Enhancing 5 V capacitor performance by adding single walled carbon nanotubes into an ionic liquid electrolyte

Kong, Chuiyan; Qian, Weizhong; Zheng, Chao; Wei, Fei

doi:10.1039/c5ta04167h

Cited by 12 publications

(10 citation statements)

References 35 publications

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“…high operating voltage). 26,[34][35][36][37][38][39][40][41][42][43][44] However, higher cell potential can initiate the start of the faradaic processes at the supercapacitor electrodes, leading to the degradation of the materials or even to the burst of the cell body. 1,13,[45][46][47][48][49][50][51][52][53][54][55][56] One of the most electrochemically stable RTILs is 1-ethyl-3-methylimidazolium tetracyanoborate (EMImB(CN) 4 ) having a relatively good conductivity.…”

mentioning

confidence: 99%

The Electrochemical Behavior of 1-Ethyl-3-Methyl Imidazolium Tetracyanoborate Visualized by In Situ X-ray Photoelectron Spectroscopy at the Negatively and Positively Polarized Micro-Mesoporous Carbon Electrode

Kruusma

Tõnisoo

Pärna

et al. 2017

J. Electrochem. Soc.

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The electrochemical properties of the C(Mo 2 C) | EMImB(CN) 4 system have been analyzed using cyclic voltammetry, in situ X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy techniques. The cyclic voltammetry and electrochemical impedance measurements indicated that the tetracyanoborate anions started to electrooxidize and electropolymerize at E = 2.12 V (vs. Ag/AgCl in EMImBF 4 ). However, despite of the formation of compact dielectric polymer layer at the micro-mesoporous C(Mo 2 C) electrode surface very slow electrochemical polymerization of tetracyanoborate anions continued further at E > 2.12 V leading to the blocking of the C(Mo 2 C) electrode porous structure and to the reduction of the electrochemically active surface area necessary for the construction of the high energy density supercapacitors. Thus, the tetracyanoborate anion based ionic liquids can be used as the electrolytes for the initial formation of the passivating solid-electrolyte interface for the very wide cell potential supercapacitor positive electrodes, as an electrolyte additives for the solid-electrolyte interface formation or for the correction of the solid-electrolyte interface damages. Room temperature ionic liquids (RTILs) are remarkable electrolytes (salts) being in a liquid form at or near the room temperature. This means that it is possible to construct the electrical energy storage systems without the need for the solvent characterized usually with high vapor pressure. [1][2][3][4][5][6][7][8][9] The application of the RTILs is also very welcome in the energy technology due to their good electrical conductivity and high electrochemical stability, 10-13 low volatility [14][15][16][17] and relatively high thermal stability. [18][19][20] One class of the electrical energy storing systems, where RTILs can be used, is the electrical double layer capacitors (EDLCs). 10,[21][22][23][24][25][26][27] The EDLCs with very high power and the energy densities are also called as supercapacitors. [28][29][30] Some RTILs and the electrode materials have been investigated and described so far 12,13,22,[24][25][26][27][28][29][30][31][32][33] and the studies of the possible candidates for the supercapacitor materials and the development process of higher power and the energy density systems is still intensive. One way to increase the EDLCs energy density stored is to apply higher cell potentials while the amount of charge stored in a capacitor is proportional to the square of the applied cell potential. [28][29][30]34 Therefore it is of a great interest to study RTILs as possible electrolytes for supercapacitors at high cell potential (i.e. high operating voltage).26,34-44 However, higher cell potential can initiate the start of the faradaic processes at the supercapacitor electrodes, leading to the degradation of the materials or even to the burst of the cell body. 1,13,[45][46][47][48][49][50][51][52][53][54][55][56] One of the most electrochemically stable RTILs is 1-ethyl-3-methylimidazolium tetracyanoborate (EMImB(CN)...

