1
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Long Y, Wang X, Zhang H, Wang K, Ong WL, Bogaerts A, Li K, Lu C, Li X, Yan J, Tu X, Zhang H. Plasma Chemical Looping: Unlocking High-Efficiency CO 2 Conversion to Clean CO at Mild Temperatures. JACS AU 2024; 4:2462-2473. [PMID: 39055137 PMCID: PMC11267539 DOI: 10.1021/jacsau.4c00153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 04/15/2024] [Accepted: 04/25/2024] [Indexed: 07/27/2024]
Abstract
We propose a plasma chemical looping CO2 splitting (PCLCS) approach that enables highly efficient CO2 conversion into O2-free CO at mild temperatures. PCLCS achieves an impressive 84% CO2 conversion and a 1.3 mmol g-1 CO yield, with no O2 detected. Crucially, this strategy significantly lowers the temperature required for conventional chemical looping processes from 650 to 1000 °C to only 320 °C, demonstrating a robust synergy between plasma and the Ce0.7Zr0.3O2 oxygen carrier (OC). Systematic experiments and density functional theory (DFT) calculations unveil the pivotal role of plasma in activating and partially decomposing CO2, yielding a mixture of CO, O2/O, and electronically/vibrationally excited CO2*. Notably, these excited CO2* species then efficiently decompose over the oxygen vacancies of the OCs, with a substantially reduced activation barrier (0.86 eV) compared to ground-state CO2 (1.63 eV), contributing to the synergy. This work offers a promising and energy-efficient pathway for producing O2-free CO from inert CO2 through the tailored interplay of plasma and OCs.
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Affiliation(s)
- Yanhui Long
- State
Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
- College
of Energy Engineering, ZJU-UIUC, Zhejiang
University, Hangzhou 310027, China
| | - Xingzi Wang
- School
of Mechanical Engineering, Shanghai Jiao
Tong University, Shanghai 200240, China
| | - Hai Zhang
- School
of Mechanical Engineering, Shanghai Jiao
Tong University, Shanghai 200240, China
| | - Kaiyi Wang
- State
Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Wee-Liat Ong
- College
of Energy Engineering, ZJU-UIUC, Zhejiang
University, Hangzhou 310027, China
| | - Annemie Bogaerts
- Research
Group PLASMANT, Department of Chemistry, University of Antwerp, Universiteitsplein 1, Antwerp 2610, Belgium
| | - Kongzhai Li
- State
Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China
| | - Chunqiang Lu
- Department
of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3GJ, U.K.
| | - Xiaodong Li
- State
Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Jianhua Yan
- State
Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
- Ningbo
Innovation Center, Zhejiang University, Ningbo 315100, China
| | - Xin Tu
- Department
of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3GJ, U.K.
| | - Hao Zhang
- State
Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
- Ningbo
Innovation Center, Zhejiang University, Ningbo 315100, China
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2
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Meng X, Möller J, Menchón RE, Weismann A, Sánchez-Portal D, Garcia-Lekue A, Herges R, Berndt R. Kondo Effect of Co-Porphyrin: Remarkable Sensitivity to Adsorption Sites and Orientations. NANO LETTERS 2024; 24:180-186. [PMID: 38150551 DOI: 10.1021/acs.nanolett.3c03669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2023]
Abstract
We investigated the Kondo effect of cobalt(II)-5-15-bis(4'-bromophenyl)-10,20-bis(4'-iodophenyl)porphyrin (CoTPPBr2I2) molecules on Au(111) with low-temperature scanning tunneling microscopy under ultrahigh vacuum conditions. The molecules exhibit four adsorption configurations at the top and bridge sites of the surface with different molecular orientations. The Kondo resonance shows extraordinary sensitivity to the adsorption configuration. By switching the molecule between different configurations, the Kondo temperature is varied over a wide range from ≈8 up to ≈250 K. Density functional theory calculations reveal that changes of the adsorption configuration lead to distinct variations of the hybridization between the molecule and the surface. Furthermore, we show that surface reconstruction plays a significant role for the molecular Kondo effect.
