201
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Price DL, Borodin O, González MA, Kofu M, Shibata K, Yamada T, Yamamuro O, Saboungi ML. Relaxation in a Prototype Ionic Liquid: Influence of Water on the Dynamics. J Phys Chem Lett 2017; 8:715-719. [PMID: 28103664 DOI: 10.1021/acs.jpclett.6b02871] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The influence of water on the relaxation of a prototype ionic liquid (IL) C8mimBF4 is examined in the IL-rich regime combining quasi-elastic neutron scattering (QENS) and molecular dynamics (MD) simulations. The QENS and MD simulations results for relaxation of IL and the equimolar mixture with water probed by the dynamics of the C8mim hydrogen atoms in the time range of 2 ps to 1 ns are in excellent agreement. The QENS data show that translational relaxation increases by a factor of 7 on the addition of water, while rotational relaxation involving multiple processes fitted by a KWW function with low β values is speeded up by a factor of 3 on the time scale of QENS measurements. The MD simulations show that the cation diffusion coefficient, inverse viscosity, and ionic conductivity increase on the addition of water, consistent with the very small change in ionicity. The difficulties in obtaining rotational and translational diffusion coefficients from fits to QENS experiments of pure ILs and IL-water mixtures are discussed.
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Affiliation(s)
- David L Price
- CNRS, UPR 3079 and Université d'Orléans, Conditions Extrêmes et Matériaux: Haute Température et Irradiation, 1d avenue de la recherche scientifique, 45071 Orléans Cedex 2, France
| | - Oleg Borodin
- Electrochemistry Branch, Sensor and Electron Devices Directorate, U.S. Army Research Laboratory , Adelphi, Maryland 20783, United States
| | - Miguel A González
- Institut Laue Langevin , 71 avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Maiko Kofu
- Institute for Solid State Physics, University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Kaoru Shibata
- Materials and Life Science Division, J-PARC Center, JAEA , Tokai, Ibaraki 319-1195, Japan
| | - Takeshi Yamada
- Neutron R&D Division, CROSS-Tokai , Tokai, Ibaraki 319-1106, Japan
| | - Osamu Yamamuro
- Institute for Solid State Physics, University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Marie-Louise Saboungi
- IMPMC-Université Pierre et Marie Curie and CNRS , 4 Place Jussieu, F-75252 Paris, France
- Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou, Jiangsu 215123, China
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202
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Izgorodina EI, Seeger ZL, Scarborough DLA, Tan SYS. Quantum Chemical Methods for the Prediction of Energetic, Physical, and Spectroscopic Properties of Ionic Liquids. Chem Rev 2017; 117:6696-6754. [PMID: 28139908 DOI: 10.1021/acs.chemrev.6b00528] [Citation(s) in RCA: 125] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The accurate prediction of physicochemical properties of condensed systems is a longstanding goal of theoretical (quantum) chemistry. Ionic liquids comprising entirely of ions provide a unique challenge in this respect due to the diverse chemical nature of available ions and the complex interplay of intermolecular interactions among them, thus resulting in the wide variability of physicochemical properties, such as thermodynamic, transport, and spectroscopic properties. It is well understood that intermolecular forces are directly linked to physicochemical properties of condensed systems, and therefore, an understanding of this relationship would greatly aid in the design and synthesis of functionalized materials with tailored properties for an application at hand. This review aims to give an overview of how electronic structure properties obtained from quantum chemical methods such as interaction/binding energy and its fundamental components, dipole moment, polarizability, and orbital energies, can help shed light on the energetic, physical, and spectroscopic properties of semi-Coulomb systems such as ionic liquids. Particular emphasis is given to the prediction of their thermodynamic, transport, spectroscopic, and solubilizing properties.
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Affiliation(s)
- Ekaterina I Izgorodina
- Monash Computational Chemistry Group, School of Chemistry, Monash University , 17 Rainforest Walk, Clayton, Victoria 3800, Australia
| | - Zoe L Seeger
- Monash Computational Chemistry Group, School of Chemistry, Monash University , 17 Rainforest Walk, Clayton, Victoria 3800, Australia
| | - David L A Scarborough
- Monash Computational Chemistry Group, School of Chemistry, Monash University , 17 Rainforest Walk, Clayton, Victoria 3800, Australia
| | - Samuel Y S Tan
- Monash Computational Chemistry Group, School of Chemistry, Monash University , 17 Rainforest Walk, Clayton, Victoria 3800, Australia
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203
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Awoonor-Williams E, Rowley CN. The hydration structure of carbon monoxide byab initiomethods. J Chem Phys 2017; 146:034503. [DOI: 10.1063/1.4974164] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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204
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Yu Z, He Y, Wang Y, Madsen LA, Qiao R. Molecular Structure and Dynamics of Ionic Liquids in a Rigid-Rod Polyanion-Based Ion Gel. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:322-331. [PMID: 27997204 DOI: 10.1021/acs.langmuir.6b03798] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The recent fabrication of liquid crystalline ion gels featuring rigid-rod polyanions aligned within room-temperature ionic liquids (RTILs) opens up exciting new avenues for engineering ion conducting materials. These gels exhibit an unusual combination of properties including high ionic conductivity, distinct transport anisotropy, and widely tunable elastic modulus. Using molecular simulations, we study the structure and dynamics of the ions in an ion gel consisting of rigid-rod polyanions and [C2mim][TfO] RTILs. We show that the ion distribution in the interstitial space between polymer rods exhibits the hallmarks of the RTIL structure near charged surfaces; i.e., cations (C2mim+) and anions (TfO-) form alternating layers around the polymer rods and the charge on the rod is overscreened by the ionic layer surrounding it. The distinct ordering of ions suggests the formation of a long-range "electrostatic network" in the ion gel, which may contribute to its mechanical cohesion and high modulus. The dynamics of both C2mim+ and TfO- ions slow down due to the fact that some C2mim+ ions become associated with the sulfonate groups of the polymer rod on nanosecond time scales, which hinders the dynamics of all ions in the gel. C2mim+ and TfO- ion diffusion in the gel are only 2-10 times slower than in bulk RTILs, which is still much faster than, e.g., Li ions in typical ion conducting polymers. This fast ion transport combined with strong mechanical cohesion open up exciting opportunities for application of these gels in electrochemical devices including Li-metal batteries.
