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Mohandas N, Bawari S, Shibuya JJT, Ghosh S, Mondal J, Narayanan TN, Cuesta A. Understanding electrochemical interfaces through comparing experimental and computational charge density-potential curves. Chem Sci 2024; 15:6643-6660. [PMID: 38725490 PMCID: PMC11077530 DOI: 10.1039/d4sc00746h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Accepted: 04/21/2024] [Indexed: 05/12/2024] Open
Abstract
Electrode-electrolyte interfaces play a decisive role in electrochemical charge accumulation and transfer processes. Theoretical modelling of these interfaces is critical to decipher the microscopic details of such phenomena. Different force field-based molecular dynamics protocols are compared here in a view to connect calculated and experimental charge density-potential relationships. Platinum-aqueous electrolyte interfaces are taken as a model. The potential of using experimental charge density-potential curves to transform cell voltage into electrode potential in force-field molecular dynamics simulations, and the need for that purpose of developing simulation protocols that can accurately calculate the double-layer capacitance, are discussed.
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Affiliation(s)
- Nandita Mohandas
- Tata Institute of Fundamental Research-Hyderabad Hyderabad 500046 India
- Advanced Centre for Energy and Sustainability (ACES), School of Natural and Computing Sciences, University of Aberdeen AB24 3UE Aberdeen Scotland UK
| | - Sumit Bawari
- Tata Institute of Fundamental Research-Hyderabad Hyderabad 500046 India
| | - Jani J T Shibuya
- Advanced Centre for Energy and Sustainability (ACES), School of Natural and Computing Sciences, University of Aberdeen AB24 3UE Aberdeen Scotland UK
| | - Soumya Ghosh
- Tata Institute of Fundamental Research-Hyderabad Hyderabad 500046 India
| | - Jagannath Mondal
- Tata Institute of Fundamental Research-Hyderabad Hyderabad 500046 India
| | | | - Angel Cuesta
- Advanced Centre for Energy and Sustainability (ACES), School of Natural and Computing Sciences, University of Aberdeen AB24 3UE Aberdeen Scotland UK
- Centre for Energy Transition, University of Aberdeen AB24 3FX Aberdeen Scotland UK
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2
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Shakouri S, Khalili B, Nikpasand M, Kefayati H. Adsorption of Tunable aryl alkyl ionic liquids (TILs) on the graphene and Defective graphene nanosheets: A DFT Study. J Mol Graph Model 2023; 125:108612. [PMID: 37657330 DOI: 10.1016/j.jmgm.2023.108612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 08/22/2023] [Accepted: 08/22/2023] [Indexed: 09/03/2023]
Abstract
Optical and electronic characteristics of the graphene nanosheets (GNS) could be altered by some structural defects such as double-vacancy and Stone-Wales ones. The physisorption manner of [MPI][BF4], [MPT1][BF4], [MPT2][BF4], and [MPTT][BF4] ionic liquids on intact and defective GNS surfaces were investigated using M06-2X/cc-pVDZ computational method. Capability for adsorption on the DV and SW graphene surfaces by TILs is increased by about 1.0-4.3 and 0.4-2.0 kcal/mol respectively. The electrostatic potential of the GNS-DV surface is more negative than the GNS-SW one which enables it to interact with cation parts of the adsorbed TILs so extensively. The highest adsorption energy belongs to the [MPI][BF4]/GNS-DV system. Adsorption of the TILs on the GNS surfaces leads to a decrease in the energy of the LUMO molecular orbital as well as their energy gap of them. Results revealed that the electrical conductivity, as well as absorption spectra of the GNS surfaces, are affected by TILs adsorption and defect nature.
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Affiliation(s)
- Soheila Shakouri
- Department of Chemistry, Rasht Branch, Islamic Azad University, Rasht, Iran
| | - Behzad Khalili
- Department of Chemistry, Faculty of Sciences, University of Guilan, Rasht, Iran.
| | - Mohammad Nikpasand
- Department of Chemistry, Rasht Branch, Islamic Azad University, Rasht, Iran
| | - Hasan Kefayati
- Department of Chemistry, Rasht Branch, Islamic Azad University, Rasht, Iran
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3
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de Araujo Chagas H, Fileti EE, Colherinhas G. Comparing supercapacitors with graphene/graphyne electrodes and [Bmim][PF6], [Emim][BF4], [Ch][Gly] and [Pyr][Tfsi] ionic liquids using molecular dynamics. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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4
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Asha AS, Iroegbu JN, Visayas BRB, Mayes M, Shen C. Molecular Insights into the Electric Double-Layer Structure at a Polymer Electrolyte-Electrode Interface. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.142131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
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5
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Gan Z, Wang Y, Lu Y, Qin J, Nie Y, He H. Insight into the camel‐to‐bell transition of differential capacitance in ionic liquids‐based supercapacitor. ChemElectroChem 2022. [DOI: 10.1002/celc.202200274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Zhongdong Gan
- Institute of Process Engineering Chinese Academy of Sciences Ionic liquid department CHINA
| | - Yanlei Wang
- Institute of Process Engineering Chinese Academy of Sciences Ionic LIquid and Clean Process Beiertiao #1,Zhongguancun, Haidian District 100190 Beijing CHINA
| | - Yumiao Lu
- Institute of Process Engineering Chinese Academy of Sciences Ionic liquid department CHINA
| | - Jingyu Qin
- Institute of Process Engineering Chinese Academy of Sciences Ionic liquid department CHINA
| | - Yi Nie
- Institute of Process Engineering Chinese Academy of Sciences Ionic liquid department CHINA
| | - Hongyan He
- Institute of Process Engineering Chinese Academy of Sciences Ionic liquid department CHINA
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6
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Ferreira PH, Sampaio AM, Siqueira LJ. Energy and power performances of binary mixtures of ionic liquids in planar and porous electrodes by molecular dynamics simulations. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.139982] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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7
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Yusuf A, Li Z, Yuan X, Wang DY. Toward a New Generation of Fire-Safe Energy Storage Devices: Recent Progress on Fire-Retardant Materials and Strategies for Energy Storage Devices. SMALL METHODS 2022; 6:e2101428. [PMID: 35119211 DOI: 10.1002/smtd.202101428] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 01/08/2022] [Indexed: 05/11/2023]
Abstract
Over the last few decades, tremendous progress has been achieved in the development of advanced materials for energy storage devices. These achievements have largely enabled the adoption and transition to key technologies such as mobile phones, electric vehicles, and internet of things. However, the recent surge in fire accidents and explosions emanating from energy storage devices have been closely associated with the highly flammable components that make up these devices which have often led to the loss of life and property. Therefore, replacing flammable materials with fire retardant materials has been recognized as the critical solution to the ever-growing fire problem in these devices. This review summarizes the progress achieved so far in the field of fire retardant materials for energy storage devices. Finally, a perspective on the current state of the art is provided, and a future outlook for these fire-retardant materials, strategies, and new characterization methods is discussed.