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Affiliation(s)
- Xiangzhi Meng
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, 24098 Kiel, Germany
| | - Jenny Möller
- Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität, 24098 Kiel, Germany
| | - Rodrigo E Menchón
- Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastián, Spain
- Facultad de Ciencias Exactas, Ingeniría y Agrimensura (FCEIA), Instituto de Física Rosario (IFIR), 2000 Rosario, Argentina
- Universidad Nacional de Rosario (UNR), 2000 Rosario, Argentina
| | - Alexander Weismann
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, 24098 Kiel, Germany
| | - Daniel Sánchez-Portal
- Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastián, Spain
- Centro de Física de Materiales CSIC-UPV/EHU, 20018 Donostia-San Sebastián, Spain
| | - Aran Garcia-Lekue
- Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastián, Spain
- Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain
| | - Rainer Herges
- Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität, 24098 Kiel, Germany
| | - Richard Berndt
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, 24098 Kiel, Germany
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3
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Zhang J, Cao Y, Ding F, Zheng L, Ma Y, Cai Z, Zhou L, Huang K, Jiang L. Few-Layered Hexagonal Boron Nitrides as Highly Effective and Stable Solid Adsorbents for Ammonia Separation. Ind Eng Chem Res 2023. [DOI: 10.1021/acs.iecr.2c04174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Affiliation(s)
- Jiayin Zhang
- National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, 523 Gongye Rd, Fuzhou, Fujian 350002, China
| | - Yanning Cao
- National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, 523 Gongye Rd, Fuzhou, Fujian 350002, China
- Qingyuan Innovation Laboratory, 1 Xueyuan Rd, Quanzhou, Fujian 362801, China
| | - Fengyun Ding
- Institute of Materials, China Academy of Engineering Physics, 64 Mianshan Rd, Mianyang, Sichuan 621908, China
| | - Lu Zheng
- National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, 523 Gongye Rd, Fuzhou, Fujian 350002, China
| | - Yongde Ma
- National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, 523 Gongye Rd, Fuzhou, Fujian 350002, China
| | - Zhenping Cai
- National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, 523 Gongye Rd, Fuzhou, Fujian 350002, China
| | - Linsen Zhou
- Institute of Materials, China Academy of Engineering Physics, 64 Mianshan Rd, Mianyang, Sichuan 621908, China
| | - Kuan Huang
- National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, 523 Gongye Rd, Fuzhou, Fujian 350002, China
- Qingyuan Innovation Laboratory, 1 Xueyuan Rd, Quanzhou, Fujian 362801, China
| | - Lilong Jiang
- National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, 523 Gongye Rd, Fuzhou, Fujian 350002, China
- Qingyuan Innovation Laboratory, 1 Xueyuan Rd, Quanzhou, Fujian 362801, China
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4
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Morrison AT, Ramdin M, van der Broeke LJP, de Jong W, Vlugt TJH, Kortlever R. Surface Coverage as an Important Parameter for Predicting Selectivity Trends in Electrochemical CO 2 Reduction. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2022; 126:11927-11936. [PMID: 35928239 PMCID: PMC9340765 DOI: 10.1021/acs.jpcc.2c00520] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 06/24/2022] [Indexed: 06/15/2023]
Abstract
The electrochemical CO2 reduction reaction (CO2RR) is important for a sustainable future. Key insights into the reaction pathways have been obtained by density functional theory (DFT) analysis, but so far, DFT has been unable to give an overall understanding of selectivity trends without important caveats. We show that an unconsidered parameter in DFT models of electrocatalysts-the surface coverage of reacting species-is crucial for understanding the CO2RR selectivities for different surfaces. Surface coverage is a parameter that must be assumed in most DFT studies of CO2RR electrocatalysts, but so far, only the coverage of nonreacting adsorbates has been treated. Explicitly treating the surface coverage of reacting adsorbates allows for an investigation that can more closely mimic operating conditions. Furthermore, and of more immediate importance, the use of surface coverage-dependent adsorption energies allows for the extraction of ratios of adsorption energies of CO2RR intermediates (COOHads and HCOOads) that are shown to be predictive of selectivity and are not susceptible to systematic errors. This approach allows for categorization of the selectivity of several monometallic catalysts (Pt, Pd, Au, Ag, Zn, Cu, Rh, W, Pb, Sn, In, Cd, and Tl), even problematic ones such as Ag or Zn, and does so by only considering the adsorption energies of known intermediates. The selectivity of the further reduction of COOHads can now be explained by a preference for Tafel or Heyrovsky reactions, recontextualizing the nature of selectivity of some catalysts. In summary, this work resolves differences between DFT and experimental studies of the CO2RR and underlines the importance of surface coverage.
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Affiliation(s)
- Andrew
R. T. Morrison
- Large-Scale
Energy Storage, Process & Energy Department, Faculty of Mechanical,
Maritime and Materials Engineering, Delft
University of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
| | - Mahinder Ramdin
- Large-Scale
Energy Storage, Process & Energy Department, Faculty of Mechanical,
Maritime and Materials Engineering, Delft
University of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
- Engineering
Thermodynamics, Process & Energy Department, Faculty of Mechanical,
Maritime and Materials Engineering, Delft
University of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
| | - Leo J. P. van der Broeke
- Engineering
Thermodynamics, Process & Energy Department, Faculty of Mechanical,
Maritime and Materials Engineering, Delft
University of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
| | - Wiebren de Jong
- Large-Scale
Energy Storage, Process & Energy Department, Faculty of Mechanical,
Maritime and Materials Engineering, Delft
University of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
| | - Thijs J. H. Vlugt
- Engineering
Thermodynamics, Process & Energy Department, Faculty of Mechanical,
Maritime and Materials Engineering, Delft
University of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
| | - Ruud Kortlever
- Large-Scale
Energy Storage, Process & Energy Department, Faculty of Mechanical,
Maritime and Materials Engineering, Delft
University of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands
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5
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Pineda M, Stamatakis M. Kinetic Monte Carlo simulations for heterogeneous catalysis: Fundamentals, current status, and challenges. J Chem Phys 2022; 156:120902. [DOI: 10.1063/5.0083251] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Kinetic Monte Carlo (KMC) simulations in combination with first-principles (1p)-based calculations are rapidly becoming the gold-standard computational framework for bridging the gap between the wide range of length scales and time scales over which heterogeneous catalysis unfolds. 1p-KMC simulations provide accurate insights into reactions over surfaces, a vital step toward the rational design of novel catalysts. In this Perspective, we briefly outline basic principles, computational challenges, successful applications, as well as future directions and opportunities of this promising and ever more popular kinetic modeling approach.
