1
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Lin L, Shi P, Yao L, Xie K, Tao H, Zhang Z, Wang Y. First-principles study on CO oxidation on CuO(111) surface prefers the Eley-Rideal or Langmuir-Hinshelwood pathway. NANOTECHNOLOGY 2022; 33:205504. [PMID: 35081528 DOI: 10.1088/1361-6528/ac4f19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 01/26/2022] [Indexed: 06/14/2023]
Abstract
Using the first-principles approach, we investigated the electronic and chemical properties of cupric oxide CuO (110) and CuO (111) and substantiated their catalytic activity toward CO oxidation. It is found that CuO (111) surface is more stable than the CuO (110) surface. We firstly study that adsorption of CO and O2on perfect, oxygen vacancies and Cu-anchored CuO (111) surface. It is found that adsorption of CO and O2molecules are chemical. Then we selected the most stable adsorption structure of CO/O2to investigated the CO oxidation mechanism on different surface, here we choose to study the Langmuir-Hinshelwood (LH) mechanism and Eley-Rideal (ER) mechanism. The results show that perfect and OvacancyCuO (111) surface is more inclined to LH mechanism, while the Cu-anchored CuO (111) surface is more inclined to ER mechanism. The results show that CuO catalyst is very effective for CO oxidation. Our work provides a deep understanding for the search of economical and reasonable CO oxidation catalysts.
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Affiliation(s)
- Long Lin
- Henan Key Laboratory of Materials on Deep-Earth Engineering, School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, People's Republic of China
- School of Mathematics and Informatics, Henan Polytechnic University, Jiaozuo 454000, People's Republic of China
| | - Pei Shi
- Henan Key Laboratory of Materials on Deep-Earth Engineering, School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, People's Republic of China
| | - Linwei Yao
- School of Information Science and Technology, Northwest University, Xi'an 710127, People's Republic of China
| | - Kun Xie
- Henan Key Laboratory of Materials on Deep-Earth Engineering, School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, People's Republic of China
| | - Hualong Tao
- Liaoning Key Materials Laboratory for Railway, School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning Province, People's Republic of China
| | - Zhanying Zhang
- Henan Key Laboratory of Materials on Deep-Earth Engineering, School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, People's Republic of China
| | - Yanfang Wang
- School of Mathematics and Informatics, Henan Polytechnic University, Jiaozuo 454000, People's Republic of China
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2
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Nishio H, Miura H, Kamata K, Shishido T. Deposition of highly dispersed gold nanoparticles onto metal phosphates by deposition–precipitation with aqueous ammonia. Catal Sci Technol 2021. [DOI: 10.1039/d1cy01627j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Deposition–precipitation with aqueous ammonia enabled small gold nanoparticles to be deposited onto a series of metal phosphates with high dispersity and density.
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Affiliation(s)
- Hidenori Nishio
- Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
| | - Hiroki Miura
- Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
- Research Center for Hydrogen Energy-based Society, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
- Elements Strategy Initiative for Catalysts & Batteries, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8520, Japan
| | - Keigo Kamata
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Nagatsuta-cho 4259, Midori-ku, Yokohama-city, Kanagawa, 226-8503, Japan
| | - Tetsuya Shishido
- Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
- Research Center for Hydrogen Energy-based Society, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
- Elements Strategy Initiative for Catalysts & Batteries, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8520, Japan
- Research Center for Gold Chemistry, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
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3
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Abstract
Gold catalysts have found applications in many reactions of both industrial and environmental importance. Great interest has been paid to the development of new processes that reduce energy consumption and minimize pollution. Among these reactions, the catalytic oxidation of carbon monoxide (CO) is an important one, considering that a high concentration of CO in the atmosphere creates serious health and environmental problems. This paper examines the most important achievements and conclusions arising from the own authorship contributions concerning (2 wt. % Au)/Ce1−xZrxO2 catalyst’s active sites in low-temperature CO oxidation. The main findings of the present review are: (1) The effect of preparing conditions on Au crystallite size, highlighting some of the fundamental underpinnings of gold catalysis: the Au surface composition and the poisoning effect of residual chloride on the catalytic activity of (2 wt. % Au)/Ce1−xZrxO2 catalysts in CO oxidation; (2) The identification of ion clusters related to gold and their effect on catalyst’ surface composition; (3) The importance of physicochemical properties of oxide support (e.g., its particle size, oxygen mobility at low temperature and redox properties) in the creation of catalytic performance of Au catalysts; (4) The importance of oxygen vacancies, on the support surface, as the centers for oxygen molecule activation in CO reaction; (5) The role of moisture (200–1000 ppm) in the generation of enhanced CO conversion; (6) The Au-assisted Mars-van Krevelen (MvK) adsorption–reaction model was pertinent to describe CO oxidation mechanism. The principal role of Au in CO oxidation over (2 wt. % Au)/Ce1−xZrxO2 catalysts was related to the promotion in the transformation process of reversibly adsorbed or inactive surface oxygen into irreversibly adsorbed active species; (7) Combination of metallic gold (Au0) and Au-OH species was proposed as active sites for CO adsorption. These findings can help in the optimization of Au-containing catalysts.
