Electrochemical modification treatment method of carbon nanotubes

A carbon nanotube and processing method technology, applied in chemical instruments and methods, inorganic pigment processing, fibrous fillers, etc., can solve problems such as reducing the catalytic activity of carbon tubes, and achieve good electron transfer rate, good hydrophilicity, and operation. simple effect

Inactive Publication Date: 2012-02-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the adsorption and aggregation of organic molecules on the outer wall of the carbon tube will inevitably lead to the covering of the active center on the surface of the carbon tube, thereby reducing the catalytic activity of the carbon tube and the electron transfer rate.

Method used

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  • Electrochemical modification treatment method of carbon nanotubes
  • Electrochemical modification treatment method of carbon nanotubes
  • Electrochemical modification treatment method of carbon nanotubes

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Using metal as the substrate, first spraying iron on the substrate as a catalyst, and then growing carbon nanotubes on the substrate by chemical vapor deposition, figure 1 It is a scanning electron microscope picture of carbon nanotubes grown on a metal substrate, and the diameter of carbon nanotubes is about 80nm. The metal substrate grown with carbon nanotubes is cut into small metal sheets to prepare electrodes. In a 1mol / L potassium hydroxide solution in an electroplating tank, carbon nanotubes were used as the working electrode, and a constant voltage of 0.8V was applied to the working electrode for 5 minutes through a CHI660A electrochemical workstation. figure 2 It is the scanning electron microscope picture after treatment modification. from figure 2 It can be seen that the carbon nanotubes are cut into many small segments, and the defects of the walls and ends of the carbon nanotubes are significantly increased, resulting in a significant increase in the sp...

Embodiment 2

[0035] Preparation of carbon nanotube electrodes As described in Example 1, the metal substrate grown with carbon nanotubes was cut into small metal sheets to prepare electrodes. In a 1mol / L potassium hydroxide solution, carbon nanotubes were used as the working electrode, and a constant voltage of 5 V was applied to the working electrode for 3 minutes through a CHI660A electrochemical workstation. image 3 It is the scanning electron microscope picture after treatment modification. from image 3 It can be seen from the figure that after being treated by this method, the original carbon nanotubes are cut into many small segments, and the defects of the tube walls and ends of the carbon nanotubes are significantly increased, resulting in a significant increase in the specific surface area and an increase in catalytic efficiency.

Embodiment 3

[0037] Preparation of carbon nanotube electrodes As described in Example 1, the metal substrate grown with carbon nanotubes was cut into small metal sheets to prepare electrodes. In a 1mol / L potassium hydroxide solution, carbon nanotubes were used as the working electrode, and a constant voltage of 1V was applied to the working electrode for 4 minutes through a CHI660A electrochemical workstation. Figure 4 It is the test picture of the water drop contact angle on the surface of untreated carbon nanotubes, and the contact angle of the water drop in the figure is 141°. It can be seen from the figure that water droplets do not spread on the surface of carbon nanotubes at all, and the surface of carbon nanotubes is superhydrophobic. Figure 5 It is the test picture of the water drop contact angle on the surface of the treated carbon nanotube, and the contact angle of the water drop in the figure is 53°. It can be seen from the figure that water droplets can spread on the surface...

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Abstract

The invention discloses an electrochemical modification treatment method for carbon nanotubes, which belongs to the field of modification of nano functional materials. The invention uses carbon nanotubes as electrode materials in an electrolyte solution, and uses various electrochemical methods to modify the carbon nanotube electrodes by applying voltage or current treatment through electrochemical instruments. After the carbon nanotubes are modified by the method of the invention, the specific surface area of ​​the carbon nanotubes is significantly increased, the hydrophilicity is obviously enhanced, and the capacitance properties such as charge capacity, charge and discharge current density, and cycle times are also significantly improved. In addition, the modified carbon nanotubes still maintain the original unique and efficient electron transfer characteristics. The carbon nanotubes modified by the method of the invention can be used in the field of nano functional materials such as high-efficiency electrocatalytic materials, supercapacitor materials and carriers of novel surface functionalized composite materials.

Description

technical field [0001] The invention belongs to the field of modification of nanometer functional materials, and in particular relates to an electrochemical modification treatment method of carbon nanotubes. Background technique [0002] Since Iijima reported the discovery of carbon nanotubes in 1991, carbon nanotubes have been a research hotspot in the field of nanofunctional materials. Nanotubes are seamless, hollow tubes rolled into graphene sheets formed by carbon atoms, and are generally divided into single-walled carbon nanotubes (SWNTs) and multi-walled carbon nanotubes (MWNTs). Carbon nanotubes have broad application prospects in many fields because of their unique structure, electrical, optical, magnetic properties and mechanical properties. However, because carbon nanotubes are insoluble in water and common organic solvents, their application is greatly limited, so the modification of carbon nanotubes to improve their solubility has aroused great interest of resea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02C09C1/48C09C3/00
Inventor 叶建山莫光权张叶臻张伟德张嘉琪
Owner SOUTH CHINA UNIV OF TECH
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