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Affiliation(s)
- M. Pineda
- Thomas Young Centre and Department of Chemical Engineering, University College London, Roberts Building, Torrington Place, London WC1E 7JE, United Kingdom
| | - M. Stamatakis
- Thomas Young Centre and Department of Chemical Engineering, University College London, Roberts Building, Torrington Place, London WC1E 7JE, United Kingdom
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6
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Chen X, Zhou Q, Wang J, Chen Q. Formation of Graphene Nanoscrolls and Their Electronic Structures Based on Ab Initio Calculations. J Phys Chem Lett 2022; 13:2500-2506. [PMID: 35274956 DOI: 10.1021/acs.jpclett.2c00387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Rolling up two-dimensional (2D) materials can form quasi-one-dimensional nanoscrolls, which are expected to have novel properties due to their larger space of structural parameters. In this Letter, the structural dependence of formation energy was investigated based on more than 90 different graphene nanoscrolls (GNSs) through ab initio calculations. A quantified relationship between formation energy and structural parameters is discovered, which could provide universal description of rolling up 2D materials beyond graphene. Further calculations on electronic structures show the opening of bandgap in GNSs with ultrahigh carrier mobilities up to 107 cm2 V-1 s-1. The structural stability under room temperature was also testified by using molecular dynamic simulations. This work provides general insights into the rolling-up strategy and demonstrates the tunable properties of GNSs, thus extending the scope of the research field for 2D materials.
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Affiliation(s)
- Xinyu Chen
- School of Physics, Southeast University, Nanjing 211189, China
| | - Qionghua Zhou
- School of Physics, Southeast University, Nanjing 211189, China
| | - Jinlan Wang
- School of Physics, Southeast University, Nanjing 211189, China
| | - Qian Chen
- School of Physics, Southeast University, Nanjing 211189, China
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7
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Cao Y, Chen H, Shen Y, Chen M, Zhang Y, Zhang L, Wang Q, Guo S, Yang H. SnS 2 Nanosheets Anchored on Nitrogen and Sulfur Co-Doped MXene Sheets for High-Performance Potassium-Ion Batteries. ACS APPLIED MATERIALS & INTERFACES 2021; 13:17668-17676. [PMID: 33830722 DOI: 10.1021/acsami.1c02590] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Potassium-ion batteries (KIBs) are emerging as the prospective alternatives to lithium-ion batteries in energy storage systems owing to the sufficient resources and relatively low cost of K-related materials. However, serious volume expansion and low specific capacity are found in most materials systems resulting from the large intrinsic radius of K+. Herein, SnS2 nanosheets anchored on nitrogen and sulfur co-doped MXene (SnS2 NSs/MXene) are creatively designed as advanced anode materials for KIBs. SnS2 NSs/MXene with a unique hierarchical structure can not only provide fast transmission channels for K+ but also avoid the accumulation of K+ and volume expansion. These novel features make SnS2 NSs/MXene electrodes exhibit a superior reversible specific capacity of 342.4 mA h g-1 under 50 mA g-1. Also, they maintain 206.1 mA h g-1 at an even higher current density of 0.5 A g-1 over 800 cycles almost without capacity decay. Moreover, the multistep alloying reaction mechanism of SnS2 NSs/MXene composites and K+ is revealed by the ex situ X-ray diffraction measurement. In addition, the density functional theory calculations confirm the existence of Ti-S bonds between SnS2 nanosheets and MXene, which significantly enhance the structural stability and cycling electrochemical performance of SnS2 NSs/MXene composites.
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Affiliation(s)
- Yaping Cao
- Beijing Advanced Innovation Center for Materials Genome Engineering & Department of Materials Science and Engineering College of Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Hui Chen
- Beijing Advanced Innovation Center for Materials Genome Engineering & Department of Materials Science and Engineering College of Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Yupeng Shen
- Beijing Advanced Innovation Center for Materials Genome Engineering & Department of Materials Science and Engineering College of Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Mei Chen
- School of Advanced Materials, Shenzhen Graduate School, Peking University, Shenzhen 518055, People's Republic of China
| | - Yelong Zhang
- School of Applied Physics and Materials, Wuyi University, Jiangmen, Guangdong 529000, People's Republic of China
| | - Lanying Zhang
- Beijing Advanced Innovation Center for Materials Genome Engineering & Department of Materials Science and Engineering College of Engineering, Peking University, Beijing 100871, People's Republic of China
- Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing 100871, People's Republic of China
| | - Qian Wang
- Beijing Advanced Innovation Center for Materials Genome Engineering & Department of Materials Science and Engineering College of Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Shaojun Guo
- Beijing Advanced Innovation Center for Materials Genome Engineering & Department of Materials Science and Engineering College of Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Huai Yang
- Beijing Advanced Innovation Center for Materials Genome Engineering & Department of Materials Science and Engineering College of Engineering, Peking University, Beijing 100871, People's Republic of China
- Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing 100871, People's Republic of China
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8
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Weng Y, Vekeman J, Zhang H, Chou L, Elskens M, Tielens F. Unravelling phosphate adsorption on hydrous ferric oxide surfaces at the molecular level. CHEMOSPHERE 2020; 261:127776. [PMID: 32736248 DOI: 10.1016/j.chemosphere.2020.127776] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 07/09/2020] [Accepted: 07/19/2020] [Indexed: 06/11/2023]
Abstract
The thorough understanding of the adsorption mechanism of phosphate on hydrous ferric oxides is necessary to deal with the environmental issues related to high phosphate concentrations in soils and open water. In this work, we consider three different adsorption geometries (monodentate and bidentate chemisorption and physisorption) and calculate the adsorption geometries and related adsorption energies at optPBE-vdW level. Using the Maxwell-Boltzmann distribution, it is estimated that about 83% of the phosphate molecules is in a monodentate chemisorption configuration, while 17% is physisorbed. Furthermore, theoretical infra-red spectra are obtained and compared to equivalent experimental spectra, supporting the conclusion that mainly monodentate chemisorption and physisorption occur. Most interestingly, a weighed infra-red spectrum is then calculated, using the weights from the Maxwell-Boltzmann distribution, showing a very good comparison with the experimental spectra.