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Moon I, Lee S, Lee M, Kim C, Seol D, Kim Y, Kim KH, Yeom GY, Teherani JT, Hone J, Yoo WJ. The device level modulation of carrier transport in a 2D WSe 2 field effect transistor via a plasma treatment. NANOSCALE 2019; 11:17368-17375. [PMID: 31524214 DOI: 10.1039/c9nr05881h] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Tungsten diselenide (WSe2) has received significant attention because it shows the pristine ambipolar property arising from the Fermi level located near the midgap and can be converted to uni-polar form. In this study, we observe the formation of tungsten oxide (WOx) on the WSe2 surface after oxygen plasma treatment and show that the p-type WOx dopes WSe2. In our devices that underwent plasma treatment, it was interesting to find a strong correlation between the changes in the work function of WSe2 and a gold electrode, and the channel and contact resistances. The channel resistance changes very sensitively at a rate of 64 meV per dec with the increase in the WSe2 channel work function, which is close to the thermal limit; this indicates the defect-free oxidized WSe2 channel. The carrier transport in the oxidized WSe2 FET is shown to change to a high performance p-type device with greatly reduced channel and contact resistances with the increase in the plasma oxidation time.
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Affiliation(s)
- Inyong Moon
- SKKU Advanced Institute of Nano-Technology (SAINT), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Korea.
| | - Sungwon Lee
- SKKU Advanced Institute of Nano-Technology (SAINT), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Korea.
| | - Myeongjin Lee
- SKKU Advanced Institute of Nano-Technology (SAINT), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Korea.
| | - Changsik Kim
- SKKU Advanced Institute of Nano-Technology (SAINT), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Korea.
| | - Daehee Seol
- School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 16419 Korea
| | - Yunseok Kim
- School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 16419 Korea
| | - Ki Hyun Kim
- School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 16419 Korea
| | - Geun Young Yeom
- SKKU Advanced Institute of Nano-Technology (SAINT), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Korea. and School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 16419 Korea
| | - James T Teherani
- Department of Electrical Engineering, Columbia University, New York, NY 10027, USA
| | - James Hone
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA
| | - Won Jong Yoo
- SKKU Advanced Institute of Nano-Technology (SAINT), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Korea.
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5
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Rochard G, Giraudon JM, Liotta LF, La Parola V, Lamonier JF. Au/Co promoted CeO2 catalysts for formaldehyde total oxidation at ambient temperature: role of oxygen vacancies. Catal Sci Technol 2019. [DOI: 10.1039/c9cy00436j] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cobalt enables formation of additional oxygen vacancies in Au/Co–CeO2 and significantly boosts the ambient oxidation of formaldehyde.
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Affiliation(s)
- Guillaume Rochard
- Univ. Lille, CNRS, Centrale Lille, ENSCL
- Univ. Artois
- UMR 8181 – UCCS – Unité de Catalyse et Chimie du Solide
- F-59000 Lille
- France
| | - Jean-Marc Giraudon
- Univ. Lille, CNRS, Centrale Lille, ENSCL
- Univ. Artois
- UMR 8181 – UCCS – Unité de Catalyse et Chimie du Solide
- F-59000 Lille
- France
| | | | - Valeria La Parola
- Istituto per lo Studio dei Materiali Nanostrutturati ISMN-CNR
- 90146 Palermo
- Italy
| | - Jean-François Lamonier
- Univ. Lille, CNRS, Centrale Lille, ENSCL
- Univ. Artois
- UMR 8181 – UCCS – Unité de Catalyse et Chimie du Solide
- F-59000 Lille
- France
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6
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Klyushin AY, Jones TE, Lunkenbein T, Kube P, Li X, Hävecker M, Knop-Gericke A, Schlögl R. Strong Metal Support Interaction as a Key Factor of Au Activation in CO Oxidation. ChemCatChem 2018. [DOI: 10.1002/cctc.201800972] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Alexander Yu. Klyushin
- Department of Inorganic Chemistry; Fritz Haber Institute of the Max Planck Society; Faradayweg 4-6 Berlin 14195 Germany
- Division of Energy Material; Helmholtz-Zentrum Berlin für Materialien und Energie GmbH; Albert-Einstein-Str. 15 Berlin 12489 Germany
| | - Travis E. Jones
- Department of Inorganic Chemistry; Fritz Haber Institute of the Max Planck Society; Faradayweg 4-6 Berlin 14195 Germany
| | - Thomas Lunkenbein
- Department of Inorganic Chemistry; Fritz Haber Institute of the Max Planck Society; Faradayweg 4-6 Berlin 14195 Germany
| | - Pierre Kube
- Department of Inorganic Chemistry; Fritz Haber Institute of the Max Planck Society; Faradayweg 4-6 Berlin 14195 Germany
| | - Xuan Li
- Department of Inorganic Chemistry; Fritz Haber Institute of the Max Planck Society; Faradayweg 4-6 Berlin 14195 Germany
| | - Michael Hävecker
- Department of Heterogeneous Reactions; Max-Planck-Institute for Chemical Energy Conversion; Stiftstrasse 34-36 Mülheim an der Ruhr 45470 Germany
| | - Axel Knop-Gericke
- Department of Inorganic Chemistry; Fritz Haber Institute of the Max Planck Society; Faradayweg 4-6 Berlin 14195 Germany
| | - Robert Schlögl
- Department of Inorganic Chemistry; Fritz Haber Institute of the Max Planck Society; Faradayweg 4-6 Berlin 14195 Germany
- Division of Energy Material; Helmholtz-Zentrum Berlin für Materialien und Energie GmbH; Albert-Einstein-Str. 15 Berlin 12489 Germany
- Department of Heterogeneous Reactions; Max-Planck-Institute for Chemical Energy Conversion; Stiftstrasse 34-36 Mülheim an der Ruhr 45470 Germany
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7
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Zhang H, Zhu J, Zhang H, Zhang J, Zhang Y, Lu ZH. The structural, electronic and catalytic properties of Aun (n = 1–4) nanoclusters on monolayer MoS2. RSC Adv 2017. [DOI: 10.1039/c7ra07591j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The structural stability, electronic and catalytic properties of Aun (n = 1–4) nanoclusters supported on monolayer MoS2 have been investigated based on first principle DFT calculation with van der Waals (vdW) corrections.
