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Tu YJ, Peng ST. Influence of surface nanostructure-induced innermost ion structuring on capacitance of carbon/ionic liquid double layers. Phys Chem Chem Phys 2024; 26:5932-5946. [PMID: 38299635 DOI: 10.1039/d3cp05617a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2024]
Abstract
Ionic liquids have drawn great interest as electrolytes for energy storage applications in which they form characteristic electrical double layers at electrode interfaces. For ionic liquids at carbon electrode interfaces, their double layers are subject to nanoscale structuring of the electrode surface, involving altered ion structure and interactions that significantly influence the double layer capacitance. In this regard, we investigate the modulation of ionic liquid double layers by electrode surface roughness and the resulting effects on the ion structure, interaction, and capacitance. We performed fixed voltage molecular dynamics simulations to compute the differential capacitance profiles for the ionic liquids [BMIm+][TFSI-] and [BMIm+][FSI-] at model carbon electrode interfaces with the surface channel width at subnanometer and nanometer scales. We find that both [BMIm+][TFSI-] and [BMIm+][FSI-] exhibit enhanced differential capacitance for the electrode surface with a subnanometer channel width relative to the flat graphene surface, but the most pronounced enhancements for these two ionic liquids unexpectedly appear at different applied potential regimes. For [BMIm+][TFSI-], the nanostructured electrode shows significant enhancement of capacitance at high positive potential. For [BMIm+][FSI-], on the other hand, this enhancement is small at positive polarization but noticeable at low negative potential. We demonstrate that differences in these capacitance trends is due to differences in ion correlation that arise from a steric constraint of nanostructured electrode surface on the voltage-mediated restructuring of ions closest to the electrode interface. For example, the TFSI- and FSI- anions tend to structure with their charged and nonpolar groups in contact with the positive electrode surface when the constraint on these close-contact anions is relaxed. This anion structuring largely retains the cation association near the nanostructured electrode, resulting in only a slight increase in capacitance at positive polarization. Our simulations highlight the sensitive dependence of the innermost ion structure on the electrode surface nanostructure and applied voltage and the resulting influence on ion correlation and capacitance of ionic liquid double layers.
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Affiliation(s)
- Yi-Jung Tu
- Department of Applied Chemistry, National Chi Nan University, Puli, Nantou, 54561, Taiwan.
| | - Sheng-Ting Peng
- Department of Applied Chemistry, National Chi Nan University, Puli, Nantou, 54561, Taiwan.
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2
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Investigation of the protolytic equilibrium of a highly Brønsted acidic ionic liquid and residual water using Raman spectroscopy. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.117796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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3
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Atifi A, Mak PJ, Ryan MD. Ion Pairing versus Solvation of Dinitrobenzene Anions in Room-Temperature Ionic Liquids (RTILs): Vibrational Signatures of RTIL–Substrate Interactions. J Phys Chem A 2020; 124:10225-10238. [DOI: 10.1021/acs.jpca.0c06267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Abderrahman Atifi
- Chemistry Department, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201, United States
| | - Piotr J. Mak
- Chemistry Department, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201, United States
| | - Michael D. Ryan
- Chemistry Department, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201, United States
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Shyama M, Lakshmipathi S. Water confined (H2O) n=1–10 amino acid-based ionic liquids – A DFT study on the bonding, energetics and IR spectra. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112720] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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5
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Verma A, Stoppelman JP, McDaniel JG. Tuning Water Networks via Ionic Liquid/Water Mixtures. Int J Mol Sci 2020; 21:E403. [PMID: 31936347 PMCID: PMC7013630 DOI: 10.3390/ijms21020403] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 12/19/2019] [Accepted: 01/03/2020] [Indexed: 11/17/2022] Open
Abstract
Water in nanoconfinement is ubiquitous in biological systems and membrane materials, with altered properties that significantly influence the surrounding system. In this work, we show how ionic liquid (IL)/water mixtures can be tuned to create water environments that resemble nanoconfined systems. We utilize molecular dynamics simulations employing ab initio force fields to extensively characterize the water structure within five different IL/water mixtures: [BMIM + ][BF 4 - ], [BMIM + ][PF 6 - ], [BMIM + ][OTf - ], [BMIM + ][NO 3 - ]and [BMIM + ][TFSI - ] ILs at varying water fraction. We characterize water clustering, hydrogen bonding, water orientation, pairwise correlation functions and percolation networks as a function of water content and IL type. The nature of the water nanostructure is significantly tuned by changing the hydrophobicity of the IL and sensitively depends on water content. In hydrophobic ILs such as [BMIM + ][PF 6 - ], significant water clustering leads to dynamic formation of water pockets that can appear similar to those formed within reverse micelles. Furthermore, rotational relaxation times of water molecules in supersaturated hydrophobic IL/water mixtures indicate the close-connection with nanoconfined systems, as they are quantitatively similar to water relaxation in previously characterized lyotropic liquid crystals. We expect that this physical insight will lead to better design principles for incorporation of ILs into membrane materials to tune water nanostructure.
