Improved Performance of Ionic Liquid Supercapacitors by using Tetracyanoborate Anions

Martins, Vitor L.; Rennie, Anthony J. R.; Sánchez‐Ramírez, Nedher; Torresi, Roberto M.; Hall, Peter

doi:10.1002/celc.201701164

Cited by 36 publications

(19 citation statements)

References 48 publications

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“…[49y], [54e], [55o], Especially the latter field has attracted considerable interest and TCB ‐ILs have been used as component of the electrolytes of dye‐sensitized solar cells (DSSC, Grätzel cell), batteries,[56k], and supercapacitors. [49l], [58c], [58d], In 2006 Grätzel et al . reported on the high efficiency for IL‐based DSS cells with [EMIm][B(CN) 4 ].…”

Section: Tetracyanoborates (Kttcb)mentioning

confidence: 99%

Cyanoborates

Ignat’ev

Finze

2019

Eur J Inorg Chem

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Cyanoborate chemistry has emerged to an important topic during the last two decades, beginning with two independent reports on the successful synthesis of the tetracyanoborate anion [B(CN) 4 ]in 2000. A wealth of cyanoborate anions with different substituents in addition to CN group(s) bonded to boron, i.e. hydrogen, halogen, aryl, alkenyl, alkyl, perfluoroalkyl, and alkoxy, have been developed, which enable the tuning of properties of compounds and materials based on them. The readily accessible alkali metal cyanoborates are convenient starting materials for the preparation of cyanoborates with various organic, inorganic, and metal cations as well as cyanoborate coordination compounds. A focus has been on low-[a] Julius-Maximilians-Universität Würzburg,

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Section: Tetracyanoborates (Kttcb)mentioning

confidence: 99%

Cyanoborates

Ignat’ev

Finze

2019

Eur J Inorg Chem

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“…The major problem with the development of cost-efficient, flexible, and portable ESs is the lower energy density especially as compared to those of rechargeable batteries. , The energy density of a supercapacitor system is proportional to the specific capacitance and square of the operating voltage ( E = 1/2 CV 2 , where C = specific capacitance and V = operating voltage), , so it is clear that the total energy density of ESs can be improved with the combination of an enhanced specific capacitance and a wider operating voltage. In general, a high operating voltage is obtained by connecting several supercapacitor cells in series, but this reduces the total capacitance and increases the resistance as there is always a trade-off between working voltage and the capacitance.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Tungsten Oxide/Selenium Nanocomposite Fabricated for Flexible Supercapacitors with Higher Operational Voltage and Their Charge Storage Mechanism

Barik

Yadav

Jha

et al. 2021

ACS Appl. Mater. Interfaces

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The present work elaborates the high-energy-density, stable, and flexible supercapacitor devices (full-cell configuration with asymmetric setup) based on a two-dimensional tungsten oxide/selenium (2D WO 3 /Se) nanocomposite. For this, the 2D WO 3 /Se nanocomposite synthesized by a hydrothermal method followed by air annealing was coated on a flexible carbon cloth current collector and combined separately with both 0.1 M H 2 SO 4 and 1-butyl-3-methyl imidazolium tetrafluoroborate room temperature ionic liquid (BmimBF 4 RTIL) as electrolyte. Different physicochemical characterization techniques, viz., transmission electron microscopy, scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy, are utilized for phase confirmation and morphology identification of the obtained samples. The electrochemical analysis was used to evaluate charge storage mechanism. The half-cell configuration (three electrode system) in 0.1 M H 2 SO 4 shows a specific capacitance of 564 F g −1 at 6 A g −1 current density, whereas with ionic liquid as electrolyte, a higher specific capacitance of 1650 F g −1 was obtained at a higher current of 40 mA and working potential of 4 V. Importantly, the asymmetric flexible supercapacitor device with PVA−H 2 SO 4 electrolyte shows a working voltage of 1.7 V. A specific capacitance of 858 mF g −1 is obtained for the asymmetric electrode system with an energy density of 47 mWh kg −1 and a power density of 345 mW kg −1 at a current density of 0.2 A g −1 .

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“…In recent years, the structures and properties of the ionic liquid–electrode system have been revealed by experimental technologies, electrochemical methods, − atomic force microscopy (AFM), ,, scanning tunneling microscopy (STM), − and spectroscopy technology (surface-enhanced Raman spectroscopy, , infrared spectroscopy, sum-frequency spectroscopy, − etc.). Meanwhile, the capacitance curve shape and the surface adsorption state of the system are also discussed.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Interface Structure of 1-Ethyl-2,3-alkylimidazolium Bis(trifluoromethylsulfonyl)imide on a Au(111) Surface with Molecular Dynamics Simulations

et al. 2021

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As a new type of green electrolyte, ionic liquids have been extensively and successfully used in electrochemical systems. It is extremely important to understand the structure and characteristics of their electric double layers. The microscopic structures of room-temperature ionic liquids 1-ethyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide ([Emmim]TFSI) and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Emim]TFSI) were studied on a flat Au(111) surface using molecular dynamics simulations. Since the interactions of [Emmim]TFSI, [Emmim] + , and TFSI − with the Au(111) surface are stronger than those of molecules (or ions) in the [Emim]TFSI system, the linear arrangement of [Emmim]TFSI and the worm-like pattern of the [Emim]TFSI system can be found near the Au(111) surface. Meanwhile, cations are all parallel to the electrode in the [Emmim]TFSI/Au(111) system and tilted toward the surface in the [Emim]TFSI/Au(111) system. TFSI − presents trans and cis conformations in [Emim]TFSI and [Emmim]TFSI systems adjacent to Au( 111), respectively. A Helmholtz-like layer structure with alternating oscillations of anionic and cationic layers can be found in the [Emim]TFSI system, while the molecular layer with cations and anions existing simultaneously can be found in [Emmim]TFSI. Our results confirm that the substitution of hydrogen on C1 by methyl groups in the imidazole ring increases the interaction between the particles. It has also been proved that the change in the anion conformation and cation orientation in the [Emmim]TFSI system can be attributed to the different interaction energies of various particles. The above reasons ultimately make the images on Au(111) different in the two systems. The results provide a new perspective for studying the structure of double layers. They are helpful in deepening the understanding of the interface behavior of ionic liquids and providing a theoretical basis for the design of functional ionic liquids that are suitable for electrochemical equipment.

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Improved Performance of Ionic Liquid Supercapacitors by using Tetracyanoborate Anions

Cited by 36 publications

References 48 publications

Cyanoborates

Cyanoborates

Two-Dimensional Tungsten Oxide/Selenium Nanocomposite Fabricated for Flexible Supercapacitors with Higher Operational Voltage and Their Charge Storage Mechanism

Characterization of the Interface Structure of 1-Ethyl-2,3-alkylimidazolium Bis(trifluoromethylsulfonyl)imide on a Au(111) Surface with Molecular Dynamics Simulations

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