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Affiliation(s)
- Hui Zhang
- College of Chemistry and Chemical Engineering
- Jiangxi Normal University
- Nanchang
- China
| | - Jia Zhu
- College of Chemistry and Chemical Engineering
- Jiangxi Normal University
- Nanchang
- China
| | - Hongge Zhang
- College of Chemistry and Chemical Engineering
- Jiangxi Normal University
- Nanchang
- China
| | - Jinyan Zhang
- College of Chemistry and Chemical Engineering
- Jiangxi Normal University
- Nanchang
- China
| | - Yongfan Zhang
- Department of Chemistry
- Fuzhou University
- Fuzhou
- China
- State Key Laboratory of Photocatalysis on Energy and Environment
| | - Zhang-Hui Lu
- College of Chemistry and Chemical Engineering
- Jiangxi Normal University
- Nanchang
- China
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8
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Widmann D, Behm RJ. Formation and removal of active oxygen species for the non-catalytic CO oxidation on Au/TiO 2 catalysts. CHINESE JOURNAL OF CATALYSIS 2016. [DOI: 10.1016/s1872-2067(16)62452-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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9
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Commercial Supported Gold Nanoparticles Catalyzed Alkyne Hydroamination and Indole Synthesis. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600804] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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10
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Zhang W, Zhao Q, Wang X, Yan X, Han S, Zeng Z. Highly active and stable Au@Cu xO core–shell nanoparticles supported on alumina for carbon monoxide oxidation at low temperature. RSC Adv 2016. [DOI: 10.1039/c6ra07358a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Au@CuxO core–shell nanoparticles and Au@CuxO/Al2O3used for CO oxidation at low temperature are prepared. CO conversion on Au@CuxO/Al2O3can reach to 38% at room temperature and the catalytic activity remains unchanged after 108 hours reaction.
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Affiliation(s)
- Weining Zhang
- Department of Chemistry
- College of Science
- Shanghai University
- Shanghai 200444
- China
| | - Qingguo Zhao
- Department of Chemistry
- College of Science
- Shanghai University
- Shanghai 200444
- China
| | - Xiaohong Wang
- Department of Chemistry
- College of Science
- Shanghai University
- Shanghai 200444
- China
| | - Xiaoxia Yan
- Department of Chemistry
- College of Science
- Shanghai University
- Shanghai 200444
- China
| | - Sheng Han
- New Energy Material Lab
- Shanghai Institute of Technology
- Shanghai 201418
- China
| | - Zhigang Zeng
- Department of Physics
- College of Science
- Shanghai University
- Shanghai 200444
- China
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11
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Wells PP, Crabb EM, King CR, Fiddy S, Amieiro-Fonseca A, Thompsett D, Russell AE. Reduction properties of Ce in CeOx/Pt/Al2O3 catalysts. ACTA ACUST UNITED AC 2015. [DOI: 10.1179/2055075815y.0000000001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Affiliation(s)
- P. P. Wells
- Department of ChemistryUniversity of Southampton, Highfield, Southampton SO17 1BJ, UK
- UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot OX11 0FA, UK
| | - E. M. Crabb
- Department of Life Health and Chemical Sciences, The Open University, Milton Keynes MK7 6AA, UK
| | - C. R. King
- Department of ChemistryUniversity of Southampton, Highfield, Southampton SO17 1BJ, UK
| | - S. Fiddy
- CCLRC Daresbury Laboratory, Warrington WA4 4AD, UK
| | - A. Amieiro-Fonseca
- Johnson Matthey Technologyb Centre, Blounts Court, Sonning Common, Reading RG4 9NH, UK
| | - D. Thompsett
- Johnson Matthey Technologyb Centre, Blounts Court, Sonning Common, Reading RG4 9NH, UK
| | - A. E. Russell
- Department of ChemistryUniversity of Southampton, Highfield, Southampton SO17 1BJ, UK
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12
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Tang W, Wu X, Chen Y. Catalytic removal of gaseous benzene over Pt/SBA-15 catalyst: the effect of the preparation method. REACTION KINETICS MECHANISMS AND CATALYSIS 2014. [DOI: 10.1007/s11144-014-0817-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Liang S, Jasinski J, Hammond GB, Xu B. Supported Gold Nanoparticle-Catalyzed Hydration of Alkynes under Basic Conditions. Org Lett 2014; 17:162-5. [DOI: 10.1021/ol5033859] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Shengzong Liang
- Department of Chemistry and ‡Institute for Advanced
Materials and Renewable Energy, University of Louisville, Louisville, Kentucky 40292, United States
| | - Jacek Jasinski
- Department of Chemistry and ‡Institute for Advanced
Materials and Renewable Energy, University of Louisville, Louisville, Kentucky 40292, United States
| | - Gerald B. Hammond
- Department of Chemistry and ‡Institute for Advanced
Materials and Renewable Energy, University of Louisville, Louisville, Kentucky 40292, United States
| | - Bo Xu
- Department of Chemistry and ‡Institute for Advanced
Materials and Renewable Energy, University of Louisville, Louisville, Kentucky 40292, United States
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14
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Mongin C, Pianet I, Jonusauskas G, Bassani DM, Bibal B. Supramolecular Photocatalyst for the Reduction of Au(III) to Au(I) and High-Turnover Generation of Gold Nanocrystals. ACS Catal 2014. [DOI: 10.1021/cs5016063] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Cédric Mongin
- Institut
des Sciences Moléculaires, CNRS UMR 5255, Université de Bordeaux, 351, cours de la Libération, 33405 Talence, France
| | - Isabelle Pianet
- Institut
des Sciences Moléculaires, CNRS UMR 5255, Université de Bordeaux, 351, cours de la Libération, 33405 Talence, France
| | - Gediminas Jonusauskas
- Laboratoire
Ondes et Matière d’Aquitaine, UMR CNRS 5798, Université de Bordeaux, 351, cours de la Libération, 33405 Talence, France
| | - Dario M. Bassani