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Affiliation(s)
- Zhou Yu
- Department of Mechanical Engineering and ‡Department of Chemistry and Macromolecules Innovation Institute, Virginia Tech , Blacksburg, Virginia 24061, United States
| | - Yadong He
- Department of Mechanical Engineering and ‡Department of Chemistry and Macromolecules Innovation Institute, Virginia Tech , Blacksburg, Virginia 24061, United States
| | - Ying Wang
- Department of Mechanical Engineering and ‡Department of Chemistry and Macromolecules Innovation Institute, Virginia Tech , Blacksburg, Virginia 24061, United States
| | - Louis A Madsen
- Department of Mechanical Engineering and ‡Department of Chemistry and Macromolecules Innovation Institute, Virginia Tech , Blacksburg, Virginia 24061, United States
| | - Rui Qiao
- Department of Mechanical Engineering and ‡Department of Chemistry and Macromolecules Innovation Institute, Virginia Tech , Blacksburg, Virginia 24061, United States
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205
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Abstract
Vibrational spectroscopy has continued use as a powerful tool to characterize ionic liquids since the literature on room temperature molten salts experienced the rapid increase in number of publications in the 1990's. In the past years, infrared (IR) and Raman spectroscopies have provided insights on ionic interactions and the resulting liquid structure in ionic liquids. A large body of information is now available concerning vibrational spectra of ionic liquids made of many different combinations of anions and cations, but reviews on this literature are scarce. This review is an attempt at filling this gap. Some basic care needed while recording IR or Raman spectra of ionic liquids is explained. We have reviewed the conceptual basis of theoretical frameworks which have been used to interpret vibrational spectra of ionic liquids, helping the reader to distinguish the scope of application of different methods of calculation. Vibrational frequencies observed in IR and Raman spectra of ionic liquids based on different anions and cations are discussed and eventual disagreements between different sources are critically reviewed. The aim is that the reader can use this information while assigning vibrational spectra of an ionic liquid containing another particular combination of anions and cations. Different applications of IR and Raman spectroscopies are given for both pure ionic liquids and solutions. Further issues addressed in this review are the intermolecular vibrations that are more directly probed by the low-frequency range of IR and Raman spectra and the applications of vibrational spectroscopy in studying phase transitions of ionic liquids.
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Affiliation(s)
- Vitor H Paschoal
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes 748, São Paulo 05508-000, Brazil
| | - Luiz F O Faria
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes 748, São Paulo 05508-000, Brazil
| | - Mauro C C Ribeiro
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes 748, São Paulo 05508-000, Brazil
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206
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Tang F, Ohto T, Hasegawa T, Bonn M, Nagata Y. π+–π+ stacking of imidazolium cations enhances molecular layering of room temperature ionic liquids at their interfaces. Phys Chem Chem Phys 2017; 19:2850-2856. [DOI: 10.1039/c6cp07034e] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interfacial structure of room temperature ionic liquids (RTILs) is governed by the competing effects of the randomization due to the molecular polarizability and the ordered structure stabilized by π+–π+ interactions between the cationic molecules of RTILs.
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Affiliation(s)
- Fujie Tang
- International Center for Quantum Materials
- Peking University
- Beijing 100871
- China
- Max-Planck Institute for Polymer Research
| | - Tatsuhiko Ohto
- Graduate School of Engineering Science
- Osaka University
- Toyonaka
- Japan
| | - Taisuke Hasegawa
- Department of Chemistry
- Graduate School of Science
- Kyoto University
- Kyoto 606-8502
- Japan
| | - Mischa Bonn
- Max-Planck Institute for Polymer Research
- Mainz
- Germany
| | - Yuki Nagata
- Max-Planck Institute for Polymer Research
- Mainz
- Germany
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207
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Starovoytov ON, Zhang P, Cieplak P, Cheung MS. Induced polarization restricts the conformational distribution of a light-harvesting molecular triad in the ground state. Phys Chem Chem Phys 2017; 19:22969-22980. [DOI: 10.1039/c7cp03177g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Free energy surface of the light-harvesting triad employing a non-polarizable force field (NFF) and a polarizable force field (PFF) shows that induced polarization limits the motion of rotation about chemical bonds as well as bending at the porphyrin, which are prominent using the NFF, thus limiting the conformational space of the triad.
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Affiliation(s)
| | - Pengzhi Zhang
- Department of Physics
- University of Houston
- Houston
- USA
| | - Piotr Cieplak
- Sanford Burnham Prebys Medical Discovery Institute
- La Jolla
- USA
| | - Margaret S. Cheung
- Department of Physics
- University of Houston
- Houston
- USA
- Center for Theoretical Biological Physics
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208
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Wu M, Li W, Li S, Feng G. Capacitive performance of amino acid ionic liquid electrolyte-based supercapacitors by molecular dynamics simulation. RSC Adv 2017. [DOI: 10.1039/c7ra00443e] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Capacitance–electric potential curves of amino acid ionic liquid electrolyte-based supercapacitors.
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Affiliation(s)
- Mingbing Wu
- State Key Laboratory of Coal Combustion
- School of Energy and Power Engineering
- Huazhong University of Science and Technology
- China
- Shenzhen Research Institute of Huazhong University of Science and Technology
| | - Wei Li
- State Key Laboratory of Coal Combustion
- School of Energy and Power Engineering
- Huazhong University of Science and Technology
- China
- Shenzhen Research Institute of Huazhong University of Science and Technology
| | - Song Li
- State Key Laboratory of Coal Combustion
- School of Energy and Power Engineering
- Huazhong University of Science and Technology
- China
- Shenzhen Research Institute of Huazhong University of Science and Technology
| | - Guang Feng
- State Key Laboratory of Coal Combustion
- School of Energy and Power Engineering
- Huazhong University of Science and Technology
- China
- Nano Interface Centre for Energy
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209
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Blach D, Martínez O. F. Gold nanoparticles optical properties induced by water and an ionic liquid (bmimBF4) inside cationic reverse micelles. NEW J CHEM 2017. [DOI: 10.1039/c7nj01106g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polar solvent interactions at the interface are a key factor affecting the final properties of nanoparticles, including size, shape and crystallinity.
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Affiliation(s)
- Diana Blach
- Centro de Investigaciones en Catálisis - CICAT, Universidad Industrial de Santander, Escuela de Química
- Piedecuesta
- Colombia
| | - Fernando Martínez O.
