1
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Li S, Miyazaki T, Nakata A. Theoretical search for characteristic atoms in supported gold nanoparticles: a large-scale DFT study. Phys Chem Chem Phys 2024. [PMID: 38922670 DOI: 10.1039/d4cp01094a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/27/2024]
Abstract
The size and site dependences of atomic and electronic structures in isolated and supported gold nanoparticles have been investigated using large-scale density functional theory (DFT) calculations using multi-site support functions. The effects of the substrate on nanoparticles with diameters of 2 nm and several different shapes have been examined. First, isolated gold nanoparticles with diameters of 0.6 nm (13 atoms) to 4.5 nm (2057 atoms), which have comparable sizes to nanoparticles used in experiments, were considered. To analyse huge amounts of data obtained from large-scale DFT calculations, we performed principal component analysis (PCA), which helps systematically and efficiently clarify the electronic structures of large nanoparticles. The PCA results reveal the site dependence of the electronic structures. Notably, the atoms in the surface and subsurface have different electronic structures to those located in the inner layers, especially at the vertexes of the particles. The convergence of local electronic structures with respect to the particle size has also been demonstrated. For supported nanoparticles, PCA helps indicate which atoms are affected, and how much, by the substrate. The correlation between the PCA results and site dependence of reaction activity is also discussed herein.
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Affiliation(s)
- Shengzhou Li
- Department of Computer Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
- Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan.
| | - Tsuyoshi Miyazaki
- Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan.
| | - Ayako Nakata
- Department of Computer Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
- Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan.
- Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
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2
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Liu Y, Li H, Han R, Ouyang Q, Guo Y, Zhang Z, Mu L, Sainio S, Nordlund D, Zan L, Jiang Z. Unveiling Atomic-Scale Product Selectivity at the Cocatalyst-TiO 2 Interface Using X-Ray Techniques: Insights into Interface Reactivity. SMALL METHODS 2024; 8:e2301120. [PMID: 38009509 DOI: 10.1002/smtd.202301120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 11/02/2023] [Indexed: 11/29/2023]
Abstract
The microstructure at the interface between the cocatalyst and semiconductor plays a vital role in concentrating photo-induced carriers and reactants. However, observing the atomic arrangement of this interface directly using an electron microscope is challenging due to the coverings of the semiconductor and cocatalyst. To address this, multiple metal-semiconductor interfaces on three TiO2 crystal facets (M/TiO2 ─N, where M represents Ag, Au, and Pt, and N represents the 001, 010, and 101 single crystal facets). The identical surface atomic configuration of the TiO2 facets allowed us to investigate the evolution of the microstructure within these constructs using spectroscopies and DFT calculations. For the first time, they observed the transformation of saturated Ti6c ─O bonds into unsaturated Ti5c ─O and Ti6c ─O─Pt bonds on the TiO2 ─010 facet after loading Pt. This transformation have a direct impact on the selectivity of the resulting products, leading to the generation of CO and CH4 at the Ti6c ─O─Pt and Pt sites, respectively. These findings pinpoint the pivotal roles played by the atomic arrangement at the M/TiO2 ─N interfaces and provide valuable insights for the development of new methodologies using conventional lab-grade equipment.
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Affiliation(s)
- Yin Liu
- School of Electrical Engineering and Automation, Wuhan University, Luojiashan, Wuhan, 430072, China
- College of Chemistry and Molecular Sciences, Wuhan University, Luojiashan, Wuhan, 430072, China
| | - Hanqi Li
- School of Electrical Engineering and Automation, Wuhan University, Luojiashan, Wuhan, 430072, China
| | - Rong Han
- School of Electrical Engineering and Automation, Wuhan University, Luojiashan, Wuhan, 430072, China
| | - Qin Ouyang
- College of Chemistry and Molecular Sciences, Wuhan University, Luojiashan, Wuhan, 430072, China
| | - Yuzheng Guo
- School of Electrical Engineering and Automation, Wuhan University, Luojiashan, Wuhan, 430072, China
| | - Zhaofu Zhang
- The Institute of Technological Sciences, Wuhan University, Luojiashan, Wuhan, 430072, China
| | - Linqin Mu
- School for Engineering of Matter, Transport and Energy, Arizon State University, Phoenix, AZ, 85287, USA
| | - Sami Sainio
- SSRL MSD Soft X-rays, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94309, USA
| | - Dennis Nordlund
- SSRL MSD Soft X-rays, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94309, USA
| | - Ling Zan
- School of Electrical Engineering and Automation, Wuhan University, Luojiashan, Wuhan, 430072, China
| | - Zhuo Jiang
- School of Electrical Engineering and Automation, Wuhan University, Luojiashan, Wuhan, 430072, China
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3
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In situ diffraction monitoring of nanocrystals structure evolving during catalytic reaction at their surface. Sci Rep 2023; 13:1469. [PMID: 36702875 PMCID: PMC9879985 DOI: 10.1038/s41598-023-28557-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 01/20/2023] [Indexed: 01/27/2023] Open
Abstract
With decreasing size of crystals the number of their surface atoms becomes comparable to the number of bulk atoms and their powder diffraction pattern becomes sensitive to a changing surface structure. On the example of nanocrystalline gold supported on also nanocrystalline [Formula: see text] we show evolution of (a) the background pattern due to chemisorption phenomena, (b) peak positions due to adsorption on nonstoichiometric [Formula: see text] particles, (c) Au peaks intensity. The results of the measurements, complemented with mass spectrometry gas analysis, point to (1) a multiply twinned structure of gold, (2) high mobility of Au atoms enabling transport phenomena of Au atoms to the surface of ceria while varying the amount of Au in the crystalline form, and (3) reversible [Formula: see text] peaks position shifts on exposure to He-X-He where X is O2, H2, CO or CO oxidation reaction mixture, suggesting solely internal alternations of the [Formula: see text] crystal structure. We found no evidence of ceria lattice oxygen being consumed/supplied at any stage of the process. The work shows possibility of structurally interpreting different contributions to the multi-phase powder diffraction pattern during a complex physico-chemical process, including effects of physi-, chemisorption and surface evolution. It shows a way to structurally interpret heterogeneous catalytic reactions even if no bulk phase transition is involved.
