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Method for growing helical carbon nanotubes on wood-derived porous carbon

A carbon nanotube and helical technology, applied in the field of supercapacitors, can solve the problems of unsatisfactory electrical conductivity and mechanical properties of carbonized wood, and limit applications, and achieve the effects of facilitating transmission, reducing production costs, and improving mechanical properties

Active Publication Date: 2019-08-20
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although carbonized wood as a substrate has promising application prospects in supercapacitors and lithium-sulfur batteries, the electrical conductivity and mechanical properties of carbonized wood are not satisfactory, which limits its further application.

Method used

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  • Method for growing helical carbon nanotubes on wood-derived porous carbon
  • Method for growing helical carbon nanotubes on wood-derived porous carbon
  • Method for growing helical carbon nanotubes on wood-derived porous carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Clean the wood with ethanol and deionized water to remove impurities and residual organic matter on the surface of the wood and pipes. Dry the cleaned wood in an oven at 80°C for 24 hours, and then heat it to 900°C in a nitrogen atmosphere at a constant temperature 3. The carbonization treatment was carried out within hours, after cooling to room temperature, the sample was ultrasonically cleaned with ethanol and deionized water 3 times, and then the sample was placed in an oven at 60° C. and dried for 6 hours to obtain carbonized wood (CW).

[0029] 2. Immerse the CW obtained in step 1 in 0.05mol / L Fe(NO 3 ) 3 In the aqueous solution, reflux at 80°C for 12 hours. After the reaction is completed and the reaction temperature drops to room temperature, the sample is placed in an oven at 60°C and dried for 6 hours to obtain an impregnated Fe(NO 3 ) 3 CW.

[0030] 3. Immerse the Fe(NO 3 ) 3 The CW is heated to 800°C in a nitrogen atmosphere and kept at a constant temperature f...

Embodiment 2

[0035] 1. This step is the same as step 1 of Example 1.

[0036] 2. In this step, Fe(NO 3 ) 3 The concentration is 0.5mol / L, the other steps are the same as the step 2 of Example 1, and the result is impregnated with Fe(NO 3 ) 3 CW.

[0037] 3. Immerse the Fe(NO 3 ) 3 The CW was heated to 800°C in a nitrogen atmosphere and kept at a constant temperature for 60 minutes. After the heat preservation is over, acetonitrile gas was quickly introduced and kept at 800°C for 30 minutes to obtain a CW / CNTs composite material.

[0038] 4. Immerse the CW / CNTs composite material obtained in step 3 in a mixed acid solution, and soak in a vacuum environment at room temperature for 4 hours. The other steps are the same as step 4 of Example 1, to obtain a CW / HCNTs composite material (see Image 6 ).

Embodiment 3

[0040] 1. This step is the same as step 1 of Example 1.

[0041] 2. In this step, Fe(NO 3 ) 3 The concentration is 1mol / L, the other steps are the same as the step 2 of Example 1, and the result is impregnated with Fe(NO 3 ) 3 CW.

[0042] 3. Immerse the Fe(NO 3 ) 3 The CW was heated to 800°C in a nitrogen atmosphere and kept at a constant temperature for 30 minutes. After the heat preservation is over, acetonitrile gas was quickly introduced and kept at 800°C for 60 minutes to obtain a CW / CNTs composite.

[0043] 4. Immerse the CW / CNTs composite material obtained in step 3 in a mixed acid solution, and soak in a vacuum environment at room temperature for 2 hours. The other steps are the same as step 4 of Example 1, to obtain a CW / HCNTs composite material (see Figure 7 ).

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Abstract

The invention discloses a method for growing a spiral carbon nanotube on porous carbon derived from timber. The method is characterized in that the carbon nanotube is subjected to chemical vapor deposition on the carbonized wood, space constraint effect of a natural vertical tube of the carbonized wood and the shearing contraction effect of the mixed acid on the carbon nanotube are used, and the spiral carbon nanotube with a uniform morphology height is prepared at the carbonized wood. The spiral carbon nanotube can increase the conductivity of the carbonized wood, and obviously increases themechanical property of a composite material. The composite material can be used as a super capacitor electrode, the natural vertical tube can provide an enough space for introducing other nano-materials, and a composite electrode does not require addition of a binder and a conductive agent. The elastic interleaving network of the spiral carbon nanotube is in favor of transmission of electrolyte ions, and an application of the composite material in the field of energy storage can be widened. The method has the advantages of simple technology, short production period and easy control, and can realize macro-preparation of the spiral carbon nanotube.

Description

Technical field [0001] The invention belongs to the technical field of supercapacitors, and particularly relates to a method for growing spiral carbon nanotubes on porous carbon derived from wood. Background technique [0002] Carbon nanotubes (CNTs) are tubular structures formed by curling graphite layers. They have excellent electromagnetic, mechanical and thermal properties and are widely used in energy storage fields such as supercapacitors. Compared with one-dimensional CNTs, three-dimensional helical carbon nanotubes (HCNTs) can not only be used as a chiral material, but also generate an induced electric field when current passes through a single helical carbon nanotube, so it can be used for Energy converters, nano switches and other fields. In addition, traditional CNTs are easy to stack, and the elastic interweaving network structure between helical carbon nanotubes is more conducive to mass transfer, and it can also increase the loading of electrode materials, thereby ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05C01B32/162H01G11/36H01G11/32H01G11/86
Inventor 雷志斌辛福恩
Owner SHAANXI NORMAL UNIV
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