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Affiliation(s)
- Abdulmalik Yusuf
- IMDEA Materials Institute, Getafe, 28906, Madrid, Spain
- Universidad Politécnica de Madrid, 28040, Madrid, Spain
| | - Zhi Li
- Department of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Xiaoya Yuan
- Department of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
| | - De-Yi Wang
- IMDEA Materials Institute, Getafe, 28906, Madrid, Spain
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8
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Paulista Neto AJ, da Silva DAC, Gonçalves VA, Zanin H, Freitas RG, Fileti EE. An evaluation of the capacitive behavior of supercapacitors as a function of the radius of cations using simulations with a constant potential method. Phys Chem Chem Phys 2022; 24:3280-3288. [PMID: 35048088 DOI: 10.1039/d1cp04350a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report on the atomistic molecular dynamics, applying the constant potential method to determine the structural and electrostatic interactions at the electrode-electrolyte interface of electrochemical supercapacitors as a function of the cation radius (Cs+, Rb+, K+, Na+, Li+). We find that the electrical double layer is susceptible to the size, hydration layer volume, and cations' mobility and analyzed them. Besides, the transient potential shows an increase in magnitude and length as a function of the monocation size, i.e., Cs+ > Rb+ > K+ > Na+ > Li+. On the other hand, the charge distribution along the electrode surface is less uniform for large monocations. Nonetheless, the difference is not observed as a function of the radius of the cation for the integral capacitance. Our results are comparable to studies that employed the fixed charge method for treating such systems.
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Affiliation(s)
- Antenor J Paulista Neto
- Advanced Energy Storage Division, Center for Innovation on New Energies, Carbon Sci-Tech Labs, School of Electrical and Computer Engineering, University of Campinas; Av. Albert Einstein 400, Campinas, SP 13083-852, Brazil.
| | - Débora A C da Silva
- Advanced Energy Storage Division, Center for Innovation on New Energies, Carbon Sci-Tech Labs, School of Electrical and Computer Engineering, University of Campinas; Av. Albert Einstein 400, Campinas, SP 13083-852, Brazil.
| | - Vanessa A Gonçalves
- Institute of Physics & Department of Chemistry, Laboratory of Computational Materials, Federal University of Mato Grosso, 78060-900, Cuiabá, MT, Brazil.
| | - Hudson Zanin
- Advanced Energy Storage Division, Center for Innovation on New Energies, Carbon Sci-Tech Labs, School of Electrical and Computer Engineering, University of Campinas; Av. Albert Einstein 400, Campinas, SP 13083-852, Brazil.
| | - Renato G Freitas
- Institute of Physics & Department of Chemistry, Laboratory of Computational Materials, Federal University of Mato Grosso, 78060-900, Cuiabá, MT, Brazil.
| | - Eudes E Fileti
- Institute of Science and Technology of the Federal University of São Paulo, 12247-014, São José dos Campos, SP, Brazil.
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9
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Moradi K, Rahimi S, Ebrahimi S, Salimi A. Understanding of Bulk and Interfacial Structures Ternary and Binary Deep Eutectic Solvents with a Constant Potential Method: A Molecular Dynamics Study. Phys Chem Chem Phys 2022; 24:10962-10973. [DOI: 10.1039/d2cp01014c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the last decade, deep eutectic solvents (DESs) emerge as promising electrolytes in supercapacitors and rechargeable batteries due to their unique properties, wide electrochemical window, low viscosity, and high ionic...
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10
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Lahrar EH, Simon P, Merlet C. Carbon-carbon supercapacitors: Beyond the average pore size or how electrolyte confinement and inaccessible pores affect the capacitance. J Chem Phys 2021; 155:184703. [PMID: 34773950 DOI: 10.1063/5.0065150] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Carbon-carbon supercapacitors are high power electrochemical energy storage systems, which store energy through reversible ion adsorption at the electrode-electrolyte interface. Due to the complex structure of the porous carbons used as electrodes, extracting structure-property relationships in these systems remains a challenge. In this work, we conduct molecular simulations of two model supercapacitors based on nanoporous electrodes with the same average pore size, a property often used when comparing porous materials, but different morphologies. We show that the carbon with the more ordered structure, and a well defined pore size, has a much higher capacitance than the carbon with the more disordered structure and a broader pore size distribution. We analyze the structure of the confined electrolyte and show that the ions adsorbed in the ordered carbon are present in larger quantities and are also more confined than for the disordered carbon. Both aspects favor a better charge separation and thus a larger capacitance. In addition, the disordered electrodes contain a significant amount of carbon atoms, which are never in contact with the electrolyte, carry a close to zero charge, and are thus not involved in the charge storage. The total quantities of adsorbed ions and degrees of confinement do not change much with the applied potential, and as such, this work opens the door to computationally tractable screening strategies.
