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mg(bh 4 ) 2 -xcnts system hydrogen storage material and preparation method thereof

A hydrogen storage material and system technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, hydrogen, etc., can solve the problems of excessively stable thermodynamic properties, slow hydrogen release kinetics, and poor reversibility, etc. Achieve the effect of easy purchase, regular particle morphology and convenient operation

Inactive Publication Date: 2020-02-18
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Mg(BH 4 ) 2 There are still problems such as too stable thermodynamic properties, slow hydrogen desorption kinetics, and poor reversibility, which also affect the Mg(BH 4 ) 2 Developments in the Field of Practical Applications

Method used

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  • mg(bh <sub>4</sub> ) <sub>2</sub> -xcnts system hydrogen storage material and preparation method thereof
  • mg(bh <sub>4</sub> ) <sub>2</sub> -xcnts system hydrogen storage material and preparation method thereof
  • mg(bh <sub>4</sub> ) <sub>2</sub> -xcnts system hydrogen storage material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] This embodiment includes the preparation of six hydrogen storage materials, and the specific preparation methods are as follows:

[0032] Prepare the mixed raw materials used in Example 1-1 to Example 1-V according to the raw materials in Table 1 and the relationship between the amount of additive CNTs, and then put six parts of mixed raw materials into 50ml ball mill jars for mechanical ball milling, wherein the balls The weight ratio to the mixed raw material is 40:1, filled with 3bar hydrogen (H 2 ) for protection, the ball milling speed is 350rpm, the ball milling time is 10h, and in the ball milling process, every ball milling 6min rests for 6min, to prevent the sample Mg(BH 4 ) 2 Decomposition occurs, and the obtained ball milling product is the hydrogen storage material. Among them, the ball milling product of Example 1-I is a hydrogen storage material without doping CNTs, that is, a control material, while Examples 1-II to 1-VI are hydrogen storage materials d...

Embodiment 2

[0042] The additive CNTs was added to the raw material Mg (BH 4 ) 2 After mixing, the hydrogen storage material Mg(BH 4 ) 2 -5wt% CNTs system sample, the whole ball milling process is charged with 3bar of hydrogen (H 2 ) for protection, and rest for 6 minutes every 6 minutes during the ball milling process, and the ball milling product is Mg(BH 4 ) 2 -5wt% CNTs hydrogen storage material.

[0043] In this example, the hydrogen storage material samples prepared by different ball milling processes after dehydrogenation were tested for reabsorption performance. The temperature is 300°C, the results are shown in Table 2 and Figure 6 . From Figure 6 It can be seen that the hydrogen storage material prepared in Example 2-1 completed the hydrogen absorption test within 2h, and the hydrogen absorption amount was 2.0wt%. Therefore, when the doping amount of CNTs was 5wt%, the Mg ( BH 4 ) 2 hydrogen reabsorption performance. In addition, the hydrogen desorption performance ...

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Abstract

The invention relates to a Mg(BH4)2-xCNTs system hydrogen storage material and a preparation method thereof, and belongs to the technical field of a hydrogen storage material for a fuel battery. The preparation method comprises the following steps: a material mixing step: performing mixing treatment on a Mg(BH4)2 powder and CNTs according to a certain proportion to obtain a uniform mixture; and ahigh-energy ball-milling step: putting the mixture obtained in the material mixing step into a ball-milling tank and performing high-energy ball-milling treatment to obtain the Mg(BH4)2-xCNTs system hydrogen storage material. The raw materials in the preparation method are commercialized products and are easy to purchase, the raw materials are subjected to mechanical alloying by a high-energy ball-milling process, and the preparation process is simple and convenient to operate; the prepared products are mainly CNTs and Mg(BH4)2 phases, the granules have regular shapes, the size is nanometer and uniform, and the initial hydrogen discharge temperature is low; and rapid hydrogen discharge kinetic performance is achieved and the reversible performance is improved.

Description

technical field [0001] The present invention relates to a doped Mg(BH 4 ) 2 Based hydrogen storage material and preparation method thereof, especially relate to a kind of Mg(BH 4 ) 2 - The xCNTs system hydrogen storage material and its preparation method belong to the technical field of hydrogen storage materials for fuel cells. Background technique [0002] With the continuous deterioration of the environment and the increasing energy crisis, human beings are urgently seeking a clean energy source. Hydrogen energy is considered as an ideal clean energy, and hydrogen storage materials related to hydrogen energy technology have also attracted widespread attention at home and abroad. Hydrogen storage materials are a class of materials that have good adsorption properties for hydrogen or can reversibly react with hydrogen to realize the storage and release of hydrogen. The development of hydrogen storage materials is the key to solving the technical problems of hydrogen sto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/02B82Y30/00
CPCB82Y30/00C01B3/0078C01P2002/72C01P2004/64Y02E60/32
Inventor 武英蒋赞原建光张宝阎有花况春江周少雄
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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