graz A-8010 Graz, Austria
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Lovis F, Hesse M, Imbihl R. Redistribution of Supported Vanadium Oxide Catalysts by Pattern Formation. Catal Letters 2010. [DOI: 10.1007/s10562-010-0320-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Krenn G, Schoiswohl J, Surnev S, Netzer FP, Schennach R. Metal-oxide boundary effects in vanadium oxide – Rh(111) inverse model catalysts: a RAIRS, STM and TPD study. Top Catal 2007. [DOI: 10.1007/s11244-007-0333-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sedona F, Rizzi GA, Agnoli S, Llabrés i Xamena FX, Papageorgiou A, Ostermann D, Sambi M, Finetti P, Schierbaum K, Granozzi G. Ultrathin TiOx Films on Pt(111): A LEED, XPS, and STM Investigation. J Phys Chem B 2005; 109:24411-26. [PMID: 16375442 DOI: 10.1021/jp0543173] [Citation(s) in RCA: 151] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ultrathin ordered titanium oxide films on Pt(111) surface are prepared by reactive evaporation of Ti in oxygen. By varying the Ti dose and the annealing conditions (i.e., temperature and oxygen pressure), six different long-range ordered phases are obtained. They are characterized by means of low-energy electron diffraction (LEED), X-ray photoemission spectroscopy (XPS), and scanning tunneling microscopy (STM). By careful optimization of the preparative parameters, we find conditions where predominantly single phases of TiO(x), revealing distinct LEED pattern and STM images, are produced. XPS binding energy and photoelectron diffraction (XPD) data indicate that all the phases, except one (the stoichiometric rect-TiO2), are one monolayer thick and composed of a Ti-O bilayer with interfacial Ti. Atomically resolved STM images confirm that these TiO(x) phases wet the Pt surface, in contrast to rect-TiO2. This indicates their interface stabilization. At a low Ti dose (0.4 monolayer equivalents, MLE), an incommensurate kagomé-like low-density phase (k-TiO(x) phase) is observed where hexagons are sharing their vertexes. At a higher Ti dose (0.8 MLE), two denser phases are found, both characterized by a zigzag motif (z- and z'-TiO(x) phases), but with distinct rectangular unit cells. Among them, z'-TiO(x), which is obtained by annealing in ultrahigh vacuum (UHV), shows a larger unit cell. When the postannealing of the 0.8 MLE deposit is carried out at high temperatures and high oxygen partial pressures, the incommensurate nonwetting, fully oxidized rect-TiO2 is found The symmetry and lattice dimensions are almost identical with rect-VO2, observed in the system VO(x)/Pd(111). At a higher coverage (1.2 MLE), two commensurate hexagonal phases are formed, namely the w- [(square root(43) x square root(43)) R 7.6 degrees] and w'-TiO(x) phase [(7 x 7) R 21.8 degrees]. They show wagon-wheel-like structures and have slightly different lattice dimensions. Larger Ti deposits produce TiO2 nanoclusters on top of the different monolayer films, as supported both by XPS and STM data. Besides the formation of TiO(x) surfaces phases, wormlike features are found on the bare parts of the substrate by STM. We suggest that these structures, probably multilayer disordered TiO2, represent growth precursors of the ordered phases. Our results on the different nanostructures are compared with literature data on similar systems, e.g., VO(x)/Pd(111), VO(x)/Rh(111), TiO(x)/Pd(111), TiO(x)/Pt(111), and TiO(x)/Ru(0001). Similar and distinct features are observed in the TiO(x)/Pt(111) case, which may be related to the different chemical natures of the overlayer and of the substrate.