- Centro de Investigaciones en Catálisis - CICAT, Universidad Industrial de Santander, Escuela de Química
- Piedecuesta
- Colombia
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210
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Wu B, Yamashita Y, Endo T, Takahashi K, Castner EW. Structure and dynamics of ionic liquids: Trimethylsilylpropyl-substituted cations and bis(sulfonyl)amide anions. J Chem Phys 2016; 145:244506. [DOI: 10.1063/1.4972410] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Boning Wu
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA
| | - Yuki Yamashita
- Institute of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Takatsugu Endo
- Institute of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Kenji Takahashi
- Institute of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Edward W. Castner
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA
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211
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Lesch V, Montes-Campos H, Méndez-Morales T, Gallego LJ, Heuer A, Schröder C, Varela LM. Molecular dynamics analysis of the effect of electronic polarization on the structure and single-particle dynamics of mixtures of ionic liquids and lithium salts. J Chem Phys 2016; 145:204507. [DOI: 10.1063/1.4968393] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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212
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Vatamanu J, Vatamanu M, Borodin O, Bedrov D. A comparative study of room temperature ionic liquids and their organic solvent mixtures near charged electrodes. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:464002. [PMID: 27623976 DOI: 10.1088/0953-8984/28/46/464002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The structural properties of electrolytes consisting of solutions of ionic liquids in a polar solvent at charged electrode surfaces are investigated using classical atomistic simulations. The studied electrolytes consisted of tetraethylammonium tetrafluoroborate (NEt4-BF4), 1-ethyl-3-methylimidazolium tetrafluoroborate (c2mim-BF4) and 1-octyl-3-methylimidazolium tetrafluoroborate (c8mim-BF4) salts dissolved in acetonitrile solvent. We discuss the influence of electrolyte concentration, chemical structure of the ionic salt, temperature, conducting versus semiconducting nature of the electrode, electrode geometry and surface roughness on the electric double layer structure and capacitance and compare these properties with those obtained for pure room temperature ionic liquids. We show that electrolytes consisting of solutions of ions can behave quite differently from pure ionic liquid electrolytes.
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Affiliation(s)
- Jenel Vatamanu
- University of Utah, MSE Department, Salt Lake City, UT 84112, USA
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213
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Ramírez-González PE, Sanchéz-Díaz LE, Medina-Noyola M, Wang Y. Communication: Probing the existence of partially arrested states in ionic liquids. J Chem Phys 2016; 145:191101. [DOI: 10.1063/1.4967518] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Affiliation(s)
- Pedro E. Ramírez-González
- CONACYT - Instituto de Física “Manuel Sandoval Vallarta,” Universidad Autónoma de San Luis Potosí, Álvaro Obregón 64, 78000 San Luis Potosí, SLP, Mexico
| | - Luis E. Sanchéz-Díaz
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Magdaleno Medina-Noyola
- Instituto de Física “Manuel Sandoval Vallarta,” Universidad Autónoma de San Luis Potosí, Álvaro Obregón 64, 78000 San Luis Potosí, SLP, Mexico
| | - Yanting Wang
- State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 55 East Zhongguancun Road, P.O. Box 2735, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China
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214
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Heid E, Harringer S, Schröder C. The small impact of various partial charge distributions in ground and excited state on the computational Stokes shift of 1-methyl-6-oxyquinolinium betaine in diverse water models. J Chem Phys 2016; 145:164506. [DOI: 10.1063/1.4966147] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
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215
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Eilmes A, Kubisiak P, Brela M. Explicit Solvent Modeling of IR and UV–Vis Spectra of 1-Ethyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide Ionic Liquid. J Phys Chem B 2016; 120:11026-11034. [DOI: 10.1021/acs.jpcb.6b07994] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Andrzej Eilmes
- Faculty of Chemistry, Jagiellonian University, Ingardena
3, 30-060 Kraków, Poland
| | - Piotr Kubisiak
- Faculty of Chemistry, Jagiellonian University, Ingardena
3, 30-060 Kraków, Poland
| | - Mateusz Brela
- Faculty of Chemistry, Jagiellonian University, Ingardena
3, 30-060 Kraków, Poland
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216
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Kowsari MH, Tohidifar L. Tracing Dynamics, Self-Diffusion, and Nanoscale Structural Heterogeneity of Pure and Binary Mixtures of Ionic Liquid 1-Hexyl-2,3-dimethylimidazolium Bis(fluorosulfonyl)imide with Acetonitrile: Insights from Molecular Dynamics Simulations. J Phys Chem B 2016; 120:10824-10838. [DOI: 10.1021/acs.jpcb.6b08396] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mohammad H. Kowsari
- Department
of Chemistry and
Center for Research in Climate Change and Global Warming (CRCC), Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran
| | - Leila Tohidifar
- Department
of Chemistry and
Center for Research in Climate Change and Global Warming (CRCC), Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran
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217
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Protein remains stable at unusually high temperatures when solvated in aqueous mixtures of amino acid based ionic liquids. J Mol Model 2016; 22:258. [DOI: 10.1007/s00894-016-3123-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2016] [Accepted: 09/08/2016] [Indexed: 10/20/2022]
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218
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Schröder C, Steinhauser O. Charged, dipolar soft matter systems from a combined microscopic-mesoscopic viewpoint. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:344008. [PMID: 27376788 DOI: 10.1088/0953-8984/28/34/344008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
As an example of charged, dipolar soft matter, the ionic liquid 1-ethyl-3-methyl-imidazolium dicyanamide is studied by coarse-grained molecular dynamics simulations. We focus on the link between microscopic and mesoscopic properties for both structure and dynamics. Thereby, the generalized Kirkwood g K-factor plays a central role in establishing this link which is not possible on the basis of molecular hydrodynamics. The decoupling between translational and rotational motion is indicative of the dynamical heterogeneity in ionic liquids.
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Affiliation(s)
- Christian Schröder
- Department of Computational Biological Chemistry, Währingerstr. 17, A-1090 Vienna, Austria
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219
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Moultos OA, Zhang Y, Tsimpanogiannis IN, Economou IG, Maginn EJ. System-size corrections for self-diffusion coefficients calculated from molecular dynamics simulations: The case of CO2, n-alkanes, and poly(ethylene glycol) dimethyl ethers. J Chem Phys 2016; 145:074109. [DOI: 10.1063/1.4960776] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
- Othonas A. Moultos
- Chemical Engineering Program, Texas A&M University at Qatar, P.O. Box 23847, Doha, Qatar
| | - Yong Zhang
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - Ioannis N. Tsimpanogiannis
- Chemical Engineering Program, Texas A&M University at Qatar, P.O. Box 23847, Doha, Qatar
- Environmental Research Laboratory, National Center for Scientific Research “Demokritos,” 15310 Aghia Paraskevi Attikis, Greece
| | - Ioannis G. Economou
- Chemical Engineering Program, Texas A&M University at Qatar, P.O. Box 23847, Doha, Qatar
| | - Edward J. Maginn
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA
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220
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Saielli G, Wang Y. Role of the Electrostatic Interactions in the Stabilization of Ionic Liquid Crystals: Insights from Coarse-Grained MD Simulations of an Imidazolium Model. J Phys Chem B 2016; 120:9152-60. [DOI: 10.1021/acs.jpcb.6b04717] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Giacomo Saielli
- CNR
Institute on Membrane Technology, Unit of Padova and Department of
Chemical Sciences, University of Padova, Via Marzolo, 1-35131 Padova, Italy
| | - Yanting Wang
- CAS
Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 55 East Zhongguancun Road, P.O.