- Institut
des Sciences Moléculaires, CNRS UMR 5255, Université de Bordeaux, 351, cours de la Libération, 33405 Talence, France
| | - Brigitte Bibal
- Institut
des Sciences Moléculaires, CNRS UMR 5255, Université de Bordeaux, 351, cours de la Libération, 33405 Talence, France
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15
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Vilhelmsen LB, Hammer B. Identification of the Catalytic Site at the Interface Perimeter of Au Clusters on Rutile TiO2(110). ACS Catal 2014. [DOI: 10.1021/cs500202f] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Lasse B. Vilhelmsen
- Interdisciplinary Nanoscience
Center (iNANO) and Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Bjørk Hammer
- Interdisciplinary Nanoscience
Center (iNANO) and Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
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16
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Vilhelmsen LB, Hammer B. Interfacial oxygen under TiO2 supported Au clusters revealed by a genetic algorithm search. J Chem Phys 2013; 139:204701. [DOI: 10.1063/1.4829640] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Bachmann M, Bikaljevic D, Memmel N, Bertel E. Adsorption and Reactions of Carbon Monoxide and Oxygen on Bare and Au-Decorated Carburized W(110). THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2013; 117:17024-17032. [PMID: 23991229 PMCID: PMC3753032 DOI: 10.1021/jp404528p] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Revised: 07/17/2013] [Indexed: 06/02/2023]
Abstract
Adsorption and coadsorption of carbon monoxide and oxygen on different types of Au clusters on R(15 × 3)C/W(110) and R(15 × 12)C/W(110), respectively, are studied with respect to the catalytic behavior for oxidation of CO as well as of surface carbon. Carburization of the W(110) surface results in a weakening of the adsorption bond for molecularly adsorbed CO. Dissociation of carbon monoxide, which occurs on W(110), is reduced on the low-carbon coverage R(15 × 12) surface and completely suppressed on the carbon-saturated R(15 × 3) phase. Deposition of gold results in a blocking of adsorption sites for molecularly adsorbed CO and reopening of the dissociation channel. Probably the latter is associated with the existence of double-layer gold clusters and islands. At room temperature the gold clusters on both carburized templates are stable in CO atmosphere as shown by in-situ STM measurements. In contrast, exposure to oxygen alters the clusters on the R(15 × 12) surface, implying dissociation of oxygen not only on the substrate but also on or in immediate vicinity of the gold clusters. On the Au-free carburized templates oxygen adsorbs dissociatively and is released as CO at temperatures beyond 800 K due to reaction with carbon atoms from the templates. Deposition of gold enhances the desorption rate of the formed CO at the low-temperature end of the recombinative CO desorption range, indicating a promoting effect of gold for oxidation of surface carbon. In contrast, low-temperature CO oxidation catalyzed by the deposited Au clusters is not observed. Two reasons could be identified: (1) weakly bound CO with desorption temperatures between 100 and 200 K (as reported for other related systems) is not observed, and (2) oxygen atoms are bonded too strongly to the templates.
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Affiliation(s)
- Magdalena Bachmann
- Institute of Physical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck,
Austria
| | - Djuro Bikaljevic
- Institute of Physical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck,
Austria
- Physics Department
E20, Technical University of Munich, James-Franck-Str.1,
D-85748 Garching, Germany
| | - Norbert Memmel
- Institute of Physical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck,
Austria
| | - Erminald Bertel
- Institute of Physical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck,
Austria
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18
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Lira E, Hansen JØ, Merte LR, Sprunger PT, Li Z, Besenbacher F, Wendt S. Growth of Ag and Au Nanoparticles on Reduced and Oxidized Rutile TiO2(110) Surfaces. Top Catal 2013. [DOI: 10.1007/s11244-013-0141-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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19
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Wang YG, Yoon Y, Glezakou VA, Li J, Rousseau R. The role of reducible oxide-metal cluster charge transfer in catalytic processes: new insights on the catalytic mechanism of CO oxidation on Au/TiO2 from ab initio molecular dynamics. J Am Chem Soc 2013; 135:10673-83. [PMID: 23782230 DOI: 10.1021/ja402063v] [Citation(s) in RCA: 186] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
To probe metal particle/reducible oxide interactions density functional theory based ab initio molecular dynamics studies were performed on a prototypical metal cluster (Au20) supported on reducible oxides (rutile TiO2(110)) to implicitly account for finite temperature effects and the role of excess surface charge in the metal oxide. It is found that the charge state of the Au particle is negative in a reducing chemical environment whereas in the presence of oxidizing species coadsorbed to the oxide surface the cluster obtained a net positive charge. In the context of the well-known CO oxidation reaction, charge transfer facilitates the plasticization of Au20, which allows for a strong adsorbate induced surface reconstruction upon addition of CO leading to the formation of mobile Au-CO species on the surface. The charging/discharging of the cluster during the catalytic cycle of CO oxidation enhances and controls the amount of O2 adsorbed at oxide/cluster interface and strongly influences the energetics of all redox steps in catalytic conversions. A detailed comparison of the current findings with previous studies is presented, and generalities about the role of surface-adsorbate charge transfer for metal cluster/reducible oxide interactions are discussed.
