High performance quasi-solid-state supercapacitors with peanut-shell-derived porous carbon

Yadav, Neetu; Singh, Manoj K.; Yadav, Nitish; Hashmi, S.A.

doi:10.1016/j.jpowsour.2018.09.032

Cited by 108 publications

(56 citation statements)

References 80 publications

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“…The specific energy of the Cell#1 has been estimated from the expression E = ½ C d V 2 , used for conventional EDLCs, whereas specific energy for Cell#2 (having nonlinear discharge characteristics) has been estimated from

E = (i \int V dt) / (2 \times m)

. The maximum and effective specific power ( P max and P eff ) have been evaluated by

P_{max} = V^{2} / (8 m \times ESR)

P_{eff} = E / t_{discharge}

where ESR is the equivalent series resistance of the cells, evaluated using the expression ESR = Δ V /2 i . Typical values of specific energy ( E ) and maximum specific power ( P max ) have been found to be ≈11.8 and ≈26.1 Wh kg −1 , and ≈6.3 and ≈18 kW kg −1 , respectively, for Cell#1 (without redox additive) and Cell#2 (with redox additive), evaluated at current density ≈0.84 A g −1 .…”

Section: Resultsmentioning

confidence: 99%

“…The activated carbon powder, used as active electrode material for EDLC fabrication, was derived from biowaste peanut shells. Details of preparation procedure are given by us elsewhere . To prepare the EDLC‐electrodes, a mixture of AC powder, graphite powder, and binder (PVdF‐HFP) in the ratio of 80:10:10 (w/w) was thoroughly grounded with NMP in an agate mortar pestle to form a homogenous slurry.…”

Section: Methodsmentioning

confidence: 99%

“…Electrolyte is an important component, whose properties like ionic conductivity and thermal, chemical, and electrochemical stabilities play significant role in the performance of supercapacitors . Aqueous, organic, or room temperature ionic liquid (RTIL)‐based liquid electrolytes are generally used in supercapacitors, as indicated by numerous reports existing in literature, and every such electrolyte has certain merits and demerits . Demerits of liquid electrolytes in supercapacitors generally include the corrosion of current collectors, leakage, and limitation in handling and ergonomic design, etc .…”

Section: Introductionmentioning

confidence: 99%

“…[7,9] Aqueous, organic, or room temperature ionic liquid (RTIL)-based liquid electrolytes are generally used in supercapacitors, as indicated by numerous reports existing in literature, and every such electrolyte has certain merits and demerits. [9][10][11][12] Demerits of liquid electrolytes in supercapacitors generally include the corrosion of current collectors, leakage, and limitation in handling and ergonomic design, etc. [9][10][11][12][13] Many recent reports indicate the gel polymer electrolytes (GPEs), in which liquid electrolytes are immobilized in suitable polymers, as excellent choice to substitute liquid electrolytes to overcome the various limitations, mentioned above.…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11][12] Demerits of liquid electrolytes in supercapacitors generally include the corrosion of current collectors, leakage, and limitation in handling and ergonomic design, etc. [9][10][11][12][13] Many recent reports indicate the gel polymer electrolytes (GPEs), in which liquid electrolytes are immobilized in suitable polymers, as excellent choice to substitute liquid electrolytes to overcome the various limitations, mentioned above. [12][13][14][15][16][17] However, GPEs also suffer from some limitations including lower mobility and limited accessibility of electrolyte ions in pores of electrodes.…”

Section: Introductionmentioning

confidence: 99%

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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.

show abstract

E = (i \int V dt) / (2 \times m)

. The maximum and effective specific power ( P max and P eff ) have been evaluated by

P_{max} = V^{2} / (8 m \times ESR)

P_{eff} = E / t_{discharge}

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Yadav

Singh

et al. 2019

Energy Tech

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Ionic Liquid Electrolytes for Flexible Supercapacitors

Udaya

Panemangalore

2021

Flexible Supercapacitor Nanoarchitectonics

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Enhanced energy density of quasi‐solid‐state supercapacitor based on activated carbon electrode derived from honeycomb and gel polymer electrolyte with redox‐additive methylene blue

Singh,

Sharma,

Chaurasia

2023

Energy Storage

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Incorporation of redox nature at the electrode‐electrolyte interface is of the current research approach for enhancing the specific capacity as well the energy density of the carbon supercapacitor. In the present studies, symmetric carbon supercapacitor cells are fabricated by using gel polymer electrolytes (GPEs) with and without addition of redox‐additive (MB) and activated carbon (AC) extracted from natural bio‐waste honeycomb (HCAC). The redox‐additive polymeric electrolyte offers high room temperature ionic conductivity (σRT ~ 2.3 × 10−3 S cm−1) and electrochemical stability window of ~1.4 V on the addition of 0.1 g of MB. The HC‐based activated carbon (HCAC) offers high surface area ~ 586 m2 g−1 and dominant meso‐porosity. The performance optimization of the supercapacitor cells are examined by using cyclic voltammetry, charge‐discharge (CD) and electrochemical impedance spectroscopy (EIS) techniques. The supercapacitor with redox‐additive GPE shows the electric double layer features along with faradaic reaction at the electrode‐electrolyte interface, which offers high capacitance ~114 F g−1 and specific energy ~7.76 Wh kg−1 at a power density 0.49 kW kg−1, which is almost ~2.5 times higher than the supercapacitor cell without redox‐additive GPE. Furthermore, the supercapacitor cell with 0.1 g MB redox‐additive based electrolyte shows almost stable capacitance up to 10 000 CD cycles with ~36% initial fading.

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High performance quasi-solid-state supercapacitors with peanut-shell-derived porous carbon

Cited by 108 publications

References 80 publications

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

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

Ionic Liquid Electrolytes for Flexible Supercapacitors

Enhanced energy density of quasi‐solid‐state supercapacitor based on activated carbon electrode derived from honeycomb and gel polymer electrolyte with redox‐additive methylene blue

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