201
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Duan S, Zhang IY, Xie Z, Xu X. Identification of Water Hexamer on Cu(111) Surfaces. J Am Chem Soc 2020; 142:6902-6906. [DOI: 10.1021/jacs.0c01549] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sai Duan
- Collaborative Innovation Center of Chemistry for Energy Materials, Shanghai, Key Laboratory of Molecular Catalysis and Innovative Materials, MOE Key Laboratory of Computational Physical Sciences, Department of Chemistry, Fudan University, Shanghai 200433, People’s Republic of China
| | - Igor Ying Zhang
- Collaborative Innovation Center of Chemistry for Energy Materials, Shanghai, Key Laboratory of Molecular Catalysis and Innovative Materials, MOE Key Laboratory of Computational Physical Sciences, Department of Chemistry, Fudan University, Shanghai 200433, People’s Republic of China
| | - Zhen Xie
- Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, S-106 91 Stockholm, Sweden
| | - Xin Xu
- Collaborative Innovation Center of Chemistry for Energy Materials, Shanghai, Key Laboratory of Molecular Catalysis and Innovative Materials, MOE Key Laboratory of Computational Physical Sciences, Department of Chemistry, Fudan University, Shanghai 200433, People’s Republic of China
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202
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Geilhufe RM, Kahlhoefer F, Winkler MW. Dirac materials for sub-MeV dark matter detection: New targets and improved formalism. Int J Clin Exp Med 2020. [DOI: 10.1103/physrevd.101.055005] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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203
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Yu LJ, Dale SG, Chan B, Karton A. Benchmark study of DFT and composite methods for bond dissociation energies in argon compounds. Chem Phys 2020. [DOI: 10.1016/j.chemphys.2019.110676] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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204
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Santos Rego J, de Koning M. Density-functional theory prediction of the elastic constants of ice Ih. J Chem Phys 2020; 152:084502. [DOI: 10.1063/1.5142710] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Jéssica Santos Rego
- Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, UNICAMP, Campinas, 13083-859, São Paulo, Brazil
| | - Maurice de Koning
- Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, UNICAMP, Campinas, 13083-859, São Paulo, Brazil
- Center for Computing in Engineering and Sciences, Universidade Estadual de Campinas, UNICAMP, Campinas, 13083-861 São Paulo, Brazil
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205
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Zaki A, Carrasco J, Bielsa D, Faik A. Tunable Redox Temperature of a Co 3-xMn xO 4 (0 ≤ x ≤ 3) Continuous Solid Solution for Thermochemical Energy Storage. ACS APPLIED MATERIALS & INTERFACES 2020; 12:7010-7020. [PMID: 31927944 DOI: 10.1021/acsami.9b14369] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Heat-storage technologies are well suited to improve the energy efficiency of power plants and the recovery of process heat. A good option for high storage capacities, especially at high temperatures, is storing thermal energy by reversible thermochemical reactions. In particular, the Co3O4/CoO and Mn2O3/Mn3O4 redox-active couples are known to be very promising systems. However, cost and toxicity issues for Co oxides and the sluggish oxidation rate (leading to poor reversibility) for Mn oxide hinder the applicability of these single oxides. Considering, instead, binary Co-Mn oxide mixtures could mitigate the above-mentioned shortcomings. To examine this in detail, here, we combine first-principles atomistic calculations and experiments to provide a structural characterization and observe the thermal behavior of novel mixed-metal oxides based on cobalt/manganese metals with the spinel structure Co3-xMnxO4. We show that novel Co3-xMnxO4 phases indeed enhance the enthalpy of the redox reactions, facilitate reversibility, and mitigate energy losses when compared to pure metal oxide systems. Our results expand therefore the limited list of currently available thermochemical heat-storage materials and pave the way toward the implementation of tunable redox temperature materials for practical applications.
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Affiliation(s)
- Abdelali Zaki
- CIC Energigune , Albert Einstein 48 , 01510 Miñano , Álava , Spain
| | - Javier Carrasco
- CIC Energigune , Albert Einstein 48 , 01510 Miñano , Álava , Spain
| | - Daniel Bielsa
- CIC Energigune , Albert Einstein 48 , 01510 Miñano , Álava , Spain
| | - Abdessamad Faik
- CIC Energigune , Albert Einstein 48 , 01510 Miñano , Álava , Spain
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206
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Kraisler E. Asymptotic Behavior of the Exchange‐Correlation Energy Density and the Kohn‐Sham Potential in Density Functional Theory: Exact Results and Strategy for Approximations. Isr J Chem 2020. [DOI: 10.1002/ijch.201900103] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Eli Kraisler
- Fritz Haber Center for Molecular Dynamics and Institute of Chemistry The Hebrew University of Jerusalem 9091401 Jerusalem Israel
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207
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Si Y, Li M, Zhou Z, Liu M, Prezhdo O. Improved description of hematite surfaces by the SCAN functional. J Chem Phys 2020; 152:024706. [PMID: 31941307 DOI: 10.1063/1.5134951] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Controversies on the surface termination of α-Fe2O3 (0001) focus on its surface stoichiometry dependence on the oxygen chemical potential. Density functional theory (DFT) calculations applying the commonly accepted Perdew-Burke-Ernzerhof (PBE) exchange-correlation functional to a strongly correlated system predict the best matching surface termination, but would produce a delocalization error, resulting in an inappropriate bandgap, and thus are not applicable for comprehensive hematite system studies. Besides, the widely applied PBE+U scheme cannot provide evidence for existence of some of the successfully synthesized stoichiometric α-Fe2O3 (0001) surfaces. Hence, a better scheme is needed for hematite DFT studies. This work investigates whether the strongly constrained and appropriately normed (SCAN) approximation reported by Perdew et al. could provide an improved result for the as-mentioned problem, and whether SCAN can be applied to hematite systems. By comparing the results calculated with the PBE, SCAN, PBE+U, and SCAN+U schemes, we find that SCAN and SCAN+U improves the description of the electronic structure of different stoichiometric α-Fe2O3 (0001) surfaces with respect to the PBE results, and that they give a consistent prediction of the surface terminations. Besides, the bulk lattice constants and the bulk density of states are also improved with the SCAN functional. This study provides a general characterization of the α-Fe2O3 (0001) surfaces and rationalizes how the SCAN approximation improves the results of hematite surface calculations.
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Affiliation(s)
- Yitao Si
- International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China
| | - Mingtao Li
- International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China
| | - Zhaohui Zhou
- Chemical Engineering and Technology, School of Environmental Science and Engineering, Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang'an University, Xi'an 710064, China
| | - Maochang Liu
- International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China
| | - Oleg Prezhdo
- Deparment of Chemistry, University of Southern California, Los Angeles, California 90089, USA
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208
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Jana S, Constantin LA, Samal P. Accurate Water Properties from an Efficient ab Initio Method. J Chem Theory Comput 2020; 16:974-987. [DOI: 10.1021/acs.jctc.9b01018] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Subrata Jana
- School of Physical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar 752050, India
| | - Lucian A. Constantin
- Center for Biomolecular Nanotechnologies @UNILE, Istituto Italiano di Tecnologia, Via Barsanti, I-73010 Arnesano, Italy
| | - Prasanjit Samal
- School of Physical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar 752050, India
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209
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Zhou S, Ning J, Sun J, Srolovitz DJ. Composition-induced type I and direct bandgap transition metal dichalcogenides alloy vertical heterojunctions. NANOSCALE 2020; 12:201-209. [PMID: 31808497 DOI: 10.1039/c9nr08345f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
While members of the 2D semiconducting transition metal dichalcogenide (TMD) family MX2 (M = {Mo, W}, X = {S, Se}) are promising for device applications, stacked layer (vertical) heterojunctions exhibit features that make them inappropriate for light-emitting applications. Such vertical heterojunctions exhibit type II, rather than the preferred type I band alignment. Using density functional theory calculations, we identify the pseudo-binary and quaternary alloy composition range for which band alignment is type I. While broad regions of composition space lead to type I band alignment, most light-emitting devices require direct bandgaps. We demonstrate that by taking advantage of alloying and/or twisting between layers, a wide range of type I, direct bandgap stacked layer (vertical) heterojunctions are achievable. These results and the underlying method developed here provide new opportunities for TMD vertical heterojunction device optimization and opens the door to new classes of TMD vertical heterojunction device applications.