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Affiliation(s)
- El Hassane Lahrar
- CIRIMAT, Université de Toulouse, CNRS, Bât. CIRIMAT, 118, route de Narbonne, 31062 Toulouse cedex 9, France
| | - Patrice Simon
- CIRIMAT, Université de Toulouse, CNRS, Bât. CIRIMAT, 118, route de Narbonne, 31062 Toulouse cedex 9, France
| | - Céline Merlet
- CIRIMAT, Université de Toulouse, CNRS, Bât. CIRIMAT, 118, route de Narbonne, 31062 Toulouse cedex 9, France
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11
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Solis FJ, Olvera de la Cruz M. Pimples reduce and dimples enhance flat dielectric surface image repulsion. J Chem Phys 2021; 155:104703. [PMID: 34525828 DOI: 10.1063/5.0058810] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In solid-liquid, or liquid-liquid, interfaces with dielectric contrast, charged particles interact with the induced polarization charge of the interface. These interactions contribute to an effective self-energy of the bulk ions and mediate ion-ion interactions. For flat interfaces, the self-energy and the mediated interactions are neatly constructed by the image charge method. For other geometries, explicit results are scarce and the problem must be treated via approximations or direct computation. The case of interfaces with roughness is of great practical importance. This article provides analytical results, valid to first-order in perturbation theory, for the self-energy of particles near rough substrates. Explicit formulas are provided for the case of a sinusoidal deformation of a flat surface. Generic deformations can be treated by superposition. In addition to results for the self-energy, the surface polarization charge is presented as a quadrature. The interaction between an ion and the deformed surface is modified by the change in relative distance as well as by the local curvature of the surface. Solid walls, with a lower dielectric constant than the liquid, repel all ions. We show that the repulsion is reduced by local convexity and enhanced by concavity; dimples are more repulsive than pimples.
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Affiliation(s)
- Francisco J Solis
- School of Mathematical and Natural Sciences, Arizona State University, Glendale, Arizona 85306, USA
| | - Monica Olvera de la Cruz
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, USA
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12
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Shao C, Ong WL, Shiomi J, McGaughey AJH. Nanoconfinement between Graphene Walls Suppresses the Near-Wall Diffusion of the Ionic Liquid [BMIM][PF 6]. J Phys Chem B 2021; 125:4527-4535. [PMID: 33885322 DOI: 10.1021/acs.jpcb.1c02562] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
We identify two distinct regimes for the diffusion of the ionic liquid [BMIM][PF6] confined between parallel graphene walls using molecular dynamics simulations. Within 2 nm of the wall, the cations and anions form a well-defined layered structure. In this region, the in-plane diffusion coefficients are suppressed when compared to their bulk values and increase monotonically with the distance away from the wall. Beyond 2 nm from the wall, the density profile and in-plane diffusion coefficients recover their bulk values. The channel-averaged in-plane diffusion coefficients increase monotonically with wall separation and recover the bulk values at a separation of 15 nm. A simple semianalytical model is proposed that mirrors this trend. The results also highlight the importance of applying a finite-size correction to molecular dynamics-predicted diffusion coefficients of confined liquids, which may otherwise be unusually larger than their bulk values.
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Affiliation(s)
- Cheng Shao
- Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States.,University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China.,Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
| | - Wee-Liat Ong
- ZJU-UIUC Institute, College of Energy Engineering, Zhejiang University, Haining, Zhejiang 314400, People's Republic of China.,State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, Zhejiang 310027, China
| | - Junichiro Shiomi
- Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
| | - Alan J H McGaughey
- Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
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13
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Eleri OE, Azuatalam KU, Minde MW, Trindade AM, Muthuswamy N, Lou F, Yu Z. Towards high-energy-density supercapacitors via less-defects activated carbon from sawdust. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.137152] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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14
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Shakourian-Fard M, Ghenaatian HR, Kamath G, Taimoory SM. Unraveling the effect of nitrogen doping on graphene nanoflakes and the adsorption properties of ionic liquids: A DFT study. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113400] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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15
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Elliott JD, Troisi A, Carbone P. A QM/MD Coupling Method to Model the Ion-Induced Polarization of Graphene. J Chem Theory Comput 2020; 16:5253-5263. [PMID: 32644791 DOI: 10.1021/acs.jctc.0c00239] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report a new Quantum Mechanical/Molecular Dynamics (QM/MD) simulation loop to model the coupling between the electron and atom dynamics in solid/liquid interfacial systems. The method can describe simultaneously both the quantum mechanical surface polarizability emerging from the proximity to the electrolyte and the electrolyte structure and dynamics. In the current setup, Density Functional Tight Binding calculations for the electronic structure calculations of the surface are coupled with classical molecular dynamics to simulate the electrolyte solution. The reduced computational cost of the QM part makes the coupling with a classical simulation engine computationally feasible and allows simulation of large systems for hundreds of nanoseconds. We tested the method by simulating both a noncharged graphene flake and a noncharged and charged infinite graphene sheet immersed in an NaCl electrolyte solution. We found that, when no bias is applied, ions preferentially remained in solution, and only cations are mildly attracted to the surface of the graphene. This preferential adsorption of cations vs anions seems to persist also when the surface is moderately charged and rules out any substantial ions/surface charge transfer.
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Affiliation(s)
- Joshua D Elliott
- Department of Chemical Engineering and Analytical Science, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Alessandro Troisi
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, United Kingdom
| | - Paola Carbone
- Department of Chemical Engineering and Analytical Science, University of Manchester, Manchester M13 9PL, United Kingdom
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16
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Inoue P, Fileti E, Malaspina T. Computational Study of the Properties of Acetonitrile/Water-in-Salt Hybrid Electrolytes as Electrolytes for Supercapacitors. J Phys Chem B 2020; 124:5685-5695. [PMID: 32551632 DOI: 10.1021/acs.jpcb.0c03516] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Normal and water-in-salt Li-bis(trifluoromethane) sulfonimide anion-based electrolytes were modeled using atomistic molecular dynamics simulations. Their acetonitrile (ACN) mixtures, in various concentrations, were also studied to evaluate the impact of a cosolvent on the structural, dynamical, and electrical properties of the electrolytes using liquid electrolyte and supercapacitor models. Our simulations for pure and ACN-based electrolytes revealed a drastic difference that exists between normal electrolytes and water-in-salt electrolytes and a systematic reduction of the diffusion of species by approximately a factor of 2 because of the ACN impact. Electrolytic cells for each electrolyte were built with graphene as the electrode. Our results for capacitance reveal an asymmetry between the electrode capacitances, with negative electrode capacitance systematically higher than those of the positive electrode. The total capacitance of the electrode exhibited negligible variations regardless of the concentration and composition of the electrolyte.