Box 2735, Beijing, 100190, China
- School
of Physical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China
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221
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McDaniel JG, Choi E, Son CY, Schmidt JR, Yethiraj A. Ab Initio Force Fields for Imidazolium-Based Ionic Liquids. J Phys Chem B 2016; 120:7024-36. [DOI: 10.1021/acs.jpcb.6b05328] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jesse G. McDaniel
- Department of Chemistry and ‡Department of Physics, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
| | - Eunsong Choi
- Department of Chemistry and ‡Department of Physics, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
| | - Chang Yun Son
- Department of Chemistry and ‡Department of Physics, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
| | - J. R. Schmidt
- Department of Chemistry and ‡Department of Physics, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
| | - Arun Yethiraj
- Department of Chemistry and ‡Department of Physics, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
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222
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Haskins JB, Wu JJ, Lawson JW. Computational and Experimental Study of Li-Doped Ionic Liquids at Electrified Interfaces. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2016; 120:11993-12011. [PMID: 33005284 PMCID: PMC7526643 DOI: 10.1021/acs.jpcc.6b02449] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
We evaluate the influence of Li-salt doping on the dynamics, capacitance, and structure of three ionic liquid electrolytes, [pyr14][TFSI], [pyr13][FSI], and [EMIM][BF4], using molecular dynamics and polarizable force fields. In this respect, our focus is on the properties of the electric double layer (EDL) formed by the electrolytes at the electrode surface as a function of surface potential (Ψ). The rates of EDL formation are found to be on the order of hundreds of picoseconds and only slightly influenced by the addition of Li-salt. The EDLs of three electrolytes are shown to have different energy storage capacities, which we relate to the EDL formation free energy. The differential capacitance obtained from our computations exhibits asymmetry about the potential of zero charge and is consistent with the camel-like profiles noted from mean field theories and experiments on metallic electrodes. The introduction of Li-salt reduces the noted asymmetry in the differential capacitance profile. Complementary experimental capacitance measurements have been made on our three electrolytes in their neat forms and with Li-salt. The measurements, performed on glassy carbon electrodes, produce U-like profiles, and Li-salt doping is shown to strongly affect capacitance at high magnitudes of Ψ. Differences in the theoretical and experimental shapes and magnitudes of capacitance are rationalized in terms of the electrode surface and pseudocapacitive effects. In both neat and Li-doped liquids, the details of the computational capacitance profile are well described by Ψ-induced changes in the density and molecular orientation of ions in the molecular layer closest to the electrode. Our results suggest that the addition of Li+ induces disorder in the EDL, which originates from the strong binding of anions to Li+. An in-depth analysis of the distribution of Li+ in the EDL reveals that it does not readily enter the molecular layer at the electrode surface, preferring instead to be localized farther away from the surface in the second molecular layer. This behavior is validated through an analysis of the free energy of Li+ solvation as a function of distance from the electrode. Free energy wells are found to coincide with localized concentrations of Li+, the depths of which increase with Ψ and suggest a source of impedance for Li+ to reach the electrode. Finally, we make predictions of the specific energy at ideal graphite utilizing the computed capacitance and previously derived electrochemical windows of the liquids.
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Affiliation(s)
- Justin B. Haskins
- AMA Inc., Thermal Materials Protection Branch, NASA Ames Research Center, Moffett Field, California 94035, USA
| | - James J. Wu
- Photovoltaic and Electrochemical Systems Branch, NASA Glenn Research Center, Cleveland, Ohio 44135, USA
| | - John W. Lawson
- Thermal Materials Protection Branch, NASA Ames Research Center, Moffett Field, California 94035, USA
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223
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Haskins JB, Lawson JW. Evaluation of molecular dynamics simulation methods for ionic liquid electric double layers. J Chem Phys 2016; 144:184707. [DOI: 10.1063/1.4948938] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Affiliation(s)
- Justin B. Haskins
- AMA Inc., Thermal Protection Materials Branch, NASA Ames Research Center, MS N234-1, Moffett Field, California 94035, USA
| | - John W. Lawson
- Thermal Protection Materials Branch, NASA Ames Research Center, MS N234-1, Moffett Field, California 94035, USA
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224
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Tan SYS, Izgorodina EI. Comparison of the Effective Fragment Potential Method with Symmetry-Adapted Perturbation Theory in the Calculation of Intermolecular Energies for Ionic Liquids. J Chem Theory Comput 2016; 12:2553-68. [DOI: 10.1021/acs.jctc.6b00141] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Samuel Y. S. Tan
- School of Chemistry, Monash University, 17 Rainforest
Walk, Clayton, Victoria 3800, Australia
| | - Ekaterina I. Izgorodina
- School of Chemistry, Monash University, 17 Rainforest
Walk, Clayton, Victoria 3800, Australia
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225
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Bedrov D, Hooper JB, Glaser MA, Clark NA. Photoinduced and Thermal Relaxation in Surface-Grafted Azobenzene-Based Monolayers: A Molecular Dynamics Simulation Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:4004-4015. [PMID: 27027147 DOI: 10.1021/acs.langmuir.6b00120] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Extensive atomistic molecular dynamics simulations have been employed to study the structure and molecular orientational relaxation of azobenzene-based monolayers grafted to a solid substrate. Systems with surface coverage of 0.6 nm(2)/molecule were investigated over a wide temperature range ranging from 298 K, where the mesogens show local ordering and the monolayer dynamics was found to be glassy, up to 700 K, where the azobenzene groups have a nearly isotropic orientational distribution, with a subnanosecond characteristic orientational relaxation time scale. Biased simulations that model single-molecule thermal excitation and conformational isomerization have been conducted to obtain insight into the mechanisms for photoinduced athermal fluidization and monolayer reorganization observed experimentally in this system. Our simulations clearly indicate that trans-cis conformational isomerization transitions of azobenzene units can lead to reorientation of mesogens and to the formation of a monolayer with strong macroscopic in-plane nematic order. While local heating created by excitation process can facilitate this process, thermal excitation alone is not sufficient to induce ordering in the monolayer. Instead, the work done by a molecule undergoing cis-trans isomerization on the cage of neighboring molecules is the key mechanism for photofluidization and orientational ordering in dMR monolayers exposed to linearly polarized light leading to relaxation dynamics that can be described in terms of higher effective temperature. The obtained simulation results are discussed in light of recent experimental data reported for these systems.
