1
|
Coskun OK, Bagbudar Z, Khokhar V, Dongare S, Warburton RE, Gurkan B. Synergistic Effects of the Electric Field Induced by Imidazolium Rotation and Hydrogen Bonding in Electrocatalysis of CO 2. J Am Chem Soc 2024. [PMID: 39143862 DOI: 10.1021/jacs.4c05172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/16/2024]
Abstract
The roles of the ionic liquid (IL), 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]), and water in controlling the mechanism, energetics, and electrocatalytic activity of CO2 reduction to CO on silver in nonaqueous electrolytes were investigated. The first electron transfer occurs to CO2 at reduced overpotentials when it is trapped between the planes of the [EMIM]+ ring and the electrode surface due to cation reorientation as determined from voltammetry, in situ surface-enhanced Raman spectroscopy, and density functional theory calculations. Within this interface, water up to 0.5 M does not induce significant Faradaic activity, opposing the notion of it being a free proton source. Instead, water acts as a hydrogen bond donor, and the proton is sourced from [EMIM]+. Furthermore, this study demonstrates that alcohols with varying acidities tune the hydrogen bonding network in the interfacial microenvironment to lower the energetics required for CO2 reduction. The hydrogen bonding suppresses the formation of inactive carboxylate species, thus preserving the catalytic activity of [EMIM]+. The ability to tune the hydrogen bonding network opens new avenues for advancing IL-mediated electrocatalytic reactions in nonaqueous electrolytes.
Collapse
Affiliation(s)
- Oguz Kagan Coskun
- Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland 44106, Ohio, United States
| | - Zeynep Bagbudar
- Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland 44106, Ohio, United States
| | - Vaishali Khokhar
- Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland 44106, Ohio, United States
| | - Saudagar Dongare
- Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland 44106, Ohio, United States
| | - Robert E Warburton
- Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland 44106, Ohio, United States
| | - Burcu Gurkan
- Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland 44106, Ohio, United States
| |
Collapse
|
2
|
Mullen J, Li H, Atkin R, Silvester DS. Mixing Ionic Liquids Affects the Kinetics and Thermodynamics of the Oxygen/Superoxide Redox Couple in the Context of Oxygen Sensing. ACS PHYSICAL CHEMISTRY AU 2022; 2:515-526. [PMID: 36855608 PMCID: PMC9955187 DOI: 10.1021/acsphyschemau.2c00035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 09/17/2022] [Accepted: 09/19/2022] [Indexed: 11/28/2022]
Abstract
The electrochemical oxygen reduction reaction is vital for applications such as fuel cells, metal air batteries and for oxygen gas sensing. Oxygen undergoes a 1-electron reduction process in dry ionic liquids (ILs) to form the electrogenerated superoxide ion that is solvated and stabilized by IL cations. In this work, the oxygen/superoxide (O2/O2 •-) redox couple has been used to understand the effect of mixing ILs with different cations in the context of developing designer electrolytes for oxygen sensing, by employing cyclic voltammetry at both gold and platinum electrodes. Different cations with a range of sizes, geometries and aromatic/aliphatic character were studied with a common bis(trifluoromethylsulfonyl)imide ([NTf2]-) anion. Diethylmethylsulfonium ([S2,2,1]+), N-butyl-N-methylpyrrolidinum ([C4mpyrr]+) and tetradecyltrihexylphosphonium ([P14,6,6,6]+) cations were mixed with a common 1-butyl-3-methylimidazolium ([C4mim]+) cation at mole fractions (x) of [C4mim]+ of 0, 0.2, 0.4, 0.6, 0.8, and 1. Both the redox kinetics and thermodynamics were found to be highly dependent on the cation structure and the electrode material used. Large deviations from "ideal" mixtures were observed for mixtures of [C4mim][NTf2] with [C4mpyrr][NTf2] on gold electrodes, suggesting a much higher amount of [C4mim]+ ions near the electrode surface despite the large excess of [C4mpyrr]+ in the bulk. The electrical double layer structure was probed for a mixture of [C4mim]0.2[C4mpyrr]0.8[NTf2] using atomic force microscopy measurements on Au, revealing that the first layer was more like [C4mim][NTf2] than [C4mpyrr][NTf2]. Unusually fast kinetics for O2/O2 •- in mixtures of [C4mim]+ with [P14,6,6,6]+ were also observed in the electrochemistry results, which warrants further follow-up studies to elucidate this promising behavior. Overall, it is important to understand the effect on the kinetic and thermodynamic properties of electrochemical reactions when mixing solvents, to aid in the creation of designer electrolytes with favorable properties for their intended application.