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Affiliation(s)
- Pedro Inoue
- Instituto de Ciência e Tecnologia, Universidade Federal de São Paulo, São José dos Campos, 12247-014 São Paulo, Brazil
| | - Eudes Fileti
- Instituto de Ciência e Tecnologia, Universidade Federal de São Paulo, São José dos Campos, 12247-014 São Paulo, Brazil
| | - Thaciana Malaspina
- Instituto de Ciência e Tecnologia, Universidade Federal de São Paulo, São José dos Campos, 12247-014 São Paulo, Brazil
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17
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Sampaio AM, Siqueira LJA. Ether-Functionalized Sulfonium Ionic Liquid and Its Binary Mixtures with Acetonitrile as Electrolyte for Electrochemical Double Layer Capacitors: A Molecular Dynamics Study. J Phys Chem B 2020; 124:6679-6689. [DOI: 10.1021/acs.jpcb.0c02643] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Abner Massari Sampaio
- Laboratório de Materiais Híbridos, Departamento de Química, Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Rua São Nicolau, 210, Diadema, SP-CEP 09913-030, Brazil
| | - Leonardo José Amaral Siqueira
- Laboratório de Materiais Híbridos, Departamento de Química, Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Rua São Nicolau, 210, Diadema, SP-CEP 09913-030, Brazil
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18
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Sampaio AM, Fileti EE, Siqueira LJ. Atomistic study of the physical properties of sulfonium-based ionic liquids as electrolyte for supercapacitors. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.112065] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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19
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Neto A, Fileti E. An atomistic physico-chemical description of acetonitrile/tricyanomethanide based electrolytes. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111439] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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20
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Noh C, Jung Y. Understanding the charging dynamics of an ionic liquid electric double layer capacitor via molecular dynamics simulations. Phys Chem Chem Phys 2019; 21:6790-6800. [PMID: 30735216 DOI: 10.1039/c8cp07200k] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
We investigate the charging phenomena of an electric double layer capacitor (EDLC) by conducting both equilibrium and non-equilibrium molecular dynamics (MD) simulations. A graphene electrode and 1-ethyl-3-methylimidazolium thiocyanate ([EMIM]+[SCN]-) ionic liquid were used as a system for the EDLC. We clarify the ionic layer structure and show that an abrupt change of the ionic layers leads to a high differential capacitance of the EDLC. The charging simulations reveal that the charging dynamics of the EDLC is highly dependent on the rearrangement of the ionic layer structure. Particularly, the electrode charge during the charging process is consistent with the perpendicular displacement of ionic liquid molecules. From this property, we analyze the contribution of each molecular ion to the electrode charge stored during charging. Charging of the EDLC is largely dependent on the desorption of the co-ions from the electrode rather than the adsorption of the counter-ions. In addition, the contribution of bulk ions to the charge stored in the EDLC is as important as that of ions adjacent to the electrode surface contrary to the conventional viewpoint. From these results, we identify the charging mechanism of the EDLC and discuss the relevance to experimental results. Our findings in the present study are expected to play an important role in designing an efficient EDLC with a novel perspective on the charging of the EDLC.
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Affiliation(s)
- Chanwoo Noh
- Department of Chemistry, Seoul National University, Seoul 08826, Korea.
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21
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Fileti EE, Colherinhas G. Investigating the asymmetry in the EDL response of C60/graphene supercapacitors. Phys Chem Chem Phys 2019; 21:15362-15371. [DOI: 10.1039/c9cp02664a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular dynamics simulations were employed to model C60/graphene composite electrodes that can expand the effective area and performance of supercapacitors.
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Affiliation(s)
- Eudes Eterno Fileti
- Instituto de Ciência e Tecnologia
- Universidade Federal de São Paulo
- São José dos Campos
- Brazil
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22
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Colherinhas G, Malaspina T, Fileti EE. Storing Energy in Biodegradable Electrochemical Supercapacitors. ACS OMEGA 2018; 3:13869-13875. [PMID: 30411051 PMCID: PMC6217657 DOI: 10.1021/acsomega.8b01980] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 10/15/2018] [Indexed: 05/04/2023]
Abstract
The development of green and biodegradable electrical components is one of the main fronts of research to overcome the growing ecological problem related to the issue of electronic waste. At the same time, such devices are highly desirable in biomedical applications such as integrated bioelectronics, for which biocompatibility is also required. Supercapacitors for storage of electrochemical energy, designed only with biodegradable organic matter would contemplate both aspects, that is, they would be ecologically harmless after their service lifetime and would be an important component for applications in biomedical engineering. By means of atomistic simulations of molecular dynamics, we propose a supercapacitor whose electrodes are formed exclusively by self-organizing peptides and whose electrolyte is a green amino acid ionic liquid. Our results indicate that this supercapacitor has a high potential for energy storage with superior performance than conventional supercapacitors. In particular its capacity to store energy was estimated to be almost 20 times greater than an analogue one of planar metallic electrodes.