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Affiliation(s)
- Yuanting Weng
- General Chemistry (ALGC), Materials Modelling Group, Vrije Universiteit Brussel, Pleinlaan 2, 1050, Brussel, Belgium; Laboratory of Analytical, Environmental and Geo-Chemistry (AMGC), Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussel, Belgium
| | - Jelle Vekeman
- General Chemistry (ALGC), Materials Modelling Group, Vrije Universiteit Brussel, Pleinlaan 2, 1050, Brussel, Belgium
| | - Hailong Zhang
- Laboratory of Analytical, Environmental and Geo-Chemistry (AMGC), Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussel, Belgium; Service de Biogeochimie et Modélisation du Système Terre, Université Libre de Bruxelles, Campus de la Plaine - CP208, Boulevard du Triomphe, 1050, Brussel, Belgium
| | - Lei Chou
- Service de Biogeochimie et Modélisation du Système Terre, Université Libre de Bruxelles, Campus de la Plaine - CP208, Boulevard du Triomphe, 1050, Brussel, Belgium
| | - Marc Elskens
- Laboratory of Analytical, Environmental and Geo-Chemistry (AMGC), Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussel, Belgium
| | - Frederik Tielens
- General Chemistry (ALGC), Materials Modelling Group, Vrije Universiteit Brussel, Pleinlaan 2, 1050, Brussel, Belgium.
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9
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Exploring dynamic interactions of single nanoparticles at interfaces for surface-confined electrochemical behavior and size measurement. Nat Commun 2020; 11:2307. [PMID: 32385284 PMCID: PMC7210955 DOI: 10.1038/s41467-020-16149-0] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2019] [Accepted: 04/10/2020] [Indexed: 12/12/2022] Open
Abstract
With the development of new instruments and methodologies, the highly dynamic behaviors of nanoparticle at the liquid-solid interface have been studied. However, the dynamic nature of the electrochemical behavior of individual nanoparticles on the electrode interface is still poorly understood. Here, we generalize scaling relations to predict nanoparticle-electrode interactions by examining the adsorption energy of nanoparticles at an ultramicroelectrode interface. Based on the theoretical predictions, we investigate the interaction-modulated dynamic electrochemical behaviors for the oxidation of individual Ag nanoparticles. Typically, significantly distinct current traces are observed owing to the adsorption-mediated motion of Ag nanoparticles. Inspired by restraining the stochastic paths of particles in the vicinity of the electrode interface to produce surface-confined current traces, we successfully realize high-resolution size measurements of Ag nanoparticles in mixed-sample systems. This work offers a better understanding of dynamic interactions of nanoparticles at the electrochemical interface and displays highly valuable applications of single-entity electrochemistry. Single-entity electrochemistry has been proposed for studying properties of single nanoparticles (NPs). Here, the authors make use of adsorption-mediated motion of Ag NPs to take individual NP size measurements using electrochemical impacts with excellent agreement to standard imaging techniques.
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10
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Zhao N, Tian Y, Zhang L, Cheng Q, Lyu S, Ding T, Hu Z, Ma X, Li X. Spacial hindrance induced recovery of over-poisoned active acid sites in pyridine-modified H-mordenite for dimethyl ether carbonylation. CHINESE JOURNAL OF CATALYSIS 2019. [DOI: 10.1016/s1872-2067(19)63335-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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11
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Wang Y, Jiang C, Chen Q, Zhou Q, Wang H, Wan J, Ma L, Wang J. Highly Promoted Carrier Mobility and Intrinsic Stability by Rolling Up Monolayer Black Phosphorus into Nanoscrolls. J Phys Chem Lett 2018; 9:6847-6852. [PMID: 30449107 DOI: 10.1021/acs.jpclett.8b02913] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Rolling up two-dimensional (2D) materials into nanoscrolls could not only retain the excellent properties of their 2D hosts but also display intriguing physical and chemical properties that arise from their 1D tubular structures. Here, we report a new class of black phosphorus nanoscrolls (bPNSs), which are stable at room-temperature and energetically more favorable than 2D bP. Most strikingly, these bPNSs hold tunable direct band gaps and extremely high mobilities (e.g., the mobility of the double-layer bPNS is about 20-fold higher than that of 2D bP monolayer). Their unique self-encapsulation structure and layer-dependent conduction band minimum can largely prevent the entrance of O2 and the production of O2- and thereby suppress the possible environmental degradation as well. The enhanced intrinsic stability and promoted electronic properties render bPNSs great promise in many advanced electronics or optoelectronics applications.