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4
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Insight into the transient inactivation effect on Au/TiO2 catalyst by in-situ DRIFT and UV–vis spectroscopy. Nat Commun 2022; 13:5458. [PMID: 36115847 PMCID: PMC9482617 DOI: 10.1038/s41467-022-33187-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 09/06/2022] [Indexed: 11/21/2022] Open
Abstract
Au catalysts have drawn broad attention for catalytic CO oxidation. However, a molecular-level understanding of the reaction mechanism on a fast time-resolved scale is still lacking. Herein, we apply in situ DRIFTS and UV-Vis spectroscopy to monitor the rapid dynamic changes during CO oxidation over Au/TiO2. A pronounced transient inactivation effect likely due to a structural change of Au/TiO2 induced by the reactants (CO and O2) is observed at the beginning of the reaction. The transient inactivation effect is affected by the ratio of CO and O2 concentrations. More importantly, during the unstable state, the electronic properties of the Au particles change, as indicated by the shift of the CO stretching vibration. UV-Vis spectroscopy corroborates the structure change of Au/TiO2 surface induced by the reactants, which leads to a weakening of the Au catalyst’s ability to be oxidized (less O2 adsorption), resulting in the transient inactivation effect. A molecular-level understanding of the Au-catalyzed CO oxidation on a fast time-resolved scale is still lacking. Here the authors monitor the rapid dynamic changes during CO oxidation over Au/TiO2 using in situ DRIFTS and UV-Vis spectroscopy, and reveal that the catalyst undergoes a surprising structural change at the beginning of the reaction.
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5
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Frey H, Beck A, Huang X, van Bokhoven JA, Willinger MG. Dynamic interplay between metal nanoparticles and oxide support under redox conditions. Science 2022; 376:982-987. [PMID: 35617409 DOI: 10.1126/science.abm3371] [Citation(s) in RCA: 64] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The dynamic interactions between noble metal particles and reducible metal-oxide supports can depend on redox reactions with ambient gases. Transmission electron microscopy revealed that the strong metal-support interaction (SMSI)-induced encapsulation of platinum particles on titania observed under reducing conditions is lost once the system is exposed to a redox-reactive environment containing oxygen and hydrogen at a total pressure of ~1 bar. Destabilization of the metal-oxide interface and redox-mediated reconstructions of titania lead to particle dynamics and directed particle migration that depend on nanoparticle orientation. A static encapsulated SMSI state was reestablished when switching back to purely oxidizing conditions. This work highlights the difference between reactive and nonreactive states and demonstrates that manifestations of the metal-support interaction strongly depend on the chemical environment.
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Affiliation(s)
- H Frey
- Scientific Center of Optical and Electron Microscopy (ScopeM), ETH Zürich, 8093 Zürich, Switzerland.,Institute for Chemical and Bioengineering, ETH Zürich, 8093 Zürich, Switzerland
| | - A Beck
- Institute for Chemical and Bioengineering, ETH Zürich, 8093 Zürich, Switzerland.,Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - X Huang
- Scientific Center of Optical and Electron Microscopy (ScopeM), ETH Zürich, 8093 Zürich, Switzerland.,College of Chemistry, Fuzhou University, Fuzhou 350116, P. R. China
| | - J A van Bokhoven
- Institute for Chemical and Bioengineering, ETH Zürich, 8093 Zürich, Switzerland.,Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - M G Willinger
- Scientific Center of Optical and Electron Microscopy (ScopeM), ETH Zürich, 8093 Zürich, Switzerland
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6
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Yuan W, Zhu B, Fang K, Li XY, Hansen TW, Ou Y, Yang H, Wagner JB, Gao Y, Wang Y, Zhang Z. In situ manipulation of the active Au-TiO
2
interface with atomic precision during CO oxidation. Science 2021; 371:517-521. [DOI: 10.1126/science.abe3558] [Citation(s) in RCA: 69] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 01/04/2021] [Indexed: 01/13/2023]
Affiliation(s)
- Wentao Yuan
- State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
| | - Beien Zhu
- Interdisciplinary Research Center, Zhangjiang Laboratory, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210 China
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800 China
| | - Ke Fang
- State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
| | - Xiao-Yan Li
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800 China
- University of Chinese Academy of Sciences, Beijing, 100049 China
| | - Thomas W. Hansen
- DTU Nanolab, Technical University of Denmark, DK-2800, Kgs. Lyngby, Denmark
| | - Yang Ou
- State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
| | - Hangsheng Yang
- State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
| | - Jakob B. Wagner
- DTU Nanolab, Technical University of Denmark, DK-2800, Kgs. Lyngby, Denmark
| | - Yi Gao
- Interdisciplinary Research Center, Zhangjiang Laboratory, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210 China
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800 China
| | - Yong Wang
- State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
| | - Ze Zhang
- State Key Laboratory of Silicon Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
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7
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van der Wal LI, Turner SJ, Zečević J. Developments and advances in in situ transmission electron microscopy for catalysis research. Catal Sci Technol 2021. [DOI: 10.1039/d1cy00258a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Recent developments and advances in in situ TEM have raised the possibility to study every step during the catalysts' lifecycle. This review discusses the current state, opportunities and challenges of in situ TEM in the realm of catalysis.