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Affiliation(s)
- Guilherme Colherinhas
- Departamento
de Física, CEPAE, Universidade Federal
de Goiás, 74690-900 Goiânia, Goiás, Brazil
| | - Thaciana Malaspina
- Instituto
de Ciência e Tecnologia, Universidade
Federal de São Paulo, 12247-014 São José
dos Campos, São Paulo, Brazil
| | - Eudes Eterno Fileti
- Instituto
de Ciência e Tecnologia, Universidade
Federal de São Paulo, 12247-014 São José
dos Campos, São Paulo, Brazil
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23
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Jo S, Park SW, Noh C, Jung Y. Computer simulation study of differential capacitance and charging mechanism in graphene supercapacitors: Effects of cyano-group in ionic liquids. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.07.126] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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24
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Influence of geometry-induced frequency dispersion on the impedance of rectangular electrodes. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.07.080] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Li C, Wang P, Li S, Zhao D, Zhao Q, Liu H, Cui X. Active Mechanism of the Interphase Film-Forming Process for an Electrolyte Based on a Sulfolane Solvent and a Chelato-Borate Complex. ACS APPLIED MATERIALS & INTERFACES 2018; 10:25744-25753. [PMID: 29900736 DOI: 10.1021/acsami.8b05125] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Electrolytes based on sulfolane (SL) solvents and lithium bis(oxalato)borate (LiBOB) chelato-borate complexes have been reported many times for use in advanced lithium-ion batteries due to their many advantages. This study aims to clarify the active mechanism of the interphase film-forming process to optimize the properties of these batteries by experimental analysis and theoretical calculations. The results indicate that the self-repairing film-forming process during the first cycle is divided into three stages: the initial film formation with an electric field force of ∼1.80 V, the further growth of the preformation solid electrolyte interphase (SEI) film at ∼1.73 V, and the final formation of a complete SEI film at a potential below 0.7 V. Additionally, we can deduce that the decomposition of LiBOB and SL occurs throughout nearly the entire process of the formation of the SEI film. The decomposition product of BOB- anions tends to form films with an irregular structure, whereas the decomposition product of SL is in favor of the formation of a uniform SEI film.
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Affiliation(s)
- Chunlei Li
- College of Petrochemical Technology , Lanzhou University of Technology , Lanzhou 730050 , China
- Gansu Engineering Laboratory of Electrolyte Material for Lithium-ion Battery , Lanzhou 730050 , China
| | - Peng Wang
- College of Petrochemical Technology , Lanzhou University of Technology , Lanzhou 730050 , China
| | - Shiyou Li
- College of Petrochemical Technology , Lanzhou University of Technology , Lanzhou 730050 , China
- Gansu Engineering Laboratory of Electrolyte Material for Lithium-ion Battery , Lanzhou 730050 , China
| | - Dongni Zhao
- College of Petrochemical Technology , Lanzhou University of Technology , Lanzhou 730050 , China
| | - Qiuping Zhao
- College of Petrochemical Technology , Lanzhou University of Technology , Lanzhou 730050 , China
- Gansu Engineering Laboratory of Electrolyte Material for Lithium-ion Battery , Lanzhou 730050 , China
| | - Haining Liu
- Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes , Chinese Academy of Sciences , Xining 810008 , China
| | - Xiaoling Cui
- College of Petrochemical Technology , Lanzhou University of Technology , Lanzhou 730050 , China
- Gansu Engineering Laboratory of Electrolyte Material for Lithium-ion Battery , Lanzhou 730050 , China
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26
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Chaban VV, Andreeva NA, Fileti EE. Graphene/ionic liquid ultracapacitors: does ionic size correlate with energy storage performance? NEW J CHEM 2018. [DOI: 10.1039/c8nj04399j] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Electrolytes formed by ions of similar volumes show better performance in supercapacitor applications.
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Affiliation(s)
| | - Nadezhda A. Andreeva
- Department of Physics
- St. Petersburg State University
- St. Petersburg
- Russian Federation
| | - Eudes Eterno Fileti
- Instituto de Ciência e Tecnologia
- Universidade Federal de São Paulo
- São José dos Campos
- Brazil
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27
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Effects of Alkyl Chain Length on Interfacial Structure and Differential Capacitance in Graphene Supercapacitors: A Molecular Dynamics Simulation Study. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.06.169] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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28
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Yang H, Yang J, Bo Z, Chen X, Shuai X, Kong J, Yan J, Cen K. Kinetic-Dominated Charging Mechanism within Representative Aqueous Electrolyte-based Electric Double-Layer Capacitors. J Phys Chem Lett 2017; 8:3703-3710. [PMID: 28742361 DOI: 10.1021/acs.jpclett.7b01525] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The chemical nature of electrolytes has been demonstrated to play a pivotal role in the charge storage of electric double-layer capacitors (EDLCs), whereas primary mechanisms are still partially resolved but controversial. In this work, a systematic exploration into EDL structures and kinetics of representative aqueous electrolytes is performed with numerical simulation and experimental research. Unusually, a novel charging mechanism exclusively predominated by kinetics is recognized, going beyond traditional views of manipulating capacitances preferentially via interfacial structural variations. Specifically, strikingly distinctive EDL structures stimulated by diverse ion sizes, valences, and mixtures manifest a virtually identical EDL capacitance, where the dielectric nature of solvents attenuates ionic effects on electrolyte redistributions, in stark contradiction with solvent-free counterpart and traditional Helmholtz theory. Meanwhile, corresponding kinetics evolve conspicuously with ionic species, intimately correlated with ion-solvent interactions. The achieved mechanisms are subsequently illuminated by electrochemical measurements, highlighting the crucial interplay between ions and solvents in regulating EDLC performances.