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Affiliation(s)
| | | | - Jesse G. McDaniel
- Georgia Institute of Technology, School of Chemistry and Biochemistry, Atlanta 30332-0400, Georgia; (A.V.); (J.P.S.)
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Kavak S, Polat HM, Kulak H, Keskin S, Uzun A. MIL-53(Al) as a Versatile Platform for Ionic-Liquid/MOF Composites to Enhance CO 2 Selectivity over CH 4 and N 2. Chem Asian J 2019; 14:3655-3667. [PMID: 31339661 PMCID: PMC6851973 DOI: 10.1002/asia.201900634] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 06/05/2019] [Indexed: 11/25/2022]
Abstract
Five different imidazolium-based ionic liquids (ILs) were incorporated into a metal-organic framework (MOF), MIL-53(Al), to investigate the effect of IL incorporation on the CO2 separation performance of MIL-53(Al). CO2 , CH4 , and N2 adsorption isotherms of the IL/MIL-53(Al) composites and pristine MIL-53(Al) were measured to evaluate the effect of the ILs on the CO2 /CH4 and CO2 /N2 selectivities of the MOF. Of the composite materials that were tested, [BMIM][PF6 ]/MIL-53(Al) exhibited the largest increase in CO2 /CH4 selectivity, 2.8-times higher than that of pristine MIL-53(Al), whilst [BMIM][MeSO4 ]/MIL-53(Al) exhibited the largest increase in CO2 /N2 selectivity, 3.3-times higher than that of pristine MIL-53(Al). A comparison of the CO2 separation potentials of the IL/MOF composites showed that the [BMIM][BF4 ]- and [BMIM][PF6 ]-incorporated MIL-53(Al) composites both showed enhanced CO2 /N2 and CO2 /CH4 selectivities at pressures of 1-5 bar compared to composites of CuBTC and ZIF-8 with the same ILs. These results demonstrate that MIL-53(Al) is a versatile platform for IL/MOF composites and could help to guide the rational design of new composites for target gas-separation applications.
