Improved performance of electric double layer capacitor using redox additive (VO2+/VO2+) aqueous electrolyte

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

doi:10.1039/c3ta10998d

Cited by 144 publications

(73 citation statements)

References 48 publications

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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

721

556

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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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Section: Redox-active Gpesmentioning

confidence: 99%

Gel Polymer Electrolytes for Electrochemical Energy Storage

Cheng

Pan

Zhao

et al. 2017

Advanced Energy Materials

721

556

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“…However,b iomasses are often chosen as they reduce the precursor cost, because of their availability and the fact that they are renewable. [1,15] Porous carbonsare typicallyprepared by using achemical activation method with activating agents such as ZnCl 2 , KOH, NaOH, and H 3 PO 4 , [1,16] as well as templatea gents like metal-organic frameworks [Zn 4 O(OOCC 6 H4COO) 3 ], silica-based compounds (SBA-15a nd zeolites), and MgO. [1] The literature shows that various biowastes have been identifiedf or the preparation of porous carbons, including coconut shells, [17] rice husks, [18] waste paper, [19] Eichhornia crassipes, [15] tamarindf ruit shells, [14] and banana fibers.…”

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confidence: 99%

Flexible Fiber Supercapacitor Using Biowaste‐Derived Porous Carbon

Senthilkumar

Selvan

2015

ChemElectroChem

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A flexible fiber supercapacitor (SC) was fabricated by using porous carbon as the electrode material and polyvinylalcohol–H3PO4 as the gel‐polymer electrolyte. The porous carbon was derived from dead Ficus religiosa leaves through a single‐step carbonization method and characterized by using BET surface area and TEM analysis as well as XRD, Raman, and FTIR techniques. The fabricated fiber SC works up to 0.8 V and delivers a gravimetric (length) capacitance of 3.4 F g−1 (4.2 mF cm−1) at 1 mA. In addition, it exhibits a maximum gravimetric (length) energy density of 311 mWh kg−1 (37.3×10−8 Wh cm−1) at a power density of 58 W kg−1 (70.3 μW cm−1) with a capacitance retention of 88 % over 4000 cycles.

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“…However, the EDLCs usually have low energy density. Recently, an innovative approach of adding redox species such as VO 2+ /VO 2 + into the electrolytes was used [5]. This technique is very simple and cost effective to improve the performance of EDLCs via electron transfer on the electrode-electrolyte interface through reversible redox reactions.…”

Section: Introductionmentioning

confidence: 99%

Improved performance of supercapacitors constructed with activated carbon papers as electrodes and vanadyl sulfate as redox electrolyte

Zhen

Wen

Guo

et al. 2016

Ionics

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In this report, the supercapacitor was constructed with activated carbon paper as electrodes and 3 M H 2 SO 4 solution bearing 1 M VOSO 4 as electrolyte. This supercapacitor showed high areal capacitance of 2146 mF/ cm 2 with around 16 times higher than that of 134 mF/cm 2 in pristine electrolyte of 3 M H 2 SO 4 and good cycling performance retaining 92 % after 5000 cycles. The full-scale and enlarged Nyquist-type impedance spectra further indicate that the supercapacitor has low diffusion resistance and exhibits good power capability. Constructed by this way, the performances of supercapacitors were improved for the synergistic effect of the absorbance and catalysis of the activated carbon paper as well as redox properties of the couples VO 2+ /VO 2 + .

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Improved performance of electric double layer capacitor using redox additive (VO2+/VO2+) aqueous electrolyte

Cited by 144 publications

References 48 publications

Gel Polymer Electrolytes for Electrochemical Energy Storage

Gel Polymer Electrolytes for Electrochemical Energy Storage

Flexible Fiber Supercapacitor Using Biowaste‐Derived Porous Carbon

Improved performance of supercapacitors constructed with activated carbon papers as electrodes and vanadyl sulfate as redox electrolyte

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