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Affiliation(s)
- Lars I. van der Wal
- Materials Chemistry and Catalysis
- Debye Institute for Nanomaterials Science
- Utrecht University
- Utrecht
- The Netherlands
| | - Savannah J. Turner
- Materials Chemistry and Catalysis
- Debye Institute for Nanomaterials Science
- Utrecht University
- Utrecht
- The Netherlands
| | - Jovana Zečević
- Materials Chemistry and Catalysis
- Debye Institute for Nanomaterials Science
- Utrecht University
- Utrecht
- The Netherlands
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8
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AlAqad KM, Kandiel TA, Basheer C. TiO
2
Nanotubes Supported PtO
x
Nanoclusters with Enhanced Mass Activity for Electrocatalytic Hydrogen Evolution. ChemCatChem 2020. [DOI: 10.1002/cctc.202000828] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Khaled M. AlAqad
- Department of Chemistry King Fahd University of Petroleum & Minerals (KFUPM) Dhahran 31261 Saudi Arabia
| | - Tarek A. Kandiel
- Department of Chemistry King Fahd University of Petroleum & Minerals (KFUPM) Dhahran 31261 Saudi Arabia
- K.A.CARE Energy Research & Innovation Center (ERIC) at KFUPM Dhahran 31261 Saudi Arabia
| | - Chanbasha Basheer
- Department of Chemistry King Fahd University of Petroleum & Minerals (KFUPM) Dhahran 31261 Saudi Arabia
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9
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Sankar M, He Q, Engel RV, Sainna MA, Logsdail AJ, Roldan A, Willock DJ, Agarwal N, Kiely CJ, Hutchings GJ. Role of the Support in Gold-Containing Nanoparticles as Heterogeneous Catalysts. Chem Rev 2020; 120:3890-3938. [PMID: 32223178 PMCID: PMC7181275 DOI: 10.1021/acs.chemrev.9b00662] [Citation(s) in RCA: 156] [Impact Index Per Article: 39.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
![]()
In
this review, we discuss selected examples from recent literature
on the role of the support on directing the nanostructures of Au-based
monometallic and bimetallic nanoparticles. The role of support is
then discussed in relation to the catalytic properties of Au-based
monometallic and bimetallic nanoparticles using different gas phase
and liquid phase reactions. The reactions discussed include CO oxidation,
aerobic oxidation of monohydric and polyhydric alcohols, selective
hydrogenation of alkynes, hydrogenation of nitroaromatics, CO2 hydrogenation, C–C coupling, and methane oxidation.
Only studies where the role of support has been explicitly studied
in detail have been selected for discussion. However, the role of
support is also examined using examples of reactions involving unsupported
metal nanoparticles (i.e., colloidal nanoparticles). It is clear that
the support functionality can play a crucial role in tuning the catalytic
activity that is observed and that advanced theory and characterization
add greatly to our understanding of these fascinating catalysts.
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Affiliation(s)
| | - Qian He
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K.,Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117575
| | - Rebecca V Engel
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K
| | - Mala A Sainna
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K
| | - Andrew J Logsdail
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K
| | - Alberto Roldan
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K
| | - David J Willock
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K
| | - Nishtha Agarwal
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K
| | - Christopher J Kiely
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K.,Department of Materials Science and Engineering, Lehigh University, 5 East Packer Avenue, Bethlehem, Pennsylvania 18015-3195, United States
| | - Graham J Hutchings
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, U.K
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10
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Lawrence EL, Levin BDA, Miller BK, Crozier PA. Approaches to Exploring Spatio-Temporal Surface Dynamics in Nanoparticles with In Situ Transmission Electron Microscopy. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2020; 26:86-94. [PMID: 31858934 DOI: 10.1017/s1431927619015228] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Many nanoparticles in fields such as heterogeneous catalysis undergo surface structural fluctuations during chemical reactions, which may control functionality. These dynamic structural changes may be ideally investigated with time-resolved in situ electron microscopy. We have explored approaches for extracting quantitative information from large time-resolved image data sets with a low signal to noise recorded with a direct electron detector on an aberration-corrected transmission electron microscope. We focus on quantitatively characterizing beam-induced dynamic structural rearrangements taking place on the surface of CeO2 (ceria). A 2D Gaussian fitting procedure is employed to determine the position and occupancy of each atomic column in the nanoparticle with a temporal resolution of 2.5 ms and a spatial precision of 0.25 Å. Local rapid lattice expansions/contractions and atomic migration were revealed to occur on the (100) surface, whereas (111) surfaces were relatively stable throughout the experiment. The application of this methodology to other materials will provide new insights into the behavior of nanoparticle surface reconstructions that were previously inaccessible using other methods, which will have important consequences for the understanding of dynamic structure-property relationships.