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mentioning

confidence: 99%

The Electrochemical Behavior of 1-Ethyl-3-Methyl Imidazolium Tetracyanoborate Visualized by In Situ X-ray Photoelectron Spectroscopy at the Negatively and Positively Polarized Micro-Mesoporous Carbon Electrode

Kruusma

Tõnisoo

Pärna

et al. 2017

J. Electrochem. Soc.

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“…The physicochemical properties of ionic liquid electrolytes are strongly dependent on the choice of cation/anion couples. [192][193][194][195][196] Ma's group assembled ionic-liquid-based CSs with an operational potential window of 4.0 V by pairing 1-ethyl-3-methylimidazolium (EMIM + ) and BF 4 À /TFSI À ; notably, the energy/power densities in EMIMBF 4…”

Section: Ionic Liquid Electrolytesmentioning

confidence: 99%

Recent advances in carbon-based supercapacitors

et al. 2020

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“…While, ionic liquid usually suffers from high cost, tedious preparation process and environmental issues. [13][14][15] Meanwhile, high temperature molten salt is another widely adopted base solvent system mainly works for the field of high temperature solar collector. 16 However, the high melting point of the salt is the main obstacle as it will inevitably cause the clogging of the flow system at a low temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Traditionally used base solvent can be generally classified into water, mineral oil, and organic alcohol. , As evidenced on their common inherent physical properties, they are quite limited by their relatively short liquid range, which will become invalid under complex temperature conditions or specific device requirements. Ionic liquid, emerging as a new base solvent alternative, has been gaining continuous interest because it is less volatile, has a high boiling point, and is chemically stable, whereas ionic liquids usually suffer from high cost, a tedious preparation process, and environmental issues. − Meanwhile, high temperature molten salt is another widely adopted base solvent system that mainly works for the field of high temperature solar collectors . However, the high melting point of the salt is the main obstacle as it will inevitably cause the clogging of the flow system at a low temperature.…”

Section: Introductionmentioning

confidence: 99%

Novel Silica Filled Deep Eutectic Solvent Based Nanofluids for Energy Transportation

Liu

Fang

Liu

et al. 2019

ACS Sustainable Chem. Eng.

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Liquid range of nanofluids is a crucial parameter as it intensively determines their application temperature scope. Meanwhile, improved thermal conductivity and stability are of great significances and comprise the main fundamental research topics of nanofluids. In this work, 2butoxy-3,4-dihydropyran (DP), produced from a convenient one-pot three-component reaction in water, was employed as dual lipophilic brusher and metal nanoparticle anchor. It was found that DP was able to enhance the dispersing ability and thermal conductivity of SiO 2 nanoparticle filled deep eutectic solvent (DES) based nanofluids simultaneously. The key to the success of this protocol mainly relies on the electrophilic property and acetylacetonate moiety of DP, which ensures the formation of DP surficial modified and copper nanoparticle coated silica. Molecular dynamics simulation revealed that the hydrogen bonding effect between base solvent and alkane chain of nanoparticle was responsible for the enhanced affinity, which thus resulted in an improved stability. Viscosities of the nanofluids dropped within a certain range owing to the ruin of hydrogen bonding association among solvent molecules resulted by the hydrogen bonding effect between nanoparticle and solvent. Thermal conductivity of the copper modified silica filled DES nanofluids exhibits a maximum 13.6% enhancement, which demonstrated the advantages of this chemical covalent protocol. Additionally, study upon viscosity and convective heat transfer coefficient of the nanofluids with varies types of silica nanoparticle and DES base solvents indicated that a 24.9% heat transfer coefficient enhancement was gained that further revealed the superiority of this protocol.

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Enhancing 5 V capacitor performance by adding single walled carbon nanotubes into an ionic liquid electrolyte

Cited by 12 publications

References 35 publications

The Electrochemical Behavior of 1-Ethyl-3-Methyl Imidazolium Tetracyanoborate Visualized by In Situ X-ray Photoelectron Spectroscopy at the Negatively and Positively Polarized Micro-Mesoporous Carbon Electrode

The Electrochemical Behavior of 1-Ethyl-3-Methyl Imidazolium Tetracyanoborate Visualized by In Situ X-ray Photoelectron Spectroscopy at the Negatively and Positively Polarized Micro-Mesoporous Carbon Electrode

Recent advances in carbon-based supercapacitors

Novel Silica Filled Deep Eutectic Solvent Based Nanofluids for Energy Transportation

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