Collapse
Affiliation(s)
- Jesse
W. Mullen
- School
of Molecular and Life Sciences, Curtin University, GPO Box U1987, Perth, Western
Australia 6845, Australia
| | - Hua Li
- School
of Molecular Sciences, The University of
Western Australia, Perth, Western Australia 6009, Australia,Centre
for Microscopy, Characterisation and Analysis, The University of Western Australia, Perth, Western Australia 6009, Australia
| | - Rob Atkin
- School
of Molecular Sciences, The University of
Western Australia, Perth, Western Australia 6009, Australia
| | - Debbie S. Silvester
- School
of Molecular and Life Sciences, Curtin University, GPO Box U1987, Perth, Western
Australia 6845, Australia,. Tel.: +61-08-9266-7148. Fax: +61-08-9266-2300
| |
Collapse
|
3
|
Hydrogen Bond Donors Influence on the Electrochemical Performance of Composite Graphene Electrodes/Deep Eutectic Solvents Interface. ELECTROCHEM 2022. [DOI: 10.3390/electrochem3010009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The development of energy storage devices with better performance relies on the use of innovative materials and electrolytes, aiming to reduce the carbon footprint through the screening of low toxicity electrolytes and solvent-free electrode design protocols. The application of nanostructured carbon materials with high specific surface area, to prepare composite electrodes, is being considered as a promising starting point towards improving the power and energy efficiency of energy storage devices. Non-aqueous electrolytes synthesized using greener approaches with lower environmental impact make deep eutectic solvents (DES) promising alternatives for electrochemical energy storage and conversion applications. Accordingly, this work proposes a systematic study on the effect of the composition of DES containing a diol and an amide as HBD (hydrogen bond donor: 1,2-propylene glycol and urea), on the electrochemical performance of graphene and graphite composite electrodes/DES electrolyte interface. Glassy carbon (GC) was selected as the bare electrode material substrate to prepare the composite formulations since it provides an electrochemically reproducible surface. Gravimetric capacitance was measured for commercial graphene and commercial graphite/GC composite electrodes in contact with choline chloride, complexed with 1,2-propylene glycol, and urea as the HBD in 1:2 molar ratio. The electrochemical stability was followed by assessing the charge/discharge curves at 1, 2, and 4 A g−1. For comparison purposes, a parallel study was performed using commercial graphite. A four-fold increase in gravimetric capacitance was obtained when replacing commercial graphite (1.70 F g−1) by commercial graphene (6.19 F g−1) in contact with 1,2-propylene glycol-based DES. When using urea based DES no significant change in gravimetric capacitance was observed when commercial graphite is replaced by commercial graphene.