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Affiliation(s)
- Huachao Yang
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University , Hangzhou, Zhejiang Province 310027, China
| | - Jinyuan Yang
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University , Hangzhou, Zhejiang Province 310027, China
| | - Zheng Bo
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University , Hangzhou, Zhejiang Province 310027, China
| | - Xia Chen
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University , Hangzhou, Zhejiang Province 310027, China
| | - Xiaorui Shuai
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University , Hangzhou, Zhejiang Province 310027, China
| | - Jing Kong
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University , Hangzhou, Zhejiang Province 310027, China
| | - Jianhua Yan
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University , Hangzhou, Zhejiang Province 310027, China
| | - Kefa Cen
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University , Hangzhou, Zhejiang Province 310027, China
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29
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Shakourian-Fard M, Kamath G. The effect of defect types on the electronic and optical properties of graphene nanoflakes physisorbed by ionic liquids. Phys Chem Chem Phys 2017; 19:4383-4395. [PMID: 28119976 DOI: 10.1039/c6cp07455c] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Defect engineering and non-covalent interaction strategies allow for dramatically tuning the optoelectronic properties of graphene. Using ab initio density functional theory (M06-2X/cc-pVDZ), we find that the nature of defects on the graphene nanoflakes (GNFs) and the size of defective GNF (DGNF) surfaces affect the binding energy (ΔEb) of ionic liquids (ILs) and the UV-Vis absorption spectra of DGNFIL complexes. Further, our results indicate that increasing the size of DGNFs affects the geometrical structure of the surfaces and increases the binding energy of ILs by about 10%. Analysis based on AIM and EDA shows that the interactions between ILs and DGNFs are non-covalent in nature (dispersion energy being dominant) and associated with charge transfer between the IL and nanoflakes. A comparison between the ΔEb values of ILs on DGNFs, GNFs, and h-BN nanoflakes (h-BNNF) shows that the presence of defects on the GNF surfaces increases the binding energy values as follows: DGNFIL > pristine GNFIL > h-BNNFIL. Our calculations indicate that increasing the size of DGNF surfaces leads to a decrease in the HOMO-LUMO energy gap (Eg) of the DGNF surfaces. Orbital energy and density of state calculations show that the Eg of DV(SW)-GNFs decreases upon IL adsorption and their Fermi energy level is shifted depending on the type of IL, thus enabling better conductivity. Reactivity descriptors generally indicate that the chemical potential (μ) and chemical hardness (η) of nanoflakes decrease upon IL adsorption, whereas the electrophilicity index (ω) increases. The UV-Vis absorption spectrum of DV-GNF and SW-GNF shows four bands in the visible spectrum which correspond to π → π* transitions with the absorption bands of SW-GNF appearing at higher wavelengths than those of DV-GNF. The most intense absorption bands in DV-GNF (λ = 348 nm) and SW-GNF (λ = 375 nm) are associated with electronic transitions HOMO-1 → LUMO+2 and HOMO → LUMO+1, respectively. In addition, these absorption bands undergo a red-shift by both increasing the size of the DV(SW)-GNF surfaces and IL adsorption. We also observe that the energy gaps and absorption spectra can be altered by varying the defect types and the type of IL adsorbate, where the defect types affect the spectral shapes of the bands and adsorbates at the first absorption peak, thus having potential application for light-emitting devices.
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Affiliation(s)
- Mehdi Shakourian-Fard
- Birjand University of Technology, Department of Chemical Engineering, Birjand, P.O. Box 97175/569, Iran.
| | - Ganesh Kamath
- Department of Chemistry, University of Missouri-Columbia, Columbia, MO 65211, USA
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30
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Foroutan M, Fatemi SM, Esmaeilian F. A review of the structure and dynamics of nanoconfined water and ionic liquids via molecular dynamics simulation. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2017; 40:19. [PMID: 28229319 DOI: 10.1140/epje/i2017-11507-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 01/30/2017] [Indexed: 05/04/2023]
Abstract
During the past decade, the research on fluids in nanoconfined geometries has received considerable attention as a consequence of their wide applications in different fields. Several nanoconfined systems such as water and ionic liquids, together with an equally impressive array of nanoconfining media such as carbon nanotube, graphene and graphene oxide have received increasingly growing interest in the past years. Water is the first system that has been reviewed in this article, due to its important role in transport phenomena in environmental sciences. Water is often considered as a highly nanoconfined system, due to its reduction to a few layers of water molecules between the extended surface of large macromolecules. The second system discussed here is ionic liquids, which have been widely studied in the modern green chemistry movement. Considering the great importance of ionic liquids in industry, and also their oil/water counterpart, nanoconfined ionic liquid system has become an important area of research with many fascinating applications. Furthermore, the method of molecular dynamics simulation is one of the major tools in the theoretical study of water and ionic liquids in nanoconfinement, which increasingly has been joined with experimental procedures. In this way, the choice of water and ionic liquids in nanoconfinement is justified by applying molecular dynamics simulation approaches in this review article.
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Affiliation(s)
- Masumeh Foroutan
- Department of Physical Chemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran.
| | - S Mahmood Fatemi
- Department of Physical Chemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran
| | - Farshad Esmaeilian
- Department of Physical Chemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran
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31
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Yang PY, Ju SP, Hsieh HS, Lin JS. The diffusion behavior and capacitance of tetraethylammonium/tetrafluoroborate ions in acetonitrile with different molar concentrations: a molecular dynamics study. RSC Adv 2017. [DOI: 10.1039/c7ra09465e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A molecular dynamics (MD) simulation with the optimized potentials for liquid simulations-all atom (OPLS-AA) force field was carried out to investigate the dynamic behaviors of organic electrolyte molecules between a graphite cathode and anode.
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Affiliation(s)
- Po-Yu Yang
- Department of Mechanical and Electro-Mechanical Engineering
- National Sun Yat-sen University
- Kaohsiung 804
- Taiwan
| | - Shin-Pon Ju
- Department of Mechanical and Electro-Mechanical Engineering
- National Sun Yat-sen University
- Kaohsiung 804
- Taiwan
- Department of Medicinal and Applied Chemistry
| | - Hua-Sheng Hsieh
- Department of Mechanical and Electro-Mechanical Engineering
- National Sun Yat-sen University
- Kaohsiung 804
- Taiwan
| | - Jenn-Sen Lin
- Department of Mechanical Engineering
- National United University
- Miaoli 360
- Taiwan
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32
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Wang Z, Olmsted DL, Asta M, Laird BB. Electric potential calculation in molecular simulation of electric double layer capacitors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:464006. [PMID: 27624573 DOI: 10.1088/0953-8984/28/46/464006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
For the molecular simulation of electric double layer capacitors (EDLCs), a number of methods have been proposed and implemented to determine the one-dimensional electric potential profile between the two electrodes at a fixed potential difference. In this work, we compare several of these methods for a model LiClO4-acetonitrile/graphite EDLC simulated using both the traditional fixed-charged method (FCM), in which a fixed charge is assigned a priori to the electrode atoms, or the recently developed constant potential method (CPM) (2007 J. Chem. Phys. 126 084704), where the electrode charges are allowed to fluctuate to keep the potential fixed. Based on an analysis of the full three-dimensional electric potential field, we suggest a method for determining the averaged one-dimensional electric potential profile that can be applied to both the FCM and CPM simulations. Compared to traditional methods based on numerically solving the one-dimensional Poisson's equation, this method yields better accuracy and no supplemental assumptions.
