Organo-redox shuttle promoted protic ionic liquid electrolyte for supercapacitor

Sathyamoorthi, Shyam; Suryanarayanan, V.; Velayutham, D.

doi:10.1016/j.jpowsour.2014.10.166

Cited by 93 publications

(72 citation statements)

References 27 publications

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“…1b, to enhance the electrochemical performance of the supercapacitor. It should be notable that unlike other reports dealing with the electrolyte additives [12][13][14][15][16][17][18][19][20][21][22], this study uses the HBU as an additive to active electrode material that influences electrode morphology and its electrochemical performance. The HBU in the composite electrode may contribute to yield a surface morphology with comparatively more compact morphology than the active carbon electrode alone by partially filling the pores between the activated carbon particles (see the surface morphologies in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Of these, quinone and its derivatives have been known as characteristic examples of the organic redox species to involve the increase in the specific capacitance [10]. In particular, hydroquinone/quinone couple was intensively investigated as promising organic additives for electrochemical capacitors in forms of electrode material and electrolyte component [11][12][13][14][15][16][17][18][19][20][21][22] because of cost effectiveness, environmental friendliness, and highly reversible redox reactions. The reversibility of redox reaction is mainly dominated by the reaction mechanism [13,[23][24][25] that hydroquinone is oxidized to quinone by generation of 2H + (two-proton) with 2e À (two-electron) during the charging whereas quinone is reduced to hydroquinone via absorption of 2H + with 2e À during the discharging.…”

Section: Introductionmentioning

confidence: 99%

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Supercapacitive properties of composite electrode consisting of activated carbon and a quinone-containing conducting additive

et al. 2015

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Supercapacitive properties of composite electrode consisting of activated carbon and a quinone-containing conducting additive

et al. 2015

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“…These limitations substantially influence the performance of the supercapacitors, particularly their operating temperature range and operating potential range, hence, specific energy. To overcome these restrictions and to improve supercapacitor performance, a different approach has been adopted to use redox additive added ionic liquid (IL) electrolytes . Sun et al first introduced this approach by adding CuCl 2 in an IL 1‐ethyl‐3‐methylmidazolium tetrabuoroborate (EMImBF 4 ) to use as electrolyte in EDLC.…”

Section: Introductionmentioning

confidence: 99%

Nonaqueous, Redox‐Active Gel Polymer Electrolyte for High‐Performance Supercapacitor

Yadav

Singh

et al. 2019

Energy Tech

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Redox‐active liquid or polymer‐based aqueous electrolytes are widely reported in carbon‐based supercapacitors, enhancing their performance substantially due to the involvement of fast redox reaction(s) at the electrode–electrolyte interface. Here, a nonaqueous, ionic liquid (IL)‐based redox‐active gel polymer electrolyte (GPE) as a potential supercapacitor electrolyte is demonstrated. This electrolyte, comprising IL 1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide added with redox agent NaI, immobilized in poly(vinylidenefluoride‐co‐hexafluoropropylene), offers excellent thermal, mechanical, and electrochemical stability with high ionic conductivity of ≈3.81 × 10−3 S cm−1 at room temperature. The redox‐additive NaI not only increases the ionic conductivity of electrolyte but also introduces redox behavior at the interfaces of porous activated carbon supercapacitor resulting in high specific capacitance (≈334 F g−1) and high specific energy and power (≈26.1 and ≈18 kw kg−1, respectively). The capacitor with redox‐active nonaqueous GPE offers stable performance up to 10 000 charge–discharge cycles with ≈5% initial fading only. This study opens a novel approach to prepare highly stable redox‐active GPEs for high‐performance supercapacitors.

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“…Due to the excellent properties, ILs have been utilized as novel and promising materials in many research fields. For example, ILs can be utilized in energy conversion and energy storage, including solar cells [1][2][3][4][5][6][7], batteries [8][9][10][11][12][13][14][15][16], and supercapacitors [17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Measurements of ionic liquids thermal conductivity and thermal diffusivity

Zhao

Zhen

Jelle

et al. 2016

J Therm Anal Calorim

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Thermal conductivity and thermal diffusivity of ionic liquids (ILs) are investigated in this work. A hot disk method for ILs thermal conductivity and thermal diffusivity measurement is utilized. Firstly, the thermal conductivity of water is measured to check the reliability of the hot disk method. In addition, the thermal conductivity of pure ILs, including BmimBF4, BmimPF6, OmimCl, BmimFeCl4, and OmimFeCl4, is measured. By comparison with thermal conductivity values of water, BmimBF4, and BmimPF6 in the literatures, it is found that the thermal conductivity values of ILs using hot disk method has high reliability. Therefore, the hot disk method is utilized for thermal conductivity measurement of ILs in this work. The experimental results also show that all the average thermal conductivity values of the 5 pure ILs are no more than 0.1898 Wm -1 K -1 , which is much lower than the average measured thermal conductivity of water, namely 0.6033 Wm -1 K -1 . Effect of nanoparticles (NPs) on thermal conductivity of ILs is also investigated.It is shown that the thermal conductivity of BmimBF4 does not change significantly in the presence of 2 diffusivity of water is 0.143 mm 2 s -1 in the literature. It illustrates that the ILs also have a better thermal property than water for energy storage. ILs may be utilized as novel materials for energy storage. Effect of NPs on thermal diffusivity of ILs is also investigated. The results are similar to how NPs influence thermal conductivity of BmimBF4 and BmimPF6. In the presence of Fe2O3 NPs, thermal diffusivity of BmimBF4 does not change significantly. However, in the presence of R711 NPs, thermal diffusivity of BmimPF6 decreases somewhat.

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Organo-redox shuttle promoted protic ionic liquid electrolyte for supercapacitor

Cited by 93 publications

References 27 publications

Supercapacitive properties of composite electrode consisting of activated carbon and a quinone-containing conducting additive

Supercapacitive properties of composite electrode consisting of activated carbon and a quinone-containing conducting additive

Nonaqueous, Redox‐Active Gel Polymer Electrolyte for High‐Performance Supercapacitor

Measurements of ionic liquids thermal conductivity and thermal diffusivity

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