Collapse
|
4
|
Wang Y, Tian G. The Influence of Anion Structure on the Ionic Liquids/Au (100) Interface by Molecular Dynamics Simulations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:14059-14071. [PMID: 34797668 DOI: 10.1021/acs.langmuir.1c02129] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The microstructure of electrical double layers (EDLs) of 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4), 1-butyl-3-methylimidazoliumhexafluorophosphate ([Bmim]PF6), and 1-butyl-3-methylimidazoliumbis (trifluoromethylsulfonyl) imide ([Bmim]TFSI) were studied by quantum chemical calculation and molecular dynamics simulation. For the set of ionic liquids investigated here, we found some interesting universal laws due to differences geometry and electronic structure of anions. We show that the morphology of the three anions on the electrode surface is different due to the different geometric structure. The plane formed by the bottom three atoms of the symmetrically tetrahedral BF4- and the bottom atom of the symmetrically octahedral PF6- face the electrode whether the electrode is charged or not, while the conformation of twisted V-shaped TFSI- changes with different surface charges on the electrode. Meanwhile, we also demonstrate that the energy of highest occupied molecular orbital (EHOMO), the energy of lowest unoccupied molecular orbital (ELUMO) and their energies gap (ΔE) are very interesting due to different electronic structure of anions. Specially, the EHOMO, ELUMO, and ΔE were related to the electronegativity of the central atom in the case of the same symmetry on the neutral surface. The more electronegative the central atom is, the lower EHOMO, ELUMO and higher ΔE values are. However, on the charged surface, the interaction between anion and electrode is opposite to ΔE. Moreover, different arrangements of anion and cation are related to the interaction between particles. The stronger interaction leads a double-row structure and the weak interaction lead worm-like and island patterns on Au (100) surface. In general, we observed that the higher ΔE cause stronger interaction, which lead to different patterns on Au (100) surface. Meanwhile, we also confirmed that the stronger interaction between particles and electrode lead to the thinner effective EDL and a large differential capacitance value. These results provide a new perspective for double-layer structure in atomic and molecular level. This is helpful to deepen the understanding of the interface phenomena and characteristics of [Bmim]BF4, [Bmim]PF6, and [Bmim]TFSI on Au (100) system and provide theoretical basis for the application of these kind of systems.
Collapse
Affiliation(s)
- Yue Wang
- State Key Laboratory of Complex Non-ferrous Metal Resource Clean Utilization, Kunming University of Science and Technology, Yunnan, Kunming 650093, China
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, China
- Yunnan Open University, Kunming, 650223, China
| | - Guocai Tian
- State Key Laboratory of Complex Non-ferrous Metal Resource Clean Utilization, Kunming University of Science and Technology, Yunnan, Kunming 650093, China
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| |
Collapse
|
5
|
Wang YL, Li B, Sarman S, Mocci F, Lu ZY, Yuan J, Laaksonen A, Fayer MD. Microstructural and Dynamical Heterogeneities in Ionic Liquids. Chem Rev 2020; 120:5798-5877. [PMID: 32292036 PMCID: PMC7349628 DOI: 10.1021/acs.chemrev.9b00693] [Citation(s) in RCA: 192] [Impact Index Per Article: 48.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Indexed: 12/11/2022]
Abstract
Ionic liquids (ILs) are a special category of molten salts solely composed of ions with varied molecular symmetry and charge delocalization. The versatility in combining varied cation-anion moieties and in functionalizing ions with different atoms and molecular groups contributes to their peculiar interactions ranging from weak isotropic associations to strong, specific, and anisotropic forces. A delicate interplay among intra- and intermolecular interactions facilitates the formation of heterogeneous microstructures and liquid morphologies, which further contributes to their striking dynamical properties. Microstructural and dynamical heterogeneities of ILs lead to their multifaceted properties described by an inherent designer feature, which makes ILs important candidates for novel solvents, electrolytes, and functional materials in academia and industrial applications. Due to a massive number of combinations of ion pairs with ion species having distinct molecular structures and IL mixtures containing varied molecular solvents, a comprehensive understanding of their hierarchical structural and dynamical quantities is of great significance for a rational selection of ILs with appropriate properties and thereafter advancing their macroscopic functionalities in applications. In this review, we comprehensively trace recent advances in understanding delicate interplay of strong and weak interactions that underpin their complex phase behaviors with a particular emphasis on understanding heterogeneous microstructures and dynamics of ILs in bulk liquids, in mixtures with cosolvents, and in interfacial regions.
