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Preparation method for ferric oxide/carbon nanotube composite electrode material based on microwave irradiation

A carbon nanotube composite and carbon nanotube technology, applied in the direction of hybrid capacitor electrodes, can solve the problems of environmental pollution, high cost, and long time required, and achieve the effects of reducing pollution, improving capacitance performance, and uniform heating

Inactive Publication Date: 2018-04-13
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the existing preparation method not only pollutes the environment, has high cost, but also takes a long time

Method used

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  • Preparation method for ferric oxide/carbon nanotube composite electrode material based on microwave irradiation
  • Preparation method for ferric oxide/carbon nanotube composite electrode material based on microwave irradiation
  • Preparation method for ferric oxide/carbon nanotube composite electrode material based on microwave irradiation

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Experimental program
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Effect test

Embodiment 1

[0026] Weigh 0.1g multi-walled carbon nanotubes, 0.695g FeSO 4 •7H 2 O, placed in 5mL deionized water, ultrasonically dispersed for 10min. Add 20mL of 30% hydrogen peroxide at a dropping rate of 2mL / min, stir evenly, and reflux for 20min under microwave irradiation with a power of 500W. After cooling, wash with deionized water and filter. The filtrate was ultrasonically dispersed in 10 mL of deionized water again, and freeze-dried for 20 h to obtain a composite electrode material precursor. Under the protection of nitrogen, the composite electrode material precursor was annealed at 500° C. for 2 hours to obtain the iron oxide / carbon nanotube composite electrode material.

[0027] figure 1 is the XRD pattern of the composite material prepared above. Near 26° in the figure is the (002) characteristic peak of carbon nanotubes, and the remaining characteristic peaks are related to Fe 2 o 3 The PDF standard card corresponds to JCPDS: 33-00664.

[0028] figure 2 The SEM im...

Embodiment 2

[0031] Weigh 0.15g of multi-walled carbon nanotubes, 0.556g of FeSO 4 •7H 2 O, placed in 5mL deionized water, ultrasonically dispersed for 15min. Add 25mL of 30% hydrogen peroxide at a dropping rate of 4mL / min, stir evenly, and reflux for 15min under microwave irradiation with a power of 400W. After cooling, wash with deionized water and filter. The filtrate was ultrasonically dispersed in 10 mL of deionized water again, and freeze-dried for 18 h to obtain a composite electrode material precursor. Under nitrogen protection, the composite electrode material precursor was annealed at 450° C. for 2 hours to obtain an iron oxide / carbon nanotube composite electrode material.

[0032] Figure 4 The middle curve b is the charge-discharge cycle curve of the electrode composite material prepared in this embodiment. In a symmetrical supercapacitor, with 1mol / L Na 2 SO 4 It is an electrolyte solution, the voltage window is 0-1V, and the charge and discharge current density is 1A / g...

Embodiment 3

[0034] Weigh 0.05g multi-walled carbon nanotubes, 0.695g FeSO 4 •7H 2 O, placed in 5mL deionized water, ultrasonically dispersed for 10min. Add 20mL of 30% hydrogen peroxide at a rate of 2mL / min, stir evenly, and reflux for 10min under microwave irradiation with a power of 700W. After cooling, wash with deionized water and filter. The filtrate was ultrasonically dispersed in 10 mL of deionized water again, and freeze-dried for 22 h to obtain a composite electrode material precursor. Under nitrogen protection, the composite electrode material precursor was annealed at 400° C. for 3 hours to obtain an iron oxide / carbon nanotube composite electrode material.

[0035] In a symmetrical supercapacitor, with 1mol / L Na 2 SO 4 It is an electrolyte solution, the voltage window is 0-1V, and the charge and discharge current density is 1A / g. After 1000 cycles, the capacitor capacity remains at 84F / g.

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Abstract

The invention discloses a preparation method for a ferric oxide / carbon nanotube composite electrode material based on microwave irradiation. Carbon nanotubes are ultrasonically dispersed into aqueoussolution of ferrous sulfate; excessive hydrogen peroxide is added drop by drop; reflux reaction is carried out under the microwave irradiation, thereby preparing a ferric oxide / carbon nanotube composite electrode material precursor; and the precursor is annealed under an inert atmosphere, thereby obtaining the ferric oxide / carbon nanotube composite electrode material. The preparation method provided by the invention is simple, rapid and environmentally friendly and is low in cost. The prepared composite electrode material has relatively high specific capacitance and rate performance.

Description

technical field [0001] The invention belongs to the technical field of supercapacitor electrode material preparation, in particular to a method for preparing an iron oxide / carbon nanotube composite electrode material. Background technique [0002] As an efficient energy storage system, supercapacitors have the advantages of long cycle life, high efficiency, and no memory effect, and are widely used in many fields such as portable electronic devices and new energy vehicles. However, the energy density of existing supercapacitors is generally low, which restricts its further development. [0003] Carbon nanotubes, a type of carbon material with a unique one-dimensional structure, are potential electrode materials for supercapacitors due to their excellent mechanical stability and electrical conductivity. However, the energy storage mechanism determines its theoretical specific capacitance is low. [0004] At present, researchers increase the specific capacitance of electrode...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/36H01G11/46
CPCY02E60/13H01G11/30H01G11/36H01G11/46
Inventor 米杰张帅国岳鲁超武蒙蒙赵翰庆李忠
Owner TAIYUAN UNIV OF TECH
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