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Affiliation(s)
- Yitian Wang
- School of Physics , Southeast University , Nanjing 211189 , China
| | - Chenghuan Jiang
- School of Physics , Nanjing University , Nanjing 210093 , China
| | - Qian Chen
- School of Physics , Southeast University , Nanjing 211189 , China
| | - Qionghua Zhou
- School of Physics , Southeast University , Nanjing 211189 , China
| | - Haowei Wang
- Mechanical Engineering Department , California State University Fullerton , Fullerton , California 92831 , United States
| | - Jianguo Wan
- School of Physics , Nanjing University , Nanjing 210093 , China
| | - Liang Ma
- School of Physics , Southeast University , Nanjing 211189 , China
| | - Jinlan Wang
- School of Physics , Southeast University , Nanjing 211189 , China
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12
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Salvarezza R, Carro P. The electrochemical stability of thiols on gold surfaces. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.10.046] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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13
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Kyhl L, Bisson R, Balog R, Groves MN, Kolsbjerg EL, Cassidy AM, Jørgensen JH, Halkjær S, Miwa JA, Grubišić Čabo A, Angot T, Hofmann P, Arman MA, Urpelainen S, Lacovig P, Bignardi L, Bluhm H, Knudsen J, Hammer B, Hornekaer L. Exciting H 2 Molecules for Graphene Functionalization. ACS NANO 2018; 12:513-520. [PMID: 29253339 PMCID: PMC7311079 DOI: 10.1021/acsnano.7b07079] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Hydrogen functionalization of graphene by exposure to vibrationally excited H2 molecules is investigated by combined scanning tunneling microscopy, high-resolution electron energy loss spectroscopy, X-ray photoelectron spectroscopy measurements, and density functional theory calculations. The measurements reveal that vibrationally excited H2 molecules dissociatively adsorb on graphene on Ir(111) resulting in nanopatterned hydrogen functionalization structures. Calculations demonstrate that the presence of the Ir surface below the graphene lowers the H2 dissociative adsorption barrier and allows for the adsorption reaction at energies well below the dissociation threshold of the H-H bond. The first reacting H2 molecule must contain considerable vibrational energy to overcome the dissociative adsorption barrier. However, this initial adsorption further activates the surface resulting in reduced barriers for dissociative adsorption of subsequent H2 molecules. This enables functionalization by H2 molecules with lower vibrational energy, yielding an avalanche effect for the hydrogenation reaction. These results provide an example of a catalytically active graphene-coated surface and additionally set the stage for a re-interpretation of previous experimental work involving elevated H2 background gas pressures in the presence of hot filaments.
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Affiliation(s)
- Line Kyhl
- iNANO, Aarhus University , DK-8000 Aarhus C, Denmark
| | - Régis Bisson
- Aix-Marseille University, CNRS, PIIM , 13007 Marseille, France
| | - Richard Balog
- Department of Physics and Astronomy, Aarhus University , DK-8000 Aarhus C, Denmark
| | - Michael N Groves
- Department of Physics and Astronomy, Aarhus University , DK-8000 Aarhus C, Denmark
| | | | | | | | - Susanne Halkjær
- Department of Physics and Astronomy, Aarhus University , DK-8000 Aarhus C, Denmark
| | - Jill A Miwa
- iNANO, Aarhus University , DK-8000 Aarhus C, Denmark
- Department of Physics and Astronomy, Aarhus University , DK-8000 Aarhus C, Denmark
| | | | - Thierry Angot
- Aix-Marseille University, CNRS, PIIM , 13007 Marseille, France
| | - Philip Hofmann
- Department of Physics and Astronomy, Aarhus University , DK-8000 Aarhus C, Denmark
| | | | | | - Paolo Lacovig
- Elettra-Sincrotrone Trieste S.C.p.A. , S. S. 14 km 163.5, 34012 Trieste, Italy
| | - Luca Bignardi
- Elettra-Sincrotrone Trieste S.C.p.A. , S. S. 14 km 163.5, 34012 Trieste, Italy
| | - Hendrik Bluhm
- Chemical Sciences Division and Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
| | - Jan Knudsen
- The MAX IV Laboratory, Lund University , 221 00 Lund, Sweden
- Division of Synchrotron Radiation Research, Lund University , 221 00 Lund, Sweden
| | - Bjørk Hammer
- iNANO, Aarhus University , DK-8000 Aarhus C, Denmark
- Department of Physics and Astronomy, Aarhus University , DK-8000 Aarhus C, Denmark
| | - Liv Hornekaer
- iNANO, Aarhus University , DK-8000 Aarhus C, Denmark
- Department of Physics and Astronomy, Aarhus University , DK-8000 Aarhus C, Denmark
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14
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Guo L, Ma L, Zhang Y, Cheng X, Xu Y, Wang J, Wang E, Peng Z. Spectroscopic Identification of the Au-C Bond Formation upon Electroreduction of an Aryl Diazonium Salt on Gold. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:11514-11519. [PMID: 27744705 DOI: 10.1021/acs.langmuir.6b03206] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Electroreduction of aryl diazonium salts on gold can produce organic films that are more robust than their analogous self-assembled monolayers formed from chemical adsorption of organic thiols on gold. However, whether the enhanced stability is due to the Au-C bond formation remains debated. In this work, we report the electroreduction of an aryl diazonium salt of 4,4'-disulfanediyldibenzenediazonium on gold forming a multilayer of Au-(Ar-S-S-Ar)n, which can be further degraded to a monolayer of Au-Ar-S- by electrochemical cleavage of the S-S moieties within the multilayer. By conducting an in situ surface-enhanced Raman spectroscopic study of both the multilayer formation/degradation and the monolayer reduction/oxidation processes, coupled to density functional theory calculations, we provide compelling evidence that an Au-C bond does form upon electroreduction of aryl diazonium salts on gold and that the enhanced stability of the electrografted organic films is due to the Au-C bond being intrinsically stronger than the Au-S bond for a given phenylthiolate compound by ca. 0.4 eV.