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Affiliation(s)
- Yang-Gang Wang
- Department of Chemistry, Tsinghua University, Beijing, 100084, China
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Shin K, Kim DH, Lee HM. Catalytic characteristics of AgCu bimetallic nanoparticles in the oxygen reduction reaction. CHEMSUSCHEM 2013; 6:1044-1049. [PMID: 23650210 DOI: 10.1002/cssc.201201001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2012] [Revised: 02/28/2013] [Indexed: 06/02/2023]
Abstract
Intensive research on oxygen reduction reaction (ORR) catalysts has been undertaken to find a Pt substitute or reduce the amount of Pt. Ag nanoparticles are potential Pt substitutes; however, the weak oxygen adsorption energy of Ag prompted investigation of other catalysts. Herein, we prepared AgCu bimetallic nanoparticle (NP) systems to improve the catalytic performance and compared the catalytic performance of Ag, Cu, AgCu (core-shell), and AgCu (alloy) NP systems as new catalyst by investigating the adsorption energy of oxygen and the activation energy of oxygen dissociation, which is known to be the rate-determining step of ORR. By analyzing HOMO-level isosurfaces of metal NPs and oxygen, we found that the adsorption sites and the oxygen adsorption energies varied with different configurations of NPs. We then plotted the oxygen adsorption energies against the energy barrier of oxygen dissociation to determine the catalytic performance. AgCu (alloy) and Cu NPs exhibited strong adsorption energies and low activation-energy barriers. However, the overly strong oxygen adsorption energy of Cu NPs hindered the ORR.
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Affiliation(s)
- Kihyun Shin
- Department of Materials Science & Engineering, Korea Advanced Institute of Science & Technology (KAIST), 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea
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21
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Stratakis M, Garcia H. Catalysis by supported gold nanoparticles: beyond aerobic oxidative processes. Chem Rev 2012; 112:4469-506. [PMID: 22690711 DOI: 10.1021/cr3000785] [Citation(s) in RCA: 546] [Impact Index Per Article: 45.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Manolis Stratakis
- Department of Chemistry, University of Crete, 71003 Voutes, Iraklion, Greece.
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22
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Kuang X, Wang X, Liu G. The adsorptions of silver-doped small gold clusters toward carbon monoxide molecule. Struct Chem 2011. [DOI: 10.1007/s11224-011-9912-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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23
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Dry photochemical synthesis of hydrotalcite, γ-Al2O3 and TiO2 supported gold nanoparticle catalysts. J Photochem Photobiol A Chem 2011. [DOI: 10.1016/j.jphotochem.2011.08.013] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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24
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Total CO oxidation over Fe-containing Au/HMS catalysts: Effects of gold loading and catalyst pretreatment. Catal Today 2011. [DOI: 10.1016/j.cattod.2011.02.067] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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25
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Beck A, Magesh G, Kuppan B, Schay Z, Geszti O, Benkó T, Viswanath R, Selvam P, Viswanathan B, Guczi L. Specific role of polymorphs of supporting titania in catalytic CO oxidation on gold. Catal Today 2011. [DOI: 10.1016/j.cattod.2010.12.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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26
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Wang S, Zhang M, Zhang W. Yolk−Shell Catalyst of Single Au Nanoparticle Encapsulated within Hollow Mesoporous Silica Microspheres. ACS Catal 2011. [DOI: 10.1021/cs1000762] [Citation(s) in RCA: 183] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shengnan Wang
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China
| | - Minchao Zhang
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China
| | - Wangqing Zhang
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China
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Do YJ, Choi JS, Kim SK, Sohn YK. The Interfacial Nature of TiO2and ZnO Nanoparticles Modified by Gold Nanoparticles. B KOREAN CHEM SOC 2010. [DOI: 10.5012/bkcs.2010.31.8.2170] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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28
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Veith G, Lupini A, Pennycook S, Dudney N. Influence of Support Hydroxides on the Catalytic Activity of Oxidized Gold Clusters. ChemCatChem 2010. [DOI: 10.1002/cctc.200900243] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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29
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Zhong CJ, Luo J, Fang B, Wanjala BN, Njoki PN, Loukrakpam R, Yin J. Nanostructured catalysts in fuel cells. NANOTECHNOLOGY 2010; 21:062001. [PMID: 20065536 DOI: 10.1088/0957-4484/21/6/062001] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
One of the most important challenges for the ultimate commercialization of fuel cells is the preparation of active, robust, and low-cost catalysts. This review highlights some findings of our investigations in the last few years in developing advanced approaches to nanostructured catalysts that address this challenge. Emphasis is placed on nanoengineering-based fabrication, processing, and characterization of multimetallic nanoparticles with controllable size (1-10 nm), shape, composition (e.g. Ml(n)M2(100-n), M1(n)M2(m)M3(100-n-m), M1@M2, where M (1 or 2) = Pt, Co, Ni, V, Fe, Cu, Pd, W, Ag, Au etc) and morphology (e.g. alloy, core@shell etc). In addition to an overview of the fundamental issues and the recent progress in fuel cell catalysts, results from evaluations of the electrocatalytic performance of nanoengineered catalysts in fuel cell reactions are discussed. This approach differs from other traditional approaches to the preparation of supported catalysts in the ability to control the particle size, composition, phase, and surface properties. An understanding of how the nanoscale properties of the multimetallic nanoparticles differ from their bulk-scale counterparts, and how the interaction between the nanoparticles and the support materials relates to the size sintering or evolution in the thermal activation process, is also discussed. The fact that the bimetallic gold-platinum nanoparticle system displays a single-phase character different from the miscibility gap known for its bulk-scale counterpart serves as an important indication of the nanoscale manipulation of the structural properties, which is useful for refining the design and preparation of the bimetallic catalysts. The insight gained from probing how nanoparticle-nanoparticle and nanoparticle-substrate interactions relate to the size evolution in the activation process of nanoparticles on planar substrates serves as an important guiding principle in the control of nanoparticle sintering on different support materials. The fact that some of the trimetallic nanoparticle catalysts (e.g. PtVFe or PtNiFe) exhibit electrocatalytic activities in fuel cell reactions which are four-five times higher than in pure Pt catalysts constitutes the basis for further exploration of a variety of multimetallic combinations. The fundamental insights into the control of nanoscale alloy, composition, and core-shell structures have important implications in identifying nanostructured fuel cell catalysts with an optimized balance of catalytic activity and stability.