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Affiliation(s)
- Safiyye Kavak
- Department of Materials Science and EngineeringKoç UniversityRumelifeneri Yolu34450 SariyerIstanbulTurkey
- Koç University TÜPRAŞ Energy Center (KUTEM)Koç UniversityRumelifeneri Yolu34450 SariyerIstanbulTurkey
| | - H. Mert Polat
- Department of Materials Science and EngineeringKoç UniversityRumelifeneri Yolu34450 SariyerIstanbulTurkey
- Koç University TÜPRAŞ Energy Center (KUTEM)Koç UniversityRumelifeneri Yolu34450 SariyerIstanbulTurkey
| | - Harun Kulak
- Department of Chemical and Biological EngineeringKoç UniversityRumelifeneri Yolu34450 SariyerIstanbulTurkey
- Koç University TÜPRAŞ Energy Center (KUTEM)Koç UniversityRumelifeneri Yolu34450 SariyerIstanbulTurkey
| | - Seda Keskin
- Department of Chemical and Biological EngineeringKoç UniversityRumelifeneri Yolu34450 SariyerIstanbulTurkey
- Koç University TÜPRAŞ Energy Center (KUTEM)Koç UniversityRumelifeneri Yolu34450 SariyerIstanbulTurkey
| | - Alper Uzun
- Department of Chemical and Biological EngineeringKoç UniversityRumelifeneri Yolu34450 SariyerIstanbulTurkey
- Koç University TÜPRAŞ Energy Center (KUTEM)Koç UniversityRumelifeneri Yolu34450 SariyerIstanbulTurkey
- Koç University Surface Science and Technology Center (KUYTAM)Koç UniversityRumelifeneri Yolu34450 SariyerIstanbulTurkey
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7
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McDaniel JG, Yethiraj A. Understanding the Properties of Ionic Liquids: Electrostatics, Structure Factors, and Their Sum Rules. J Phys Chem B 2019; 123:3499-3512. [DOI: 10.1021/acs.jpcb.9b00963] [Citation(s) in RCA: 33] [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
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Arun Yethiraj
- Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, Wisconsin 53706, United States
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8
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The influence of chloride and hydrogen sulfate anions in two polymerised ionic liquids based on the poly(1-(hydroxyethyl)-3-vinylimidazolium cation, synthesis, thermal and vibrational studies. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2018.08.032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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9
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Gupta S, Lim TM, Mushrif SH. Insights into the solvation of vanadium ions in the vanadium redox flow battery electrolyte using molecular dynamics and metadynamics. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.03.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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10
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Burba CM, Chang HC. Temperature- and pressure-dependent infrared spectroscopy of 1-butyl-3-methylimidazolium trifluoromethanesulfonate: A dipolar coupling theory analysis. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 193:338-343. [PMID: 29268233 DOI: 10.1016/j.saa.2017.12.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 10/25/2017] [Accepted: 12/04/2017] [Indexed: 06/07/2023]
Abstract
Continued growth and development of ionic liquids requires a thorough understanding of how cation and anion molecular structure defines the liquid structure of the materials as well as the various properties that make them technologically useful. Infrared spectroscopy is frequently used to assess molecular-level interactions among the cations and anions of ionic liquids because the intramolecular vibrational modes of the ions are sensitive to the local potential energy environments in which they reside. Thus, different interaction modes among the ions may lead to different spectroscopic signatures in the vibrational spectra. Charge organization present in ionic liquids, such as 1-butyl-3-methylimidazolium trifluoromethanesulfonate ([C4mim]CF3SO3), is frequently modeled in terms of a quasicrystalline structure. Highly structured quasilattices enable the dynamic coupling of vibrationally-induced dipole moments to produce optical dispersion and transverse optical-longitudinal optical (TO-LO) splitting of vibrational modes of the ionic liquid. According to dipolar coupling theory, the degree of TO-LO splitting is predicted to have a linear dependence on the number density of the ionic liquid. Both temperature and pressure will affect the number density of the ionic liquid and, therefore, the amount of TO-LO splitting for this mode. Therefore, we test these relationships through temperature- and pressure-dependent FT-IR spectroscopic studies of [C4mim]CF3SO3, focusing on the totally symmetric SO stretching mode for the anion, νs(SO3). Increased temperature decreases the amount of TO-LO splitting for νs(SO3), whereas elevated pressure is found to increase the amount of band splitting. In both cases, the experimental observations follow the general predictions of dipolar coupling theory, thereby supporting the quasilattice model for this ionic liquid.