Collapse
Affiliation(s)
- Yong-Lei Wang
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Bin Li
- School
of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, P. R. China
| | - Sten Sarman
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Francesca Mocci
- Department
of Chemical and Geological Sciences, University
of Cagliari, I-09042 Monserrato, Italy
| | - Zhong-Yuan Lu
- State
Key Laboratory of Supramolecular Structure and Materials, Institute
of Theoretical Chemistry, Jilin University, Changchun 130021, P. R. China
| | - Jiayin Yuan
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Aatto Laaksonen
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
- State
Key Laboratory of Materials-Oriented and Chemical Engineering, Nanjing Tech University, Nanjing 210009, P. R. China
- Centre of
Advanced Research in Bionanoconjugates and Biopolymers, Petru Poni Institute of Macromolecular Chemistry Aleea Grigore Ghica-Voda, 41A, 700487 Iasi, Romania
- Department
of Engineering Sciences and Mathematics, Division of Energy Science, Luleå University of Technology, SE-97187 Luleå, Sweden
| | - Michael D. Fayer
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
| |
Collapse
|
6
|
Electric double layer structure and capacitance of imidazolium-based ionic liquids with FSI− and Tf− anions at graphite electrode by molecular dynamic simulations. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.113452] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
7
|
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]
|
8
|
Lu BQ, Li M, Zhang XW, Huang CM, Wu XY, Fang Q. Immobilization of uranium into magnetite from aqueous solution by electrodepositing approach. JOURNAL OF HAZARDOUS MATERIALS 2018; 343:255-265. [PMID: 28965015 DOI: 10.1016/j.jhazmat.2017.09.037] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 08/12/2017] [Accepted: 09/21/2017] [Indexed: 06/07/2023]
Abstract
Immobilization of uranium into magnetite (Fe3O4), which was generated from metallic iron by electrochemical method, was proposed to rapidly remove uranium from aqueous solution. The effects of electrochemical parameters such as electrode materials, voltage, electrode gap, reaction time and pH value on the crystallization of Fe3O4 and uranium removal efficiencies were investigated. More than 90% uranium in the solution was precipitated with Fe3O4 under laboratory conditions when uranium concentration range from 0.5mg/L to 10mg/L. The Fe3O4 crystallization mechanism and immobilization of uranium was proved by XPS, XRD, TEM, FTIR and VSM methods. The results indicated that the cationic (including Fe2+, Fe3+ and U(VI)) migrate to cathode side under the electric field and the uranium was incorporated or adsorbed by Fe3O4 which was generated at cathode while the pH ranges between 2-7. The uranium-containing precipitate of Fe3O4 can exist stably at the acid concentration below 60g/L. Furthermore, the precipitate may be used as valuable resources for uranium or iron recycling, which resulted in no secondary pollution in the removal of uranium from aqueous solution.
Collapse
Affiliation(s)
- Bing-Qing Lu
- School of Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China
| | - Mi Li
- School of Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China; Key Laboratory of Radioactive Waste Treatment and Disposal, University of South China, Hengyang 421001, China.
| | - Xiao-Wen Zhang
- School of Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China; Key Laboratory of Radioactive Waste Treatment and Disposal, University of South China, Hengyang 421001, China
| | - Chun-Mei Huang
- School of Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China
| | - Xiao-Yan Wu
- School of Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China; Key Laboratory of Radioactive Waste Treatment and Disposal, University of South China, Hengyang 421001, China
| | - Qi Fang
- School of Environmental Protection and Safety Engineering, University of South China, Hengyang 421001, China; Key Laboratory of Radioactive Waste Treatment and Disposal, University of South China, Hengyang 421001, China
| |
Collapse
|
9
|
Voroshylova IV, Ferreira ESC, Malček M, Costa R, Pereira CM, Cordeiro MNDS. Influence of the anion on the properties of ionic liquid mixtures: a molecular dynamics study. Phys Chem Chem Phys 2018; 20:14899-14918. [DOI: 10.1039/c8cp01541d] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Big anions enhance the non-polar network in IL mixtures, while smaller ones win the competition for the imidazolium cation.