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Affiliation(s)
- Zhenxing Wang
- Department of Chemistry, University of Kansas, Lawrence, KS 66045, USA
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33
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Park SW, DeYoung AD, Dhumal NR, Shim Y, Kim HJ, Jung Y. Computer Simulation Study of Graphene Oxide Supercapacitors: Charge Screening Mechanism. J Phys Chem Lett 2016; 7:1180-6. [PMID: 26966918 DOI: 10.1021/acs.jpclett.6b00202] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Graphene oxide supercapacitors in the parallel plate configuration are studied via molecular dynamics (MD) simulations. The full range of electrode oxidation from 0 to 100% is examined by oxidizing the graphene surface with hydroxyl groups. Two different electrolytes, 1-ethyl-3-methylimidazolium tetrafluoroborate (EMI(+)BF4(-)) as an ionic liquid and its 1.3 M solution in acetonitrile as an organic electrolyte, are considered. While the area-specific capacitance tends to decrease with increasing electrode oxidation for both electrolytes, its details show interesting differences between the organic electrolyte and ionic liquid, including the extent of decrease. For detailed insight into these differences, the screening mechanisms of electrode charges by electrolytes and their variations with electrode oxidation are analyzed with special attention paid to the aspects shared by and the contrasts between the organic electrolyte and ionic liquid.
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Affiliation(s)
- Sang-Won Park
- Department of Chemistry, Seoul National University , Seoul 08826, Korea
| | - Andrew D DeYoung
- Department of Chemistry, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Nilesh R Dhumal
- Department of Chemistry, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Youngseon Shim
- Department of Chemistry, Seoul National University , Seoul 08826, Korea
| | - Hyung J Kim
- Department of Chemistry, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
- School of Computational Sciences, Korea Institute for Advanced Study , Seoul 02455, Korea
| | - YounJoon Jung
- Department of Chemistry, Seoul National University , Seoul 08826, Korea
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34
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Kim S, Park SW, Jung Y. Heterogeneous dynamics and its length scale in simple ionic liquid models: a computational study. Phys Chem Chem Phys 2016; 18:6486-97. [DOI: 10.1039/c5cp07368e] [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
We numerically investigate the dynamic heterogeneity and its length scale found in coarse-grained ionic liquid model systems.
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Affiliation(s)
- Soree Kim
- Department of Chemistry
- Seoul National University
- Seoul 08826
- Korea
| | - Sang-Won Park
- Department of Chemistry
- Seoul National University
- Seoul 08826
- Korea
| | - YounJoon Jung
- Department of Chemistry
- Seoul National University
- Seoul 08826
- Korea
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35
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dos Santos AP, Levin Y. Electrolytes between dielectric charged surfaces: Simulations and theory. J Chem Phys 2015; 142:194104. [PMID: 26001444 DOI: 10.1063/1.4921221] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
We present a simulation method to study electrolyte solutions in a dielectric slab geometry using a modified 3D Ewald summation. The method is fast and easy to implement, allowing us to rapidly resum an infinite series of image charges. In the weak coupling limit, we also develop a mean-field theory which allows us to predict the ionic distribution between the dielectric charged plates. The agreement between both approaches, theoretical and simulational, is very good, validating both methods. Examples of ionic density profiles in the strong electrostatic coupling limit are also presented. Finally, we explore the confinement of charge asymmetric electrolytes between neutral surfaces.
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Affiliation(s)
- Alexandre P dos Santos
- Instituto de Física, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, CEP 91501-970, Porto Alegre, RS, Brazil
| | - Yan Levin
- Instituto de Física, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, CEP 91501-970, Porto Alegre, RS, Brazil
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36
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Alibalazadeh M, Foroutan M. Specific distributions of anions and cations of an ionic liquid through confinement between graphene sheets. J Mol Model 2015; 21:168. [DOI: 10.1007/s00894-015-2703-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2015] [Accepted: 05/17/2015] [Indexed: 11/29/2022]
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37
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Hughes ZE, Walsh TR. Computational chemistry for graphene-based energy applications: progress and challenges. NANOSCALE 2015; 7:6883-6908. [PMID: 25833794 DOI: 10.1039/c5nr00690b] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Research in graphene-based energy materials is a rapidly growing area. Many graphene-based energy applications involve interfacial processes. To enable advances in the design of these energy materials, such that their operation, economy, efficiency and durability is at least comparable with fossil-fuel based alternatives, connections between the molecular-scale structure and function of these interfaces are needed. While it is experimentally challenging to resolve this interfacial structure, molecular simulation and computational chemistry can help bridge these gaps. In this Review, we summarise recent progress in the application of computational chemistry to graphene-based materials for fuel cells, batteries, photovoltaics and supercapacitors. We also outline both the bright prospects and emerging challenges these techniques face for application to graphene-based energy materials in future.
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Affiliation(s)
- Zak E Hughes
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia.