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Affiliation(s)
- Chuan-Jian Zhong
- Department of Chemistry, State University of New York at Binghamton, Binghamton, NY 13902, USA.
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30
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Grams J. Surface studies of heterogeneous catalysts by time-of-flight secondary ion mass spectrometry. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2010; 16:453-461. [PMID: 20530830 DOI: 10.1255/ejms.1079] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The aim of this paper was to present potentialities of time-of-flight secondary ion mass spectrometry (ToF- SIMS) in the studies of heterogeneous catalysts. The results of ToF-SIMS investigations of Co/Al2O3, Mo/Al2O3, Co-Mo/Al2O3, Au/Al2O3, Pt/TiO2 and Pd/TiO2 systems were described. It was demonstrated that, in this case, an application of ToF-SIMS makes possible the determination of surface composition of investigated catalysts (including an identification of surface contaminants), characterization of interactions between an active phase and support, estimation of active phase dispersion on the analyzed surface, comparison of the degree of metal oxidation after treatment of the catalyst in different conditions, investigation of catalyst deactivation processes (formation of new chemical compounds, adsorption of various impurities and poisons on the catalyst surface) and determination of organic precursors of catalysts.
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Affiliation(s)
- Jacek Grams
- Institute of General and Ecological Chemistry, Technical University of Lodz, ul. Zeromskiego 116, Lodz, Poland.
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31
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Škoda M, Cabala M, Matolínová I, Prince KC, Skála T, Šutara F, Veltruská K, Matolín V. Interaction of Au with CeO2(111): A photoemission study. J Chem Phys 2009; 130:034703. [DOI: 10.1063/1.3046684] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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32
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Carbon Monoxide Oxidation over Au/Ce1−x Zr x O2 Catalysts: Effects of Moisture Content in the Reactant Gas and Catalyst Pretreatment. Catal Letters 2008. [DOI: 10.1007/s10562-008-9749-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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33
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Bagus PS, Pacchioni G. On the origin of bonding and vibrational frequency shifts for CO adsorbed on neutral, cationic and anionic gold clusters. ACTA ACUST UNITED AC 2008. [DOI: 10.1088/1742-6596/117/1/012003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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34
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Torres MB, Fernández EM, Balbás LC. Theoretical Study of Oxygen Adsorption on Pure Aun+1+ and Doped MAun+ Cationic Gold Clusters for M = Ti, Fe and n = 3−7. J Phys Chem A 2008; 112:6678-89. [PMID: 18578480 DOI: 10.1021/jp800247n] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- M. Begoña Torres
- Departamento de Matemáticas y Computación, Universidad de Burgos, E-09006 Burgos, Spain, Center for Atomic-Scale Material Design, Department of Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark, and Departamento de Física Teórica, Atómica y Óptica, Universidad de Valladolid, E-47011 Valladolid, Spain
| | - Eva M. Fernández
- Departamento de Matemáticas y Computación, Universidad de Burgos, E-09006 Burgos, Spain, Center for Atomic-Scale Material Design, Department of Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark, and Departamento de Física Teórica, Atómica y Óptica, Universidad de Valladolid, E-47011 Valladolid, Spain
| | - Luis C. Balbás
- Departamento de Matemáticas y Computación, Universidad de Burgos, E-09006 Burgos, Spain, Center for Atomic-Scale Material Design, Department of Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark, and Departamento de Física Teórica, Atómica y Óptica, Universidad de Valladolid, E-47011 Valladolid, Spain
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35
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Pacchioni G, Sicolo S, Valentin CD, Chiesa M, Giamello E. A Route toward the Generation of Thermally Stable Au Cluster Anions Supported on the MgO Surface. J Am Chem Soc 2008; 130:8690-5. [DOI: 10.1021/ja710969t] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gianfranco Pacchioni
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via R. Cozzi, 53 - 20125, Milano, Italy, and Dipartimento di Chimica IFM and NIS Centre of Excellence, Università di Torino, Via P. Giuria, 7 - 10125, Torino, Italy
| | - Sabrina Sicolo
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via R. Cozzi, 53 - 20125, Milano, Italy, and Dipartimento di Chimica IFM and NIS Centre of Excellence, Università di Torino, Via P. Giuria, 7 - 10125, Torino, Italy
| | - Cristiana Di Valentin
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via R. Cozzi, 53 - 20125, Milano, Italy, and Dipartimento di Chimica IFM and NIS Centre of Excellence, Università di Torino, Via P. Giuria, 7 - 10125, Torino, Italy
| | - Mario Chiesa
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via R. Cozzi, 53 - 20125, Milano, Italy, and Dipartimento di Chimica IFM and NIS Centre of Excellence, Università di Torino, Via P. Giuria, 7 - 10125, Torino, Italy
| | - Elio Giamello
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via R. Cozzi, 53 - 20125, Milano, Italy, and Dipartimento di Chimica IFM and NIS Centre of Excellence, Università di Torino, Via P. Giuria, 7 - 10125, Torino, Italy
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36