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Affiliation(s)
- Dmitry Bedrov
- Department of Materials Science & Engineering, University of Utah , Salt Lake City, Utah 84112, United States
| | - Justin B Hooper
- Department of Materials Science & Engineering, University of Utah , Salt Lake City, Utah 84112, United States
| | - Matthew A Glaser
- Department of Physics, University of Colorado at Boulder , Boulder, Colorado 80309, United States
| | - Noel A Clark
- Department of Physics, University of Colorado at Boulder , Boulder, Colorado 80309, United States
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226
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Mogurampelly S, Borodin O, Ganesan V. Computer Simulations of Ion Transport in Polymer Electrolyte Membranes. Annu Rev Chem Biomol Eng 2016; 7:349-71. [PMID: 27070764 DOI: 10.1146/annurev-chembioeng-080615-034655] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Understanding the mechanisms and optimizing ion transport in polymer membranes have been the subject of active research for more than three decades. We present an overview of the progress and challenges involved with the modeling and simulation aspects of the ion transport properties of polymer membranes. We are concerned mainly with atomistic and coarser level simulation studies and discuss some salient work in the context of pure binary and single ion conducting polymer electrolytes, polymer nanocomposites, block copolymers, and ionic liquid-based hybrid electrolytes. We conclude with an outlook highlighting future directions.
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Affiliation(s)
- Santosh Mogurampelly
- Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712;
| | - Oleg Borodin
- Electrochemistry Branch, RDRL-SED-C, US Army Research Laboratory, Adelphi, Maryland 20783-1138;
| | - Venkat Ganesan
- Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712;
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227
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Son CY, McDaniel JG, Schmidt JR, Cui Q, Yethiraj A. First-Principles United Atom Force Field for the Ionic Liquid BMIM+BF4–: An Alternative to Charge Scaling. J Phys Chem B 2016; 120:3560-8. [DOI: 10.1021/acs.jpcb.5b12371] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chang Yun Son
- Department of Chemistry and
Theoretical Chemistry Institute, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Jesse G. McDaniel
- Department of Chemistry and
Theoretical Chemistry Institute, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - J. R. Schmidt
- Department of Chemistry and
Theoretical Chemistry Institute, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Qiang Cui
- Department of Chemistry and
Theoretical Chemistry Institute, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Arun Yethiraj
- Department of Chemistry and
Theoretical Chemistry Institute, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
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228
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Feng G, Zhao W, Cummings PT, Li S. Molecular simulation study of dynamical properties of room temperature ionic liquids with carbon pieces. Sci China Chem 2016. [DOI: 10.1007/s11426-016-5580-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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229
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Saielli G. Fully Atomistic Simulations of the Ionic Liquid Crystal [C16mim][NO3]: Orientational Order Parameters and Voids Distribution. J Phys Chem B 2016; 120:2569-77. [DOI: 10.1021/acs.jpcb.5b12469] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Giacomo Saielli
- CNR Institute
on Membrane
Technology and Department of Chemical Sciences, University of Padova, Via Marzolo, 1, 35131 Padova, Italy
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230
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Bernardes CES, Shimizu K, Lopes JNC, Marquetand P, Heid E, Steinhauser O, Schröder C. Additive polarizabilities in ionic liquids. Phys Chem Chem Phys 2016; 18:1665-70. [PMID: 26675139 DOI: 10.1039/c5cp06595j] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An extended designed regression analysis of experimental data on density and refractive indices of several classes of ionic liquids yielded statistically averaged atomic volumes and polarizabilities of the constituting atoms. These values can be used to predict the molecular volume and polarizability of an unknown ionic liquid as well as its mass density and refractive index. Our approach does not need information on the molecular structure of the ionic liquid, but it turned out that the discrimination of the hybridization state of the carbons improved the overall result. Our results are not only compared to experimental data but also to quantum-chemical calculations. Furthermore, fractional charges of ionic liquid ions and their relation to polarizability are discussed.
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Affiliation(s)
- Carlos E S Bernardes
- Centro de Quimica Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Portugal
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231
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Ishizuka R, Matubayasi N. Self-Consistent Determination of Atomic Charges of Ionic Liquid through a Combination of Molecular Dynamics Simulation and Density Functional Theory. J Chem Theory Comput 2016; 12:804-11. [PMID: 26735302 DOI: 10.1021/acs.jctc.5b00885] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A self-consistent scheme is developed to determine the atomic partial charges of ionic liquid. Molecular dynamics (MD) simulation was conducted to sample a set of ion configurations, and these configurations were subject to density functional theory (DFT) calculations to determine the partial charges. The charges were then averaged and used as inputs for the subsequent MD simulation, and MD and DFT calculations were repeated until the MD results are not altered any more. We applied this scheme to 1,3-dimethylimidazolium bis(trifluoromethylsulfonyl) imide ([C1mim][NTf2]) and investigated its structure and dynamics as a function of temperature. At convergence, the average ionic charges were ±0.84 e at 350 K due to charge transfer among ions, where e is the elementary charge, while the reduced ionic charges do not affect strongly the density of [C1mim][NTf2] and radial distribution function. Instead, major effects are found on the energetics and dynamics, with improvements of the overestimated heat of vaporization and the too slow motions of ions observed in MD simulations using commonly used force fields.
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Affiliation(s)
- Ryosuke Ishizuka
- Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University , Toyonaka, Osaka 560-8531, Japan.,Elements Strategy Initiative for Catalysts and Batteries, Kyoto University , Katsura, Kyoto 615-8520, Japan
| | - Nobuyuki Matubayasi
- Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University , Toyonaka, Osaka 560-8531, Japan.,Elements Strategy Initiative for Catalysts and Batteries, Kyoto University , Katsura, Kyoto 615-8520, Japan
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232
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McDaniel JG, Choi E, Son CY, Schmidt JR, Yethiraj A. Conformational and Dynamic Properties of Poly(ethylene oxide) in an Ionic Liquid: Development and Implementation of a First-Principles Force Field. J Phys Chem B 2016; 120:231-43. [DOI: 10.1021/acs.jpcb.5b10065] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jesse G. McDaniel
- Department
of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Eunsong Choi
- Department
of Physics, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Chang-Yun Son
- Department
of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - J. R. Schmidt
- Department
of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Arun Yethiraj
- Department
of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
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233
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Li B, Ma K, Wang YL, Turesson M, Woodward CE, Forsman J. Fused coarse-grained model of aromatic ionic liquids and their behaviour at electrodes. Phys Chem Chem Phys 2016; 18:8165-73. [DOI: 10.1039/c6cp00202a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A fused coarse-grained model of aromatic ionic liquids 1-alkyl-3-methylimidazoliums tetrafluoroborate ([CnMIM+][BF4−]) has been constructed.