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Affiliation(s)
- Ethan L Lawrence
- School for the Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ85287, USA
| | - Barnaby D A Levin
- School for the Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ85287, USA
| | | | - Peter A Crozier
- School for the Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ85287, USA
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11
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Li Z, Ji S, Liu Y, Cao X, Tian S, Chen Y, Niu Z, Li Y. Well-Defined Materials for Heterogeneous Catalysis: From Nanoparticles to Isolated Single-Atom Sites. Chem Rev 2019; 120:623-682. [PMID: 31868347 DOI: 10.1021/acs.chemrev.9b00311] [Citation(s) in RCA: 448] [Impact Index Per Article: 89.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The use of well-defined materials in heterogeneous catalysis will open up numerous new opportunities for the development of advanced catalysts to address the global challenges in energy and the environment. This review surveys the roles of nanoparticles and isolated single atom sites in catalytic reactions. In the second section, the effects of size, shape, and metal-support interactions are discussed for nanostructured catalysts. Case studies are summarized to illustrate the dynamics of structure evolution of well-defined nanoparticles under certain reaction conditions. In the third section, we review the syntheses and catalytic applications of isolated single atomic sites anchored on different types of supports. In the final part, we conclude by highlighting the challenges and opportunities of well-defined materials for catalyst development and gaining a fundamental understanding of their active sites.
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Affiliation(s)
- Zhi Li
- Department of Chemistry , Tsinghua University , Beijing 100084 , China
| | - Shufang Ji
- Department of Chemistry , Tsinghua University , Beijing 100084 , China
| | - Yiwei Liu
- Department of Chemistry , Tsinghua University , Beijing 100084 , China
| | - Xing Cao
- Department of Chemistry , Tsinghua University , Beijing 100084 , China
| | - Shubo Tian
- Department of Chemistry , Tsinghua University , Beijing 100084 , China
| | - Yuanjun Chen
- Department of Chemistry , Tsinghua University , Beijing 100084 , China
| | - Zhiqiang Niu
- Department of Chemical Engineering , Tsinghua University , Beijing 100084 , China
| | - Yadong Li
- Department of Chemistry , Tsinghua University , Beijing 100084 , China
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12
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Liu P, Wu T, Madsen J, Schiøtz J, Wagner JB, Hansen TW. Transformations of supported gold nanoparticles observed by in situ electron microscopy. NANOSCALE 2019; 11:11885-11891. [PMID: 31184684 DOI: 10.1039/c9nr02731a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Oxide supported metal nanoparticles play an important role in heterogeneous catalysis. However, understanding the metal/oxide interface and their evolution under reaction conditions remains challenging. Herein, we investigate the interface between Au nanoparticles and a CeO2 substrate by environmental transmission electron microscopy with atomic resolution. We find that the Au nanoparticles have two preferential epitaxial relationships with the substrate, i.e. Type I (111)[-110]CeO2//(111)[-110]Au and Type II (111)[-110]CeO2//(111)[1-10]Au orientation relationships, where Type I is preferred. In situ observations in the presence of O2 show that the gas can stimulate the supported Au nanoparticles to transform between these two orientations even at room temperature. Moreover, when increasing the temperature to 973 K, the transformation of an Au nanoparticle between the two orientation states and a non-crystalline state in the presence of O2 is also observed. DFT calculations of the binding between Au and CeO2 in the two relationships are strongly influenced by the presence of oxygen vacancies. For a given position of a vacancy, there is a significant energy difference between the energy of the two types. However, for some positions, Type I is preferred, and for others, Type II, but the most favourable position of the vacancy for the two types has a very similar energy. This is consistent with the observation of both types of adhesion.
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Affiliation(s)
- Pei Liu
- DTU Nanolab, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
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13
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Yu J, Li XY, Miao J, Yuan W, Zhou S, Zhu B, Gao Y, Yang H, Zhang Z, Wang Y. Atomic Mechanism in Layer-by-Layer Growth via Surface Reconstruction. NANO LETTERS 2019; 19:4205-4210. [PMID: 31145634 DOI: 10.1021/acs.nanolett.9b01934] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Layer-by-layer growth played a critical role in the fine design of novel materials and devices. Although it has been widely studied during materials synthesis, the atomic mechanism of the growth remains unclear due to the lack of direct observation at the atomic scale. Here, we report a new mode in layer-by-layer growth via surface reconstruction on MoO2 (011) by environmental transmission electron microscopy and density functional theory calculations. Our in situ environmental transmission electron microscopy results demonstrate that the layer-by-layer growth of MoO2 experiences two steps that occur in an oscillatory manner: (1) the formation of an atomic ledge by transforming a section of the reconstructed layer to the intrinsic surface layer and then (2) the spontaneous reconstruction of the newly formed intrinsic surface section. Thus, the surface reconstruction can be considered as an intermediated phase during the layer-by-layer growth of MoO2. A similar phenomenon was also observed in the MoO2 dissolution procedure.