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Schwerdtfeger P, Lein M, Krawczyk RP, Jacob CR. The adsorption of CO on charged and neutral Au and Au2: A comparison between wave-function based and density functional theory. J Chem Phys 2008; 128:124302. [DOI: 10.1063/1.2834693] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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37
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Bürgel C, Reilly NM, Johnson GE, Mitrić R, Kimble ML, Castleman AW, Bonačić-Koutecký V. Influence of Charge State on the Mechanism of CO Oxidation on Gold Clusters. J Am Chem Soc 2008; 130:1694-8. [DOI: 10.1021/ja0768542] [Citation(s) in RCA: 133] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christian Bürgel
- Institut für Chemie, Humboldt Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin,
Germany, and Departments of Chemistry and Physics, The Pennsylvania State University,
University Park, Pennsylvania 16802
| | - Nelly M. Reilly
- Institut für Chemie, Humboldt Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin,
Germany, and Departments of Chemistry and Physics, The Pennsylvania State University,
University Park, Pennsylvania 16802
| | - Grant E. Johnson
- Institut für Chemie, Humboldt Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin,
Germany, and Departments of Chemistry and Physics, The Pennsylvania State University,
University Park, Pennsylvania 16802
| | - Roland Mitrić
- Institut für Chemie, Humboldt Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin,
Germany, and Departments of Chemistry and Physics, The Pennsylvania State University,
University Park, Pennsylvania 16802
| | - Michele L. Kimble
- Institut für Chemie, Humboldt Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin,
Germany, and Departments of Chemistry and Physics, The Pennsylvania State University,
University Park, Pennsylvania 16802
| | - A. W. Castleman
- Institut für Chemie, Humboldt Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin,
Germany, and Departments of Chemistry and Physics, The Pennsylvania State University,
University Park, Pennsylvania 16802
| | - Vlasta Bonačić-Koutecký
- Institut für Chemie, Humboldt Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin,
Germany, and Departments of Chemistry and Physics, The Pennsylvania State University,
University Park, Pennsylvania 16802
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38
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Freund HJ, Pacchioni G. Oxide ultra-thin films on metals: new materials for the design of supported metal catalysts. Chem Soc Rev 2008; 37:2224-42. [DOI: 10.1039/b718768h] [Citation(s) in RCA: 467] [Impact Index Per Article: 29.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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39
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An W, Pei Y, Zeng XC. CO oxidation catalyzed by single-walled helical gold nanotube. NANO LETTERS 2008; 8:195-202. [PMID: 18095733 DOI: 10.1021/nl072409t] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We study the catalytic capability of unsupported single-walled helical gold nanotubes Au(5,3) by using density functional theory. We use the CO oxidation as a benchmark probe to gain insights into high catalytic activity of the gold nanotubes. The CO oxidation, catalyzed by the Au(5,3) nanotube, proceeds via a two-step mechanism, CO + O2 --> CO2 +O and CO + O --> CO2. The CO oxidation is initiated by the CO + O2 --> OOCO --> CO2 + O reaction with an activation barrier of 0.29 eV. On the reaction path, a peroxo-type O-O-CO intermediate forms. Thereafter, the CO + O --> CO2 reaction proceeds along the reaction pathway with a very low barrier (0.03 eV). Note that the second reaction cannot be the starting point for the CO oxidation due to the energetically disfavored adsorption of free O2 on the gold nanotube. The high catalytic activity of the Au(5,3) nanotube can be attributed to the electronic resonance between electronic states of adsorbed intermediate species and Au atoms at the reaction site, particularly among the d states of Au atom and the antibonding 2pi* states of C-O and O1-O2, concomitant with a partial charge transfer. The presence of undercoordinated Au sites and the strain inherent in the helical gold nanotube also play important roles. Our study suggests that the CO oxidation catalyzed by the helical gold nanotubes is likely to occur at the room temperature.
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Affiliation(s)
- Wei An
- Department of Chemistry and Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, Nebraska 68588
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40
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41
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Wang JG, Hammer B. Role of Au(+) in supporting and activating Au(7) on TiO(2)(110). PHYSICAL REVIEW LETTERS 2006; 97:136107. [PMID: 17026054 DOI: 10.1103/physrevlett.97.136107] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2006] [Indexed: 05/03/2023]
Abstract
The adhesion properties and catalytic activity of rutile TiO(2)(110)-supported Au(7) nanoclusters in different oxidation states are investigated by means of density functional theory. The calculations cover both surface science conditions of reduced TiO(2) and real catalyst conditions of oxidized (alkaline) TiO(2) supports. Large adhesion energies of Au(7) are found only when modeling real catalysts where the cluster becomes cationic with Au(+) ions in Au-O or Au-OH bonds. The full catalytic cycle for oxidation of CO by O(2) over Au(7) on alkaline TiO(2)(110) is calculated and found to involve only small activation barriers. In the presence of the CO reductant, the Au(+) sites are capable of cycling between bonding of atomic and molecular oxygen. We confirm our findings by comparison of calculated and experimental infrared stretch frequency data for adsorbed CO.
