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Ratcliff LE, Oshima T, Nippert F, Janzen BM, Kluth E, Goldhahn R, Feneberg M, Mazzolini P, Bierwagen O, Wouters C, Nofal M, Albrecht M, Swallow JEN, Jones LAH, Thakur PK, Lee TL, Kalha C, Schlueter C, Veal TD, Varley JB, Wagner MR, Regoutz A. Tackling Disorder in γ-Ga 2 O 3. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2204217. [PMID: 35866491 DOI: 10.1002/adma.202204217] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 07/05/2022] [Indexed: 06/15/2023]
Abstract
Ga2 O3 and its polymorphs are attracting increasing attention. The rich structural space of polymorphic oxide systems such as Ga2 O3 offers potential for electronic structure engineering, which is of particular interest for a range of applications, such as power electronics. γ-Ga2 O3 presents a particular challenge across synthesis, characterization, and theory due to its inherent disorder and resulting complex structure-electronic-structure relationship. Here, density functional theory is used in combination with a machine-learning approach to screen nearly one million potential structures, thereby developing a robust atomistic model of the γ-phase. Theoretical results are compared with surface and bulk sensitive soft and hard X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, spectroscopic ellipsometry, and photoluminescence excitation spectroscopy experiments representative of the occupied and unoccupied states of γ-Ga2 O3 . The first onset of strong absorption at room temperature is found at 5.1 eV from spectroscopic ellipsometry, which agrees well with the excitation maximum at 5.17 eV obtained by photoluminescence excitation spectroscopy, where the latter shifts to 5.33 eV at 5 K. This work presents a leap forward in the treatment of complex, disordered oxides and is a crucial step toward exploring how their electronic structure can be understood in terms of local coordination and overall structure.
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Affiliation(s)
- Laura E Ratcliff
- Department of Materials, Imperial College London, London, SW7 2AZ, UK
- Center for Computational Chemistry, School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK
| | - Takayoshi Oshima
- Department of Electrical and Electronic Engineering, Saga University, Saga, 840-8502, Japan
| | - Felix Nippert
- Technische Universität Berlin, Institute of Solid State Physics, Hardenbergstrasse 36, 10623, Berlin, Germany
| | - Benjamin M Janzen
- Technische Universität Berlin, Institute of Solid State Physics, Hardenbergstrasse 36, 10623, Berlin, Germany
| | - Elias Kluth
- Institut für Physik, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany
| | - Rüdiger Goldhahn
- Institut für Physik, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany
| | - Martin Feneberg
- Institut für Physik, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany
| | - Piero Mazzolini
- Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Hausvogteiplatz 5-7, 10117, Berlin, Germany
| | - Oliver Bierwagen
- Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Hausvogteiplatz 5-7, 10117, Berlin, Germany
| | - Charlotte Wouters
- Leibniz-Institut für Kristallzüchtung, Max-Born-Str. 2, 12489, Berlin, Germany
| | - Musbah Nofal
- Leibniz-Institut für Kristallzüchtung, Max-Born-Str. 2, 12489, Berlin, Germany
| | - Martin Albrecht
- Leibniz-Institut für Kristallzüchtung, Max-Born-Str. 2, 12489, Berlin, Germany
| | - Jack E N Swallow
- Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK
| | - Leanne A H Jones
- Stephenson Institute for Renewable Energy and Department of Physics, University of Liverpool, Liverpool, L69 7ZF, UK
| | - Pardeep K Thakur
- Diamond Light Source Ltd., Diamond House, Harwell Science and Innovation Campus, Didcot, OX11 0DE, UK
| | - Tien-Lin Lee
- Diamond Light Source Ltd., Diamond House, Harwell Science and Innovation Campus, Didcot, OX11 0DE, UK
| | - Curran Kalha
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK
| | - Christoph Schlueter
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607, Hamburg, Germany
| | - Tim D Veal
- Stephenson Institute for Renewable Energy and Department of Physics, University of Liverpool, Liverpool, L69 7ZF, UK
| | - Joel B Varley
- Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Markus R Wagner
- Technische Universität Berlin, Institute of Solid State Physics, Hardenbergstrasse 36, 10623, Berlin, Germany
| | - Anna Regoutz
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK
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Abstract
Though γ-Al2O3 has played a central role in heterogeneous catalysis for more than two centuries, its microstructure continues to be debated. Specifically, the positions of Al3+ cations within the crystal lattice have been discussed extensively in the literature. Many authors uphold that the cations primarily occupy spinel sites, while others endorse the occupation of non-spinel sites. The other main point of dispute is whether the structure contains interstitial hydrogen, with some authors supporting a partially hydrated model and others claiming that the structure must be completely dehydrated. The use of different structural models directly affects the predicted geometry of γ-Al2O3 at the surface, which in turn has significant implications for its catalytic utility. A comparison of theoretical data to experimental infrared (IR), X-ray diffraction (XRD), and selected area electron diffraction (SAED) evidence suggests that γ-Al2O3 features cations primarily in spinel positions, while IR and nuclear magnetic resonance (NMR) data indicate that interstitial hydrogen is present within the bulk structure.