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Affiliation(s)
- Songsong Zhou
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
| | - Jinliang Ning
- Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA
| | - Jianwei Sun
- Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA
| | - David J Srolovitz
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA. and Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA and Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR
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210
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211
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Chen X, Granda-Marulanda LP, McCrum IT, Koper MTM. Adsorption processes on a Pd monolayer-modified Pt(111) electrode. Chem Sci 2020; 11:1703-1713. [PMID: 34084392 PMCID: PMC8148025 DOI: 10.1039/c9sc05307g] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Specific adsorption of anions is an important aspect in surface electrochemistry for its influence on reaction kinetics in either a promoted or inhibited fashion. Perchloric acid is typically considered as an ideal electrolyte for investigating electrocatalytic reactions due to the lack of specific adsorption of the perchlorate anion on several metal electrodes. In this work, cyclic voltammetry and computational methods are combined to investigate the interfacial processes on a Pd monolayer deposited on Pt(111) single crystal electrode in perchloric acid solution. The “hydrogen region” of this PdMLPt(111) surface exhibits two voltammetric peaks: the first “hydrogen peak” at 0.246 VRHE actually involves the replacement of hydrogen by hydroxyl, and the second “hydrogen peak” HII at 0.306 VRHE appears to be the replacement of adsorbed hydroxyl by specific perchlorate adsorption. The two peaks merge into a single peak when a more strongly adsorbed anion, such as sulfate, is involved. Our density functional theory calculations qualitatively support the peak assignment and show that anions generally bind more strongly to the PdMLPt(111) surface than to Pt(111). Specific adsorption of anions is an important aspect in surface electrochemistry for its influence on reaction kinetics in either a promoted or inhibited fashion.![]()
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Affiliation(s)
- Xiaoting Chen
- Leiden Institute of Chemistry, Leiden University PO Box 9502 Leiden 2300 RA The Netherlands
| | | | - Ian T McCrum
- Leiden Institute of Chemistry, Leiden University PO Box 9502 Leiden 2300 RA The Netherlands
| | - Marc T M Koper
- Leiden Institute of Chemistry, Leiden University PO Box 9502 Leiden 2300 RA The Netherlands
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212
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Zhang Y, Lane C, Furness JW, Barbiellini B, Perdew JP, Markiewicz RS, Bansil A, Sun J. Competing stripe and magnetic phases in the cuprates from first principles. Proc Natl Acad Sci U S A 2020; 117:68-72. [PMID: 31843896 PMCID: PMC6955329 DOI: 10.1073/pnas.1910411116] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Realistic description of competing phases in complex quantum materials has proven extremely challenging. For example, much of the existing density-functional-theory-based first-principles framework fails in the cuprate superconductors. Various many-body approaches involve generic model Hamiltonians and do not account for the interplay between the spin, charge, and lattice degrees of freedom. Here, by deploying the recently constructed strongly constrained and appropriately normed (SCAN) density functional, we show how the landscape of competing stripe and magnetic phases can be addressed on a first-principles basis both in the parent insulator YBa2Cu3O6 and the near-optimally doped YBa2Cu3O7 as archetype cuprate compounds. In YBa2Cu3O7, we find many stripe phases that are nearly degenerate with the ground state and may give rise to the pseudogap state from which the high-temperature superconducting state emerges. We invoke no free parameters such as the Hubbard U, which has been the basis of much of the existing cuprate literature. Lattice degrees of freedom are found to be crucially important in stabilizing the various phases.
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Affiliation(s)
- Yubo Zhang
- Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70118
| | - Christopher Lane
- Department of Physics, Northeastern University, Boston, MA 02115
| | - James W Furness
- Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70118
| | - Bernardo Barbiellini
- Department of Physics, School of Engineering Science, LUT University, FI-53851 Lappeenranta, Finland
- Department of Physics, Northeastern University, Boston, MA 02115
| | - John P Perdew
- Department of Physics, Temple University, Philadelphia, PA 19122;
- Department of Chemistry, Temple University, Philadelphia, PA 19122
| | | | - Arun Bansil
- Department of Physics, Northeastern University, Boston, MA 02115;
| | - Jianwei Sun
- Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70118;
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213
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Wang R, Carnevale V, Klein ML, Borguet E. First-Principles Calculation of Water p Ka Using the Newly Developed SCAN Functional. J Phys Chem Lett 2020; 11:54-59. [PMID: 31834803 DOI: 10.1021/acs.jpclett.9b02913] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Acid/base chemistry is an intriguing topic that still constitutes a challenge for computational chemistry. While estimating the acid dissociation constant (or pKa) could shed light on many chemistry processes, especially in the fields of biochemistry and geochemistry, evaluating the relative stability between protonated and nonprotonated species is often very difficult. Indeed, a prerequisite for calculating the pKa of any molecule is an accurate description of the energetics of water dissociation. Here, we applied constrained molecular dynamics simulations, a noncanonical sampling technique, to investigate the water deprotonation process by selecting the OH distance as the reaction coordinate. The calculation is based on density functional theory and the newly developed SCAN functional, which has shown excellent performance in describing water structure. This first benchmark of SCAN on a chemical reaction shows that this functional accurately models the energetics of proton transfer reactions in an aqueous environment. After taking Coulomb long-range corrections and nuclear quantum effects into account, the estimated water pKa is only 1.0 pKa unit different from the target experimental value. Our results show that the combination of SCAN and constrained MD successfully reproduces the chemistry of water and constitutes a good framework for calculating the free energy of chemical reactions of interest.
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Affiliation(s)
- Ruiyu Wang
- Department of Chemistry , Temple University , Philadelphia , Pennsylvania 19122 , United States
- Center for Complex Materials from First-Principles (CCM) , Temple University , 1925 North 12th Street , Philadelphia , Pennsylvania 19122 , United States
| | - Vincenzo Carnevale
- Institute for Computational Molecular Science , Temple University , Philadelphia , Pennsylvania 19122 , United States
- Department of Biology , Temple University , Philadelphia , Pennsylvania 19122 , United States
| | - Michael L Klein
- Department of Chemistry , Temple University , Philadelphia , Pennsylvania 19122 , United States
- Center for Complex Materials from First-Principles (CCM) , Temple University , 1925 North 12th Street , Philadelphia , Pennsylvania 19122 , United States
- Institute for Computational Molecular Science , Temple University , Philadelphia , Pennsylvania 19122 , United States
| | - Eric Borguet
- Department of Chemistry , Temple University , Philadelphia , Pennsylvania 19122 , United States
- Center for Complex Materials from First-Principles (CCM) , Temple University , 1925 North 12th Street , Philadelphia , Pennsylvania 19122 , United States
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214
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Zhao G, Shi S, Xie H, Xu Q, Ding M, Zhao X, Yan J, Wang D. Equation of state of water based on the SCAN meta-GGA density functional. Phys Chem Chem Phys 2020; 22:4626-4631. [DOI: 10.1039/c9cp06362e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
By ab initio molecular dynamics simulations, the newly developed SCAN meta-GGA functional is proved better than the widely used PBE-GGA functional in describing the equation of state of water.
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Affiliation(s)
- Gang Zhao
- School of Physics and Optoelectronic Engineering
- Ludong University
- Yantai 264025
- P. R. China
| | - Shuyi Shi
- School of Physics and Optoelectronic Engineering
- Ludong University
- Yantai 264025
- P. R. China
| | - Huijuan Xie
- School of Physics and Optoelectronic Engineering
- Ludong University
- Yantai 264025
- P. R. China
| | - Qiushuang Xu
- School of Physics and Optoelectronic Engineering
- Ludong University
- Yantai 264025
- P. R. China
| | - Mingcui Ding
- School of Physics and Optoelectronic Engineering
- Ludong University
- Yantai 264025
- P. R. China
| | - Xuguang Zhao
- School of Physics and Optoelectronic Engineering
- Ludong University
- Yantai 264025
- P. R. China
| | - Jinliang Yan
- School of Physics and Optoelectronic Engineering
- Ludong University
- Yantai 264025
- P. R. China
| | - Dehua Wang
- School of Physics and Optoelectronic Engineering
- Ludong University
- Yantai 264025
- P. R. China
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215
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Santos IC, Gama V, Rabaça S, Veiros LF, Nogueira F, Paixão JA, Almeida M. Structural diversity in conducting bilayer salts (CNB-EDT-TTF) 4A. CrystEngComm 2020. [DOI: 10.1039/d0ce01433h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The family of recently described salts based on the electron donor CNB-EDT-TTF and different anions A, with general formula (CNB-EDT-TTF)4A, constitutes an unprecedented type of molecular conductor based on a bilayer structure of the donors.