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Affiliation(s)
- Christopher M Burba
- Department of Natural Sciences, Northeastern State University, 611 N. Grand Ave., Tahlequah, OK, United States.
| | - Hai-Chou Chang
- Department of Chemistry, National Dong Hwa University, Taiwan
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11
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Li J, Tang J, Yuan J, Zhang K, Yu X, Sun Y, Zhang H, Qin LC. Porous carbon nanotube/graphene composites for high-performance supercapacitors. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2017.12.052] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Suneetha P, Srinivasa Krishna T, Gowrisankar M, Ramachandran D. Volumetric, acoustic and spectroscopic study of 1-butyl-3-methylimidazolium trifluoromethanesulfonate with alkoxyalkanols at different temperatures. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.04.129] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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13
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Lalitha M, Lakshmipathi S. Interface energetics of [Emim] + [X] − and [Bmim] + [X] − (X = BF 4 , Cl, PF 6 , TfO, Tf 2 N) based ionic liquids on graphene, defective graphene, and graphyne surfaces. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.04.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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14
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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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15
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Figueredo-Sobrinho FAA, Santos LPM, Leite DS, Craveiro DC, Santos SH, Eguiluz KIB, Salazar-Banda GR, Maciel CD, Coutinho-Neto MD, Homem-de-Mello P, de Lima-Neto P, Correia AN. Morphological dependence of silver electrodeposits investigated by changing the ionic liquid solvent and the deposition parameters. Phys Chem Chem Phys 2016; 18:7242-50. [PMID: 26891224 DOI: 10.1039/c5cp06665d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The low toxicity and environmentally compatible ionic liquids (ILs) are alternatives to the toxic and harmful cyanide-based baths used in industrial silver electrodeposition. Here, we report the successful galvanostatic electrodeposition of silver films using the air and water stable ILs 1-ethyl-3-methylimidazolium trifluoromethylsulfonate ([EMIM]TfO) and 1-H-3-methylimidazolium hydrogen sulphate ([HMIM(+)][HSO4(-)]) as solvents and AgTfO as the source of silver. The electrochemical deposition parameters were thoughtfully studied by cyclic voltammetry before deposition. The electrodeposits were characterized by scanning electron microscopy coupled with X-ray energy dispersive spectroscopy and X-ray diffraction. Molecular dynamics (MD) simulations were used to investigate the structural dynamic and energetic properties of AgTfO in both ILs. Cyclic voltammetry experiments revealed that the reduction of silver is a diffusion-controlled process. The morphology of the silver coatings obtained in [EMIM]TfO is independent of the applied current density, resulting in nodular electrodeposits grouped as crystalline clusters. However, the current density significantly influences the morphology of silver electrodeposits obtained in [HMIM(+)][HSO4(-)], thus evolving from dendrites at 15 mA cm(-2) to the coexistence of dendrites and columnar shapes at 30 mA cm(-2). These differences are probably due to the greater interaction of Ag(+) with [HSO4(-)] than with TfO(-), as indicated by the MD simulations. The morphology of Ag deposits is independent of the electrodeposition temperature for both ILs, but higher values of temperature promoted increased cluster sizes. Pure face-centred cubic polycrystalline Ag was deposited on the films with crystallite sizes on the nanometre scale. The morphological dependence of Ag electrodeposits obtained in the [HMIM(+)][HSO4(-)] IL on the current density applied opens up the opportunity to produce different and predetermined Ag deposits.