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Affiliation(s)
- Bin Li
- Theoretical Chemistry
- Chemical Centre
- Lund University
- S-221 00 Lund
- Sweden
| | - Ke Ma
- School of Physical
- Environmental and Mathematical Sciences
- University College
- University of New South Wales
- ADFA
| | - Yong-Lei Wang
- System and Component Design
- Department of Machine Design
- KTH Royal Institute of Technology
- SE-100 44 Stockholm
- Sweden
| | - Martin Turesson
- Theoretical Chemistry
- Chemical Centre
- Lund University
- S-221 00 Lund
- Sweden
| | - Clifford E. Woodward
- School of Physical
- Environmental and Mathematical Sciences
- University College
- University of New South Wales
- ADFA
| | - Jan Forsman
- Theoretical Chemistry
- Chemical Centre
- Lund University
- S-221 00 Lund
- Sweden
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234
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Borodin O, Price DL, Aoun B, González MA, Hooper JB, Kofu M, Kohara S, Yamamuro O, Saboungi ML. Effect of water on the structure of a prototype ionic liquid. Phys Chem Chem Phys 2016; 18:23474-81. [DOI: 10.1039/c6cp02191c] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The influence of water on the structure of a prototype ionic liquid (IL) 1-octyl-3-methylimidazolium tetrafluoroborate (C8mimBF4) is examined in the IL-rich regime using high-energy X-ray diffraction (HEXRD) and molecular dynamics (MD) simulations.
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Affiliation(s)
- Oleg Borodin
- Electrochemistry Branch
- Sensor and Electron Devices Directorate
- U.S. Army Research Laboratory
- Adelphi
- USA
| | | | - Bachir Aoun
- Advanced Photon Source
- Argonne National Laboratory
- Argonne
- USA
| | | | - Justin B. Hooper
- Department of Materials Science & Engineering
- University of Utah
- Salt Lake City
- USA
| | - Maiko Kofu
- Institute for Solid State Physics
- University of Tokyo
- Kashiwa
- Japan
| | - Shinji Kohara
- National Institute for Materials Science
- Sayo
- Japan
- JST
- PRESTO
| | - Osamu Yamamuro
- Institute for Solid State Physics
- University of Tokyo
- Kashiwa
- Japan
| | - Marie-Louise Saboungi
- Collegium Sciences et Techniques
- Université d’Orléans and IMPMC-Université Pierre et Marie Curie
- F-75252 Paris
- France
- BCMaterials
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235
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Vergadou N, Androulaki E, Hill JR, Economou IG. Molecular simulations of imidazolium-based tricyanomethanide ionic liquids using an optimized classical force field. Phys Chem Chem Phys 2016; 18:6850-60. [DOI: 10.1039/c5cp05892a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An atomistic force field is optimized to accurately predict the equilibrium and transport properties of technologically important imidazolium-based tricyanomethanide ionic liquids.
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Affiliation(s)
- Niki Vergadou
- National Center for Scientific Research “Demokritos”
- Institute of Nanoscience and Nanotechnology
- Molecular Thermodynamics and Modelling of Materials Laboratory
- Aghia Paraskevi Attikis
- Greece
| | - Eleni Androulaki
- National Center for Scientific Research “Demokritos”
- Institute of Nanoscience and Nanotechnology
- Molecular Thermodynamics and Modelling of Materials Laboratory
- Aghia Paraskevi Attikis
- Greece
| | | | - Ioannis G. Economou
- National Center for Scientific Research “Demokritos”
- Institute of Nanoscience and Nanotechnology
- Molecular Thermodynamics and Modelling of Materials Laboratory
- Aghia Paraskevi Attikis
- Greece
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236
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Lesch V, Li Z, Bedrov D, Borodin O, Heuer A. The influence of cations on lithium ion coordination and transport in ionic liquid electrolytes: a MD simulation study. Phys Chem Chem Phys 2016; 18:382-92. [DOI: 10.1039/c5cp05111h] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The dynamical and structural properties in two ionic liquid electrolytes (ILEs) based on [emim][TFSI] and [pyr13][TFSI] were compared as a function of LiTFSI salt concentrations using atomistic molecular dynamics (MD) simulations.
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Affiliation(s)
- Volker Lesch
- Institut für Energie- und Klimaforschung, Ionics in Energy Storage
- Helmholtz Institut Münster
- Forschungszentrum Jülich
- 48149 Muenster
- Germany
| | - Zhe Li
- Department of Materials Science & Engineering
- University of Utah
- Salt Lake City
- USA
| | - Dmitry Bedrov
- Department of Materials Science & Engineering
- University of Utah
- Salt Lake City
- USA
| | - Oleg Borodin
- U. S. Army Research Laboratory
- Electrochemistry Branch
- Sensors & Electron Devices Directorate
- Adelphi
- USA
| | - Andreas Heuer
- Institute of Physical Chemistry
- Westfälische Wilhelms-Universität Münster
- 48149 Muenster
- Germany
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237
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Zubeir LF, Rocha MAA, Vergadou N, Weggemans WMA, Peristeras LD, Schulz PS, Economou IG, Kroon MC. Thermophysical properties of imidazolium tricyanomethanide ionic liquids: experiments and molecular simulation. Phys Chem Chem Phys 2016; 18:23121-38. [DOI: 10.1039/c6cp01943a] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The low-viscous tricyanomethanide ([TCM]−)-based ionic liquids (ILs) are gaining increasing interest as attractive fluids for a variety of industrial applications.
