One-dimensional hydrogen-storing carbon nano-material etched via microwave plasma and its prepn process

A technology of microwave plasma and hydrogen storage materials, applied in chemical instruments and methods, other chemical processes, etc.

Inactive Publication Date: 2003-02-26
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it should be noted that the hydrogen storage capacity of carbon nanotubes or carbon nanofibers that can be repeatedly verified is only 1 to 4.5 wt%.

Method used

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  • One-dimensional hydrogen-storing carbon nano-material etched via microwave plasma and its prepn process
  • One-dimensional hydrogen-storing carbon nano-material etched via microwave plasma and its prepn process
  • One-dimensional hydrogen-storing carbon nano-material etched via microwave plasma and its prepn process

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Implementing devices such as figure 1 , figure 2 shown.

[0024] The single-wall carbon nanotube is prepared by a hydrogen arc discharge method, and the prepared single-wall carbon nanotube has a purity of 60%, a tube diameter of 1-40 nm, and a tube length of 10-100 μm. After it was ground, it was placed in 2M NaOH solution, heated to reflux and ultrasonically oscillated for 1 h, then washed with deionized water and dried. The dried single-walled carbon nanotubes were treated with mixed acid (concentrated H 2 SO 4 : Concentrated HNO 3 =3:1) oxidation treatment for 1 h, washed with deionized water and dried. The above-mentioned pretreated single-walled carbon nanotubes were calcined in argon at 1000° C. for 2 h, then soaked in dilute sulfuric acid solution for 5 h, washed with deionized water, and dried. Under the conditions of hydrogen purity of 99.999%, initial pressure of 7Mpa, and room temperature, the hydrogen storage capacity of the defunctionalized single-w...

Embodiment 2

[0026] Multi-walled carbon nanotubes are prepared by catalytic cracking. The prepared multi-walled carbon nanotubes have a purity of 75 percent, a tube diameter of 10-80 nm, and a tube length of 20-100 μm or more. The pretreatment, defunctionalization treatment, microwave plasma etching process and hydrogen storage test conditions of the multi-walled carbon nanotubes are the same as in Example 1. Tests show that the hydrogen storage capacity of the defunctionalized multi-walled carbon nanometer is 1 wt%, and the hydrogen storage capacity of the etched multi-walled carbon nanotube is 2.5 wt%.

Embodiment 3

[0028] Carbon nanofibers are prepared by catalytic cracking. The prepared nano-carbon fiber has a purity of 78 percent, a tube diameter of 80-100 nm, and a tube length of more than 0.1 mm. The pretreatment, defunctionalization, microwave plasma etching process and hydrogen storage test conditions of the carbon nanofibers are the same as in Example 1. Tests show that the hydrogen storage capacity of the defunctionalized nano-carbon fiber is 2.5 wt%, and the hydrogen storage capacity of the etched nano-carbon fiber is 3.8 wt%.

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Abstract

The present invention is a kind of one-dimensional hydrogen-stored nanometer carbon material and its preparation process, and features that the surface of one-dimensional nanometer carbon is etched by using the plasma etching process, and this increases and expand hydrogen diffusing passage, makes nmore hydrogen enter the interior of one-dimensional nanometer carbon, and raises its hydrogen storing capacity. Carbon nanometer tube and / or carbon nanometer fiber are etched in the microwave plasma generator with etching power of 0.3-3 KW, etching temperature of 300-1500 deg.C, treating pressure of 600-6000 Pa, etching gas hydrogen and condition gas of nitrogen and / or argon. The one-dimensional nanometer carbon of the present invention has hydrogen capacity of 2.5-4.5 wt%.

Description

technical field [0001] The invention relates to a modified one-dimensional nano-carbon hydrogen storage material and its preparation technology, in particular to a high-performance one-dimensional nano-carbon hydrogen storage material prepared by a modification method of microwave plasma etching and its preparation technology. The one-dimensional carbon nanomaterials here refer to carbon nanotubes or carbon nanofibers. Background technique [0002] With the gradual increase of fossil fuel consumption and depletion of reserves, and people's increasing emphasis on environmental protection, people are increasingly eager to use environmentally friendly and renewable energy. At present, people place the most hope on hydrogen energy. Therefore, countries all over the world have invested a lot of manpower, material and financial resources in the research and development of hydrogen energy. But to develop hydrogen energy, the first thing to overcome is the large-scale storage and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C01B31/02C23F4/00
Inventor 木士春潘牧袁润章唐浩林董学斌
Owner WUHAN UNIV OF TECH
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