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Acikgoz M, Khoshi MR, Harrell J, Genova A, Chawla R, He H, Pavanello M. Tuning the electronic properties of the γ-Al 2O 3 surface by phosphorus doping. Phys Chem Chem Phys 2019; 21:15080-15088. [PMID: 31241103 DOI: 10.1039/c9cp03105g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Tuning the electronic properties of oxide surfaces is of pivotal importance, because they find applicability in a variety of industrial processes, including catalysis. Currently, the industrial protocols for synthesizing oxide surfaces are limited to only partial control of the oxide's properties. This is because the ceramic processes result in complex morphologies and a priori unpredictable behavior of the products. While the bulk doping of alumina surfaces has been demonstrated to enhance their catalytic applications (i.e. hydrodesulphurization (HDS)), the fundamental understanding of this phenomenon and its effect at an atomic level remain unexplored. In our joint experimental and computational study, simulations based on Density Functional Theory (DFT), synthesis, and a variety of surface characterization techniques are exploited for the specific goal of understanding the structure-function relationship of phosphorus-doped γ-Al2O3 surfaces. Our theoretical calculations and experimental results agree in finding that P doping of γ-Al2O3 leads to a significant decrease in its work function. Our computational models show that this decrease is due to the formation of a new surface dipole, providing a clear picture of the effect of P doping at the surface of γ-Al2O3. In this study, we uncover a general paradigm for tuning support-catalyst interactions that involves electrostatic properties of doped γ-Al2O3 surface, specifically the surface dipole. Our findings open a new pathway for engineering the electronic properties of metal oxides' surfaces.
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Affiliation(s)
- Muhammed Acikgoz
- Department of Chemistry, Rutgers University, Newark, NJ 07102, USA.
| | - M Reza Khoshi
- Department of Chemistry, Rutgers University, Newark, NJ 07102, USA.
| | - Jaren Harrell
- Department of Chemistry, Rutgers University, Newark, NJ 07102, USA.
| | | | - Rupali Chawla
- Department of Chemistry, Rutgers University, Newark, NJ 07102, USA.
| | - Huixin He
- Department of Chemistry, Rutgers University, Newark, NJ 07102, USA.
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Takasao G, Wada T, Thakur A, Chammingkwan P, Terano M, Taniike T. Machine Learning-Aided Structure Determination for TiCl4–Capped MgCl2 Nanoplate of Heterogeneous Ziegler–Natta Catalyst. ACS Catal 2019. [DOI: 10.1021/acscatal.8b05080] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gentoku Takasao
- Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Toru Wada
- Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
- Dutch Polymer Institute (DPI), P.O. Box 902, 5600 AX Eindhoven, The Netherlands
| | - Ashutosh Thakur
- Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Patchanee Chammingkwan
- Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
- Dutch Polymer Institute (DPI), P.O. Box 902, 5600 AX Eindhoven, The Netherlands
| | - Minoru Terano
- Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
- Dutch Polymer Institute (DPI), P.O. Box 902, 5600 AX Eindhoven, The Netherlands
| | - Toshiaki Taniike
- Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
- Dutch Polymer Institute (DPI), P.O. Box 902, 5600 AX Eindhoven, The Netherlands
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Wang YQ, Yan XF, Xiao W, Shao YX. DFT Analysis of the Adsorption of Methyl Nitrate on Al 2
O 3
Surfaces. B KOREAN CHEM SOC 2017. [DOI: 10.1002/bkcs.11136] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yan-qun Wang
- College of Chemistry and Environmental Engineering; Yangtze University; Jingzhou 434023 China
| | - Xiu-fen Yan
- School of Environmental and Chemical Engineering; Jiangsu University of Science and Technology; Zhenjiang 212003 China
| | - Wei Xiao
- College of Chemistry and Environmental Engineering; Yangtze University; Jingzhou 434023 China
| | - You-xiang Shao
- School of Materials Science and Engineering; Sun Yat-sen University; Guangzhou 510275 China
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Yang T, Ehara M. Probing the electronic structures of Con (n = 1–5) clusters on γ-Al2O3 surfaces using first-principles calculations. Phys Chem Chem Phys 2017; 19:3679-3687. [DOI: 10.1039/c6cp06785a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Using density functional theory calculations, we discussed the geometric and electronic structures and nucleation of small Co clusters on γ-Al2O3(100) and γ-Al2O3(110) surfaces.