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Affiliation(s)
- Lawien F. Zubeir
- Department of Chemical Engineering and Chemistry
- Eindhoven University of Technology
- 5612 AE Eindhoven
- The Netherlands
| | - Marisa A. A. Rocha
- Department of Chemical Engineering and Chemistry
- Eindhoven University of Technology
- 5612 AE Eindhoven
- The Netherlands
- University of Bremen
| | - Niki Vergadou
- Molecular Thermodynamics and Modelling of Materials Laboratory
- Institute of Nanoscience and Nanotechnology
- National Center of Scientific Research (NCSR) “Demokritos”
- GR-15310 Aghia Paraskevi Attikis
- Greece
| | - Wilko M. A. Weggemans
- Department of Chemical Engineering and Chemistry
- Eindhoven University of Technology
- 5612 AE Eindhoven
- The Netherlands
| | - Loukas D. Peristeras
- Molecular Thermodynamics and Modelling of Materials Laboratory
- Institute of Nanoscience and Nanotechnology
- National Center of Scientific Research (NCSR) “Demokritos”
- GR-15310 Aghia Paraskevi Attikis
- Greece
| | - Peter S. Schulz
- Department of Chemical and Biological Engineering
- Institute of Chemical Reaction Engineering
- University of Erlangen-Nuremberg
- D-91058 Erlangen
- Germany
| | - Ioannis G. Economou
- Molecular Thermodynamics and Modelling of Materials Laboratory
- Institute of Nanoscience and Nanotechnology
- National Center of Scientific Research (NCSR) “Demokritos”
- GR-15310 Aghia Paraskevi Attikis
- Greece
| | - Maaike C. Kroon
- Department of Chemical Engineering and Chemistry
- Eindhoven University of Technology
- 5612 AE Eindhoven
- The Netherlands
- The Petroleum Institute
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238
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Vatamanu J, Ni X, Liu F, Bedrov D. Tailoring graphene-based electrodes from semiconducting to metallic to increase the energy density in supercapacitors. NANOTECHNOLOGY 2015; 26:464001. [PMID: 26511198 DOI: 10.1088/0957-4484/26/46/464001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The semiconducting character of graphene and some carbon-based electrodes can lead to noticeably lower total capacitances and stored energy densities in electric double layer (EDL)capacitors. This paper discusses the chemical and electronic structure modifications that enhance the available energy bands, density of states and quantum capacitance of graphene substrates near the Fermi level, therefore restoring the conducting character of these materials. The doping of graphene with p or n dopants, such as boron and nitrogen atoms, or the introduction of vacancy defects that introduce zigzag edges, can significantly increase the quantum capacitance within the potential range of interest for the energy storage applications by either shifting the Dirac point away from the Fermi level or by eliminating the Dirac point. We show that a combination of doping and vacancies at realistic concentrations is sufficient to increase the capacitance of a graphene-based electrode to within 1 μF cm(−2) from that of a metallic surface.Using a combination of ab initio calculations and classical molecular dynamics simulations we estimate how the changes in the quantum capacitance of these electrode materials affect the total capacitance stored by the open structure EDL capacitors containing room temperature ionic liquid electrolytes.
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239
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Hofer TS, Tirler AO. Combining 2d-Periodic Quantum Chemistry with Molecular Force Fields: A Novel QM/MM Procedure for the Treatment of Solid-State Surfaces and Interfaces. J Chem Theory Comput 2015; 11:5873-87. [DOI: 10.1021/acs.jctc.5b00548] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thomas S. Hofer
- Theoretical Chemistry Division,
Institute for General Inorganic and Theoretical Chemistry, Center
for Chemistry and Biomedicine, University of Innsbruck, Innrain
80-82, A-6020 Innsbruck, Austria
| | - Andreas O. Tirler
- Theoretical Chemistry Division,
Institute for General Inorganic and Theoretical Chemistry, Center
for Chemistry and Biomedicine, University of Innsbruck, Innrain
80-82, A-6020 Innsbruck, Austria
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240
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Suo L, Borodin O, Gao T, Olguin M, Ho J, Fan X, Luo C, Wang C, Xu K. "Water-in-salt" electrolyte enables high-voltage aqueous lithium-ion chemistries. Science 2015; 350:938-43. [DOI: 10.1126/science.aab1595] [Citation(s) in RCA: 1859] [Impact Index Per Article: 206.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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241
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Zhang Y, Xue L, Khabaz F, Doerfler R, Quitevis EL, Khare R, Maginn EJ. Molecular Topology and Local Dynamics Govern the Viscosity of Imidazolium-Based Ionic Liquids. J Phys Chem B 2015; 119:14934-44. [DOI: 10.1021/acs.jpcb.5b08245] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yong Zhang
- Department
of Chemical and Biomolecular Engineering, University of Notre Dame, Notre
Dame, Indiana 46556, United States
| | - Lianjie Xue
- Department
of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, United States
| | - Fardin Khabaz
- Department
of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409, United States
| | - Rose Doerfler
- Department
of Chemical and Biomolecular Engineering, University of Notre Dame, Notre
Dame, Indiana 46556, United States
| | - Edward L. Quitevis
- Department
of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, United States
| | - Rajesh Khare
- Department
of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409, United States
| | - Edward J. Maginn
- Department
of Chemical and Biomolecular Engineering, University of Notre Dame, Notre
Dame, Indiana 46556, United States
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242
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Haskins JB, Bauschlicher CW, Lawson JW. Ab Initio Simulations and Electronic Structure of Lithium-Doped Ionic Liquids: Structure, Transport, and Electrochemical Stability. J Phys Chem B 2015; 119:14705-19. [PMID: 26505208 DOI: 10.1021/acs.jpcb.5b06951] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Density functional theory (DFT), density functional theory molecular dynamics (DFT-MD), and classical molecular dynamics using polarizable force fields (PFF-MD) are employed to evaluate the influence of Li(+) on the structure, transport, and electrochemical stability of three potential ionic liquid electrolytes: N-methyl-N-butylpyrrolidinium bis(trifluoromethanesulfonyl)imide ([pyr14][TFSI]), N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide ([pyr13][FSI]), and 1-ethyl-3-methylimidazolium boron tetrafluoride ([EMIM][BF4]). We characterize the Li(+) solvation shell through DFT computations of [Li(Anion)n]((n-1)-) clusters, DFT-MD simulations of isolated Li(+) in small ionic liquid systems, and PFF-MD simulations with high Li-doping levels in large ionic liquid systems. At low levels of Li-salt doping, highly stable solvation shells having two to three anions are seen in both [pyr14][TFSI] and [pyr13][FSI], whereas solvation shells with four anions dominate in [EMIM][BF4]. At higher levels of doping, we find the formation of complex Li-network structures that increase the frequency of four anion-coordinated solvation shells. A comparison of computational and experimental Raman spectra for a wide range of [Li(Anion)n]((n-1)-) clusters shows that our proposed structures are consistent with experiment. We then compute the ion diffusion coefficients and find measures from small-cell DFT-MD simulations to be the correct order of magnitude, but influenced by small system size and short simulation length. Correcting for these errors with complementary PFF-MD simulations, we find DFT-MD measures to be in close agreement with experiment. Finally, we compute electrochemical windows from DFT computations on isolated ions, interacting cation/anion pairs, and liquid-phase systems with Li-doping. For the molecular-level computations, we generally find the difference between ionization energy and electron affinity from isolated ions and interacting cation/anion pairs to provide upper and lower bounds, respectively, to experiment. In the liquid phase, we find the difference between the lowest unoccupied and highest occupied electronic levels in pure and hybrid functionals to provide lower and upper bounds, respectively, to experiment. Li-doping in the liquid-phase systems results in electrochemical windows little changed from the neat systems.