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Affiliation(s)
| | - Xiao-Yan Li
- Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology , Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Junjian Miao
- Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology , Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800 , China
| | | | | | - Beien Zhu
- Shanghai Advanced Research Institute, Chinese Academy of Sciences , Shanghai 201210 , China
| | - Yi Gao
- Shanghai Advanced Research Institute, Chinese Academy of Sciences , Shanghai 201210 , China
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14
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Wei X, Shao B, Zhou Y, Li Y, Jin C, Liu J, Shen W. Geometrical Structure of the Gold–Iron(III) Oxide Interfacial Perimeter for CO Oxidation. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201805975] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xuejiao Wei
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
| | - Bin Shao
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
| | - Yan Zhou
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
| | - Yong Li
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
| | - Chuanchuan Jin
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
| | - Jingyue Liu
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
- Department of Physics Arizona State University Tempe Arizona 85287 USA
| | - Wenjie Shen
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
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15
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Wei X, Shao B, Zhou Y, Li Y, Jin C, Liu J, Shen W. Geometrical Structure of the Gold–Iron(III) Oxide Interfacial Perimeter for CO Oxidation. Angew Chem Int Ed Engl 2018; 57:11289-11293. [DOI: 10.1002/anie.201805975] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 06/19/2018] [Indexed: 11/08/2022]
Affiliation(s)
- Xuejiao Wei
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
| | - Bin Shao
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
| | - Yan Zhou
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
| | - Yong Li
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
| | - Chuanchuan Jin
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
| | - Jingyue Liu
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
- Department of Physics Arizona State University Tempe Arizona 85287 USA
| | - Wenjie Shen
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
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16
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Kamiuchi N, Sun K, Aso R, Tane M, Tamaoka T, Yoshida H, Takeda S. Self-activated surface dynamics in gold catalysts under reaction environments. Nat Commun 2018; 9:2060. [PMID: 29802253 PMCID: PMC5970267 DOI: 10.1038/s41467-018-04412-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 04/26/2018] [Indexed: 11/11/2022] Open
Abstract
Nanoporous gold (NPG) with sponge-like structures has been studied by atomic-scale and microsecond-resolution environmental transmission electron microscopy (ETEM) combined with ab initio energy calculations. Peculiar surface dynamics were found in the reaction environment for the oxidation of CO at room temperature, involving residual silver in the NPG leaves as well as gold and oxygen atoms, especially on {110} facets. The NPG is thus classified as a novel self-activating catalyst. The essential structure unit for catalytic activity was identified as Au–AgO surface clusters, implying that the NPG is regarded as a nano-structured silver oxide catalyst supported on the matrix of NPG, or an inverse catalyst of a supported gold nanoparticulate (AuNP) catalyst. Hence, the catalytically active structure in the gold catalysts (supported AuNP and NPG catalysts) can now be experimentally unified in low-temperature CO oxidation, a step forward towards elucidating the fascinating catalysis mechanism of gold. Nanoporous gold (NPG) has gained significant attention, but its catalytically active structure has not yet been clarified. Here, the authors identify the catalytically active and dynamic structure in NPG by combining atomic-scale and microsecond-resolution environmental transmission electron microscopy with ab initio calculations.
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Affiliation(s)
- Naoto Kamiuchi
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan
| | - Keju Sun
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan.,Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31, Midorigaoka, Ikeda, Osaka, 563-8577, Japan.,Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, 438 Hebei Avenue, Qinhuangdao, 066004 Hebei, China
| | - Ryotaro Aso
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan
| | - Masakazu Tane
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan
| | - Takehiro Tamaoka
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan
| | - Hideto Yoshida
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan
| | - Seiji Takeda
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan.
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17
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Jiang W, Ji W, Au CT. Surface/Interfacial Catalysis of (Metal)/Oxide System: Structure and Performance Control. ChemCatChem 2018. [DOI: 10.1002/cctc.201701958] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Wu Jiang
- Key Laboratory of Mesoscopic Chemistry, MOE, School of Chemistry and Chemical Engineering; Nanjing University; Nanjing 210023 P.R. China
| | - Weijie Ji
- Key Laboratory of Mesoscopic Chemistry, MOE, School of Chemistry and Chemical Engineering; Nanjing University; Nanjing 210023 P.R. China
| | - Chak-Tong Au
- Department of Chemistry; Hong Kong Baptist University, Kowloon Tong; Hong Kong P.R. China
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18
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Tada K, Maeda Y, Koga H, Okumura M. TiO2 Crystal Structure Dependence of Low-temperature CO Oxidation Catalyzed by Au/TiO2. CHEM LETT 2018. [DOI: 10.1246/cl.170989] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Kohei Tada
- Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Yasushi Maeda
- Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Hiroaki Koga
- Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, 1-30 Goryo Ohara, Nishikyo, Kyoto 615-8245, Japan
| | - Mitsutaka Okumura
- Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, 1-30 Goryo Ohara, Nishikyo, Kyoto 615-8245, Japan
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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19
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Tada K, Koga H, Hayashi A, Kondo Y, Kawakami T, Yamanaka S, Okumura M. Theoretical Clarification of the Coexistence of Cl Effects on Au/TiO2: The Interaction between Au Clusters and the TiO2 Surface, and the Aggregation of Au Clusters on the TiO2 Surface. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2017. [DOI: 10.1246/bcsj.20160359] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Kohei Tada
- Department of Energy and Environment, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043
| | - Hiroaki Koga
- Element Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520
| | - Akihide Hayashi
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043
| | - Yudai Kondo
