Redox additive aqueous polymer gel electrolyte for an electric double layer capacitor

Senthilkumar, S.; Selvan, R. Kalai; Ponpandian, N.; Melo, Jose Savio

doi:10.1039/c2ra21387g

Cited by 155 publications

(92 citation statements)

References 21 publications

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“…An innovative approach to supercapacitors has recently been developed by the introduction of a single redox additive such as hydroquione [23][24][25], methylene blue [26],p-phenylenediamin [27,28], m-phenylenediamine [29], indigo carmine [30], KI [31][32][33], Na 2 MO 4 [34] or VOSO 4 [35] into the liquid electrolyte or GPE. The specific capacitance and energy density of the supercapacitor are greatly increased as a result of the additional pseudocapacitance deriving from the electron transfer redox reaction of the redox additive.…”

Section: Introductionmentioning

confidence: 99%

Improved energy density of quasi-solid-state supercapacitors using sandwich-type redox-active gel polymer electrolytes

Zhong

Fan

et al. 2015

Electrochimica Acta

118

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Section: Introductionmentioning

confidence: 99%

Improved energy density of quasi-solid-state supercapacitors using sandwich-type redox-active gel polymer electrolytes

Zhong

Fan

et al. 2015

Electrochimica Acta

118

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“…[81] In this case, the capacitances are not only contributed by electrode materials but also contributed from the electrolytes. To date, various redox-active mediators contain organic molecules like hydroquinone (HQ), [82,83] methylene blue (MB), [84] indigo carmine, [85] p-phenylenediamine (PPD), [86] m-phenylenediamine, [87] lignosulfonates, [88] and ionic redox active species like KI, [89,90] VOSO 4 , [91] Na 2 MO 4 , [92] and CuCl 2 [93] have been extensively studied. The GPEs containing redoxactive mediators have been extensively explored in carbonbased supercapacitors, pseudocapacitors, and Li-O 2 battery.…”

Section: Redox-active Gpesmentioning

confidence: 99%

Gel Polymer Electrolytes for Electrochemical Energy Storage

Cheng

Pan

Zhao

et al. 2017

Advanced Energy Materials

780

562

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storage devices with adjustable shapes and high flexibility, which is promising for the burgeoning portable and wearable electronics. [7][8][9] Furthermore, the flexibility and elasticity of GPEs are also prone to tolerate the volume change of electrode materials and the dendrites of lithium metal during charge and discharge processes. [10][11][12][13] As a consequence, GPEs have become one of the most desirable alternatives among various electrolytes for the electrochemical energy storage devices, and significant progress has been made in lithium-ion batteries (LIBs), supercapacitors (SCs), lithium-oxygen (Li-O 2 ) batteries as well as the other kinds of electrochemical energy storage devices, such as sodium-ion batteries, lithium-sulfur batteries, fuel cells, and zinc-air batteries. [14][15][16] In order to meet the requirements of wearable devices for flexibility and deformability, more special GPEs with tough, [17] stretchable, [18] and compressible [19] functionalities have been also developed.Typically, a polymeric framework is adopted in GPEs as host material, providing high mechanical integrity. Several criteria for a good polymer host lie in: [20][21][22] (i) fast segmental motion of polymer chain; (ii) special groups promoting the dissolution of salts; (iii) low glass transition temperature (T g ); (iv) high molecular weight; (v) wide electrochemical window; (vi) high degradation temperature. Within the framework, the salts in the GPEs serve as the sources of the charge carriers, which are generally required to have large anions and low dissociation energy for easier dissociating-induced free/mobile ions. According to the types of electrolytes, there are four categories of GPEs based on proton, [23] alkaline, [24] conducting salts, and ionic liquids (ILs). [25] The criteria for an appropriate electrolyte include: [26][27][28] (i) good dissociation without forming ion pairs or ion aggregation; (ii) high thermal, chemical, and electrochemical stability; (iii) high ionic conductivity. In order to dissolve both the polymer hosts and electrolytic salts, the organic/ aqueous solvents are introduced to provide the medium for ionic conduction. A good solvent should simultaneously have high dielectric constant (ɛ > 15), donor number for more dissociation of ion and chemical and electrochemical stability. Organic solvents normally include ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dimethyl formamide (DMF), dimethyl sulphoxide, ethyl methyl carbonate, and tetrahydrofuran.To prepare a high-performance GPE, it is essential to select the species of host polymer, solvent, and electrolytic salt, and then blend them by solution or melt processes, such as casting With the booming development of flexible and wearable electronics, their safety issues and operation stabilities have attracted worldwide attentions. Compared with traditional liquid electrolytes, gel polymer electrolytes (GPEs) are preferred due to their higher safety and adaptability to the design of ...

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“…Roldan et al 14 reported an increase in capacitance from 320 to 901 F g À 1 by adding hydroquinone to H 2 SO 4 electrolytes. Similarly, Senthilkumar et al 15 used hydroquinone addition into polyvinyl-alcohol H 2 SO 4 gel electrolyte to increase the capacitance from 425 to 941 F g À 1 , and they reported potassium iodide addition into aqueous H 2 SO 4 electrolyte 16 to increase the capacitance from 472 to 912 F g À 1 . These increases in capacitances were attributed to rapid faradaic reactions at the electrode/electrolyte interface that occurred by introducing mediators (hydroquinone/quinine, iodide/iodine pairs) into electrolytes, which augmented the pseudocapacitive contribution to the system.…”

mentioning

confidence: 99%

Synergistic interaction between redox-active electrolyte and binder-free functionalized carbon for ultrahigh supercapacitor performance

et al. 2013

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Development of supercapacitors with high-energy density and high-power density is a tremendous challenge. Although the use of conductive carbon materials is promising, other methods are needed to reach high cyclability, which cannot be achieved by fully utilizing the surface-oxygen redox reactions of carbon. Here we introduce an effective strategy that utilizes Cu 2 þ reduction with carbon-oxygen surface groups of the binder-free electrode in a new redox-active electrolyte. We report a 10-fold increase in the voltammetric capacitance (4,700 F g À 1 ) compared with conventional electrolyte. We measured galvanostatic capacitances of 1,335 F g À 1 with a retention of 99.4% after 5,000 cycles at 60 A g À 1 in a threeelectrode cell and 1,010 F g À 1 in a two-electrode cell. This improvement is attributed to the synergistic effects between surface-oxygen molecules and electrolyte ions as well as the low charge transfer resistance (0.04 O) of the binder-free porous electrode. Our strategy provides a versatile method for designing new energy storage devices and is promising for the development of high-performance supercapacitors for large-scale applications.

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Redox additive aqueous polymer gel electrolyte for an electric double layer capacitor

Cited by 155 publications

References 21 publications

Improved energy density of quasi-solid-state supercapacitors using sandwich-type redox-active gel polymer electrolytes

Improved energy density of quasi-solid-state supercapacitors using sandwich-type redox-active gel polymer electrolytes

Gel Polymer Electrolytes for Electrochemical Energy Storage

Synergistic interaction between redox-active electrolyte and binder-free functionalized carbon for ultrahigh supercapacitor performance

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