Collapse
Affiliation(s)
- Iuliia V. Voroshylova
- LAQV@REQUIMTE
- Faculdade de Ciências
- Universidade do Porto
- Departamento de Química e Bioquímica
- Rua do Campo Alegre
| | - Elisabete S. C. Ferreira
- LAQV@REQUIMTE
- Faculdade de Ciências
- Universidade do Porto
- Departamento de Química e Bioquímica
- Rua do Campo Alegre
| | - Michal Malček
- LAQV@REQUIMTE
- Faculdade de Ciências
- Universidade do Porto
- Departamento de Química e Bioquímica
- Rua do Campo Alegre
| | - Renata Costa
- CIQUP – Physical Analytical Chemistry and Electrochemistry group
- Faculdade de Ciências
- Universidade do Porto
- Departamento de Química e Bioquímica
- Rua do Campo Alegre
| | - Carlos M. Pereira
- CIQUP – Physical Analytical Chemistry and Electrochemistry group
- Faculdade de Ciências
- Universidade do Porto
- Departamento de Química e Bioquímica
- Rua do Campo Alegre
| | - M. Natália D. S. Cordeiro
- LAQV@REQUIMTE
- Faculdade de Ciências
- Universidade do Porto
- Departamento de Química e Bioquímica
- Rua do Campo Alegre
| |
Collapse
|
10
|
Lucio AJ, Shaw SK. Effects and controls of capacitive hysteresis in ionic liquid electrochemical measurements. Analyst 2018; 143:4887-4900. [DOI: 10.1039/c8an01085d] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Capacitance vs. potential relationships help electrochemists better understand electrode–liquid interfacial behaviors.
Collapse
Affiliation(s)
| | - Scott K. Shaw
- Department of Chemistry
- University of Iowa
- Iowa City
- USA
| |
Collapse
|
11
|
Costa R, Voroshylova IV, Cordeiro MND, Pereira CM, Silva AF. Enhancement of differential double layer capacitance and charge accumulation by tuning the composition of ionic liquids mixtures. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2017.12.134] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
|
12
|
Wippermann K, Giffin J, Kuhri S, Lehnert W, Korte C. The influence of water content in a proton-conducting ionic liquid on the double layer properties of the Pt/PIL interface. Phys Chem Chem Phys 2017; 19:24706-24723. [PMID: 28861561 DOI: 10.1039/c7cp04003b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The influence of the water content of 2-sulfoethylmethylammonium trifluoromethanesulfonate [2-Sema][TfO] on the double layer properties of the interface of platinum and the proton conducting ionic liquid (PIL) is investigated by means of impedance spectroscopy and cyclic voltammetry. By fitting the impedance spectra as complex capacitances, up to four differential double layer capacitances and corresponding time constants are obtained, depending on the potential (U = 0-1.6 V/RHE), water content (0.7-6.1 wt%) and temperature (T = 70-110 °C). Within the whole potential range investigated, a high frequency capacitance, C1, and a low frequency capacitance, C2, can be calculated. In the potential region of hydrogen underpotential deposition (HUPD), C1 can be separated into two parts, C1a and C1b. Whereas the high frequency capacitive processes can mainly be attributed to ion transport processes in the double layer, the low frequency process is ascribed to changes in the interfacial layer, including ad-/desorption and Faradaic processes. Alternative interpretations regarding the reorientation of ions, reconstruction of the metal surface and partial electron transfer between anions and Pt are considered.
Collapse
Affiliation(s)
- K Wippermann
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research - Fuel Cells (IEK-3), 52425 Jülich, Germany.
| | | | | | | | | |
Collapse
|
13
|
Sebastián P, Botello LE, Vallés E, Gómez E, Palomar-Pardavé M, Scharifker BR, Mostany J. Three-dimensional nucleation with diffusion controlled growth: A comparative study of electrochemical phase formation from aqueous and deep eutectic solvents. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2016.12.014] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
14
|
Vatamanu J, Bedrov D, Borodin O. On the application of constant electrode potential simulation techniques in atomistic modelling of electric double layers. MOLECULAR SIMULATION 2017. [DOI: 10.1080/08927022.2017.1279287] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Jenel Vatamanu
- Materials Science & Engineering Department, University of Utah, Salt Lake City, UT, USA
- Electrochemistry Branch, Sensors and Electron Devices Directorate, Army Research Laboratory, Adelphi, MD, USA
| | - Dmitry Bedrov
- Materials Science & Engineering Department, University of Utah, Salt Lake City, UT, USA
| | - Oleg Borodin
- Electrochemistry Branch, Sensors and Electron Devices Directorate, Army Research Laboratory, Adelphi, MD, USA
| |
Collapse
|
15
|
Vatamanu J, Vatamanu M, Borodin O, Bedrov D. A comparative study of room temperature ionic liquids and their organic solvent mixtures near charged electrodes. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:464002. [PMID: 27623976 DOI: 10.1088/0953-8984/28/46/464002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The structural properties of electrolytes consisting of solutions of ionic liquids in a polar solvent at charged electrode surfaces are investigated using classical atomistic simulations. The studied electrolytes consisted of tetraethylammonium tetrafluoroborate (NEt4-BF4), 1-ethyl-3-methylimidazolium tetrafluoroborate (c2mim-BF4) and 1-octyl-3-methylimidazolium tetrafluoroborate (c8mim-BF4) salts dissolved in acetonitrile solvent. We discuss the influence of electrolyte concentration, chemical structure of the ionic salt, temperature, conducting versus semiconducting nature of the electrode, electrode geometry and surface roughness on the electric double layer structure and capacitance and compare these properties with those obtained for pure room temperature ionic liquids. We show that electrolytes consisting of solutions of ions can behave quite differently from pure ionic liquid electrolytes.