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043
| | - Takashi Kawakami
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043
| | - Shusuke Yamanaka
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043
| | - Mitsutaka Okumura
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043
- Element Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520
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20
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21
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Gao W, Hood ZD, Chi M. Interfaces in Heterogeneous Catalysts: Advancing Mechanistic Understanding through Atomic-Scale Measurements. Acc Chem Res 2017; 50:787-795. [PMID: 28207240 DOI: 10.1021/acs.accounts.6b00596] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Developing novel catalysts with high efficiency and selectivity is critical for enabling future clean energy conversion technologies. Interfaces in catalyst systems have long been considered the most critical factor in controlling catalytic reaction mechanisms. Interfaces include not only the catalyst surface but also interfaces within catalyst particles and those formed by constructing heterogeneous catalysts. The atomic and electronic structures of catalytic surfaces govern the kinetics of binding and release of reactant molecules from surface atoms. Interfaces within catalysts are introduced to enhance the intrinsic activity and stability of the catalyst by tuning the surface atomic and chemical structures. Examples include interfaces between the core and shell, twin or domain boundaries, or phase boundaries within single catalyst particles. In supported catalyst nanoparticles (NPs), the interface between the metallic NP and support serves as a critical tuning factor for enhancing catalytic activity. Surface electronic structure can be indirectly tuned and catalytically active sites can be increased through the use of supporting oxides. Tuning interfaces in catalyst systems has been identified as an important strategy in the design of novel catalysts. However, the governing principle of how interfaces contribute to catalyst behavior, especially in terms of interactions with intermediates and their stability during electrochemical operation, are largely unknown. This is mainly due to the evolving nature of such interfaces. Small changes in the structural and chemical configuration of these interfaces may result in altering the catalytic performance. These interfacial arrangements evolve continuously during synthesis, processing, use, and even static operation. A technique that can probe the local atomic and electronic interfacial structures with high precision while monitoring the dynamic interfacial behavior in situ is essential for elucidating the role of interfaces and providing deeper insight for fine-tuning and optimizing catalyst properties. Scanning transmission electron microscopy (STEM) has long been a primary characterization technique used for studying nanomaterials because of its exceptional imaging resolution and simultaneous chemical analysis. Over the past decade, advances in STEM, that is, the commercialization of both aberration correctors and monochromators, have significantly improved the spatial and energy resolution. Imaging atomic structures with subangstrom resolution and identifying chemical species with single-atom sensitivity are now routine for STEM. These advancements have greatly benefitted catalytic research. For example, the roles of lattice strain and surface elemental distribution and their effect on catalytic stability and reactivity have been well documented in bimetallic catalysts. In addition, three-dimensional atomic structures revealed by STEM tomography have been integrated in theoretical modeling for predictive catalyst NP design. Recent developments in stable electronic and mechanical devices have opened opportunities to monitor the evolution of catalysts in operando under synthesis and reaction conditions; high-speed direct electron detectors have achieved sub-millisecond time resolutions and allow for rapid structural and chemical changes to be captured. Investigations of catalysts using these latest microscopy techniques have provided new insights into atomic-level catalytic mechanisms. Further integration of new microscopy methods is expected to provide multidimensional descriptions of interfaces under relevant synthesis and reaction conditions. In this Account, we discuss recent insights on understanding catalyst activity, selectivity, and stability using advanced STEM techniques, with an emphasis on how critical interfaces dictate the performance of precious metal-based heterogeneous catalysts. The role of extended interfacial structures, including those between core and shell, between separate phases and twinned grains, between the catalyst surface and gas, and between metal and support are discussed. We also provide an outlook on how emerging electron microscopy techniques, such as vibrational spectroscopy and electron ptychography, will impact future catalysis research.
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Affiliation(s)
- Wenpei Gao
- Center for Nanophase
Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Department of Chemical Engineering and Materials Science, University of California, Irvine, Irvine, California 92697, United States
| | - Zachary D. Hood
- Center for Nanophase
Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- School of
Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Miaofang Chi
- Center for Nanophase
Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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22
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Li X, Cheng S, Deng S, Wei X, Zhu J, Chen Q. Direct Observation of the Layer-by-Layer Growth of ZnO Nanopillar by In situ High Resolution Transmission Electron Microscopy. Sci Rep 2017; 7:40911. [PMID: 28098261 PMCID: PMC5241657 DOI: 10.1038/srep40911] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Accepted: 12/12/2016] [Indexed: 01/18/2023] Open
Abstract
Catalyst-free methods are important for the fabrication of pure nanowires (NWs). However, the growth mechanism remains elusive due to the lack of crucial information on the growth dynamics at atomic level. Here, the noncatalytic growth process of ZnO NWs is studied through in situ high resolution transmission electron microscopy. We observe the layer-by-layer growth of ZnO nanopillars along the polar [0001] direction under electron beam irradiation, while no growth is observed along the radial directions, indicating an anisotropic growth mechanism. The source atoms are mainly from the electron beam induced damage of the sample and the growth is assisted by subsequent absorption and then diffusion of atoms along the side surface to the top (0002) surface. The different binding energy on different ZnO surface is the main origin for the anisotropic growth. Additionally, the coalescence of ZnO nanocrystals related to the nucleation stage is uncovered to realize through the rotational motions and recrystallization. Our in situ results provide atomic-level detailed information about the dynamic growth and coalescence processes in the noncatalytic synthesis of ZnO NW and are helpful for understanding the vapor-solid mechanism of catalyst-free NW growth.