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Affiliation(s)
- J G Wang
- Interdisciplinary Nanoscience Center (iNANO) and Department of Physics and Astronomy, University of Aarhus, DK 8000 Aarhus C, Denmark
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44
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Min BK, Alemozafar AR, Pinnaduwage D, Deng X, Friend CM. Efficient CO Oxidation at Low Temperature on Au(111). J Phys Chem B 2006; 110:19833-8. [PMID: 17020368 DOI: 10.1021/jp0616213] [Citation(s) in RCA: 127] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The rate of CO oxidation to CO2 depends strongly on the reaction temperature and characteristics of the oxygen overlayer on Au(111). The factors that contribute to the temperature dependence in the oxidation rate are (1) the residence time of CO on the surface, (2) the island size containing Au-O complexes, and (3) the local properties, including the degree of order of the oxygen layer. Three different types of oxygen--defined as chemisorbed oxygen, a surface oxide, and a bulk oxide--are identified and shown to have different reactivity. The relative populations of the various oxygen species depend on the preparation temperature and the oxygen coverage. The highest rate of CO oxidation was observed for an initial oxygen coverage of 0.5 monolayers that was deposited at 200 K where the density of chemisorbed oxygen is maximized. The rate decreases when two-dimensional islands of the surface oxide are populated and further decreases when three-dimensional bulk gold oxide forms. Our results are significant for designing catalytic processes that use Au for CO oxidation, because they suggest that the most efficient oxidation of CO occurs at low temperature--even below room temperature--as long as oxygen could be adsorbed on the surface.
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Affiliation(s)
- B K Min
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, USA
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Laursen S, Linic S. Oxidation catalysis by oxide-supported Au nanostructures: the role of supports and the effect of external conditions. PHYSICAL REVIEW LETTERS 2006; 97:026101. [PMID: 16907463 DOI: 10.1103/physrevlett.97.026101] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2006] [Indexed: 05/11/2023]
Abstract
Oxide-supported Au nanostructures are promising low-temperature oxidation catalysts. It is generally observed that Au supported on reducible oxides is more active than Au supported on irreducible oxides. Recent studies also suggest that cationic Au(delta+) is responsible for the unique Au/oxide catalytic activity, contrary to the conventional perception that oxide supports donate electronic charge to Au. We have utilized density functional calculations and ab initio thermodynamic studies to investigate the oxidation state of Au nanostructures deposited on reducible and irreducible supports. We find that there are fundamental differences in the electronic structure of Au deposited on the different oxides. We propose a simple model, grounded in the first principles calculations, which can explain the oxide-specific catalytic activity of Au nanostructures and which can account for the presence and the role of cationic Au(delta+).
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Affiliation(s)
- Siris Laursen
- Department of Chemical Engineering, University of Michigan, Ann Arbor, 48109-2136, USA
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Fernandez EM, Balbas LC. Theoretical Study of CO Adsorption on Gold/Alumina Substrates. J Phys Chem B 2006; 110:10449-54. [PMID: 16722752 DOI: 10.1021/jp060426l] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Aiming to understand the role of the substrate in the adsorption of carbon monoxide on gold clusters supported on metal-oxides, we have started a study of that process on two different alumina substrates: an amorphous-like fully relaxed stoichiometric (Al2O3)20 cluster and the Al terminated (0001) surface of alpha-(Al2O3) crystal. In this paper, we present first principles calculations for the adsorption of one Au atom on both alumina substrate and the adsorption of Au8 on (Al2O3)20. Then, we study the CO adsorption on the minimum energy structure of these three different gold/alumina systems. A single Au adsorbs preferably on top of an Al atom with low coordination, the binding energy being higher in the case of Au/(Al2O3)20. CO absorbs preferably on top of the Au atom, but in the case of Au/(Al2O3)20, Au forms a bridge with the Al and O substrate atoms after CO adsorption. We find other stable sites for CO adsorption on the cluster but not on the surface. This result suggests that the Au activity toward CO may be larger for the amorphous cluster than for the crystal surface substrate. For the most stable Au8/(Al2O3)20 configuration, two Au atoms bind to Al and a O atoms respectively and CO adsorbs on top of the Au which binds to the Al atom. We find other CO adsorption sites on supported Au8 which are not stable for the free Au8 cluster.
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Affiliation(s)
- Eva M Fernandez
- Departamento de Física Teórica, Atómica y Optica, Universidad de Valladolid, E-47011 Valladolid, Spain.
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Luo J, Njoki PN, Lin Y, Wang L, Zhong CJ. Activity-composition correlation of AuPt alloy nanoparticle catalysts in electrocatalytic reduction of oxygen. Electrochem commun 2006. [DOI: 10.1016/j.elecom.2006.02.001] [Citation(s) in RCA: 177] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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49
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Casaletto MP, Longo A, Martorana A, Prestianni A, Venezia AM. XPS study of supported gold catalysts: the role of Au0 and Au+δ species as active sites. SURF INTERFACE ANAL 2006. [DOI: 10.1002/sia.2180] [Citation(s) in RCA: 385] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Comotti M, Li WC, Spliethoff B, Schüth F. Support Effect in High Activity Gold Catalysts for CO Oxidation. J Am Chem Soc 2005; 128:917-24. [PMID: 16417382 DOI: 10.1021/ja0561441] [Citation(s) in RCA: 411] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this work, we present a detailed study concerning the evaluation of the metal-support interaction in high activity gold catalysts for CO oxidation. Using the colloidal deposition method, model catalysts were prepared, which allow the isolation of the effect of the support on the catalytic activity. Prefabricated gold particles were thus deposited on different support materials. Since the deposition process did not change the particle sizes of the gold particles, only the influence of the support could be studied. TiO2, Al2O3, ZrO2, and ZnO were used as support materials. Catalytic tests and high resolution transmission electron microscopy clearly show that the support contributes to the activity. However, our results are not in line with the distinction between active and passive supports based on the semiconducting properties of the oxidic material. The most active catalysts were obtained with TiO2 and Al2O3, while ZnO and ZrO2 gave substantially less active catalysts. Furthermore, the effect of other important parameters on the catalytic activity (i.e., particles size distribution, calcination temperature, and aging time for a Au/TiO2 catalyst) has also been studied. Using this preparation route, the catalysts show high-temperature stability, size dependent activity, and a very good long-term stability.
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Affiliation(s)
- Massimiliano Comotti
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim a.d. Ruhr, Germany
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