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Affiliation(s)
- Limin Guo
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, Jilin 130022, China
- University of Chinese Academy of Sciences , Beijing 100039, China
| | - Lipo Ma
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, Jilin 130022, China
| | - Yelong Zhang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, Jilin 130022, China
- University of Chinese Academy of Sciences , Beijing 100039, China
| | - Xun Cheng
- Department of Chemical Engineering, Louisiana State University , Baton Rouge, Louisiana 70803, United States
| | - Ye Xu
- Department of Chemical Engineering, Louisiana State University , Baton Rouge, Louisiana 70803, United States
| | - Jin Wang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, Jilin 130022, China
- College of Physics, Jilin University , Changchun, Jilin 130012, China
| | - Erkang Wang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, Jilin 130022, China
| | - Zhangquan Peng
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, Jilin 130022, China
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15
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Zhang Y, Qiao J, Gao S, Hu F, He D, Wu B, Yang Z, Xu B, Li Y, Shi Y, Ji W, Wang P, Wang X, Xiao M, Xu H, Xu JB, Wang X. Probing Carrier Transport and Structure-Property Relationship of Highly Ordered Organic Semiconductors at the Two-Dimensional Limit. PHYSICAL REVIEW LETTERS 2016; 116:016602. [PMID: 26799035 DOI: 10.1103/physrevlett.116.016602] [Citation(s) in RCA: 118] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Indexed: 06/05/2023]
Abstract
One of the basic assumptions in organic field-effect transistors, the most fundamental device unit in organic electronics, is that charge transport occurs two dimensionally in the first few molecular layers near the dielectric interface. Although the mobility of bulk organic semiconductors has increased dramatically, direct probing of intrinsic charge transport in the two-dimensional limit has not been possible due to excessive disorders and traps in ultrathin organic thin films. Here, highly ordered single-crystalline mono- to tetralayer pentacene crystals are realized by van der Waals (vdW) epitaxy on hexagonal BN. We find that the charge transport is dominated by hopping in the first conductive layer, but transforms to bandlike in subsequent layers. Such an abrupt phase transition is attributed to strong modulation of the molecular packing by interfacial vdW interactions, as corroborated by quantitative structural characterization and density functional theory calculations. The structural modulation becomes negligible beyond the second conductive layer, leading to a mobility saturation thickness of only ∼3 nm. Highly ordered organic ultrathin films provide a platform for new physics and device structures (such as heterostructures and quantum wells) that are not possible in conventional bulk crystals.
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Affiliation(s)
- Yuhan Zhang
- National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Jingsi Qiao
- Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
| | - Si Gao
- College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
| | - Fengrui Hu
- School of Physics, Nanjing University, Nanjing 210093, China
| | - Daowei He
- National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Bing Wu
- National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Ziyi Yang
- National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Bingchen Xu
- National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Yun Li
- National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Yi Shi
- National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Wei Ji
- Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
- Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China and Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
| | - Peng Wang
- College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
| | - Xiaoyong Wang
- School of Physics, Nanjing University, Nanjing 210093, China
| | - Min Xiao
- School of Physics, Nanjing University, Nanjing 210093, China
- Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
| | - Hangxun Xu
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Jian-Bin Xu
- National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
- Department of Electronic Engineering and Materials Science and Technology Research Center, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Xinran Wang
- National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
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16
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Ning Y, Cramer JR, Nuermaimaiti A, Svane K, Yu M, Lægsgaard E, Besenbacher F, Xue QK, Ma X, Hammer B, Gothelf KV, Linderoth TR. Selection of conformational states in self-assembled surface structures formed from an oligo(naphthylene–ethynylene) 3-bit binary switch. J Chem Phys 2015; 142:101922. [DOI: 10.1063/1.4908062] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Y. Ning
- Interdisciplinary Nanoscience Center (iNANO) and Danish National Research Foundation: Danish-Chinese Centre for Self-Assembly and Function of Molecular Nanostructures on Surfaces, 8000 Aarhus C, Denmark
- Institute of Physics, The Chinese Academy of Sciences, Beijing 100190, China
| | - J. R. Cramer
- Interdisciplinary Nanoscience Center (iNANO) and Danish National Research Foundation: Danish-Chinese Centre for Self-Assembly and Function of Molecular Nanostructures on Surfaces, 8000 Aarhus C, Denmark
- Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark
| | - A. Nuermaimaiti
- Interdisciplinary Nanoscience Center (iNANO) and Danish National Research Foundation: Danish-Chinese Centre for Self-Assembly and Function of Molecular Nanostructures on Surfaces, 8000 Aarhus C, Denmark