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Affiliation(s)
- Isabel C. Santos
- C2TN and DECN
- IST
- Universidade de Lisboa
- 2695-066 Bobadela LRS
- Portugal
| | - Vasco Gama
- C2TN and DECN
- IST
- Universidade de Lisboa
- 2695-066 Bobadela LRS
- Portugal
| | - Sandra Rabaça
- C2TN and DECN
- IST
- Universidade de Lisboa
- 2695-066 Bobadela LRS
- Portugal
| | - Luís F. Veiros
- CQE and DEQ
- IST
- Universidade de Lisboa
- 1049-001, Lisboa
- Portugal
| | - Fernando Nogueira
- CFisUC
- Departamento de Física – Universidade de Coimbra
- Coimbra
- Portugal
| | - José A. Paixão
- CFisUC
- Departamento de Física – Universidade de Coimbra
- Coimbra
- Portugal
| | - Manuel Almeida
- C2TN and DECN
- IST
- Universidade de Lisboa
- 2695-066 Bobadela LRS
- Portugal
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216
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Aydin F, Zhan C, Ritt C, Epsztein R, Elimelech M, Schwegler E, Pham TA. Similarities and differences between potassium and ammonium ions in liquid water: a first-principles study. Phys Chem Chem Phys 2020; 22:2540-2548. [DOI: 10.1039/c9cp06163k] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Understanding ion solvation in liquid water is critical in optimizing materials for a wide variety of emerging technologies, including water desalination and purification.
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Affiliation(s)
- Fikret Aydin
- Lawrence Livermore National Laboratory
- Livermore
- USA
| | - Cheng Zhan
- Lawrence Livermore National Laboratory
- Livermore
- USA
| | - Cody Ritt
- Department of Chemical and Environmental Engineering
- Yale University
- New Haven
- USA
| | - Razi Epsztein
- Department of Chemical and Environmental Engineering
- Yale University
- New Haven
- USA
- Faculty of Civil and Environmental Engineering
| | - Menachem Elimelech
- Department of Chemical and Environmental Engineering
- Yale University
- New Haven
- USA
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217
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Duignan TT, Schenter GK, Fulton JL, Huthwelker T, Balasubramanian M, Galib M, Baer MD, Wilhelm J, Hutter J, Del Ben M, Zhao XS, Mundy CJ. Quantifying the hydration structure of sodium and potassium ions: taking additional steps on Jacob's Ladder. Phys Chem Chem Phys 2020; 22:10641-10652. [DOI: 10.1039/c9cp06161d] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ability to reproduce the experimental structure of water around the sodium and potassium ions is a key test of the quality of interaction potentials due to the central importance of these ions in a wide range of important phenomena.
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Affiliation(s)
- Timothy T. Duignan
- Physical Science Division
- Pacific Northwest National Laboratory
- Richland
- USA
- School of Chemical Engineering
| | | | - John L. Fulton
- Physical Science Division
- Pacific Northwest National Laboratory
- Richland
- USA
| | - Thomas Huthwelker
- Swiss Light Source
- Paul Scherrer Institut (PSI)
- 5232 Villigen
- Switzerland
| | | | - Mirza Galib
- Physical Science Division
- Pacific Northwest National Laboratory
- Richland
- USA
| | - Marcel D. Baer
- Physical Science Division
- Pacific Northwest National Laboratory
- Richland
- USA
| | - Jan Wilhelm
- Department of Chemistry
- University of Zurich
- CH-8057 Zürich
- Switzerland
- Institute of Theoretical Physics
| | - Jürg Hutter
- Department of Chemistry
- University of Zurich
- CH-8057 Zürich
- Switzerland
| | - Mauro Del Ben
- Computational Research Division
- Lawrence Berkeley National Laboratory
- Berkeley
- USA
| | - X. S. Zhao
- School of Chemical Engineering
- The University of Queensland
- Brisbane 4072
- Australia
| | - Christopher J. Mundy
- Physical Science Division
- Pacific Northwest National Laboratory
- Richland
- USA
- Department of Chemical Engineering
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218
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DelloStritto M, Xu J, Wu X, Klein ML. Aqueous solvation of the chloride ion revisited with density functional theory: impact of correlation and exchange approximations. Phys Chem Chem Phys 2020; 22:10666-10675. [DOI: 10.1039/c9cp06821j] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Aqueous chloride is simulated using PBE-D3, PBE0-D3, and SCAN to investigate the impact of exchange and correlation approximations; we find the exact exchange fraction strongly impacts the energetics and polarizability of solvated chloride.
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Affiliation(s)
- Mark DelloStritto
- Institute for Computational Molecular Science
- Temple University SERC
- Philadelphia
- USA
| | - Jianhang Xu
- Department of Physics
- Temple University SERC
- Philadelphia
- USA
| | - Xifan Wu
- Department of Physics
- Temple University SERC
- Philadelphia
- USA
| | - Michael L. Klein
- Institute for Computational Molecular Science
- Temple University SERC
- Philadelphia
- USA
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219
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Zhong K, Yu CC, Dodia M, Bonn M, Nagata Y, Ohto T. Vibrational mode frequency correction of liquid water in density functional theory molecular dynamics simulations with van der Waals correction. Phys Chem Chem Phys 2020; 22:12785-12793. [DOI: 10.1039/c9cp06335h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
We develop a frequency correction scheme for the stretch and bending modes of liquid water, which substantially improves the prediction of the vibrational spectra.
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Affiliation(s)
- Kai Zhong
- Hefei National Laboratory for Physical Sciences at the Microscale
- Collaborative Innovation Center of Chemistry for Energy Materials
- CAS Center for Excellence in Nanoscience
- School of Chemistry and Materials Science
- University of Science and Technology of China
| | - Chun-Chieh Yu
- Max Planck Institute for Polymer Research
- Ackermannweg 10
- 55128 Mainz
- Germany
| | - Mayank Dodia
- Max Planck Institute for Polymer Research
- Ackermannweg 10
- 55128 Mainz
- Germany
| | - Mischa Bonn
- Max Planck Institute for Polymer Research
- Ackermannweg 10
- 55128 Mainz
- Germany
| | - Yuki Nagata
- Max Planck Institute for Polymer Research
- Ackermannweg 10
- 55128 Mainz
- Germany
| | - Tatsuhiko Ohto
- Graduate School of Engineering Science
- Osaka University
- Osaka 560-8531
- Japan
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220
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Zhang Y, Zhang W, Singh DJ. Localization in the SCAN meta-generalized gradient approximation functional leading to broken symmetry ground states for graphene and benzene. Phys Chem Chem Phys 2020; 22:19585-19591. [DOI: 10.1039/d0cp03567j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
SCAN over localizes orbitals leading to spin symmetry broken ground states in graphene and benzene.
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Affiliation(s)
- Yubo Zhang
- Department of Physics and Shenzhen Institute for Quantum Science & Engineering
- Southern University of Science and Technology
- Shenzhen
- China
- Guangdong Provincial Key Lab for Computational Science and Materials Design, and Shenzhen Municipal Key Lab for Advanced Quantum Materials and Devices
| | - Wenqing Zhang
- Department of Physics and Shenzhen Institute for Quantum Science & Engineering
- Southern University of Science and Technology
- Shenzhen
- China
- Guangdong Provincial Key Lab for Computational Science and Materials Design, and Shenzhen Municipal Key Lab for Advanced Quantum Materials and Devices
| | - David J. Singh
- Department of Physics and Astronomy
- University of Missouri
- Columbia
- USA
- Department of Chemistry
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221
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Kim T, Ri C, Yun H, An R, Han G, Chae S, Kim G, Jong G, Jon Y. A Novel Method for Calculation of Molecular Energies and Charge Distributions by Thermodynamic Formalization. Sci Rep 2019; 9:20264. [PMID: 31889056 PMCID: PMC6937252 DOI: 10.1038/s41598-019-56312-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 12/03/2019] [Indexed: 11/29/2022] Open
Abstract
The paper describes a new approach to the thermodynamic formalization for calculation of molecular energy and charge distribution in ground state by means of the variational equation of DFT. In order to thermodynamically formalize the molecular calculation, the pseudo chemical potential (PCP) is conceptualized, where a molecule is broken into multi-phase(atom) one-component(electron) systems and the energy of system is represented as PCP. Calculation of the molecular energy and atomic charge by PCP is put forward, thereafter the approach is proved to be valid and its efficiency (accuracy and calculation speed) is verified.
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Affiliation(s)
- TongIl Kim
- Institute of Chemistry and Biology, University of Science, Pyongyang, 950003, Democratic People's Republic of Korea.
| | - ChungIl Ri
- Institute of Chemistry and Biology, University of Science, Pyongyang, 950003, Democratic People's Republic of Korea
| | - HakSung Yun
- Institute of Chemistry and Biology, University of Science, Pyongyang, 950003, Democratic People's Republic of Korea
| | - RyongNam An
- Institute of Chemistry and Biology, University of Science, Pyongyang, 950003, Democratic People's Republic of Korea
| | - GwangBok Han
- Institute of Chemistry and Biology, University of Science, Pyongyang, 950003, Democratic People's Republic of Korea
| | - SungIl Chae
- Institute of Chemistry and Biology, University of Science, Pyongyang, 950003, Democratic People's Republic of Korea
| | - GyongNam Kim
- Institute of Chemistry and Biology, University of Science, Pyongyang, 950003, Democratic People's Republic of Korea
| | - GwangChol Jong
- Institute of Chemistry and Biology, University of Science, Pyongyang, 950003, Democratic People's Republic of Korea
| | - Yung Jon
- Institute of Chemistry and Biology, University of Science, Pyongyang, 950003, Democratic People's Republic of Korea.