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38
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Suleman M, Kumar Y, Hashmi SA. Flexible electric double-layer capacitors fabricated with micro-/mesoporous carbon electrodes and plastic crystal incorporated gel polymer electrolytes containing room temperature ionic liquids. J Solid State Electrochem 2015. [DOI: 10.1007/s10008-014-2731-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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39
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Paek E, Pak AJ, Hwang GS. On the influence of polarization effects in predicting the interfacial structure and capacitance of graphene-like electrodes in ionic liquids. J Chem Phys 2015; 142:024701. [DOI: 10.1063/1.4905328] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Eunsu Paek
- McKetta Department of Chemical Engineering, University of Texas, Austin, Texas 78712, USA
| | - Alexander J. Pak
- McKetta Department of Chemical Engineering, University of Texas, Austin, Texas 78712, USA
| | - Gyeong S. Hwang
- McKetta Department of Chemical Engineering, University of Texas, Austin, Texas 78712, USA
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40
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Wang Z, Yang Y, Olmsted DL, Asta M, Laird BB. Evaluation of the constant potential method in simulating electric double-layer capacitors. J Chem Phys 2014; 141:184102. [DOI: 10.1063/1.4899176] [Citation(s) in RCA: 120] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Affiliation(s)
- Zhenxing Wang
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045, USA
| | - Yang Yang
- Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA
| | - David L. Olmsted
- Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA
| | - Mark Asta
- Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA
| | - Brian B. Laird
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045, USA
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41
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Kerisit S, Schwenzer B, Vijayakumar M. Effects of Oxygen-Containing Functional Groups on Supercapacitor Performance. J Phys Chem Lett 2014; 5:2330-2334. [PMID: 26279555 DOI: 10.1021/jz500900t] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Molecular dynamics (MD) simulations of the interface between graphene and the ionic liquid 1-butyl-3-methylimidazolium trifluoromethanesulfonate (BMIM OTf) were carried out to gain molecular-level insights into the performance of graphene-based supercapacitors and, in particular, determine the effects of the presence of oxygen-containing defects at the graphene surface on their integral capacitance. The MD simulations predict that increasing the surface coverage of hydroxyl groups negatively affects the integral capacitance, whereas the effect of the presence of epoxy groups is much less significant. The calculated variations in capacitance are found to be directly correlated to the interfacial structure. Indeed, hydrogen bonding between hydroxyl groups and SO3 moieties prevents BMIM(+) and OTf(-) ions from interacting favorably in the interfacial layer and restrains the orientation and mobility of OTf(-) ions, thereby reducing the interfacial permittivity of the ionic liquid. The results of the simulations can facilitate the rational design of electrode materials for supercapacitors.
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Affiliation(s)
- Sebastien Kerisit
- Physical Sciences Division, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352 United States
| | - Birgit Schwenzer
- Physical Sciences Division, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352 United States
| | - M Vijayakumar
- Physical Sciences Division, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352 United States
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42
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Effect of graphitic structure on electrochemical ion intercalation into positive and negative electrodes. J Solid State Electrochem 2014. [DOI: 10.1007/s10008-014-2527-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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43
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Jiang DE, Wu J. Unusual effects of solvent polarity on capacitance for organic electrolytes in a nanoporous electrode. NANOSCALE 2014; 6:5545-5550. [PMID: 24733527 DOI: 10.1039/c4nr00046c] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The interplay between ions and solvent molecules inside the nanoporous electrodes of a supercapacitor has not been well understood but could be a fertile ground for new insights into the device's performance. By tuning the dipole moment of the solvent in an organic electrolyte, we find, from classical density functional theory calculations, pronounced oscillation of capacitance with the pore size for a moderately to weakly polar solvent. A quantitative analysis of the electric-double-layer (EDL) structure indicates that the capacitance oscillation shares a similar physical origin to that of an ionic liquid electrolyte: the oscillatory behavior arises from the formation of alternating layers of counterions and coions near strongly charged surfaces. More interestingly, we find that in the large-pore region, the capacitance versus the pore size has a volcano-shaped trend; in other words, there exists a solvent dipole moment that yields a maximal capacitance. These theoretical predictions can be validated with future experiments and highlight the great potential in tuning the organic solvent to achieve optimal performance of EDL capacitors.
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Affiliation(s)
- De-en Jiang
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
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44
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Punnathanam SN. A Gibbs-ensemble based technique for Monte Carlo simulation of electric double layer capacitors (EDLC) at constant voltage. J Chem Phys 2014; 140:174110. [DOI: 10.1063/1.4873707] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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45
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Béguin F, Presser V, Balducci A, Frackowiak E. Carbons and electrolytes for advanced supercapacitors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:2219-51, 2283. [PMID: 24497347 DOI: 10.1002/adma.201304137] [Citation(s) in RCA: 836] [Impact Index Per Article: 83.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Revised: 10/22/2013] [Indexed: 05/19/2023]
Abstract
Electrical energy storage (EES) is one of the most critical areas of technological research around the world. Storing and efficiently using electricity generated by intermittent sources and the transition of our transportation fleet to electric drive depend fundamentally on the development of EES systems with high energy and power densities. Supercapacitors are promising devices for highly efficient energy storage and power management, yet they still suffer from moderate energy densities compared to batteries. To establish a detailed understanding of the science and technology of carbon/carbon supercapacitors, this review discusses the basic principles of the electrical double-layer (EDL), especially regarding the correlation between ion size/ion solvation and the pore size of porous carbon electrodes. We summarize the key aspects of various carbon materials synthesized for use in supercapacitors. With the objective of improving the energy density, the last two sections are dedicated to strategies to increase the capacitance by either introducing pseudocapacitive materials or by using novel electrolytes that allow to increasing the cell voltage. In particular, advances in ionic liquids, but also in the field of organic electrolytes, are discussed and electrode mass balancing is expanded because of its importance to create higher performance asymmetric electrochemical capacitors.
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Affiliation(s)
- François Béguin
- Institute of Chemistry and Technical Electrochemistry, Poznan University of Technology, Piotrowo 3, 60-965, Poznan, Poland
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46
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Burt R, Birkett G, Zhao XS. A review of molecular modelling of electric double layer capacitors. Phys Chem Chem Phys 2014; 16:6519-38. [DOI: 10.1039/c3cp55186e] [Citation(s) in RCA: 180] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Merlet C, Salanne M, Rotenberg B, Madden PA. Influence of solvation on the structural and capacitive properties of electrical double layer capacitors. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2012.12.107] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Shi R, Wang Y. Ion-Cage Interpretation for the Structural and Dynamic Changes of Ionic Liquids under an External Electric Field. J Phys Chem B 2013; 117:5102-12. [DOI: 10.1021/jp311017r] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Rui Shi
- 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
| | - 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
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Phillips KA, Palmer JC, Gubbins KE. Analysis of the solvation structure of rubidium bromide under nanoconfinement. MOLECULAR SIMULATION 2012. [DOI: 10.1080/08927022.2012.713484] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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