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Affiliation(s)
- Xing Li
- Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, P.R. China
| | - Shaobo Cheng
- National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, The State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Advanced Materials (MOE), Tsinghua University, Beijing 100084, P.R. China.,Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, P.R. China
| | - Shiqing Deng
- National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, The State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Advanced Materials (MOE), Tsinghua University, Beijing 100084, P.R. China
| | - Xianlong Wei
- Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, P.R. China
| | - Jing Zhu
- National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, The State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Advanced Materials (MOE), Tsinghua University, Beijing 100084, P.R. China.,Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, P.R. China
| | - Qing Chen
- Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, P.R. China
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23
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Li Y, Du Y, Wei Y, Zhao Z, Jin B, Zhang X, Liu J. Catalysts of 3D ordered macroporous ZrO2-supported core–shell Pt@CeO2−x nanoparticles: effect of the optimized Pt–CeO2 interface on improving the catalytic activity and stability of soot oxidation. Catal Sci Technol 2017. [DOI: 10.1039/c6cy02441f] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The catalytic performance of 3D-OM Pt1.0@CeO2−x/ZrO2-1 is better than that of 3D-OM Pt1.0/ZrO2.
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Affiliation(s)
- Yazhao Li
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing
- China
| | - Yuhao Du
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing
- China
| | - Yuechang Wei
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing
- China
| | - Zhen Zhao
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing
- China
- Institute of Catalysis for Energy and Environment
| | - Baofang Jin
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing
- China
| | - Xindong Zhang
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing
- China
| | - Jian Liu
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing
- China
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24
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Tao F(F, Crozier PA. Atomic-Scale Observations of Catalyst Structures under Reaction Conditions and during Catalysis. Chem Rev 2016; 116:3487-539. [DOI: 10.1021/cr5002657] [Citation(s) in RCA: 203] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Franklin (Feng) Tao
- Department
of Chemical and Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States
- Department
of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States
| | - Peter A. Crozier
- School
of Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287, United States
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25
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Okumura M, Haruta M. Interplay of theoretical calculations and experiments for a study of catalysis by gold. Catal Today 2016. [DOI: 10.1016/j.cattod.2015.05.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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26
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Gai PL, Yoshida K, Ward MR, Walsh M, Baker RT, van de Water L, Watson MJ, Boyes ED. Visualisation of single atom dynamics in water gas shift reaction for hydrogen generation. Catal Sci Technol 2016. [DOI: 10.1039/c5cy01154j] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In situ real time single atom resolution observations of dynamic water gas shift catalysts in CO + water (WGS) environments.
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Affiliation(s)
- Pratibha L. Gai
- The York Nanocentre
- University of York
- , UK
- Department of Chemistry
- University of York
| | - Kenta Yoshida
- The York Nanocentre
- University of York
- , UK
- Institute for Advanced Research
- Nagoya University
| | - Michael R. Ward
- The York Nanocentre
- University of York
- , UK
- Department of Physics
- University of York
| | - Michael Walsh
- The York Nanocentre
- University of York
- , UK
- Department of Physics
- University of York
| | | | | | | | - Edward D. Boyes
- The York Nanocentre
- University of York
- , UK
- Department of Physics
- University of York
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27
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Han HL, Melaet G, Alayoglu S, Somorjai GA. In Situ Microscopy and Spectroscopy Applied to Surfaces at Work. ChemCatChem 2015. [DOI: 10.1002/cctc.201500642] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Hui-Ling Han
- Materials Sciences Division; Lawrence Berkeley National Laboratory; 1 Cyclotron Road Berkeley CA 94720 USA
| | - Gérôme Melaet
- Materials Sciences Division; Lawrence Berkeley National Laboratory; 1 Cyclotron Road Berkeley CA 94720 USA
| | - Selim Alayoglu
- Chemical Sciences Division; Lawrence Berkeley National Laboratory; 1 Cyclotron Road Berkeley CA 94720-8176 USA
| | - Gabor A. Somorjai
- Chemical Sciences Division; Lawrence Berkeley National Laboratory; 1 Cyclotron Road Berkeley CA 94720-8176 USA
- College of Chemistry; University of California at Berkeley; 420 Latimer Hall Berkeley CA 94720-1460 USA
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28
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Bordiga S, Lamberti C, Bonino F, Travert A, Thibault-Starzyk F. Probing zeolites by vibrational spectroscopies. Chem Soc Rev 2015; 44:7262-341. [PMID: 26435467 DOI: 10.1039/c5cs00396b] [Citation(s) in RCA: 188] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
This review addresses the most relevant aspects of vibrational spectroscopies (IR, Raman and INS) applied to zeolites and zeotype materials. Surface Brønsted and Lewis acidity and surface basicity are treated in detail. The role of probe molecules and the relevance of tuning both the proton affinity and the steric hindrance of the probe to fully understand and map the complex site population present inside microporous materials are critically discussed. A detailed description of the methods needed to precisely determine the IR absorption coefficients is given, making IR a quantitative technique. The thermodynamic parameters of the adsorption process that can be extracted from a variable-temperature IR study are described. Finally, cutting-edge space- and time-resolved experiments are reviewed. All aspects are discussed by reporting relevant examples. When available, the theoretical literature related to the reviewed experimental results is reported to support the interpretation of the vibrational spectra on an atomic level.
