Coal based activated carbon nanofibers prepared by electrospinning

Zhao, Hongyang; Wang, Luxiang; Jia, Dianzeng; Xia, Wei; Li, Jun; Guo, Zaiping

doi:10.1039/c4ta00069b

Cited by 128 publications

(58 citation statements)

References 26 publications

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“…Commonly, surface activation methods include chemical activation, physical activation, and microwave radiation activation and so on. [26][27][28][29][30] The research group used KOH activation method to prepare biomass-based carbon nanobers with large specic surface area, and its electrochemical performance improved greatly. Although the KOH activation method can increase the specic surface area of the bers, the amount of hetero atom functional groups on the surface of the bers is largely reduced due to the strong corrosiveness of KOH.…”

Section: Introductionmentioning

confidence: 99%

Preparation and electrochemical studies of electrospun phosphorus doped porous carbon nanofibers

et al. 2019

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An ultra-facile fabrication process for the preparation of phosphorus doped porous carbon nanofibers (P-PCNFs) through the electrospinning and heat treatment method has been studied. The materials were characterized by X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy. Studies showed that fabricated P-PCNFs have unique porous fibers structures, large specific surface area (462.83 cm 2 g À1 ), and abundant microporous and mesoporous structures. X-ray photoelectron spectroscopy analyses revealed that the contents of phosphorus and electrochemical properties in a series of P-PCNF samples can be tuned by controlling the polyphosphoric acid concentration. The electrochemical properties of the materials were evaluated using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. Studies showed that the specific capacitance of the fabricated P-PCNFs using the ultra-facile process reached up to 228.7 F g À1 at 0.5 A g À1 in 1 M H 2 SO 4 . Over 84.37% of the initial capacitance remains as the current density increases from 0.5 to 10 A g À1 . Meanwhile, at a current density of 2 A g À1 , no capacitance loss was observed in 5000 charge/discharge cycles. The highest voltage windows of sample P-PCNFs-1.0 in 1 M H 2 SO 4 aqueous electrolyte can reach 1.4 V. These properties suggest that the fabricated P-PCNFs exhibit excellent electrochemical properties. Conclusively, the surface of carbon nanofibers can be modified by heteroatom doping or surface activation which can improve the electrochemical performance of the materials.

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Section: Introductionmentioning

confidence: 99%

Preparation and electrochemical studies of electrospun phosphorus doped porous carbon nanofibers

et al. 2019

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“…The electrochemical properties of PANI/PVA hydrogel electrodes showed high specific capacitance of 240 F g −1 at current density of 1 A g −1 . Zhao et al [37] prepared coal based active carbon nanofiber to apply as binder-free electrode which showed a specific capacitance of 230 F g −1 at a current density of 1 A g −1 . To our knowledge, there is no report respected to HACF as a self-supported electrode.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Electrochemical Performance of Hollow Activated Carbon Fiber Self-Supported Electrode for Supercapacitor

Jiao

Cardon

et al. 2020

j nanosci nanotechnol

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Hollow activated carbon fiber (HACF) with high specific surface area and high charge storage capability was prepared by pre-oxidation, carbonization and KOH-activation from polyacrylonitrile (PAN). HACF was used as self-supported working electrode directly without any binder and conductive agent. The effect of the activation time on specific surface area of HACF was studied intensively. The results show that the specific surface area of HACF increased with the increase of activation time from 0.5 h to 1.5 h, and then decreased with further increase of activation time. Highest specific surface area of 1873 m 2 g −1 and micropore volume of 0.61 cm 3 g −1 were obtained in HACF activated for 1.5 h. Electrochemical properties of HACF can be improved with increase of activation time, but excessive activation results in the decrease of specific surface area and increase of internal resistance of HACF. The self-supported electrode of HACF possesses a large specific capacitance of 323 F g −1 at 0.05 A g −1 and 216 F g −1 at 1 A g −1 . Therefore, HACF can be a promising self-supported electrode for high performance supercapacitors.

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“…The porosity in HPDC products could be assumed from the gas entrapment phenomenon using finite element analysis (FEA) [9]- [12]. Porosity could be reduced by optimization shapes of runner, gating systems or process parameters [13]- [15].…”

Section: Introductionmentioning

confidence: 99%

Evaluate of Chill Vent Performance for High Pressure Die-Casting Production and Simulation of Motorcycle Fuel Caps

Meethum

Suvanjumrat

2017

MATEC Web Conf.

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Abstract. Inappropriate air vent design always induced porosities in thin and complex shape of high pressure diecasting (HPDC) products. Chill block installation was preferred to improve permanent molds for reducing porosities. There were not regular to obtain an appropriated chill vent from this method unless an experience of mold makers. This research was performed to investigate and evaluate the chill block performance in the HPDC mold of motorcycle fuel caps. The HPDC mold of the thin and complex shape product without chill vents was improved by inserting of chill blocks. The motorcycle fuel caps of molds with and without chill vents were compared to verify size and position of porosity defects. Furthermore the HPDC simulation using the finite element analysis (FEA) had been performed according to the physical experiment. The FEA results were compared and in agreement with the experimental data. Therefore an improvement of the HPDC mold should be used FEA to obtain the best way of the air vent design.

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Coal based activated carbon nanofibers prepared by electrospinning

Abstract: Porous carbon nanofibers were prepared by electrospinning using coal as the raw material. The activated carbon fiber mat is a promising candidate for the electrode of supercapacitors.

Cited by 128 publications

References 26 publications

Preparation and electrochemical studies of electrospun phosphorus doped porous carbon nanofibers

Preparation and electrochemical studies of electrospun phosphorus doped porous carbon nanofibers

Preparation and Electrochemical Performance of Hollow Activated Carbon Fiber Self-Supported Electrode for Supercapacitor

Evaluate of Chill Vent Performance for High Pressure Die-Casting Production and Simulation of Motorcycle Fuel Caps

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