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Affiliation(s)
- Justin B Haskins
- AMA Inc., Thermal Protection Materials Branch, Mail Stop 234-1, ‡Entry Systems and Technology Division, Mail Stop 230-3, and §Thermal Protection Materials Branch, Mail Stop 234-1, NASA Ames Research Center , Moffett Field, California 94035, United States
| | - Charles W Bauschlicher
- AMA Inc., Thermal Protection Materials Branch, Mail Stop 234-1, ‡Entry Systems and Technology Division, Mail Stop 230-3, and §Thermal Protection Materials Branch, Mail Stop 234-1, NASA Ames Research Center , Moffett Field, California 94035, United States
| | - John W Lawson
- AMA Inc., Thermal Protection Materials Branch, Mail Stop 234-1, ‡Entry Systems and Technology Division, Mail Stop 230-3, and §Thermal Protection Materials Branch, Mail Stop 234-1, NASA Ames Research Center , Moffett Field, California 94035, United States
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243
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Suarez SN, Rúa A, Cuffari D, Pilar K, Hatcher JL, Ramati S, Wishart JF. Do TFSA Anions Slither? Pressure Exposes the Role of TFSA Conformational Exchange in Self-Diffusion. J Phys Chem B 2015; 119:14756-65. [PMID: 26509865 DOI: 10.1021/acs.jpcb.5b08658] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Multinuclear ((1)H, (2)H, and (19)F) magnetic resonance spectroscopy techniques as functions of temperature and pressure were applied to the study of selectively deuterated 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide (EMIM TFSA) ionic liquid isotopologues and related ionic liquids. For EMIM TFSA, temperature-dependent (2)H T1 data indicate stronger electric field gradients in the alkyl chain region compared to the imidazolium ring. Most significantly, the pressure dependences of the EMIM and TFSA self-diffusion coefficients revealed that the displacements of the cations and anions are independent, with diffusion of the TFSA anions being slowed much more by increasing pressure than for the EMIM cations, as shown by their respective activation volumes (28.8 ± 2.5 cm(3)/mol for TFSA vs 14.6 ± 1.3 cm(3)/mol for EMIM). Increasing pressure may lower the mobility of the TFSA anion by hindering its interconversion between trans and cis conformers, a process that is coupled to diffusion according to published molecular dynamics simulations. Measured activation volumes (ΔV(‡)) for ion self-diffusion in EMIM bis(fluoromethylsulfonyl)amide and EMIM tetrafluoroborate support this hypothesis. In addition, (2)H T1 data suggest increased ordering with increasing pressure, with two T1 regimes observed for the MD3 and D2 isotopologues between 0.1-100 and 100-250 MPa, respectively. The activation volumes for T1 were 21 and 25 cm(3)/mol (0-100 MPa) and 11 and 12 cm(3)/mol (100-250 MPa) for the MD3 and D2 isotopologues, respectively.
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Affiliation(s)
- Sophia N Suarez
- Physics Department, Brooklyn College , Brooklyn, New York 11210, United States
| | - Armando Rúa
- Department of Physics, Hunter College , New York, New York 10021, United States.,CUNY Graduate School, New York, New York 10016, United States
| | - David Cuffari
- Physics Department, Brooklyn College , Brooklyn, New York 11210, United States.,CUNY Graduate School, New York, New York 10016, United States
| | - Kartik Pilar
- Department of Physics, Hunter College , New York, New York 10021, United States.,CUNY Graduate School, New York, New York 10016, United States
| | - Jasmine L Hatcher
- CUNY Graduate School, New York, New York 10016, United States.,Chemistry Department, Brookhaven National Laboratory , Upton, New York 11973, United States
| | - Sharon Ramati
- Chemistry Department, Brookhaven National Laboratory , Upton, New York 11973, United States
| | - James F Wishart
- Chemistry Department, Brookhaven National Laboratory , Upton, New York 11973, United States
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244
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He X, Monk J, Singh R, Hung FR. Molecular modelling of ionic liquids in the ordered mesoporous carbon CMK-5. MOLECULAR SIMULATION 2015. [DOI: 10.1080/08927022.2015.1089992] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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245
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Paschoal VH, Ribeiro MC. Molecular dynamics simulations of high-frequency sound modes in ionic liquids. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.04.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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246
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Eilmes A, Kubisiak P. Explicit Solvent Modeling of Solvatochromic Probes in Ionic Liquids: Implications of Solvation Shell Structure. J Phys Chem B 2015; 119:13185-97. [DOI: 10.1021/acs.jpcb.5b07767] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andrzej Eilmes
- Faculty
of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland
| | - Piotr Kubisiak
- Faculty
of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland
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247
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Abstract
Capacitive energy storage devices are receiving increasing experimental and theoretical attention due to their enormous potential for energy applications. Current research in this field is focused on the improvement of both the energy and the power density of supercapacitors by optimizing the nanostructure of porous electrodes and the chemical structure/composition of the electrolytes. However, the understanding of the underlying correlations and the mechanisms of electric double layer formation near charged surfaces and inside nanoporous electrodes is complicated by the complex interplay of several molecular scale phenomena. This Perspective presents several aspects regarding the experimental and theoretical research in the field, discusses the current atomistic and molecular scale understanding of the mechanisms of energy and charge storage, and provides a brief outlook to the future developments and applications of these devices.
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Affiliation(s)
- Jenel Vatamanu
- Department of Materials Science & Engineering, The University of Utah , 122 S. Central Campus Drive, Salt Lake City, Utah 84112, United States
| | - Dmitry Bedrov
- Department of Materials Science & Engineering, The University of Utah , 122 S. Central Campus Drive, Salt Lake City, Utah 84112, United States
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Arslanargin A, Powers A, Beck TL, Rick SW. Models of Ion Solvation Thermodynamics in Ethylene Carbonate and Propylene Carbonate. J Phys Chem B 2015; 120:1497-508. [DOI: 10.1021/acs.jpcb.5b06891] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ayse Arslanargin
- Department
of Physics, University of Cincinnati, Cincinnati, Ohio 45221, United States
| | - August Powers
- Department
of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States
| | - Thomas L. Beck
- Department
of Physics, University of Cincinnati, Cincinnati, Ohio 45221, United States
- Department
of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States
| | - Steven W. Rick
- Department
of Chemistry, University of New Orleans, New Orleans, Louisiana 70148, United States
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250
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Eilmes A, Kubisiak P. Li+–Oligoglyme Association in the Presence of Ionic Liquid Studied by Molecular Dynamics and Explicit or Implicit Solvent Model. J Phys Chem B 2015; 119:11708-20. [DOI: 10.1021/acs.jpcb.5b05705] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrzej Eilmes
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland
| | - Piotr Kubisiak
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland
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