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Method for preparing nano-structure of magnesium

A nanostructure and block-forming technology is applied in the field of preparation of magnesium nanostructures, which can solve the problems of less than 20% Mg actual content, growth of nanoparticles, easy hydrolysis and oxidation of nanoparticles, etc., and achieves low cost and diffusion distance. The effect of reduced, excellent hydrogen absorption and desorption kinetic properties

Inactive Publication Date: 2009-11-11
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the activity of Mg is very strong, and the obtained nanoparticles are easy to aggregate and grow, and the nanoparticles are easy to hydrolyze and oxidize.
Therefore, there are few reports of Mg with a particle size below 30 nanometers, and the reported Mg nanoparticles also contain a large amount of impurities, and the actual content of Mg is less than 20% (see Chem.Mater.19, 6052 (2007); Chem. Mater. 20, 376(2008).)

Method used

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  • Method for preparing nano-structure of magnesium
  • Method for preparing nano-structure of magnesium
  • Method for preparing nano-structure of magnesium

Examples

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Effect test

Embodiment 1

[0019] Embodiment 1, synthetic particle size is the Mg particle of 20nm

[0020] (1) Put MgO and activated carbon with a molar ratio of 1:2 into a ball mill jar, take out after ball milling at a speed of 200rpm for 2 hours, and press into tablets under a pressure of 700bar;

[0021] (2) Put the pressed sheet in a hydrogen plasma arc heating furnace, and after vacuuming, under an Ar atmosphere with a total pressure of 0.8 bar, apply DC arc plasma to obtain Mg nanoparticles;

[0022] (3) Stop heating and vacuumize. After the system cools down, slowly pass air into the furnace for passivation, and take out the sample after 48 hours of passivation.

Embodiment 2

[0023] Embodiment 2, synthetic particle size is the Mg particle of 20nm

[0024] (1) Put MgO and activated carbon with a molar ratio of 1:3 into a ball mill jar, take out after ball milling at a speed of 200rpm for 2 hours, and press into tablets under a pressure of 700bar;

[0025] (2) Put the pressed sheet in a hydrogen plasma arc heating furnace. After vacuuming, arc discharge is started under an Ar atmosphere with a pressure of 0.9 bar, and then part of the Ar gas is extracted, and N 2 Gas, 40% N at a total pressure of 0.9 bar 2 In / Ar mixed atmosphere, apply DC arc plasma to obtain Mg nanoparticles;

[0026] (3) Stop heating and vacuumize. After the system cools down, slowly pass air into the furnace for passivation, and take out the sample after 48 hours of passivation.

Embodiment 3

[0027] Embodiment 3, synthetic particle size is the Mg particle of 20nm

[0028] (1) Put MgO and activated carbon with a molar ratio of 1:3 into a ball mill jar, take it out after ball milling at a speed of 200rpm for 2 hours, add a small amount of polyvinylidene fluoride (PVDF) as a binder, and make small ball;

[0029] (2) Put the ball in the hydrogen plasma arc heating furnace, after vacuuming, start the arc discharge in the Ar atmosphere with a pressure of 0.5 bar, then extract part of the Ar gas, and pass it into the H 2 Gas, 40% H at a total pressure of 0.5 bar 2 In / Ar mixed atmosphere, apply DC arc plasma to obtain Mg nanoparticles;

[0030] (3) Stop heating and vacuumize. After the system cools down, slowly pass air into the furnace for passivation, and take out the sample after 48 hours of passivation.

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Abstract

The invention provides a method for preparing a nano-structure of magnesium, which includes the following steps of: fully mixing MgO powder with C powder to make a block; then adopting an electric-arc heating method for evaporation to generate the nano-structure of magnesium; and selecting a variety of carbons to adjust the appearances of the nano-structure of magnesium. The method is simple in the device, high in resultant velocity, low in cost, and easy for realizing industrialized batch production. Products of the nano-structure of magnesium, which is obtained via the method, are less than 30 nanometers in dimension, with high purity and controllable appearances and structures. Besides, products of the nano-structure of magnesium have superb kinetic property for absorbing / desorbing hydrogen, with promising application prospects.

Description

technical field [0001] The invention relates to the field of metal preparation and the field of hydrogen storage technology, especially the preparation method and application of magnesium nanostructures. Background technique [0002] At present, due to the depletion of traditional energy sources such as coal, oil, and natural gas, and the increasing emphasis on environmental protection issues, the development and utilization of new energy sources has become a topic of close concern around the world. Among them, hydrogen energy is one of the most promising energy sources to be widely used in the 21st century due to its high specific mass energy content and clean and pollution-free characteristics. However, the utilization of hydrogen energy involves the key step of storage, so how to store hydrogen safely and effectively has become an urgent issue to be solved. At present, the research on hydrogen storage materials mainly includes metal hydrides, metal-organic framework comp...

Claims

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Application Information

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IPC IPC(8): B22F9/28
Inventor 谢镭李瑶琦张旋洲李星国
Owner PEKING UNIV
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