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Affiliation(s)
- Silvia Bordiga
- Department of Chemistry, NIS and INSTM Reference Centers, University of Torino, Via Quarello 15, I-10135 Torino, Italy
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29
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Strong Local Coordination Structure Effects on Subnanometer PtOx Clusters over CeO2 Nanowires Probed by Low-Temperature CO Oxidation. ACS Catal 2015. [DOI: 10.1021/acscatal.5b00832] [Citation(s) in RCA: 172] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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30
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Takeda S, Kuwauchi Y, Yoshida H. Environmental transmission electron microscopy for catalyst materials using a spherical aberration corrector. Ultramicroscopy 2015; 151:178-190. [DOI: 10.1016/j.ultramic.2014.11.017] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Revised: 11/13/2014] [Accepted: 11/15/2014] [Indexed: 11/29/2022]
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31
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Su DS, Zhang B, Schlögl R. Electron microscopy of solid catalysts--transforming from a challenge to a toolbox. Chem Rev 2015; 115:2818-82. [PMID: 25826447 DOI: 10.1021/cr500084c] [Citation(s) in RCA: 142] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Dang Sheng Su
- †Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China.,‡Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Bingsen Zhang
- †Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
| | - Robert Schlögl
- ‡Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
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32
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Transmission electron microscopy of thiol-capped Au clusters on C: Structure and electron irradiation effects. Micron 2015; 70:41-9. [PMID: 25554918 DOI: 10.1016/j.micron.2014.12.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Revised: 12/03/2014] [Accepted: 12/03/2014] [Indexed: 11/24/2022]
Abstract
High-resolution transmission electron microscopy is used to study interactions between thiol-capped Au clusters and amorphous C support films. The morphologies of the clusters are found to depend both on their size and on the local structure of the underlying C. When the C is amorphous, larger Au clusters are crystalline, while smaller clusters are typically disordered. When the C is graphitic, the Au particles adopt either elongated shapes that maximize their contact with the edge of the C film or planar arrays when they contain few Au atoms. We demonstrate the influence of electron beam irradiation on the structure, shape and stability of the Au clusters, as well as on the formation of holes bounded by terraces of graphitic lamellae in the underlying C.
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33
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Xiang X, Nie J, Sun K, Zhang L, Liu W, Schwank J, Wang S, Zhong M, Gao F, Zu X. Structural evolution of NiAu nanoparticles under ambient conditions directly revealed by atom-resolved imaging combined with DFT simulation. NANOSCALE 2014; 6:12898-12904. [PMID: 25230836 DOI: 10.1039/c4nr03559c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
From an economic point of view, the structural stability of noble-transition bimetallic catalysts is as significant as their well-studied catalytic efficiency. The structural evolution and corresponding dynamics of NiAu bimetallic nanoparticles under ambient conditions are investigated using in situ Cs-corrected STEM and DFT calculations. During oxidization, the Au component promotes dissociation of oxygen and initiates Ni oxidization, which simultaneously drives the migration of Au atoms, thus yielding multi-shell structures (denoted by Ni@Au@NiO). The subsequent hydrogen reduction induces surface reconstruction, forming fcc-NiAu clusters. After several cycles of catalyzing CO oxidization, both inverse Au segregation and Ni recrystallization occur, which are ascribed to exothermic excitation. The results of this study can help researchers understand the evolutionary behaviors of the bimetallic nanoparticles under ambient conditions as well as optimize the structural design of bimetallic catalysts.
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Affiliation(s)
- Xia Xiang
- School of Physical Electronics and Institute of Fundmental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China.
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34
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Yoshida H, Omote H, Takeda S. Oxidation and reduction processes of platinum nanoparticles observed at the atomic scale by environmental transmission electron microscopy. NANOSCALE 2014; 6:13113-13118. [PMID: 25248870 DOI: 10.1039/c4nr04352a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Oxidation and reduction of the surfaces of Pt nanoparticles were in situ examined in reactive gases (O2, CO and H2O vapor) by aberration-corrected environmental transmission electron microscopy. Atomic layers of Pt oxides were gradually formed on the surface of Pt nanoparticles at room temperature in O2. The surface Pt oxides were reduced to Pt promptly in both vacuum and gas including CO. We showed that H2O vapor suppressed the surface oxidation. The processes found in this study were induced by gases that were most likely activated by electron irradiation. The observation results provide atomistic insight into the oxidation and reduction process of the surface of Pt nanoparticles that is exposed to activated gases.
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Affiliation(s)
- Hideto Yoshida
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.
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35
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Ouyang X, Yuan S, Qiu Q, Zeng W, Hope GA, Li H. Facile synthesis of porous Pr(OH)3 nanowire bundles and their magnetic properties. INORG CHEM COMMUN 2014. [DOI: 10.1016/j.inoche.2014.04.032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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36
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Mafuné F, Okamoto T, Ito M. Surfactant-free small Ni nanoparticles trapped on silica nanoparticles prepared by pulsed laser ablation in liquid. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2013.11.034] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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37
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Jinschek JR. Advances in the environmental transmission electron microscope (ETEM) for nanoscale in situ studies of gas–solid interactions. Chem Commun (Camb) 2014; 50:2696-706. [DOI: 10.1039/c3cc49092k] [Citation(s) in RCA: 107] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
This review highlights how ETEM technology advances have enabled new essential (structural) information that improve our understanding of nanomaterials' structure–property–function relationships.
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Affiliation(s)
- J. R. Jinschek
- FEI Company
- Materials Science BU
- Eindhoven, The Netherlands
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