Collapse
Affiliation(s)
- Jenel Vatamanu
- University of Utah, MSE Department, Salt Lake City, UT 84112, USA
| | | | | | | |
Collapse
|
16
|
Li Z, Hu X, Xiong D, Li B, Wang H, Li Q. Facile synthesis of bicontinuous microporous/mesoporous carbon foam with ultrahigh specific surface area for supercapacitor application. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.10.028] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
17
|
Yu Y, Li Z. Influence of droplet coverage on the electrochemical response of planar microelectrodes and potential solving strategies based on nesting concept. PeerJ 2016; 4:e2400. [PMID: 27635356 PMCID: PMC5012334 DOI: 10.7717/peerj.2400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 08/03/2016] [Indexed: 11/20/2022] Open
Abstract
Recently, biosensors have been widely used for the detection of bacteria, viruses and other toxins. Electrodes, as commonly used transducers, are a vital part of electrochemical biosensors. The coverage of the droplets can change significantly based on the hydrophobicity of the microelectrode surface materials. In the present research, screen-printed interdigitated microelectrodes (SPIMs), as one type of planar microelectrode, were applied to investigate the influence of droplet coverage on electrochemical response. Furthermore, three dimensional (3D) printing technology was employed to print smart devices with different diameters based on the nesting concept. Theoretical explanations were proposed to elucidate the influence of the droplet coverage on the electrochemical response. 3D-printed ring devices were used to incubate the SPIMs and the analytical performances of the SPIMs were tested. According to the results obtained, our device successfully improved the stability of the signal responses and eliminated irregular signal changes to a large extent. Our proposed method based on the nesting concept provides a promising method for the fabrication of stable electrochemical biosensors. We also introduced two types of electrode bases to improve the signal stability.
Collapse
Affiliation(s)
- Yue Yu
- Department of Biosystems Engineering, Zhejiang University , Hangzhou , China
| | - Zhanming Li
- Department of Biosystems Engineering, Zhejiang University, Hangzhou, China; Department of Food Science, College of Life Science, China Jiliang University, Hangzhou, China
| |
Collapse
|
18
|
Voroshylova IV, Teixeira F, Costa R, Pereira CM, Cordeiro MNDS. Interactions in the ionic liquid [EMIM][FAP]: a coupled experimental and computational analysis. Phys Chem Chem Phys 2016; 18:2617-28. [DOI: 10.1039/c5cp06027c] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
IR spectroscopy and DFT calculations were combined to explore the anion conformers and access the hydrogen-bonding phenomenon in RTIL [EMIM][FAP].
