Method for preparing graphene/carbon nanotube/carbon nanofiber membrane ternary composite capacitive demineralization electrode

A technology of carbon nanofibers and carbon nanotubes, which is applied in the field of electricity, can solve the problems of poor desalination effect of capacitor desalination electrode materials, and achieve the effects of significant technological progress, good conductivity, and simple methods

Inactive Publication Date: 2017-08-08
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Application Information

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Problems solved by technology

[0005] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a preparation method of a graphene/carbon nanotube/carbon nanofiber membrane ternary composite capacitive desalination electrode, the graphene/car

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  • Method for preparing graphene/carbon nanotube/carbon nanofiber membrane ternary composite capacitive demineralization electrode
  • Method for preparing graphene/carbon nanotube/carbon nanofiber membrane ternary composite capacitive demineralization electrode
  • Method for preparing graphene/carbon nanotube/carbon nanofiber membrane ternary composite capacitive demineralization electrode

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Embodiment 1

[0024] 1 g of polyacrylonitrile was dissolved in 9 g of N,N-dimethylformamide solution to prepare a 10 wt% polyacrylonitrile solution. Add 50 mg of graphene oxide and purified carbon nanotubes (2.5 mg) to the polyacrylonitrile solution, the mass ratio of graphene oxide to carbon nanotubes is 1:0.05, and mix well by ultrasonic. The solution was continuously stirred at 60° C. for 6-8 hours to obtain a graphene oxide / carbon nanotube / polyacrylonitrile dope. Using the electrospinning technique, put the graphene oxide / carbon nanotube / polyacrylonitrile dope into the syringe. Then, with a syringe pump at 18kV at 1.0mL h -1 Electrospinning was performed at a constant flow rate. Collect the electrospun fibers on grounded aluminum foil. Wherein, the distance between the grounded aluminum foil collecting plate and the needle is 15 cm. The collected fiber papers were then vacuum-dried overnight and stabilized at 250 °C for 2 h in air at a heating rate of 1 °C / min to obtain preoxidized ...

Embodiment 2

[0026] 1 g of polyacrylonitrile was dissolved in 9 g of N,N-dimethylformamide solution to prepare a 10 wt% polyacrylonitrile solution. Add 50 mg of graphene oxide and purified carbon nanotubes (5 mg) to the polyacrylonitrile solution, the mass ratio of graphene oxide to carbon nanotubes is 1:0.1, and mix evenly by ultrasonic. The solution was continuously stirred at 60° C. for a certain period of time to obtain a graphene oxide / carbon nanotube / polyacrylonitrile dope. Using the electrospinning technique, put the graphene oxide / carbon nanotube / polyacrylonitrile dope into the syringe. Then, with a syringe pump at 18kV at 1.0mL h -1Electrospinning was performed at a constant flow rate. Collect the electrospun fibers on grounded aluminum foil. Wherein, the distance between the grounded aluminum foil collecting plate and the needle is 15 cm. The collected fiber papers were then vacuum-dried overnight and stabilized at 250 °C for 2 h in air at a heating rate of 1 °C / min to obtain...

Embodiment 3

[0028] 1 g of polyacrylonitrile was dissolved in 9 g of N,N-dimethylformamide solution to prepare a 10 wt% polyacrylonitrile solution. Graphene oxide and purified carbon nanotubes were added to the polyacrylonitrile solution, the mass ratio of graphene oxide to carbon nanotubes was 1:0.15, and ultrasonically mixed evenly. The solution was continuously stirred at 60° C. for a certain period of time to obtain a graphene oxide / carbon nanotube / polyacrylonitrile dope. Using the electrospinning technique, put the graphene oxide / carbon nanotube / polyacrylonitrile dope into the syringe. Then, with a syringe pump at 18kV at 1.0mL h -1 Electrospinning was performed at a constant flow rate. Collect the electrospun fibers on grounded aluminum foil. Wherein, the distance between the grounded aluminum foil collecting plate and the needle is 15 cm. The collected fiber papers were then vacuum-dried overnight and stabilized at 250 °C for 2 h in air at a heating rate of 1 °C / min to obtain pr...

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Abstract

The invention provides a method for preparing a graphene/carbon nanotube/carbon nanofiber membrane ternary composite capacitive demineralization electrode. The method comprises the steps of adding polyacrylonitrile into a well-dispersed graphene oxide and carbon nanotube N,N-dimethylformamide solution, carrying out stirring at a certain temperature so as to prepare a spinning solution, then, preparing a composite film by using an electrostatic spinning technology, and carrying out high-temperature annealing and carbon dioxide activating, so as to obtain a graphene/carbon nanotube/carbon nanofiber membrane ternary composite film. The film obtained by the method can be directly used as the capacitive demineralization electrode. The method provided by the invention is simple, a binder is not required, the prepared electrode material has a flexible characteristic, the assembly is facilitated, and the requirements on environment-friendliness are met; the prepared ternary composite material has a unique microstructure and good electric conductivity, the demineralization performance can be effectively improved, and thus, the ternary composite material has a potential development prospect.

Description

technical field [0001] The invention belongs to the field of electricity, and relates to a capacitive desalination electrode, in particular to a method for preparing a graphene / carbon nanotube / carbon nanofiber membrane ternary composite capacitive desalination electrode. Background technique [0002] In recent years, water crisis has become a global problem due to environmental pollution and population growth. Traditional desalination of seawater and brackish water includes multi-stage flash evaporation, electrodialysis, ion exchange, and reverse osmosis technologies. However, conventional desalination technologies are limited by excessive energy consumption, secondary pollution, low environmental friendliness, and difficult maintenance. In this context, capacitive desalination has attracted more and more attention from industries and scientific departments due to its advantages of renewability, low cost, and environmental friendliness. [0003] Capacitive desalination t...

Claims

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Application Information

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IPC IPC(8): C02F1/469C02F103/08
CPCC02F1/4691C02F2103/08C02F2201/46
Inventor 张大全罗国铭王意珍章振华
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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