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Affiliation(s)
- Francesco Sedona
- Dipartimento di Scienze Chimiche and Unità di Ricerca INFM-CNR, Università di Padova, Via Marzolo, I-35131 Padova, Italy
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Belzunegui JP, Sanz J, Guil JM. Influence of Reduction Conditions on H2 Adsorption in High-Surface Rh/CeO2 Catalysts as Deduced by Volumetry, Calorimetry, and 1H NMR Techniques. J Phys Chem B 2005; 109:19390-6. [PMID: 16853504 DOI: 10.1021/jp052766x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
1H NMR spectra corresponding to H2 adsorption on high-surface Rh/CeO2 catalysts (S(BET) approximately 55 m2/g) are formed by two lines, attributed to hydrogen adsorbed on ceria (resonance line A) and rhodium-metal particles (upfield-shifted line B). The evolution of 1H NMR spectra as a function of temperature, time, and type of reduction (static or dynamic) allows the study of the progressive establishment of the strong metal-support interaction (SMSI) in Rh/CeO2 catalysts. As the reduction progresses, the mean adsorption heat and the amount of hydrogen adsorbed on the metal, deduced from volumetry, NMR, and calorimetry techniques, decrease considerably. As a consequence of the decrease in metal activity, the amount of hydrogen transferred to the support CeO2 is also reduced (spill-over processes). Outgassing of samples at 773 K eliminates hydrogen species retained at the metal-support surface, and oxidation treatments at 473 and 673 K eliminate the electronic effect and physical blocking of metal particles. The oxidation at 673 K recuperates the total adsorption capacity of metal particles. On the basis of these treatments, the contribution of different processes to the SMSI effect is analyzed. Electronic perturbation of rhodium particles is higher when reductions are performed in dynamic conditions; however, the importance of physical blocking of metal particles increases in static reductions. High reducibility of ceria strengthens electronic effects in Rh/CeO2 compared to those observed in Rh/TiO2 catalysts.
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Affiliation(s)
- J P Belzunegui
- Instituto de Ciencia de Materiales de Madrid, C.S.I.C., Campus Universitario de Cantoblanco, 28049 Madrid, Spain
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15
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Schoiswohl J, Surnev S, Netzer FP. Reactions on Inverse Model Catalyst Surfaces: Atomic Views by STM. Top Catal 2005. [DOI: 10.1007/s11244-005-7865-3] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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16
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Surnev S, Sock M, Kresse G, Andersen JN, Ramsey MG, Netzer FP. Unusual CO Adsorption Sites on Vanadium Oxide−Pd(111) “Inverse Model Catalyst” Surfaces. J Phys Chem B 2003. [DOI: 10.1021/jp0223408] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- S. Surnev
- Institut für Experimentalphysik, Karl-Franzens Universität Graz, A-8010 Graz, Austria, Institut für Materialphysik, Universität Wien, A-1090 Vienna, Austria, and Department of Synchrotron Radiation Research, Institute of Physics, Lund University, S-223 62 Lund, Sweden
| | - M. Sock
- Institut für Experimentalphysik, Karl-Franzens Universität Graz, A-8010 Graz, Austria, Institut für Materialphysik, Universität Wien, A-1090 Vienna, Austria, and Department of Synchrotron Radiation Research, Institute of Physics, Lund University, S-223 62 Lund, Sweden
| | - G. Kresse
- Institut für Experimentalphysik, Karl-Franzens Universität Graz, A-8010 Graz, Austria, Institut für Materialphysik, Universität Wien, A-1090 Vienna, Austria, and Department of Synchrotron Radiation Research, Institute of Physics, Lund University, S-223 62 Lund, Sweden
| | - J. N. Andersen
- Institut für Experimentalphysik, Karl-Franzens Universität Graz, A-8010 Graz, Austria, Institut für Materialphysik, Universität Wien, A-1090 Vienna, Austria, and Department of Synchrotron Radiation Research, Institute of Physics, Lund University, S-223 62 Lund, Sweden
| | - M. G. Ramsey
- Institut für Experimentalphysik, Karl-Franzens Universität Graz, A-8010 Graz, Austria, Institut für Materialphysik, Universität Wien, A-1090 Vienna, Austria, and Department of Synchrotron Radiation Research, Institute of Physics, Lund University, S-223 62 Lund, Sweden
| | - F. P. Netzer
- Institut für Experimentalphysik, Karl-Franzens Universität Graz, A-8010 Graz, Austria, Institut für Materialphysik, Universität Wien, A-1090 Vienna, Austria, and Department of Synchrotron Radiation Research, Institute of Physics, Lund University, S-223 62 Lund, Sweden
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