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222
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Yekutiel M, Kukliansky A, Natan A. Cu
2
MgO
3
Electronic and Magnetic Properties – a DFT Study. Isr J Chem 2019. [DOI: 10.1002/ijch.201900100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Mivsam Yekutiel
- Department of Physical Electronics Tel-Aviv University Tel-Aviv Israel
| | - Alon Kukliansky
- Department of Physical Electronics Tel-Aviv University Tel-Aviv Israel
| | - Amir Natan
- Department of Physical Electronics Tel-Aviv University Tel-Aviv Israel
- The Sackler Center for Computational Molecular and Materials Science Tel-Aviv University Tel-Aviv Israel
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223
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Santana JA, Krogel JT, Okamoto S, Reboredo FA. Electron Confinement and Magnetism of (LaTiO3)1/(SrTiO3)5 Heterostructure: A Diffusion Quantum Monte Carlo Study. J Chem Theory Comput 2019; 16:643-650. [DOI: 10.1021/acs.jctc.9b00678] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Juan A. Santana
- Department of Chemistry, University of Puerto Rico at Cayey, P.O. Box 372230, Cayey, PR 00737-2230, United States
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Jaron T. Krogel
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Satoshi Okamoto
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Fernando A. Reboredo
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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224
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First-Principles Calculation of Transition Metal Hyperfine Coupling Constants with the Strongly Constrained and Appropriately Normed (SCAN) Density Functional and its Hybrid Variants. MAGNETOCHEMISTRY 2019. [DOI: 10.3390/magnetochemistry5040069] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Density functional theory (DFT) is used extensively for the first-principles calculation of hyperfine coupling constants in both main-group and transition metal systems. As with many other properties, the performance of DFT for hyperfine coupling constants is of variable quality, particularly for transition metal complexes, because it strongly depends on the nature of the chemical system and the type of approximation to the exchange-correlation functional. Recently, a meta-generalized-gradient approximation (mGGA) functional was proposed that obeys all known exact constraints for such a method, known as the Strongly Constrained and Appropriately Normed (SCAN) functional. In view of its theoretically superior formulation a benchmark set of complexes is used to assess the performance of SCAN for the challenging case of transition metal hyperfine coupling constants. In addition, two global hybrid versions of the functional, SCANh and SCAN0, are described and tested. The values computed with the new functionals are compared with experiment and with those of other DFT approximations. Although the original SCAN and the SCAN-based hybrids may offer improved hyperfine coupling constants for specific systems, no uniform improvement is observed. On the contrary, there are specific cases where the new functionals fail badly due to a flawed description of the underlying electronic structure. Therefore, despite these methodological advances, systematically accurate and system-independent prediction of transition metal hyperfine coupling constants with DFT remains an unmet challenge.
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225
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Yu L, Ruzsinszky A, Yan Q. Chemisorption Can Reverse Defect-Defect Interaction on Heterogeneous Catalyst Surfaces. J Phys Chem Lett 2019; 10:7311-7317. [PMID: 31709799 DOI: 10.1021/acs.jpclett.9b02681] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Atomic-level understanding of roles of defect-defect interaction in the bonding of adsorbates on surfaces is critical for tailoring catalysts atom-by-atom and designing new catalysts. Here, from first-principles calculations, we propose a microscopic mechanism for the role of sulfur vacancy-vacancy interaction in hydrogen bonding on surfaces of MoS2, a nonprecious two-dimensional catalyst for hydrogen evolution reaction. We find that before hydrogen adsorption the interaction of a sulfur vacancy with others is repulsive, originating from the antibonding-like coupling of occupied in-gap vacancy states. When the sulfur vacancy is adsorbed by a hydrogen atom, its interaction with other unadsorbed sulfur vacancies becomes attractive, which can be attributed to the decoupling of repulsive vacancy-vacancy interactions and the occupying of bonding-like coupling states between the in-gap vacancy states that are unoccupied before hydrogen adsorption. This repulsive-to-attractive reverse of vacancy-vacancy interaction reduces the hydrogen adsorption energy and explains why the hydrogen adsorption energy decreases with increasing sulfur vacancy concentration. The emerging picture enables a more general discussion of local defect effects on the adsorption of various adsorbates at different surfaces, providing guidance to improve catalytic performance through defect engineering.
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Affiliation(s)
- Liping Yu
- Department of Physics and Astronomy , University of Maine , Orono , Maine 04469 , United States
| | - Adrienn Ruzsinszky
- Department of Physics , Temple University , Philadelphia , Pennsylvania 19122 , United States
| | - Qimin Yan
- Department of Physics , Temple University , Philadelphia , Pennsylvania 19122 , United States
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226
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Bartók AP, Yates JR. Response to “Comment on ‘Regularized SCAN functional’” [J. Chem. Phys. 151, 207101 (2019)]. J Chem Phys 2019; 151:207102. [DOI: 10.1063/1.5128484] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Albert P. Bartók
- Rutherford Appleton Laboratory, Scientific Computing Department Science and Technology Facilities Council, Didcot OX11 0QX, United Kingdom
| | - Jonathan R. Yates
- Department of Materials, University of Oxford, Oxford OX1 3PH, United Kingdom
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227
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Wang H, Qiu Z, Xia W, Ming C, Han Y, Cao L, Lu J, Zhang P, Zhang S, Xu H, Sun YY. Semimetal or Semiconductor: The Nature of High Intrinsic Electrical Conductivity in TiS 2. J Phys Chem Lett 2019; 10:6996-7001. [PMID: 31652068 DOI: 10.1021/acs.jpclett.9b02710] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
As an intensively studied electrode material for secondary batteries, TiS2 is known to exhibit high electrical conductivity without extrinsic doping. However, the origin of this high conductivity, either being a semimetal or a heavily self-doped semiconductor, has been debated for several decades. Here, combining quasi-particle GW calculations, density functional theory (DFT) study on intrinsic defects, and scanning tunneling microscopy/spectroscopy (STM/STS) measurements, we conclude that stoichiometric TiS2 is a semiconductor with an indirect band gap of about 0.5 eV. The high conductivity of TiS2 is therefore caused by heavy self-doping. Our DFT results suggest that the dominant donor defect that is responsible for the self-doping under thermal equilibrium is Ti interstitial, which is corroborated by our STM/STS measurements.
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Affiliation(s)
- Han Wang
- Department of Physics, Applied Physics, and Astronomy , Rensselaer Polytechnic Institute , Troy , New York 12180 , United States
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Zhizhan Qiu
- Department of Chemistry , National University of Singapore , Singapore 117543
| | - Weiyi Xia
- Department of Physics , University at Buffalo, State University of New York , Buffalo , New York 14260 , United States
| | - Chen Ming
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure , Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 201899 , China
| | - Yuyan Han
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions , High Magnetic Field Laboratory of the Chinese Academy of Sciences , Hefei 230031 , China
| | - Liang Cao
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions , High Magnetic Field Laboratory of the Chinese Academy of Sciences , Hefei 230031 , China
| | - Jiong Lu
- Department of Chemistry , National University of Singapore , Singapore 117543
| | - Peihong Zhang
- Department of Physics , University at Buffalo, State University of New York , Buffalo , New York 14260 , United States
| | - Shengbai Zhang
- Department of Physics, Applied Physics, and Astronomy , Rensselaer Polytechnic Institute , Troy , New York 12180 , United States
| | - Hai Xu
- Changchun Institute of Optics, Fine Mechanics, and Physics, Chinese Academy of Sciences , Changchun 130033 , China
- Center of Materials Science and Optoelectronics Engineering , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Yi-Yang Sun
- Department of Physics, Applied Physics, and Astronomy , Rensselaer Polytechnic Institute , Troy , New York 12180 , United States
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure , Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 201899 , China
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228
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Qin X, Hu W, Yang J. Tunable Schottky and Ohmic contacts in graphene and tellurene van der Waals heterostructures. Phys Chem Chem Phys 2019; 21:23611-23619. [PMID: 31624813 DOI: 10.1039/c9cp04654b] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We systematically investigate the effects of external electric field and interlayer coupling on the electronic structures and contact characteristics of hybrid graphene and tellurene (G/Te) van der Waals heterostructures (vdWHs) based on first-principles calculations. Our results show that the G/α-Te interface is formed by an n-type Schottky contact with a negligible Schottky barrier height (SBH), while the G/β-Te interface is formed by a p-type Schottky contact with a SBH of 0.51 eV. By applying external electric fields perpendicular to the G/Te interfaces or changing the interlayer distance between the graphene and tellurene monolayers, both Schottky barriers and contact types (n-type Schottky, p-type Schottky, and Ohmic) at the G/Te interfaces can be effectively modulated. The changes in charge transfer, as well as the corresponding interface dipole and potential step with the external electric field and interlayer coupling, are revealed to account for the reason for tunable Schottky and Ohmic contacts at the G/Te interfaces. Therefore, the G/Te vdWHs show tunable Schottky and Ohmic contacts with promising applications of graphene-based field-effect transistors in future experiments.
