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Nano composite hydrogen-storing material and preparing method

A hydrogen storage material and nanocomposite technology, applied in chemical instruments and methods, hydrogen, and other chemical processes, etc., can solve the problems of poor kinetics, high storage and desorption temperatures, and achieve simple preparation process, high hydrogen storage capacity, The effect of excellent comprehensive hydrogen storage performance

Inactive Publication Date: 2006-03-08
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, Mg hydrogen storage has obvious disadvantages, that is, its hydrogen storage and desorption temperature is high (~673K), and its kinetics is poor.
In order to improve the kinetic performance of Mg hydrogen storage, people add catalysts to Mg to prepare nano-hydrogen storage materials by ball milling. However, from the current results, adding these catalysts has not fundamentally solved the thermodynamics of Mg storage and dehydrogenation. question

Method used

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  • Nano composite hydrogen-storing material and preparing method

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Embodiment 1

[0029] Purified single-walled carbon nanotubes have a purity of about 90% and a tube diameter of 1-2nm. Then the purified single-walled carbon nanotubes were mixed into the magnesium hydride powder prepared by reaction ball milling and mixed evenly (single-walled carbon nanotubes: MgH 2 =5:95, percent by weight), and then high-energy ball milling was carried out under the protection of argon, the ball-to-material ratio was 20:1, and the ball milling time was 10 hours. The hydrogen storage performance of the prepared nanocomposites was tested by volume method after desorption (such as Figure 4 with 5 Shown), the hydrogen pressure is 2MPa. At 573K, the hydrogen storage capacity is 6.67wt% in 600 seconds; at 473K, it can absorb 5.47wt% hydrogen in one hour, and the maximum hydrogen absorption rate is 6.35wt%; even at 423K, it can absorb 2.5% hydrogen in one hour. wt%, and the maximum hydrogen absorption can reach 4.8wt%. At 623K, the hydrogen desorption capacity of the prepa...

Embodiment 2

[0031] Purified single-walled carbon nanotubes have a purity of about 90% and a tube diameter of 1-2nm. Then the purified single-walled carbon nanotubes were mixed into the magnesium hydride powder prepared by reaction ball milling and mixed evenly (single-walled carbon nanotubes: MgH 2 =10:90, percent by weight), and then high-energy ball milling was carried out under the protection of argon, the ball-to-material ratio was 20:1, and the ball-milling time was 30 hours. The hydrogen storage performance of the prepared nanocomposites was tested by volume method after desorption (such as Figure 4 with 5 Shown), the hydrogen pressure is 2MPa. At 573K, the hydrogen storage capacity is 6.5wt%; at 473K, the hydrogen storage capacity is 6.0wt%.

Embodiment 3

[0033] Mix unpurified single-walled carbon nanotubes (containing Fe, Co, Ni catalysts) into magnesium hydride powder prepared by reaction ball milling and mix evenly (single-walled carbon nanotubes: MgH 2 =1:99, percent by weight), and then high-energy ball milling was carried out under the protection of argon, the ball-to-material ratio was 20:1, and the ball-milling time was 20 hours. The hydrogen storage performance of the prepared nanocomposites was tested by volume method after desorption (such as Image 6Shown), the hydrogen pressure is 2MPa. At 573K, the hydrogen storage capacity is 5.5wt%; at 473K, the hydrogen storage capacity reaches 4.6wt% within 10 minutes, and the maximum hydrogen storage capacity reaches 5.3wt%.

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Abstract

The present invention provides a nano composite hydrogen storage material. It is a mixture obtained by mixing 90 wt%-99 wt% of magnesium hydride and 1 wt%-10 wt% of nano carbon. Its preparation method includes the following steps: mixing nano carbon into magnesium hydride according to the required ratio, under the atmosphere of argon gas or hydrogen gas mechanically ball-grinding for 30 min-100 hr, then making desorption; or ball-grinding magnesium hydride for 1-100 hr, then adding nano carbon and ball-grinding for 30 min-10 hr, then making desorption. Its hydrogen storage capacity is 4.5 wt%-6.7 wt%.

Description

Technical field: [0001] The invention relates to a hydrogen storage material, in particular to a novel hydrogen storage material containing magnesium and nano-carbon and having a synergistic hydrogen storage effect, and also relates to a preparation method of the novel hydrogen storage material. Background technique: [0002] Environment, energy and sustainable development are the three major themes facing the world today, and hydrogen energy is one of the ideal clean energy sources. In recent years, the rapid development and commercialization of fuel cell vehicles has swept the whole world. Its high efficiency, energy saving, and good environmental performance of zero or near zero emissions make it a hot spot in the development of energy and transportation fields in the world today. However, the technical bottleneck in solving fuel cell vehicles is still the problem of hydrogen storage. [0003] As we all know, among the various metal hydrides currently studied, Mg has att...

Claims

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Application Information

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IPC IPC(8): B01J20/20C01B3/00C01B6/04
CPCY02E60/32
Inventor 成会明吴成章刘畅姚向东逮高清陈德敏
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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