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Magnesium and multi-wall nano carbon tube composite hydrogen storage material and process for preparing same

A technology of multi-walled carbon nanotubes and hydrogen storage materials, which is applied in the direction of electrical components, circuits, battery pack components, etc., can solve the problem of high hydrogen depletion temperature, slow magnesium dehydrogenation speed, and composite hydrogen storage materials that have not achieved comprehensive integration Performance and other issues, to achieve the effect of reducing decomposition temperature, promoting rapid production, improving direct activation and hydrogenation effect

Inactive Publication Date: 2005-11-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, magnesium has two serious disadvantages: one is that the hydrogen absorption and desorption rate of magnesium is very slow; the other is that the hydride of magnesium is too stable and the working temperature of hydrogen desorption is high (when H 2 When the partial pressure is 1 atmosphere, MgH 2 The decomposition temperature is 286°C (559K)
[0016] None of the above composite hydrogen storage materials has made progress in comprehensive overall performance

Method used

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  • Magnesium and multi-wall nano carbon tube composite hydrogen storage material and process for preparing same
  • Magnesium and multi-wall nano carbon tube composite hydrogen storage material and process for preparing same
  • Magnesium and multi-wall nano carbon tube composite hydrogen storage material and process for preparing same

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Effect test

Embodiment 1

[0037] 200 mesh magnesium powder (purity is 98%) plus 5wt.% MWNTs (about 30nm outer diameter, multi-walled carbon nanotubes were used by the Advanced Carbon Materials Research Department of Shenyang Materials Science National (United) Laboratory, Institute of Metal Research, Chinese Academy of Sciences. Prepared and provided by catalytic pyrolysis) weighed according to a certain mass ratio to form (2.85 parts of Mg+0.15 parts of MWNTs) components, and then add 0.02 parts of Y 2 o 3 Ni powder (purity is 4N) and 0.10 parts of Ni powder (purity is 99.6%) are fully ground and mixed in an agate bowl, and then placed together with steel balls with a diameter of 6 to 12 mm and sealed in a ball mill jar. The ball-to-powder ratio is 20:1, after repeated vacuuming and hydrogen passing operations, filled with 0.1MPa high-purity hydrogen (purity 99.99%), and ball milled at room temperature for 5 hours to prepare Mg / 5wt.%MWNTs composite material. The hydrogen storage and release capacity ...

Embodiment 2

[0045] 150 mesh magnesium powder (purity 98%), 5wt.% MWNTs (about 50nm outer diameter) were weighed according to a certain mass ratio to form (2.85 parts of Mg+0.15 parts of MENTs) components, and then 0.01 parts of Zr powder (purity 98%) and 0.10 part of Ni powder (purity is 99.6%), ball powder ratio is 15: 1, is filled with 0.1MPa high-purity hydrogen (purity is 99.99%), ball milling 12 hours at normal temperature, according to embodiment 1 Mg / 5wt.%MWNTs composites were prepared by the same method. Figure 3 is the TEM morphology and SEAD diffraction pattern of the composite material. Figure 3(a) is the bright-field image of composite particles, showing that various samples are fully composited, dense and uniform. Figure 3(b) is the electron diffraction pattern related to Figure 3(a), where Mg, MgH 2 The diffraction rings are very obvious. Figure 3(c) and Figure 3(d) are the Mg and MgH in Figure 3(b), respectively 2 The corresponding dark-field images of the diffraction r...

Embodiment 3

[0048] Weigh 100 mesh magnesium powder (purity 98%) and MWNTs (outer diameter about 100nm) according to a certain mass ratio to form (2.40 parts Mg+0.60 parts MWNTs) component, then add 0.01 part Zr powder (purity 98% ) and 0.12 parts of Ni powder (purity is 99.6%), ball powder ratio is 10: 1, fills with 0.1MPa high-purity hydrogen (purity is 99.99%), ball milling time 30 hours at normal temperature, press the same method of embodiment 1 Preparation of Mg / 20wt.% MWNTs composites. Test by the test analysis method of embodiment 1.

[0049] The maximum hydrogen storage capacity of composite Mg / 20wt.% MWNTs is 0.90wt.%, 2.11wt.%, 2.68wt.% and 2.75wt. %. At the above-mentioned temperatures, 80% of the maximum hydrogen storage capacity is completed in 20, 15, 5 and 5 minutes respectively; the hydrogen absorption speed is roughly the same at 473K and 553K, slightly slower at 373K, and the slowest at 298K.

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Abstract

The present invention relates to light nanometer composite hydrogen storage material, which comprises Mg and multi-wall nanometer carbon tube (MWNTs) and the composition expression is Mg / (x-wt%)MWNTs, here 0<xíœ50. The Mg nanometer crystal is hydrogenated to form large quantity of hydrogenation phase MgH2 of nanometer structure and catalysis phase of multi-wall nanometer carbon tube debris. These three phases tightly connect to each other, forming uniform dispersion distribution. The preparation method is: Mg powder is mixed with multi-wall nanometer carbon tube and then ball-ground in hydrogen atmosphere to undertake catalysis reaction. The method combines the preparation, activation and hydrogenation of composite material in one process. The invention has the advantages of high power of the storage and release of hydrogen, high velocity of the absorption and release of hydrogen, moderate operation temperature, low weight, low production cost, abound resources and safety in storage and transportation. It can be used for the mass production, storage and transportation of hydrogen, the hydrogen carrier of fuel cell, the purge and purification of hydrogen, and organic hydrogenation engineering.

Description

technical field [0001] The invention relates to a composite hydrogen storage material, and in particular provides a light magnesium / multi-wall nanometer carbon tube (Mg / MWNTs) nanocomposite hydrogen storage material and a hydrogenation catalytic reaction ball milling preparation method thereof. Background technique [0002] Energy is the material basis for the survival and development of human society. Hydrogen energy is the most ideal clean renewable energy in the 21st century, and it has the advantages of being storable and transportable. At present, it is an ideal zero-pollution vehicle energy source. In recent years, breakthroughs in proton exchange membrane fuel cell (PEMFC) technology have laid the foundation for the large-scale utilization of hydrogen energy in engineering fields such as electric vehicles and thrustless submarines. [0003] The world's six major automobile manufacturing companies have invested a lot of manpower, material resources and financial reso...

Claims

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Application Information

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IPC IPC(8): C22C23/00
CPCY02E60/10
Inventor 陈东刘实陈廉王隆保
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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