Cauliflower‐shaped ternary nanocomposites with enhanced power and energy density for supercapacitors

Chaudhary, Swati; Kumar, Avshish; Sharma, Nita Dilawar; Gupta, Mukul

doi:10.1002/er.4486

Cited by 27 publications

(22 citation statements)

References 45 publications

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“…[4][5][6][7] Generally, SCs are divided into two categories; one, referred to as electric double-layer capacitors (EDLCs), is based on the accumulation of electrolyte ions near the surface of electrode materials in the form of electrical double layer (EDL), 8,9 and the other one, referred to as pseudocapacitor, involves "reversible" Faradic reaction 10 and is mainly based on either metal oxides [11][12][13] or conductive polymers. [14][15][16][17][18] Recently, there has been great interest in pseudo-capacitors due to their relatively higher Faradic capacitances than EDLCs. 19,20 However, the long-term cycling stability and rate performance of EDLCs is superior to pseudo-capacitors, 21,22 and EDLCs are still competitive candidates for practical applications.…”

Section: Introductionmentioning

confidence: 99%

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

et al. 2019

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Summary In this work, we prepare a series of activated carbons (ACs) from xylose with different combinations of hydrothermal synthesis (HTS) and chemical activation with KOH. The prepared ACs exhibit a variety of morphologies and porous structures, which depend on the conditions used in the hydrothermal synthesis and the chemical activation. The largest surface area (SBET) of the prepared ACs, which is calculated by the Brunauere Emmette Teller (BET) method, is ~3500 m2/g, and the largest volume fraction of mesopores of the prepared ACs is 60%. The correlations between the specific electrochemical properties of the ACs and the structures of the ACs (ie, porous structures and morphologies) are discussed. Spherical ACs exhibit superior rate performance with low impedance. The ACs with three‐dimensional interconnected network of large surface area and porosity possess high specific capacitance. The largest specific capacitance reaches 340 F/g at a current density of 0.5 A/g and 220 F/g at a current density of 50 A/g, which are superior or comparable to those of similar systems. The long‐term capacitance retention is ~86.8% after 10 000 cycles at a current density of 50 A/g. The energy density reaches 48 Wh/kg at a power density of 13.6 kW/kg.

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Section: Introductionmentioning

confidence: 99%

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

et al. 2019

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“…All the specific capacitance values for two and three electrode systems have been given in Table 1. 45 Zhaofen et al has reported a specific capacitance of 160.5 F/g for aniline-grafting graphene oxide/PANI (GO-ANI/PANI) composite. 45 Zhaofen et al has reported a specific capacitance of 160.5 F/g for aniline-grafting graphene oxide/PANI (GO-ANI/PANI) composite.…”

Section: Figurementioning

confidence: 99%

Polyaniline‐Acetylene black‐Copper cobaltite based ternary hybrid material with enhanced electrochemical properties and its use in supercapacitor electrodes

Das

Verma

2019

Int J Energy Res

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A new system based on Polyaniline-Acetylene black-Copper cobaltite composite has been prepared and affirmed by XRD, UV, SEM, FTIR, and EDS characterizations. The rod-like texture of ternary hybrid system offered excellent electrochemical activity in comparison to single and binary systems. CV and CD results revealed outstanding redox behavior of the ternary hybrid electrodes. Ternary electrode (PACC) presented the highest specific capacitance value of 690 F/g at 1 mA/cm 2 current density. PACC electrode based symmetric supercapacitor had a specific capacitance of 137.25 Fg -1 at 1 mA/cm 2 of current density. PACC symmetric supercapacitor had the highest specific power and specific energy of 3308.85 W.kg -1 and 19.064 Wh.kg -1 , respectively. The ternary system provides less charge transfer resistance values compared to all other systems. Thermal stability of the ternary composite is way better than polyaniline, which is due to the contribution of copper cobaltite and acetylene black. The overwhelming characteristics of the ternary hybrid composite bring it to the limelight as an excellent candidate in the field of supercapacitors.

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“…Supercapacitors (SCs) were regarded as one of the most promising energy storage devices because of their superior power density, fast charge/discharge process, and ultralong cycle stability . But the practical applications of SCs were dramatically limited by the low energy density . Currently, battery‐supercapacitor hybrid (BSH) device composed of a capacitive electrode and a battery‐type electrode was used to increase energy density .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of porous flower‐like Ni‐Co‐Mo‐S nanostructures on Ni foam for battery‐supercapacitor hybrid devices

et al. 2020

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The synergistic effects of multiple components and unique nanostructures were contributed to prepare the high‐performance battery‐type electrode materials. In this work, Mo element was introduced to form the ternary transition metal oxides/hydroxides of Ni‐Co to improve conductivity, and then charge transfer was accelerated to enhance the capacity storage. After sulfidation, the electrical conductivity was further improved, and a porous flower‐like nanostructure was formed. Except for that, the composites of transition metal oxides/hydroxides and sulfides were formed via sulfidation. With the help of the synergistic effects of multiple components and a porous flower‐like nanostructure, more Faradic redox reactions occurred. Therefore, the as‐prepared porous flower‐like Ni‐Co‐Mo‐S nanostructures on Ni foam exhibited an excellent areal capacitance of 7.22 C·cm−2 at 5 mA·cm−2 and long‐cycle stability (96.9% retention after 5000 cycles). Furthermore, a coin‐type battery‐supercapacitor hybrid (BSH) device was assembled, which achieved 54.54 Wh·kg−1 at 540 W·kg−1 and displayed 74.8% capacitance retention after 3500 cycles. All mentioned above demonstrated that ternary transition metal oxides/hydroxides precursors via sulfidation can form special structures and the composites of transition metal oxides/hydroxides and sulfides to prepare high‐performance battery‐type electrodes for energy storage.

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Cauliflower‐shaped ternary nanocomposites with enhanced power and energy density for supercapacitors

Cited by 27 publications

References 45 publications

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

Polyaniline‐Acetylene black‐Copper cobaltite based ternary hybrid material with enhanced electrochemical properties and its use in supercapacitor electrodes

Synthesis of porous flower‐like Ni‐Co‐Mo‐S nanostructures on Ni foam for battery‐supercapacitor hybrid devices

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