Novel Technique for Producing Porous Carbon Nanofiber Mate for Supercapacitors Application

El-Shafei, M. Hussein; Ghoniem, Engy; Hassanin, Ahmed H.; El‐Moneim, Ahmed Abd

doi:10.4028/www.scientific.net/kem.735.199

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…The electrospun P, PC and PPC nanofiber mats were first dried in a vacuum furnace at 50 °C for 12 h. Then, the dried samples were subjected to oxidative stabilization and carbonization processes sequentially in a tubular quartz reactor as follows; oxidative annealing (stabilization) in air at 280 °C (heating rate of 1.0 °C min −1 ) for 3.0 h [38,39]. Then, carbonization at 1100 °C (heating rate of 4 °C min −1 ) for 1.0 h in Ar flow to avoid oxidation and eliminate pyrolysis products, such as N 2 , CO 2 , and H 2 O [31,32].…”

Section: Pyrolysis Of Electrospun Matsmentioning

confidence: 99%

Free-standing interconnected carbon nanofiber electrodes: new structural designs for supercapacitor application

et al. 2020

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This work aims to develop and characterize a new design of free-standing interconnected carbon nanofiber electrodes for supercapacitor application. The fibers are obtained via carbonization of three components of electrospun nanofiber mats based on a polyacrylonitrile polymer (as a carbon backbone precursor), polyvinylalcohol (as a sacrificial copolymer), and 0-1.0 wt% multi-walled carbon nanotubes. Carbonizing these ternary composites results in fibers with about twice as large in surface area and one order of magnitude higher in electrical conductivity than those obtained by the carbonization of neat polyacrylonitrile and/or binary polyacrylonitrile-0-1.0 wt% carbon nanotube mats. The carbonized polyacrylonitrile-polyvinylalcohol-0.3 wt% carbon nanotube mat reveals the highest surface area and electrical conductivity and best capacitive performance. It exhibits energy and power densities of 27.8 Wh kg −1 and 110.59 kW kg −1 , respectively, and cyclic stability of 95% after 2000 charge-discharge cycles at a charging current of 1.0 Ag −1 . The nanotubes' alignment along the fiber's axis, the formation of fiber-fiber interconnected morphology with more mesopore pollution, and changes in the graphitization degree and defect features of fiber crystallites are the reasons for the observed increase in the electrical conductivity, surface area, and capacitive performance of the carbon fibers. Therefore, the new design represents a potential free-standing carbon nanofiber electrode for future electrochemical double layer capacitor (EDLC) device fabrication.

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Section: Pyrolysis Of Electrospun Matsmentioning

confidence: 99%

Free-standing interconnected carbon nanofiber electrodes: new structural designs for supercapacitor application

et al. 2020

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“…Many carbon nanostructures in the form of stand-alone and on flexible substrates such as carbon nanotubes (CNTs) [6,7], graphene [8,9], mesoporous carbon [10], and carbon nanofibers (CNFs) [11] have been explored for a long time. Although carbon allotropes are chemically stable and non-toxic materials, however, and due to its intrinsic electric double layer (EDL) storing mechanism the devices are usually suffered from low specific capacitances (commonly lower than 400 F g-1 ) and poor power density [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Controlled-synthesis of hierarchical NiCo2O4 anchored on carbon nanofibers mat for free-standing and highly-performance supercapacitors

El-Shafei

El‐Deen

El‐Moneim

et al. 2021

J Mater Sci: Mater Electron

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In this work, a versatile one-step hydrothermal technique was used to produce a hybrid standalone electrode of NiCo2O4 hierarchical nanostructures anchored on CNFs mat for highly-performance and substrate-free supercapacitors. The CNFs mat was working as a conductive and a three-dimensional template for hierarchical NiCo2O4 nanostructures deposition at the same time. The morphological and structural data analysis revealed a pure spinel NiCo2O4 nanostructures with a unique surface morphology comprising interconnected ultrathin nanoneedles and nanoflowers were successfully anchored to the CNFs mat. Real supercapacitors consist of two-symmetrical hybrid electrodes with different NiCo2O4 loading ratios were assembled and tested. The electrochemical performances of the assembled devices in terms of specific capacitance, energy, and power densities were systematically evaluated. Increasing the NiCo2O4 loading on the CNFs mat had shown a positive impact on improving the overall electrochemical performance of the assembled supercapacitors. A hybrid electrode loaded with NiCo2O4 twice as much as CNFs possess a specific capacitance value of 540 F g −1 along with an energy density of 30 Wh kg −1 at a power density of 515.6 W kg −1 . In addition, the device showed excellent cycling stability and high capacitance retention against 6000 charge-discharge cycles at a charging current of 1.0 A g −1 .

show abstract

Section: Introductionmentioning

confidence: 99%

Controlled-Synthesis of Hierarchical NiCo2O4 Anchored on Carbon Nanofibers Mat for Free-Standing and Highly-Performance Supercapacitors

El-Shafei

El‐Deen

El‐Moneim

et al. 2021

Preprint

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In this work, a versatile one-step hydrothermal technique was used to produce a hybrid standalone electrode of NiCo2O4 hierarchical nanostructures anchored on CNFs mat for highly-performance and substrate-free supercapacitors. The CNFs mat was working as a conductive and a three-dimensional template for hierarchical NiCo2O4 nanostructures deposition at the same time. The morphological and structural data analysis revealed a pure spinel NiCo2O4 nanostructures with a unique surface morphology comprising interconnected ultrathin nanoneedles and nanoflowers were successfully anchored to the CNFs mat. Real supercapacitors consist of two-symmetrical hybrid electrodes with different NiCo2O4 loading ratios were assembled and tested. The electrochemical performances of the assembled devices in terms of specific capacitance, energy, and power densities were systematically evaluated. Increasing the NiCo2O4 loading on the CNFs mat had shown a positive impact on improving the overall electrochemical performance of the assembled supercapacitors. A hybrid electrode loaded with NiCo2O4 twice as much as CNFs possess a specific capacitance value of 540 F g−1 along with an energy density of 30 Wh kg−1 at a power density of 515.6 W kg−1. In addition, the device showed excellent cycling stability and high capacitance retention against 6000 charge-discharge cycles at a charging current of 1.0 A g−1.

show abstract

Novel Technique for Producing Porous Carbon Nanofiber Mate for Supercapacitors Application

Cited by 3 publications

References 17 publications

Free-standing interconnected carbon nanofiber electrodes: new structural designs for supercapacitor application

Free-standing interconnected carbon nanofiber electrodes: new structural designs for supercapacitor application

Controlled-synthesis of hierarchical NiCo2O4 anchored on carbon nanofibers mat for free-standing and highly-performance supercapacitors

Controlled-Synthesis of Hierarchical NiCo2O4 Anchored on Carbon Nanofibers Mat for Free-Standing and Highly-Performance Supercapacitors

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