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Affiliation(s)
- Francisco A A Figueredo-Sobrinho
- Departamento de Química Analítica e Físico-Química, Centro de Ciências, Universidade Federal do Ceará, Bloco 940 Campus do Pici, 60440-900, Fortaleza-CE, Brazil.
| | - Luis P M Santos
- Departamento de Química Analítica e Físico-Química, Centro de Ciências, Universidade Federal do Ceará, Bloco 940 Campus do Pici, 60440-900, Fortaleza-CE, Brazil.
| | - Davi S Leite
- Departamento de Química Analítica e Físico-Química, Centro de Ciências, Universidade Federal do Ceará, Bloco 940 Campus do Pici, 60440-900, Fortaleza-CE, Brazil.
| | - Diego C Craveiro
- Departamento de Química Analítica e Físico-Química, Centro de Ciências, Universidade Federal do Ceará, Bloco 940 Campus do Pici, 60440-900, Fortaleza-CE, Brazil.
| | - Samir H Santos
- Instituto de Tecnologia e Pesquisa/Programa de Pós-Graduação em Engenharia de Processos, Universidade Tiradentes, 49032-490, Aracaju-SE, Brazil
| | - Katlin I B Eguiluz
- Instituto de Tecnologia e Pesquisa/Programa de Pós-Graduação em Engenharia de Processos, Universidade Tiradentes, 49032-490, Aracaju-SE, Brazil
| | - Giancarlo R Salazar-Banda
- Instituto de Tecnologia e Pesquisa/Programa de Pós-Graduação em Engenharia de Processos, Universidade Tiradentes, 49032-490, Aracaju-SE, Brazil
| | - Cleiton D Maciel
- ABCSim, Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Avenida dos Estados, 5001, Bloco B, sala 1017, 09210-580, Santo André-SP, Brazil
| | - Maurício D Coutinho-Neto
- ABCSim, Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Avenida dos Estados, 5001, Bloco B, sala 1017, 09210-580, Santo André-SP, Brazil
| | - Paula Homem-de-Mello
- ABCSim, Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Avenida dos Estados, 5001, Bloco B, sala 1017, 09210-580, Santo André-SP, Brazil
| | - Pedro de Lima-Neto
- Departamento de Química Analítica e Físico-Química, Centro de Ciências, Universidade Federal do Ceará, Bloco 940 Campus do Pici, 60440-900, Fortaleza-CE, Brazil.
| | - Adriana N Correia
- Departamento de Química Analítica e Físico-Química, Centro de Ciências, Universidade Federal do Ceará, Bloco 940 Campus do Pici, 60440-900, Fortaleza-CE, Brazil.
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16
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García G, Atilhan M, Aparicio S. Theoretical Study of Renewable Ionic Liquids in the Pure State and with Graphene and Carbon Nanotubes. J Phys Chem B 2015; 119:12224-37. [DOI: 10.1021/acs.jpcb.5b03809] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gregorio García
- Department
of Chemistry, University of Burgos, 09001 Burgos, Spain
| | - Mert Atilhan
- Department
of Chemical Engineering, Qatar University, P.O. Box 2713, Doha, Qatar
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17
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Affiliation(s)
- Robert Hayes
- Discipline
of Chemistry, The University of Newcastle, NSW 2308, Callaghan, Australia
| | - Gregory G. Warr
- School
of Chemistry, The University of Sydney, NSW 2006, Sydney, Australia
| | - Rob Atkin
- Discipline
of Chemistry, The University of Newcastle, NSW 2308, Callaghan, Australia
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18
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Keaveney ST, Harper JB, Croft AK. Computational approaches to understanding reaction outcomes of organic processes in ionic liquids. RSC Adv 2015. [DOI: 10.1039/c4ra14676j] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The utility of using a combined experimental and computational approach for understanding ionic liquid media, and their effect on reaction outcome, is highlighted through a number of case studies.
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Affiliation(s)
| | - Jason B. Harper
- School of Chemistry
- University of New South Wales
- Sydney
- Australia
| | - Anna K. Croft
- Department of Chemical and Environmental Engineering
- University of Nottingham
- University Park
- Nottingham
- UK
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19
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Reche I, Gallardo I, Guirado G. An Analysis of Anion-Specific Effects on the Standard Potential Shifts of 9-Fluorenone in Room-Temperature Ionic Liquids with a Silver Electrode as a Cathode Material. ChemElectroChem 2014. [DOI: 10.1002/celc.201402243] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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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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