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Affiliation(s)
- Tao Yang
- Institute for Molecular Science
- Research Center for Computational Science
- Myodaiji
- Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB)
| | - Masahiro Ehara
- Institute for Molecular Science
- Research Center for Computational Science
- Myodaiji
- Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB)
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Muratsugu S, Weng Z, Nakai H, Isobe K, Kushida Y, Sasaki T, Tada M. Surface-assisted transfer hydrogenation catalysis on a γ-Al2O3-supported Ir dimer. Phys Chem Chem Phys 2014; 14:16023-31. [PMID: 23104018 DOI: 10.1039/c2cp43106h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel oxide-supported Ir dimer, which was found to be active for transfer hydrogenation of aromatic ketones, was prepared on a γ-Al(2)O(3) surface from an Ir dimer complex [Ir(2){η(5)-C(5)(CH(3))(5)}(2)(μ-CH(2))(2)] (Ir(2)) with an Ir=Ir bond. Detailed characterization of the γ-Al(2)O(3)-supported Ir dimer (Ir(2)/γ-Al(2)O(3)) revealed that the structure of Ir(2) consisted of an Ir dimer with an Ir-Ir bond attached to the γ-Al(2)O(3) surface by two bridged Ir-(OAl)(2)-Ir bonds. The supported Ir(2)/γ-Al(2)O(3) dimer with bridged Ir-(OAl)(2)-Ir bonds acted as an efficient catalyst for transfer hydrogenation (turnover number of acetophenone = 699 (24 h)), while homogeneous Ir(2), SiO(2)- and MgO-supported Ir(2) were much less active. A structural transformation at the interface of the Ir dimer and the γ-Al(2)O(3) surface was suggested to assist the transfer hydrogenation catalysis via the formation of an Ir(2)-H(2) species on the γ-Al(2)O(3) surface (Ir(2)-H(2)/γ-Al(2)O(3)) as a key intermediate in the transfer hydrogenation. The present study deepened the understanding of the role and dynamic behaviour of the oxide surface in the hydrogen transfer catalysis on the supported Ir dimer.
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Affiliation(s)
- Satoshi Muratsugu
- Institute for Molecular Science, Nishigo-naka, Myodaiji, Okazaki, Aichi, Japan
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Zhang L, Dong L, Yu W, Liu L, Deng Y, Liu B, Wan H, Gao F, Sun K, Dong L. Effect of cobalt precursors on the dispersion, reduction, and CO oxidation of CoOx/γ-Al2O3 catalysts calcined in N2. J Colloid Interface Sci 2011; 355:464-71. [DOI: 10.1016/j.jcis.2010.11.076] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2010] [Revised: 11/20/2010] [Accepted: 11/24/2010] [Indexed: 10/18/2022]
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9
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Dabbagh HA, Zamani M, Davis BH. Nanoscale surface study and reactions mechanism of 2-butanol over the γ-alumina (100) surface and nanochannel: A DFT study. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.molcata.2010.09.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Taniike T, Tada M, Coquet R, Morikawa Y, Sasaki T, Iwasawa Y. A novel mechanism for spectator CO-mediated reaction with unique cis-(NO)2 dimer on a Co2+-dimer/γ-Al2O3(110) model catalyst: Density functional theory calculations. Catal Today 2010. [DOI: 10.1016/j.cattod.2010.03.048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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11
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Tada M. Surface-Mediated Design and Catalytic Properties of Active Metal Complexes for Advanced Catalysis Creation. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2010. [DOI: 10.1246/bcsj.20090336] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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12
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Dabbagh HA, Taban K, Zamani M. Effects of vacuum and calcination temperature on the structure, texture, reactivity, and selectivity of alumina: Experimental and DFT studies. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.molcata.2010.04.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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Sautet P, Delbecq F. Catalysis and Surface Organometallic Chemistry: A View from Theory and Simulations. Chem Rev 2009; 110:1788-806. [DOI: 10.1021/cr900295b] [Citation(s) in RCA: 113] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Philippe Sautet
- Université de Lyon, Laboratoire de Chimie, Institut de Chimie de Lyon, École Normale Supérieure de Lyon and CNRS, 46, allée d’Italie, 69364 Lyon Cedex 07, France
| | - Françoise Delbecq
- Université de Lyon, Laboratoire de Chimie, Institut de Chimie de Lyon, École Normale Supérieure de Lyon and CNRS, 46, allée d’Italie, 69364 Lyon Cedex 07, France
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Taniike T, Tada M, Coquet R, Morikawa Y, Sasaki T, Iwasawa Y. A new aspect of heterogeneous catalysis: Highly reactive cis-(NO)2 dimer and Eley–Rideal mechanism for NO–CO reaction on a Co-dimer/γ-alumina catalyst. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.06.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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