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Affiliation(s)
- Xinming Qin
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
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229
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Stavila V, Foster ME, Brown JW, Davis RW, Edgington J, Benin AI, Zarkesh RA, Parthasarathi R, Hoyt DW, Walter ED, Andersen A, Washton NM, Lipton AS, Allendorf MD. IRMOF-74( n)-Mg: a novel catalyst series for hydrogen activation and hydrogenolysis of C-O bonds. Chem Sci 2019; 10:9880-9892. [PMID: 32015812 PMCID: PMC6977460 DOI: 10.1039/c9sc01018a] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Accepted: 09/02/2019] [Indexed: 12/15/2022] Open
Abstract
Metal-Organic Frameworks (MOFs) that catalyze hydrogenolysis reactions are rare and there is little understanding of how the MOF, hydrogen, and substrate molecules interact. In this regard, the isoreticular IRMOF-74 series, two of which are known catalysts for hydrogenolysis of aromatic C-O bonds, provides an unusual opportunity for systematic probing of these reactions. The diameter of the 1D open channels can be varied within a common topology owing to the common secondary building unit (SBU) and controllable length of the hydroxy-carboxylate struts. We show that the first four members of the IRMOF-74(Mg) series are inherently catalytic for aromatic C-O bond hydrogenolysis and that the conversion varies non-monotonically with pore size. These catalysts are recyclable and reusable, retaining their crystallinity and framework structure after the hydrogenolysis reaction. The hydrogenolysis conversion of phenylethylphenyl ether (PPE), benzylphenyl ether (BPE), and diphenyl ether (DPE) varies as PPE > BPE > DPE, consistent with the strength of the C-O bond. Counterintuitively, however, the conversion also follows the trend IRMOF-74(III) > IRMOF-74(IV) > IRMOF-74(II) > IRMOF-74(I), with little variation in the corresponding selectivity. DFT calculations suggest the unexpected behavior is due to much stronger ether and phenol binding to the Mg(ii) open metal sites (OMS) of IRMOF-74(III), resulting from a structural distortion that moves the Mg2+ ions toward the interior of the pore. Solid-state 25Mg NMR data indicate that both H2 and ether molecules interact with the Mg(ii) OMS and hydrogen-deuterium exchange reactions show that these MOFs activate dihydrogen bonds. The results suggest that both confinement and the presence of reactive metals are essential for achieving the high catalytic activity, but that subtle variations in pore structure can significantly affect the catalysis. Moreover, they challenge the notion that simply increasing MOF pore size within a constant topology will lead to higher conversions.
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Affiliation(s)
- Vitalie Stavila
- Chemistry, Combustion, and Materials Center , Sandia National Laboratories , Livermore , California 94551 , USA . ;
| | - Michael E Foster
- Chemistry, Combustion, and Materials Center , Sandia National Laboratories , Livermore , California 94551 , USA . ;
| | - Jonathan W Brown
- Chemistry, Combustion, and Materials Center , Sandia National Laboratories , Livermore , California 94551 , USA . ;
| | - Ryan W Davis
- Chemistry, Combustion, and Materials Center , Sandia National Laboratories , Livermore , California 94551 , USA . ;
| | - Jane Edgington
- Chemistry, Combustion, and Materials Center , Sandia National Laboratories , Livermore , California 94551 , USA . ;
| | - Annabelle I Benin
- Chemistry, Combustion, and Materials Center , Sandia National Laboratories , Livermore , California 94551 , USA . ;
| | - Ryan A Zarkesh
- Chemistry, Combustion, and Materials Center , Sandia National Laboratories , Livermore , California 94551 , USA . ;
| | - Ramakrishnan Parthasarathi
- Chemistry, Combustion, and Materials Center , Sandia National Laboratories , Livermore , California 94551 , USA . ;
| | - David W Hoyt
- Environmental Molecular Sciences Laboratory , Pacific Northwest National Laboratory , Richland , Washington 99354 , USA
| | - Eric D Walter
- Environmental Molecular Sciences Laboratory , Pacific Northwest National Laboratory , Richland , Washington 99354 , USA
| | - Amity Andersen
- Environmental Molecular Sciences Laboratory , Pacific Northwest National Laboratory , Richland , Washington 99354 , USA
| | - Nancy M Washton
- Environmental Molecular Sciences Laboratory , Pacific Northwest National Laboratory , Richland , Washington 99354 , USA
| | - Andrew S Lipton
- Environmental Molecular Sciences Laboratory , Pacific Northwest National Laboratory , Richland , Washington 99354 , USA
| | - Mark D Allendorf
- Chemistry, Combustion, and Materials Center , Sandia National Laboratories , Livermore , California 94551 , USA . ;
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230
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Ryu GH, Zhu T, Chen J, Sinha S, Shautsova V, Grossman JC, Warner JH. Striated 2D Lattice with Sub-nm 1D Etch Channels by Controlled Thermally Induced Phase Transformations of PdSe 2. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1904251. [PMID: 31559669 DOI: 10.1002/adma.201904251] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 08/21/2019] [Indexed: 05/12/2023]
Abstract
2D crystals are typically uniform and periodic in-plane with stacked sheet-like structure in the out-of-plane direction. Breaking the in-plane 2D symmetry by creating unique lattice structures offers anisotropic electronic and optical responses that have potential in nanoelectronics. However, creating nanoscale-modulated anisotropic 2D lattices is challenging and is mostly done using top-down lithographic methods with ≈10 nm resolution. A phase transformation mechanism for creating 2D striated lattice systems is revealed, where controlled thermal annealing induces Se loss in few-layered PdSe2 and leads to 1D sub-nm etched channels in Pd2 Se3 bilayers. These striated 2D crystals cannot be described by a typical unit cells of 1-2 Å for crystals, but rather long range nanoscale periodicity in each three directions. The 1D channels give rise to localized conduction states, which have no bulk layered counterpart or monolayer form. These results show how the known family of 2D crystals can be extended beyond those that exist as bulk layered van der Waals crystals by exploiting phase transformations by elemental depletion in binary systems.
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Affiliation(s)
- Gyeong Hee Ryu
- Department of Materials, University of Oxford, 16 Parks Road, Oxford, OX1 3PH, UK
| | - Taishan Zhu
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Jun Chen
- Department of Materials, University of Oxford, 16 Parks Road, Oxford, OX1 3PH, UK
| | - Sapna Sinha
- Department of Materials, University of Oxford, 16 Parks Road, Oxford, OX1 3PH, UK
| | - Viktoryia Shautsova
- Department of Materials, University of Oxford, 16 Parks Road, Oxford, OX1 3PH, UK
| | - Jeffrey C Grossman
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Jamie H Warner
- Department of Materials, University of Oxford, 16 Parks Road, Oxford, OX1 3PH, UK
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231
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Understanding the interfacial interactions of bioinspired chitosan-calcite nanocomposites by first principles molecular dynamics simulations and experimental FT-IR spectroscopy. Carbohydr Polym 2019; 223:115054. [DOI: 10.1016/j.carbpol.2019.115054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 07/01/2019] [Accepted: 07/03/2019] [Indexed: 11/22/2022]
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232
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Brandenburg JG, Zen A, Alfè D, Michaelides A. Interaction between water and carbon nanostructures: How good are current density functional approximations? J Chem Phys 2019; 151:164702. [DOI: 10.1063/1.5121370] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Affiliation(s)
- Jan Gerit Brandenburg
- Interdisciplinary Center for Scientific Computing, University of Heidelberg, Im Neuenheimer Feld 205A, 69120 Heidelberg, Germany
| | - Andrea Zen
- Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, United Kingdom
- Thomas Young Centre and London Centre for Nanotechnology, 17-19 Gordon Street, London WC1H 0AH, United Kingdom
| | - Dario Alfè
- Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, United Kingdom
- Thomas Young Centre and London Centre for Nanotechnology, 17-19 Gordon Street, London WC1H 0AH, United Kingdom
- Dipartimento di Fisica Ettore Pancini, Università di Napoli Federico II, Monte S. Angelo, I-80126 Napoli, Italy
| | - Angelos Michaelides
- Thomas Young Centre and London Centre for Nanotechnology, 17-19 Gordon Street, London WC1H 0AH, United Kingdom
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
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233
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Tang Y, Li H, Mao X, Xie J, Lee JY, Fu A. Bidirectional heterostructures consisting of graphene and lateral MoS 2/WS 2 composites: a first-principles study. RSC Adv 2019; 9:34986-34994. [PMID: 35530718 PMCID: PMC9074164 DOI: 10.1039/c9ra05692k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 10/20/2019] [Indexed: 11/21/2022] Open
Abstract
First-principles calculations have been performed to explore the structural and electronic properties of bidirectional heterostructures composed of graphene and (MoS2) X /(WS2)4-X (X = 1, 2, 3) lateral composites and compare them with those of heterobilayers formed by graphene and pristine MS2 (M = Mo, W). The band gaps of the lateral heterostructures lie between those of pristine MoS2 and WS2. The weak coupling between the two layers can induce a tiny band-gap opening of graphene and formation of an n-type Schottky contact at the G-(MoS2) X /(WS2)4-X interface. Moreover, the combination ratio of MoS2/WS2 can control the electronic properties of G-(MoS2) X /(WS2)4-X . By applying external electric fields, the band gaps of (MoS2) X /(WS2)4-X (X = 0, 1, 2, 3, 4) monolayers undergo a direct-indirect transition, and semiconductor-metal transitions can be found in WS2. External electric fields can also be used effectively to tune the binding energies, charge transfers, and band structures (the types of Schottky and Ohmic contacts) of G-(MoS2) X /(WS2)4-X heterostructures. These findings suggest that G-(MoS2) X /(WS2)4-X heterostructures can serve as high-performance nano-electronic devices.
