Electrospun NiO nanofibers as cathode materials for high performance asymmetric supercapacitors

Kolathodi, Muhamed Shareef; Palei, Milan; Natarajan, T. S.

doi:10.1039/c4ta07075e

Cited by 155 publications

(96 citation statements)

References 42 publications

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“…Tremendous effort is being focused on developing storage devices, in particular, supercapacitors owing to their high power density, fast charge–discharge, longer cycle life, and stability 6. Despite these efforts, the energy density is still lower than that of batteries; this is dependent on the potential window, which is influenced by the electrolyte 7. Aqueous electrolytes usually offer lower potential windows (< 1 V), and, thus, organic electrolytes, including ionic liquid (ILs), are being explored with great interest owing to their excellent properties such as higher ionic conductivity, moderate viscosity, non‐flammability, lower toxicity, low volatility, good thermal stability, and safety 8,9.…”

Section: Introductionmentioning

confidence: 99%

Improved Electrochemical Performance of a ZnFe₂O₄ Nanoflake‐Based Supercapacitor Electrode by Using Thiocyanate‐Functionalized Ionic Liquid Electrolytes

et al. 2015

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Thiocyanate-functionalized ionic liquids (ILs) 1-butyl-3-methylimidazolium thiocyanate [BMIM][SCN], 1-ethyl-3-methylimidazolium thiocyanate [EMIM][SCN], and 3-methylimidazolium thiocyanate [MIM][SCN], with varying chain lengths, were synthesized by using metathesis followed by ion exchange under reflux conditions. These ILs were investigated for their application as electrolyte with a ZnFe 2 O 4 nanoflake-based supercapacitor electrode; they exhibited significantly better performance than any other previously reported ILs used as electrolytes. [BMIM][SCN] showed higher specific capacitance (781 F g -1 ), cycle stability (95 %

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Section: Introductionmentioning

confidence: 99%

Improved Electrochemical Performance of a ZnFe₂O₄ Nanoflake‐Based Supercapacitor Electrode by Using Thiocyanate‐Functionalized Ionic Liquid Electrolytes

et al. 2015

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“…The last part of the circuit is diffusive resistance (Warburg impedance), which is represented by the straight line at the low frequency. Figure (f) displays that the slope of the line is almost 60 o , which is an obvious feature of an ideal capacitive behavior …”

Section: Resultsmentioning

confidence: 89%

Self‐Templated Synthesis of Cuprous Oxide Nanofiber‐Assembled Hollow Spheres for High‐Performance Electrochemical Energy Storage

Wang

Miao

et al. 2018

ChemElectroChem

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Hollow structures are considered as promising electrode materials. Their enhanced surface‐to‐volume ratio results in an increased contact area between the electrolyte and electrode and, thereby, a higher accessibility of active material. Here, a facile hydrothermal method is applied to synthesize hollow Cu2O spheres, assembled by well‐aligned nanofibers. Based on the investigation of the samples at different reaction times, a growing mechanism is proposed. Nano building‐blocks create porous channels within the shell, which could facilitate the transfer and shorten the transportation pathway for both ions and charge. The Cu2O with its unique structure displays a high specific capacitance of 1075 F g−1 at a current density of 5 mA cm−2, a remarkable rate capability of 82 %, and an excellent cycling property of nearly 100 % of the initial value remaining after 5000 charge‐discharge cycles. Moreover, the hollow Cu2O spheres are first used for the preparation of a positive electrode in an asymmetric supercapacitor, using carbon as a negative electrode. The device exhibits a high energy density of 44.7 Wh kg−1 at a power density of 420.2 W kg−1, and when the power density reaches values as high as 4201.7 W kg−1, an energy density of 16 Wh kg−1 is still attained.