| | - K. Svane
- Interdisciplinary Nanoscience Center (iNANO) and Danish National Research Foundation: Danish-Chinese Centre for Self-Assembly and Function of Molecular Nanostructures on Surfaces, 8000 Aarhus C, Denmark
- Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
| | - M. Yu
- Interdisciplinary Nanoscience Center (iNANO) and Danish National Research Foundation: Danish-Chinese Centre for Self-Assembly and Function of Molecular Nanostructures on Surfaces, 8000 Aarhus C, Denmark
| | - E. Lægsgaard
- Interdisciplinary Nanoscience Center (iNANO) and Danish National Research Foundation: Danish-Chinese Centre for Self-Assembly and Function of Molecular Nanostructures on Surfaces, 8000 Aarhus C, Denmark
- Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
| | - F. Besenbacher
- Interdisciplinary Nanoscience Center (iNANO) and Danish National Research Foundation: Danish-Chinese Centre for Self-Assembly and Function of Molecular Nanostructures on Surfaces, 8000 Aarhus C, Denmark
- Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
| | - Q.-K. Xue
- Institute of Physics, The Chinese Academy of Sciences, Beijing 100190, China
| | - X. Ma
- Institute of Physics, The Chinese Academy of Sciences, Beijing 100190, China
| | - B. Hammer
- Interdisciplinary Nanoscience Center (iNANO) and Danish National Research Foundation: Danish-Chinese Centre for Self-Assembly and Function of Molecular Nanostructures on Surfaces, 8000 Aarhus C, Denmark
- Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
| | - K. V. Gothelf
- Interdisciplinary Nanoscience Center (iNANO) and Danish National Research Foundation: Danish-Chinese Centre for Self-Assembly and Function of Molecular Nanostructures on Surfaces, 8000 Aarhus C, Denmark
- Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark
| | - T. R. Linderoth
- Interdisciplinary Nanoscience Center (iNANO) and Danish National Research Foundation: Danish-Chinese Centre for Self-Assembly and Function of Molecular Nanostructures on Surfaces, 8000 Aarhus C, Denmark
- Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
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17
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Zimmerman PM. Single-ended transition state finding with the growing string method. J Comput Chem 2015; 36:601-11. [DOI: 10.1002/jcc.23833] [Citation(s) in RCA: 126] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2014] [Accepted: 12/14/2014] [Indexed: 12/18/2022]
Affiliation(s)
- Paul M. Zimmerman
- Department of Chemistry; University of Michigan; 930 N. University Ave Ann Arbor Michigan 48109
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18
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Hudson PS, White JK, Kearns FL, Hodoscek M, Boresch S, Lee Woodcock H. Efficiently computing pathway free energies: New approaches based on chain-of-replica and Non-Boltzmann Bennett reweighting schemes. Biochim Biophys Acta Gen Subj 2014; 1850:944-953. [PMID: 25239198 DOI: 10.1016/j.bbagen.2014.09.016] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 09/09/2014] [Accepted: 09/10/2014] [Indexed: 11/25/2022]
Abstract
BACKGROUND Accurately modeling condensed phase processes is one of computation's most difficult challenges. Include the possibility that conformational dynamics may be coupled to chemical reactions, where multiscale (i.e., QM/MM) methods are needed, and this task becomes even more daunting. METHODS Free energy simulations (i.e., molecular dynamics), multiscale modeling, and reweighting schemes. RESULTS Herein, we present two new approaches for mitigating the aforementioned challenges. The first is a new chain-of-replica method (off-path simulations, OPS) for computing potentials of mean force (PMFs) along an easily defined reaction coordinate. This development is coupled with a new distributed, highly-parallel replica framework (REPDstr) within the CHARMM package. Validation of these new schemes is carried out on two processes that undergo conformational changes. First is the simple torsional rotation of butane, while a much more challenging glycosidic rotation (in vacuo and solvated) is the second. Additionally, a new approach that greatly improves (i.e., possibly an order of magnitude) the efficiency of computing QM/MM PMFs is introduced and compared to standard schemes. Our efforts are grounded in the recently developed method for efficiently computing QM-based free energies (i.e., QM-Non-Boltzmann Bennett, QM-NBB). Again, we validate this new technique by computing the QM/MM PMF of butane's torsional rotation. CONCLUSIONS The OPS-REPDstr method is a promising new approach that overcomes many limitations of standard pathway simulations in CHARMM. The combination of QM-NBB with pathway techniques is very promising as it offers significant advantages over current procedures. GENERAL SIGNIFICANCE Efficiently computing potentials of mean force is a major, unresolved, area of interest. This article is part of a Special Issue entitled Recent developments of molecular dynamics.
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Affiliation(s)
- Phillip S Hudson
- Department of Chemistry, University of South Florida, 4202 E. Fowler Ave., CHE205, Tampa, FL 33620-5250, USA
| | - Justin K White
- Department of Chemistry, University of South Florida, 4202 E. Fowler Ave., CHE205, Tampa, FL 33620-5250, USA
| | - Fiona L Kearns
- Department of Chemistry, University of South Florida, 4202 E. Fowler Ave., CHE205, Tampa, FL 33620-5250, USA
| | - Milan Hodoscek
- Center for Molecular Modeling, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia
| | - Stefan Boresch
- Department of Computational Biological Chemistry, Faculty of Chemistry, University of Vienna, Währingerstraße 17, A-1090 Vienna, Austria
| | - H Lee Woodcock
- Department of Chemistry, University of South Florida, 4202 E. Fowler Ave., CHE205, Tampa, FL 33620-5250, USA.