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Affiliation(s)
- Yingqi Tang
- College of Chemistry and Chemical Engineering, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University Qingdao 266071 China +86-531-85950768 +86-532-85950767
| | - Hao Li
- Department of Chemistry, Sungkyunkwan University Suwon 16419 Korea +82-031-290-7075 +82-031-299-4560
| | - Xiaotong Mao
- College of Chemistry and Chemical Engineering, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University Qingdao 266071 China +86-531-85950768 +86-532-85950767
| | - Ju Xie
- College of Chemistry and Chemical Engineering, Yangzhou University Yangzhou 225002 China
| | - Jin Yong Lee
- Department of Chemistry, Sungkyunkwan University Suwon 16419 Korea +82-031-290-7075 +82-031-299-4560
| | - Aiping Fu
- College of Chemistry and Chemical Engineering, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University Qingdao 266071 China +86-531-85950768 +86-532-85950767
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234
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Berche A, Jund P. Thermoelectric power factor of pure and doped ZnSb via DFT based defect calculations. Phys Chem Chem Phys 2019; 21:23056-23064. [PMID: 31599887 DOI: 10.1039/c9cp04397g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The power factor of pure p-type ZnSb has been calculated via ab initio simulations assuming that the carrier concentrations are due to the doping effect of intrinsic zinc vacancies. With a vacancy concentration close to the experimental solubility limit we were able to perfectly reproduce the Power Factor measured in polycrystalline ZnSb samples. The methodology has then been successfully extended for predicting the effect of extrinsic doping elements on the thermoelectric properties of ZnSb. Germanium and tin seem to be promising p-type doping elements. In addition, we give, for the first time, an explanation of why it is difficult to synthesize polycrystalline n-type ZnSb samples. Indeed, compensative effects between intrinsic defects (zinc vacancies) and doping elements (Ga, or In) explain the existence of an optimal (and relatively high) dopant concentration necessary to convert ZnSb into an n-type semiconductor.
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Affiliation(s)
- Alexandre Berche
- ICGM-Université de Montpellier, CNRS, ENSCM, UMR, 5253, Montpellier, France.
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235
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Schmidt J, Benavides-Riveros CL, Marques MAL. Machine Learning the Physical Nonlocal Exchange-Correlation Functional of Density-Functional Theory. J Phys Chem Lett 2019; 10:6425-6431. [PMID: 31596092 DOI: 10.1021/acs.jpclett.9b02422] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We train a neural network as the universal exchange-correlation functional of density-functional theory that simultaneously reproduces both the exact exchange-correlation energy and the potential. This functional is extremely nonlocal but retains the computational scaling of traditional local or semilocal approximations. It therefore holds the promise of solving some of the delocalization problems that plague density-functional theory, while maintaining the computational efficiency that characterizes the Kohn-Sham equations. Furthermore, by using automatic differentiation, a capability present in modern machine-learning frameworks, we impose the exact mathematical relation between the exchange-correlation energy and the potential, leading to a fully consistent method. We demonstrate the feasibility of our approach by looking at one-dimensional systems with two strongly correlated electrons, where density-functional methods are known to fail, and investigate the behavior and performance of our functional by varying the degree of nonlocality.
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Affiliation(s)
- Jonathan Schmidt
- Institut für Physik , Martin-Luther-Universität Halle-Wittenberg , 06120 Halle (Saale) , Germany
| | | | - Miguel A L Marques
- Institut für Physik , Martin-Luther-Universität Halle-Wittenberg , 06120 Halle (Saale) , Germany
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236
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Tangarife E, Romero AH, Mejía-López J. A charge optimized many-body potential for iron/iron-fluoride systems. Phys Chem Chem Phys 2019; 21:20118-20131. [PMID: 31482890 DOI: 10.1039/c9cp01927h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A classical interatomic potential for iron/iron-fluoride systems is developed in the framework of the charge optimized many-body (COMB) potential. This interatomic potential takes into consideration the effects of charge transfer and many-body interactions depending on the chemical environment. The potential is fitted to a training set composed of both experimental and ab initio results of the cohesive energies of several Fe and FeF2 crystal phases, the two fluorine molecules F2 and the F2-1 dissociation energy curve, the Fe and FeF2 lattice parameters of the ground state crystalline phase, and the elastic constants of the body centered cubic Fe structure. The potential is tested in an NVT ensemble for different initial structural configurations as the crystal ground state phases, F2 molecules, iron clusters, and iron nanospheres. In particular, we model the FeF2/Fe bilayer and multilayer interfaces, as well as a system of square FeF2 nanowires immersed in an iron solid. It has been shown that there exists a reordering of the atomic positions for F and Fe atoms at the interface zone; this rearrangement leads to an increase in the charge transfer among the atoms that make the interface and put forward a possible mechanism of the exchange bias origin based on asymmetric electric charge transfer in the different spin channels.
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Affiliation(s)
- E Tangarife
- Centro de Investigación en Nanotecnología y Materiales Avanzados CIEN-UC, Facultad de Física, Pontificia Universidad Católica de Chile, CEDENNA, Santiago, Chile.
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237
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Dong X, Wang M, Yan D, Peng X, Li J, Xiao W, Wang Q, Han J, Ma J, Shi Y, Yao Y. Observation of Topological Edge States at the Step Edges on the Surface of Type-II Weyl Semimetal TaIrTe 4. ACS NANO 2019; 13:9571-9577. [PMID: 31365228 DOI: 10.1021/acsnano.9b04573] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Topological materials harbor topologically protected boundary states. Recently, TaIrTe4, a ternary transition-metal dichalcogenide, was identified as a type-II Weyl semimetal with the minimal nonzero number of Weyl points allowed for a time-reversal invariant Weyl semimetal. Monolayer TaIrTe4 was proposed to host topological edge states, which, however, lacks of experimental evidence. Here, we report on the topological edge states localized at the monolayer step edges of the type-II Weyl semimetal TaIrTe4 using scanning tunneling microscopy. One-dimensional electronic states that show substantial robustness against the edge irregularity are observed at the step edges. Theoretical calculations substantiate the topologically nontrivial nature of the edge states and their robustness against the edge termination and layer stacking. The observation of topological edge states at the step edges of TaIrTe4 surfaces suggests that monolayer TaIrTe4 is a two-dimensional topological insulator, providing TaIrTe4 as a promising material for topological physics and devices.