Collapse
Affiliation(s)
- Iuliia V. Voroshylova
- CIQ(UP)
- Faculdade de Ciências da Universidade do Porto
- Departamento de Química e Bioquímica
- 4169-007 Porto
- Portugal
| | - Filipe Teixeira
- LAQV@REQUIMTE
- Faculdade de Ciências
- Universidade do Porto
- Departamento de Química e Bioquímica
- 4169-007 Porto
| | - Renata Costa
- CIQ(UP)
- Faculdade de Ciências da Universidade do Porto
- Departamento de Química e Bioquímica
- 4169-007 Porto
- Portugal
| | - Carlos M. Pereira
- CIQ(UP)
- Faculdade de Ciências da Universidade do Porto
- Departamento de Química e Bioquímica
- 4169-007 Porto
- Portugal
| | - M. Natália D. S. Cordeiro
- LAQV@REQUIMTE
- Faculdade de Ciências
- Universidade do Porto
- Departamento de Química e Bioquímica
- 4169-007 Porto
| |
Collapse
|
19
|
Vatamanu J, Ni X, Liu F, Bedrov D. Tailoring graphene-based electrodes from semiconducting to metallic to increase the energy density in supercapacitors. NANOTECHNOLOGY 2015; 26:464001. [PMID: 26511198 DOI: 10.1088/0957-4484/26/46/464001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The semiconducting character of graphene and some carbon-based electrodes can lead to noticeably lower total capacitances and stored energy densities in electric double layer (EDL)capacitors. This paper discusses the chemical and electronic structure modifications that enhance the available energy bands, density of states and quantum capacitance of graphene substrates near the Fermi level, therefore restoring the conducting character of these materials. The doping of graphene with p or n dopants, such as boron and nitrogen atoms, or the introduction of vacancy defects that introduce zigzag edges, can significantly increase the quantum capacitance within the potential range of interest for the energy storage applications by either shifting the Dirac point away from the Fermi level or by eliminating the Dirac point. We show that a combination of doping and vacancies at realistic concentrations is sufficient to increase the capacitance of a graphene-based electrode to within 1 μF cm(−2) from that of a metallic surface.Using a combination of ab initio calculations and classical molecular dynamics simulations we estimate how the changes in the quantum capacitance of these electrode materials affect the total capacitance stored by the open structure EDL capacitors containing room temperature ionic liquid electrolytes.
Collapse
|
20
|
Abstract
Capacitive energy storage devices are receiving increasing experimental and theoretical attention due to their enormous potential for energy applications. Current research in this field is focused on the improvement of both the energy and the power density of supercapacitors by optimizing the nanostructure of porous electrodes and the chemical structure/composition of the electrolytes. However, the understanding of the underlying correlations and the mechanisms of electric double layer formation near charged surfaces and inside nanoporous electrodes is complicated by the complex interplay of several molecular scale phenomena. This Perspective presents several aspects regarding the experimental and theoretical research in the field, discusses the current atomistic and molecular scale understanding of the mechanisms of energy and charge storage, and provides a brief outlook to the future developments and applications of these devices.
Collapse
Affiliation(s)
- Jenel Vatamanu
- Department of Materials Science & Engineering, The University of Utah , 122 S. Central Campus Drive, Salt Lake City, Utah 84112, United States
| | - Dmitry Bedrov
- Department of Materials Science & Engineering, The University of Utah , 122 S. Central Campus Drive, Salt Lake City, Utah 84112, United States
| |
Collapse
|
21
|
Insight on the effect of surface modification by carbon materials on the Ionic Liquid Electric Double Layer Charge Storage properties. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.06.142] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
22
|
Kerner M, Plylahan N, Scheers J, Johansson P. Ionic liquid based lithium battery electrolytes: fundamental benefits of utilising both TFSI and FSI anions? Phys Chem Chem Phys 2015; 17:19569-81. [DOI: 10.1039/c5cp01891a] [Citation(s) in RCA: 124] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synergetic effects of FSI–TFSI mixed electrolytes?
Collapse
Affiliation(s)
- M. Kerner
- Department of Applied Physics
- Chalmers University of Technology
- SE-41296 Gothenburg
- Sweden
| | - N. Plylahan
- Department of Applied Physics
- Chalmers University of Technology
- SE-41296 Gothenburg
- Sweden
| | - J. Scheers
- Department of Applied Physics
- Chalmers University of Technology
- SE-41296 Gothenburg
- Sweden
| | - P. Johansson
- Department of Applied Physics
- Chalmers University of Technology
- SE-41296 Gothenburg
- Sweden
| |
Collapse
|