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“…These results suggest that both the materials exhibit capacitive property which originates mostly from the pseuducapacitor (0.05 V to 0.4 V) but participation of electrical double layer is also there (from the CV curve -01 V to 0.05 V). 3,39 Two-electrode system: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 Scheme 2: Schematic presentation of the mechanism of action of the HNS CoSn(OH) 6 //AC when it was used as the two-electrode system.…”

Section: Electrochemical Behaviourmentioning

confidence: 98%

Suitable Morphology Makes CoSn(OH)₆ Nanostructure a Superior Electrochemical Pseudocapacitor

Sahoo

Sasmal

Ray

et al. 2016

ACS Appl. Mater. Interfaces

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Morphology of a material with different facet, edge, kink, etc. generally influences the rate of a catalytic reaction. 1,2 Herein, we account for the importance of altered morphology of a nanomaterial for a supercapacitor device and employed CoSn(OH) 6 as an electrode material.Suitable fabrication of a stable aqueous asymmetric supercapacitor (AAS) using metal hydroxide as positive electrode can be beneficial if the high energy density is derived without sacrificing the power density. Here we have synthesized an uncommon hierarchical mesoporous nanostructured (HNS) CoSn(OH) 6 to fabricate a pseudocapacitor. In this endeavour NH 3 is found to be a well suited hydrolyzing agent for the synthesis. 3 Serendipitously, HNS was transformed into favored cubic nanostructure (CNS) in NaOH solution. In solution, NaOH acts as a structure directing as well as an etching agent. Both the samples (HNS & CNS) were used as pseudocapacitor electrodes in KOH electrolyte independently, which is reported for the first time. The HNS exhibits very high specific capacitance value (2545 F/g at 2.5 A/g specific current) with better cyclic durability over CNS sample (851 F/g at 2.5 A/g specific current). To examine the real cell application, HNS sample was used as the positive electrode material with the activated carbon (AC) as the negative electrode material for the development of an aqueous asymmetric supercapacitor (AAS). The as-fabricated AAS exhibited very high specific capacitance value of 713 F/g at a specific current of 1.5 A/g and retained 92% specific capacitance value even after 10000 charge-discharge cycles. A maximum energy density of 63.5 Wh kg -1 and a maximum power density of 5277 W kg -1 were ascertained from the as-fabricated AAS, HNS CoSn(OH) 6 //AC.

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Electrospun NiO nanofibers as cathode materials for high performance asymmetric supercapacitors

Abstract: Highly granulated NiO nanofibers were prepared by electrospinning and their electrochemical properties as cathode materials were investigated for asymmetrical supercapacitors.

Cited by 155 publications

References 42 publications

Improved Electrochemical Performance of a ZnFe₂O₄ Nanoflake‐Based Supercapacitor Electrode by Using Thiocyanate‐Functionalized Ionic Liquid Electrolytes

Improved Electrochemical Performance of a ZnFe₂O₄ Nanoflake‐Based Supercapacitor Electrode by Using Thiocyanate‐Functionalized Ionic Liquid Electrolytes

Self‐Templated Synthesis of Cuprous Oxide Nanofiber‐Assembled Hollow Spheres for High‐Performance Electrochemical Energy Storage

Suitable Morphology Makes CoSn(OH)₆ Nanostructure a Superior Electrochemical Pseudocapacitor

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Electrospun NiO nanofibers as cathode materials for high performance asymmetric supercapacitors

Abstract: Highly granulated NiO nanofibers were prepared by electrospinning and their electrochemical properties as cathode materials were investigated for asymmetrical supercapacitors.

Cited by 155 publications

References 42 publications

Improved Electrochemical Performance of a ZnFe2O4 Nanoflake‐Based Supercapacitor Electrode by Using Thiocyanate‐Functionalized Ionic Liquid Electrolytes

Improved Electrochemical Performance of a ZnFe2O4 Nanoflake‐Based Supercapacitor Electrode by Using Thiocyanate‐Functionalized Ionic Liquid Electrolytes

Self‐Templated Synthesis of Cuprous Oxide Nanofiber‐Assembled Hollow Spheres for High‐Performance Electrochemical Energy Storage

Suitable Morphology Makes CoSn(OH)6 Nanostructure a Superior Electrochemical Pseudocapacitor

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Improved Electrochemical Performance of a ZnFe₂O₄ Nanoflake‐Based Supercapacitor Electrode by Using Thiocyanate‐Functionalized Ionic Liquid Electrolytes

Improved Electrochemical Performance of a ZnFe₂O₄ Nanoflake‐Based Supercapacitor Electrode by Using Thiocyanate‐Functionalized Ionic Liquid Electrolytes

Suitable Morphology Makes CoSn(OH)₆ Nanostructure a Superior Electrochemical Pseudocapacitor