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Affiliation(s)
- Xu Dong
- Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems and Micro-nano Centre, School of Physics , Beijing Institute of Technology , Beijing 100081 , China
| | - Maoyuan Wang
- Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems and Micro-nano Centre, School of Physics , Beijing Institute of Technology , Beijing 100081 , China
| | - Dayu Yan
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
| | - Xianglin Peng
- Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems and Micro-nano Centre, School of Physics , Beijing Institute of Technology , Beijing 100081 , China
| | - Ji Li
- Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems and Micro-nano Centre, School of Physics , Beijing Institute of Technology , Beijing 100081 , China
| | - Wende Xiao
- Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems and Micro-nano Centre, School of Physics , Beijing Institute of Technology , Beijing 100081 , China
| | - Qinsheng Wang
- Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems and Micro-nano Centre, School of Physics , Beijing Institute of Technology , Beijing 100081 , China
| | - Junfeng Han
- Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems and Micro-nano Centre, School of Physics , Beijing Institute of Technology , Beijing 100081 , China
| | - Jie Ma
- Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems and Micro-nano Centre, School of Physics , Beijing Institute of Technology , Beijing 100081 , China
| | - Youguo Shi
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
| | - Yugui Yao
- Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems and Micro-nano Centre, School of Physics , Beijing Institute of Technology , Beijing 100081 , China
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238
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Yao Y, Yost DC, Kanai Y. K-Shell Core-Electron Excitations in Electronic Stopping of Protons in Water from First Principles. PHYSICAL REVIEW LETTERS 2019; 123:066401. [PMID: 31491149 DOI: 10.1103/physrevlett.123.066401] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 04/17/2019] [Indexed: 06/10/2023]
Abstract
Understanding the role of core-electron excitation in liquid water under proton irradiation has become important due to the growing use of proton beams in radiation oncology. Using a first-principles, nonequilibrium simulation approach based on real-time, time-dependent density functional theory, we determine the electronic stopping power, the velocity-dependent energy transfer rate from irradiating ions to electrons. The electronic stopping power curve agrees quantitatively with experimental data over the velocity range available. At the same time, significant differences are observed between our first-principles result and commonly used perturbation theoretic models. Excitations of the water molecules' oxygen core electrons are a crucial factor in determining the electronic stopping power curve beyond its maximum. The core-electron contribution is responsible for as much as one third of the stopping power at the high proton velocity of 8.0 a.u. (1.6 MeV). K-shell core-electron excitations not only provide an additional channel for the energy transfer-they also significantly influence the valence electron excitations. In the excitation process, generated holes remain highly localized within a few angstroms around the irradiating proton path, whereas electrons are excited away from the path. In spite of their great contribution to the stopping power, K-shell electrons play a rather minor role in terms of the excitation density; only 1% of the hole population composes K-shell holes, even at the high proton velocity of 8.0 a.u. The excitation behavior revealed is distinctly different from that of photon-based ionizing radiation such as x or γ rays.
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Affiliation(s)
- Yi Yao
- Department of Chemistry, University of North Carolina at Chapel Hill, North Carolina 27599, USA
| | - Dillon C Yost
- Department of Chemistry, University of North Carolina at Chapel Hill, North Carolina 27599, USA
| | - Yosuke Kanai
- Department of Chemistry, University of North Carolina at Chapel Hill, North Carolina 27599, USA
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239
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Chen PP, Zhang BY, Gu XK, Lic WX. Ethylene adsorption on Ag(111), Rh(111) and Ir(111) by (meta)-GGA based density functional theory calculations. CHINESE J CHEM PHYS 2019. [DOI: 10.1063/1674-0068/cjcp1902035] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Pei-pei Chen
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Bing-yan Zhang
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiang-kui Gu
- Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA
| | - Wei-xue Lic
- Department of Chemical Physics, College of Chemistry and Materials Science, University of Science and Technology of China, Hefei National Laboratory for Physical Sciences at the Microscale, Hefei 230026, China
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240
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Zhang T, Yang X, Ge Q. Surface chemistry and reactivity of α-MoO3 toward methane: A SCAN-functional based DFT study. J Chem Phys 2019; 151:044708. [DOI: 10.1063/1.5113787] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Tianyu Zhang
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, Illinois 62901, USA
| | - Xiaofeng Yang
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, Illinois 62901, USA
| | - Qingfeng Ge
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, Illinois 62901, USA
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241
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Chen Z, Li Y, He Z, Xu Y, Yu W. Theoretical investigations on charge transport properties of tetrabenzo[a,d,j,m]coronene derivatives using different density functional theory functionals (B3LYP, M06-2X, and wB97XD). JOURNAL OF CHEMICAL RESEARCH 2019. [DOI: 10.1177/1747519819861626] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Charge transport rate is one of the key parameters determining the performance of organic electronic devices. Based on density functional theory, exchange-correlation functionals which adequately account for non-covalent interactions, such as M06-2X and wB97XD, should significantly improve the accuracy of charge transport rate calculations for large systems with non-covalent interactions. In this work, the B3LYP hybrid functional, the variant hybrid functional M06-2X, and the long-range-corrected wB97XD functional were used to perform geometry optimizations and charge transport rate calculations on 11 variants of tetrabenzo[ a,d,j,m]coronene, including tetrabenzo[ a,d,j,m]coronene itself and its tetra-substituted and octa-substituted derivatives. Our results indicate that the molecular geometries of these benzocoronene semiconductors are large quasi-planar conjugated π systems, and the incorporation of different substituents significantly affects their frontier molecular orbitals. The hole carrier mobility ( µ+) and electron carrier mobility ( µ−) of the methoxy-substituted derivatives (TBC(OCH3)4and TBC(OCH3)8) were relatively low. The results of the tetrabenzo[ a,d,j,m]coronene molecules studied were consistent with using the aforementioned M06-2X, wB97XD, and B3LYP methods. We found that the octa-substituted derivatives (TBCF8, TBCCl8, TBC(CH3)8, and TBC(CN)8) could be used as p-type organic semiconductor materials.
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Affiliation(s)
- Ziran Chen
- Department of Architecture and Environment Engineering, Sichuan Vocational and Technical College, Suining, China
| | - Yuan Li
- Department of Architecture and Environment Engineering, Sichuan Vocational and Technical College, Suining, China
| | - Zhanrong He
- Department of Architecture and Environment Engineering, Sichuan Vocational and Technical College, Suining, China
| | - Youhui Xu
- Department of Architecture and Environment Engineering, Sichuan Vocational and Technical College, Suining, China
| | - Wenhao Yu
- College of Chemistry and Material Science, Sichuan Normal University, Chengdu, China
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242
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Remsing RC, Klein ML. Halogen Bond Structure and Dynamics from Molecular Simulations. J Phys Chem B 2019; 123:6266-6273. [PMID: 31266300 DOI: 10.1021/acs.jpcb.9b04820] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Halogen bonding has emerged as an important noncovalent interaction in a myriad of applications, including drug design, supramolecular assembly, and catalysis. The current understanding of the halogen bond is informed by electronic structure calculations on isolated molecules and/or crystal structures that are not readily transferable to liquids and disordered phases. To address this issue, we present a first-principles simulation-based approach for quantifying halogen bonds in molecular systems rooted in an understanding of nuclei-nuclei and electron-nuclei spatial correlations. We then demonstrate how this approach can be used to quantify the structure and dynamics of halogen bonds in condensed phases, using solid and liquid molecular chlorine as prototypical examples with high concentrations of halogen bonds. We close with a discussion of how the knowledge generated by our first-principles approach may inform the development of classical empirical models, with a consistent representation of halogen bonding.
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Affiliation(s)
- Richard C Remsing
- Institute for Computational Molecular Science and Department of Chemistry , Temple University , Philadelphia , Pennsylvania 19122 , United States
| | - Michael L Klein
- Institute for Computational Molecular Science and Department of Chemistry , Temple University , Philadelphia , Pennsylvania 19122 , United States
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243
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Ammal SC, Heyden A. Understanding the Nature and Activity of Supported Platinum Catalysts for the Water–Gas Shift Reaction: From Metallic Nanoclusters to Alkali-Stabilized Single-Atom Cations. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01560] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Salai Cheettu Ammal
- Department of Chemical Engineering, University of South Carolina, 301 South Main Street, Columbia, South Carolina 29208, United States
| | - Andreas Heyden
- Department of Chemical Engineering, University of South Carolina, 301 South Main Street, Columbia, South Carolina 29208, United States
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244
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Liu Y, Huang Y, Zhu C, Li H, Zhao J, Wang L, Ojamäe L, Francisco JS, Zeng XC. An ultralow-density porous ice with the largest internal cavity identified in the water phase diagram. Proc Natl Acad Sci U S A 2019; 116:12684-12691. [PMID: 31182582 PMCID: PMC6600908 DOI: 10.1073/pnas.1900739116] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The recent back-to-back findings of low-density porous ice XVI and XVII have rekindled the century-old field of the solid-state physics and chemistry of water. Experimentally, both ice XVI and XVII crystals can be produced by extracting guest atoms or molecules enclosed in the cavities of preformed ice clathrate hydrates. Herein, we examine more than 200 hypothetical low-density porous ices whose structures were generated according to a database of zeolite structures. Hitherto unreported porous EMT ice, named according to zeolite nomenclature, is identified to have an extremely low density of 0.5 g/cm3 and the largest internal cavity (7.88 Å in average radius). The EMT ice can be viewed as dumbbell-shaped motifs in a hexagonal close-packed structure. Our first-principles computations and molecular dynamics simulations confirm that the EMT ice is stable under negative pressures and exhibits higher thermal stability than other ultralow-density ices. If all cavities are fully occupied by hydrogen molecules, the EMT ice hydrate can easily outperform the record hydrogen storage capacity of 5.3 wt % achieved with sII hydrogen hydrate. Most importantly, in the reconstructed temperature-pressure (T-P) phase diagram of water, the EMT ice is located at deeply negative pressure regions below ice XVI and at higher temperature regions next to FAU. Last, the phonon spectra of empty-sII, FAU, EMT, and other zeolite-like ice structures are computed by using the dispersion corrected vdW-DF2 functional. Compared with those of ice XI (0.93 g/cm3), both the bending and stretching vibrational modes of the EMT ice are blue-shifted due to their weaker hydrogen bonds.