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19
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Carro P, Torrelles X, Salvarezza RC. A novel model for the (√3 × √3)R30° alkanethiolate–Au(111) phase based on alkanethiolate–Au adatom complexes. Phys Chem Chem Phys 2014; 16:19017-23. [DOI: 10.1039/c4cp01255k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Klimeš J, Bowler DR, Michaelides A. Understanding the role of ions and water molecules in the NaCl dissolution process. J Chem Phys 2013; 139:234702. [DOI: 10.1063/1.4840675] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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21
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Zimmerman P. Reliable Transition State Searches Integrated with the Growing String Method. J Chem Theory Comput 2013; 9:3043-50. [DOI: 10.1021/ct400319w] [Citation(s) in RCA: 135] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Paul Zimmerman
- Department of Chemistry, University
of Michigan, Ann
Arbor, Michigan 48109, United States
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22
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Ren W, Vanden-Eijnden E. A climbing string method for saddle point search. J Chem Phys 2013; 138:134105. [DOI: 10.1063/1.4798344] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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23
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Kohanoff J, Pinilla C, Youngs TGA, Artacho E, Soler JM. Dispersion interactions in room-temperature ionic liquids: results from a non-empirical density functional. J Chem Phys 2012; 135:154505. [PMID: 22029322 DOI: 10.1063/1.3652897] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The role of dispersion or van de Waals (VDW) interactions in imidazolium-based room-temperature ionic liquids is studied within the framework of density functional theory, using a recently developed non-empirical functional [M. Dion, H. Rydberg, E. Schröder, D. C. Langreth, and B. I. Lundqvist, Phys. Rev. Lett. 92, 246401 (2004)], as efficiently implemented in the SIESTA code [G. Román-Pérez and J. M. Soler, Phys. Rev. Lett. 103, 096102 (2009)]. We present results for the equilibrium structure and lattice parameters of several crystalline phases, finding a general improvement with respect to both the local density (LDA) and the generalized gradient approximations (GGA). Similar to other systems characterized by VDW bonding, such as rare gas and benzene dimers as well as solid argon, equilibrium distances and volumes are consistently overestimated by ≈7%, compared to -11% within LDA and 11% within GGA. The intramolecular geometries are retained, while the intermolecular distances and orientations are significantly improved relative to LDA and GGA. The quality is superior to that achieved with tailor-made empirical VDW corrections ad hoc [M. G. Del Pópolo, C. Pinilla, and P. Ballone, J. Chem. Phys. 126, 144705 (2007)]. We also analyse the performance of an optimized version of this non-empirical functional, where the screening properties of the exchange have been tuned to reproduce high-level quantum chemical calculations [J. Klimes, D. Bowler, and A. Michaelides, J. Phys.: Condens. Matter 22, 074203 (2010)]. The results for solids are even better with volumes and geometries reproduced within 2% of experimental data. We provide some insight into the issue of polymorphism of [bmim][Cl] crystals, and we present results for the geometry and energetics of [bmim][Tf] and [mmim][Cl] neutral and charged clusters, which validate the use of empirical force fields.
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Affiliation(s)
- Jorge Kohanoff
- Atomistic Simulation Centre, Queen's University Belfast, Belfast BT7 1NN, Northern IrelandSchool of Chemistry, University of Bristol, Bristol BS2 1TS, United Kingdom.
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24
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Behn A, Zimmerman PM, Bell AT, Head-Gordon M. Efficient exploration of reaction paths via a freezing string method. J Chem Phys 2011; 135:224108. [DOI: 10.1063/1.3664901] [Citation(s) in RCA: 128] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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25
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Abstract
We present modifications for the method recently developed by Granot and Baer [J. Chem. Phys. 128, 184111 (2008)]. These modifications significantly enhance the efficiency and reliability of the method. In addition, we discuss some specific features of this method. These features provide important flexibilities which are crucial for a double-ended saddle point search method in order to be applicable to complex reaction mechanisms. Furthermore, it is discussed under what circumstances this methods might fail to find the transition state and remedies to avoid such situations are provided. We demonstrate the performance of the enhanced splined saddle method on several examples with increasing complexity, isomerization of ammonia, ethane and cyclopropane molecules, tautomerization of cytosine, the ring opening of cyclobutene, the Stone-Wales transformation of the C(60) fullerene, and finally rolling a small NaCl cube on NaCl(001) surface. All of these calculations are based on density functional theory. The efficiency of the method is remarkable in regard to the reduction of the total computational time.
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Affiliation(s)
- S Alireza Ghasemi
- Department of Physics, Universität Basel, Klingelbergstr. 82, 4056 Basel, Switzerland.
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26
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Brázdová V, Bowler DR. H atom adsorption and diffusion on Si(110)-(1×1) and (2×1) surfaces. Phys Chem Chem Phys 2011; 13:11367-72. [DOI: 10.1039/c1cp20108e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Kirchner B, di Dio PJ, Hutter J. Real-world predictions from ab initio molecular dynamics simulations. Top Curr Chem (Cham) 2011; 307:109-53. [PMID: 21842358 DOI: 10.1007/128_2011_195] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
In this review we present the techniques of ab initio molecular dynamics simulation improved to its current stage where the analysis of existing processes and the prediction of further chemical features and real-world processes are feasible. For this reason we describe the relevant developments in ab initio molecular dynamics leading to this stage. Among them, parallel implementations, different basis set functions, density functionals, and van der Waals corrections are reported. The chemical features accessible through AIMD are discussed. These are IR, NMR, as well as EXAFS spectra, sampling methods like metadynamics and others, Wannier functions, dipole moments of molecules in condensed phase, and many other properties. Electrochemical reactions investigated by ab initio molecular dynamics methods in solution, on surfaces as well as complex interfaces, are also presented.
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Affiliation(s)
- Barbara Kirchner
- Wilhelm-Ostwald Institute of Physical and Theoretical Chemistry, University of Leipzig, Linnéstr. 2, 04103 Leipzig, Germany.
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