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Affiliation(s)
- Yuan Liu
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, 100029 Beijing, China
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588
| | - Yingying Huang
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, 201210 Shanghai, China
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Ministry of Education, 116024 Dalian, China
| | - Chongqin Zhu
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588
- Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA 19104-6316
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6316
| | - Hui Li
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, 100029 Beijing, China
| | - Jijun Zhao
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Ministry of Education, 116024 Dalian, China
| | - Lu Wang
- Collaborative Innovation Center of Chemistry for Energy Materials, Department of Materials Science and Engineering, University of Science and Technology of China, 230026 Hefei, China;
| | - Lars Ojamäe
- Department of Physics, Chemistry, and Biology, Linköping University, SE-58 183 Linköping, Sweden
| | - Joseph S Francisco
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588;
- Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA 19104-6316
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6316
| | - Xiao Cheng Zeng
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, 100029 Beijing, China;
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588
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245
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Rasti S, Meyer J. Importance of zero-point energy for crystalline ice phases: A comparison of force fields and density functional theory. J Chem Phys 2019; 150:234504. [DOI: 10.1063/1.5097021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Affiliation(s)
- Soroush Rasti
- Gorlaeus Laboratories, Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Jörg Meyer
- Gorlaeus Laboratories, Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
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246
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Chen D, Zhang G, Sun W, Li J, Cheng Z, Wang Y. Tuning the magnetism of two-dimensional hematene by ferroelectric polarization. Phys Chem Chem Phys 2019; 21:12301-12309. [PMID: 31139776 DOI: 10.1039/c9cp01981b] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Magnetism in two-dimensional (2D) materials, that is, a 2D version of the magnetism of three-dimensional bulk materials, and the associated novel physics have recently been the focus of many spintronics researchers. Here we investigate the manipulation of 2D magnetism at the interfaces of ferromagnetic/ferroelectric hematene/BaTiO3(001) heterostructures (HSs) fabricated via a precisely chosen sequence. By introducing four types of interfaces of 2D hematene and three-dimensional BaTiO3 that induce different oxygen environments, the control of magnetism is directly demonstrated from first-principles. An obvious 2D electron gas originates from the Fe-3d and O-2p hybridization; the electron gas is sensitive to the interfacial atomic displacements. Robust control of both the direction and magnitude of the net magnetization has been realized for an Fe/TiO2 terminated bilayer HS. The electron occupancies of the dxy and dxz orbitals and changes to the Fe-O bond play a key role in determining the magnetism of our systems. Our work not only demonstrates the technique's potential for manipulating magnetism in 2D hematene, but also sheds light on the underlying mechanism and the fundamental properties of hematene HSs.
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Affiliation(s)
- Dong Chen
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng, 475004, P. R. China. and College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang, 464000, P. R. China
| | - Guangbiao Zhang
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng, 475004, P. R. China.
| | - Wei Sun
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng, 475004, P. R. China.
| | - Jingyu Li
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng, 475004, P. R. China.
| | - Zhenxiang Cheng
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng, 475004, P. R. China. and Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, NSW 2500, Australia.
| | - Yuanxu Wang
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng, 475004, P. R. China.
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247
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Lian C, Ali ZA, Kwon H, Wong BM. Indirect but Efficient: Laser-Excited Electrons Can Drive Ultrafast Polarization Switching in Ferroelectric Materials. J Phys Chem Lett 2019; 10:3402-3407. [PMID: 31181930 DOI: 10.1021/acs.jpclett.9b01046] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
To enhance the efficiency of next-generation ferroelectric (FE) electronic devices, new techniques for controlling ferroelectric polarization switching are required. While most prior studies have attempted to induce polarization switching via the excitation of phonons, these experimental techniques required intricate and expensive terahertz sources and have not been completely successful. Here, we propose a new mechanism for rapidly and efficiently switching the FE polarization via laser-tuning of the underlying dynamical potential energy surface. Using time-dependent density functional calculations, we observe an ultrafast switching of the FE polarization in BaTiO3 within 200 fs. A laser pulse can induce a charge density redistribution that reduces the original FE charge order. This excitation results in both desirable and highly directional ionic forces that are always opposite to the original FE displacements. Our new mechanism enables the reversible switching of the FE polarization with optical pulses that can be produced from existing 800 nm experimental laser sources.
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Affiliation(s)
- Chao Lian
- Department of Chemical & Environmental Engineering, Materials Science & Engineering Program, and Department of Physics & Astronomy , University of California-Riverside , Riverside , California 92521 , United States
| | - Zulfikhar A Ali
- Department of Chemical & Environmental Engineering, Materials Science & Engineering Program, and Department of Physics & Astronomy , University of California-Riverside , Riverside , California 92521 , United States
| | - Hyuna Kwon
- Department of Chemical & Environmental Engineering, Materials Science & Engineering Program, and Department of Physics & Astronomy , University of California-Riverside , Riverside , California 92521 , United States
| | - Bryan M Wong
- Department of Chemical & Environmental Engineering, Materials Science & Engineering Program, and Department of Physics & Astronomy , University of California-Riverside , Riverside , California 92521 , United States
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248
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Ning J, Furness JW, Zhang Y, Thenuwara AC, Remsing RC, Klein ML, Strongin DR, Sun J. Tunable catalytic activity of cobalt-intercalated layered MnO2 for water oxidation through confinement and local ordering. J Catal 2019. [DOI: 10.1016/j.jcat.2019.04.037] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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249
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Wang M, John D, Yu J, Proynov E, Liu F, Janesko BG, Kong J. Performance of new density functionals of nondynamic correlation on chemical properties. J Chem Phys 2019; 150:204101. [DOI: 10.1063/1.5082745] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Matthew Wang
- Department of Chemistry and Center for Computational Sciences, Middle Tennessee State University, Murfreesboro, Tennessee 37132, USA
| | - Dwayne John
- Department of Chemistry and Center for Computational Sciences, Middle Tennessee State University, Murfreesboro, Tennessee 37132, USA
| | - Jianguo Yu
- Department of Chemistry and Center for Computational Sciences, Middle Tennessee State University, Murfreesboro, Tennessee 37132, USA
| | - Emil Proynov
- Department of Chemistry and Center for Computational Sciences, Middle Tennessee State University, Murfreesboro, Tennessee 37132, USA
| | - Fenglai Liu
- Department of Chemistry and Center for Computational Sciences, Middle Tennessee State University, Murfreesboro, Tennessee 37132, USA
| | - Benjamin G. Janesko
- Department of Chemistry, Texas Christian University, Fort Worth, Texas 76129, USA
| | - Jing Kong
- Department of Chemistry and Center for Computational Sciences, Middle Tennessee State University, Murfreesboro, Tennessee 37132, USA
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250
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Lou P, Lee JY. Origin of structural stability of ScH 3 molecular nanowires and their chemical-bonding behavior: Correlation effects of the Sc 3d electrons. J Chem Phys 2019; 150:184307. [PMID: 31091917 DOI: 10.1063/1.5093446] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
A new stable transition-metal trihydride (ScH3) molecular nanowire was recently reported by Li et al. [J. Am. Chem. Soc. 139, 6290-6293 (2017)]. Of the two typical structures (T-ScH3 and O-ScH3), T-ScH3 is more stable than O-ScH3. However, the reason why O-ScH3 is less stable than T-ScH3 was not known. Using Perdew-Burke-Ernzerhof (PBE), PBE+U, SCAN, and HSE06, as well as crystal orbital Hamilton populations (COHPs), we investigate the orbital-projected band structures and chemical bonding of T-ScH3 and O-ScH3. It is found that the energies calculated by PBE, SCAN, and HSE06 indeed reveal that T-ScH3 is more stable than O-ScH3, and there is no occupied antibonding state at the Fermi level of the COHP curves of T-ScH3, supporting the stable Sc-H bonding of T-ScH3. To the contrary, the Sc-H bonding of O-ScH3 is unstable because there exist occupied antibonding states at the Fermi level of the COHP curves of O-ScH3. We found that the results of PBE+U are consistent with those of PBE, SCAN, and HSE06 in the case of U < Uc. However, when U > Uc, the results of PBE+U are opposite to those of PBE, SCAN, and HSE06.
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Affiliation(s)
- Ping Lou
- Department of Chemistry, Sungkyunkwan University, Suwon 440-746, South Korea
| | - Jin Yong Lee
- Department of Chemistry, Sungkyunkwan University, Suwon 440-746, South Korea
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