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MgH2-BiVO4 hydrogen storage composite material and preparation method thereof

A technology of mgh2-bivo4 and composite materials, which is applied in the field of hydrogen storage composite materials and its preparation, can solve the problems of low hydrogen release capacity of magnesium-based composite materials, cannot meet wide application, and complicated preparation process, so as to improve hydrogen absorption/desorption The effect of high performance, easy operation and low preparation cost

Inactive Publication Date: 2014-06-18
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent No. 200810164115.6 discloses a kind of added smelted Mg 17 Al 12 And Ni prepared Mg-Al-Ni composite material by ball milling. Although the kinetic improvement effect of this patent is relatively obvious, the preparation process is relatively complicated and the cost is relatively high

Method used

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  • MgH2-BiVO4 hydrogen storage composite material and preparation method thereof
  • MgH2-BiVO4 hydrogen storage composite material and preparation method thereof
  • MgH2-BiVO4 hydrogen storage composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In an argon-protected glove box, take 2.7gMgH 2 and 0.3gBiVO 4 , placed in the ball mill jar after mixing, adopting Pulverisette6 planetary ball mill to carry out ball milling, put into stainless steel ball 45g, rotating speed is 450r / min, fill the high-purity argon gas of 0.1MPa and carry out ball milling, ball milling time is 1h, every ball milling 20min, Intermittently for 15 minutes, after ball milling, cool down to room temperature naturally, and package under an argon-protected glove box. The prepared MgH 2 Hydrogen storage composite materials were tested for hydrogen absorption rate, and the results were as follows: figure 1 shown. It can be seen from the hydrogen absorption rate curve at 423K in the figure that the MgH 2 BiVO 4 When the hydrogen storage composite material prepared after ball milling is about 400s, the hydrogen absorption capacity is that of pure MgH 2 3 times, and add BiVO 4 After that, the maximum hydrogen absorption capacity and hydroge...

Embodiment 2

[0019] In an argon-protected glove box, take 2.4gMgH 2 and 0.6gBiVO 4 , after mixing, put it in a ball mill tank, adopt Pulverisette6 planetary ball mill to carry out ball milling, put 60g of stainless steel balls, the rotating speed is 500r / min, fill in high-purity argon gas of 0.2MPa and carry out ball milling, the ball milling time is 2h, every ball milling 30min, Intermittently for 20 minutes, after ball milling, cool down to room temperature naturally, and package under an argon-protected glove box. The prepared MgH 2 Hydrogen storage composite materials were tested for hydrogen absorption rate, and the results were as follows: figure 2 shown. It can be seen from the hydrogen absorption rate curve at 473K in the figure that the MgH 2 BiVO 4 The hydrogen absorption rate of the hydrogen storage composite prepared after ball milling is significantly better than that without BiVO 4 MgH 2 . In addition, when the hydrogen absorption reaches 2wt%, adding BiVO 4 The hyd...

Embodiment 3

[0021] In an argon-protected glove box, take 2.1 g of MgH 2 and 0.9gBiVO 4 , placed in the ball mill jar after mixing, adopt Pulverisette6 planetary ball mill to carry out ball milling, put into stainless steel ball 75g, rotating speed is 500r / min, fill the high-purity argon gas of 0.3MPa and carry out ball milling, ball milling time is 2h, every ball milling 30min, Intermittently for 20 minutes, after ball milling, cool down to room temperature naturally, and package under an argon-protected glove box. The prepared MgH 2 Hydrogen storage composite materials were tested for hydrogen desorption rate, and the results were as follows: image 3 shown. It can be seen from the hydrogen desorption rate curve at 573K in the figure that the MgH 2 BiVO 4 The hydrogen release rate and hydrogen release capacity of the hydrogen storage composite materials prepared after ball milling have been greatly improved. At 700s, the MgH 2 -BiVO 4 The hydrogen release capacity of the composite...

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Abstract

The invention discloses an MgH2-BiVO4 hydrogen storage composite material which consists of MgH2 and BiVO4, wherein the content of the BiVO4 accounts for 10-40% of the total mass of the composite material. A preparation method of the hydrogen storage composite material comprises the following steps: in a glove box protected by argon, putting the MgH2 powder and the BiVO4 in a ball milling tank, and performing ball milling in the presence of 0.1-0.5MPa argon at a ball-material mass ratio of (15-35):1 and the revolving speed of 450-550r/min for 1-3 hours, wherein 15-25 minutes of intermittence is spaced between every two times of 20-45 minutes of ball milling; after the ball milling, naturally cooling to the room temperature so as to obtain the MgH2-BiVO4 hydrogen storage composite material. Under relatively low temperature, compared with the MgH2 without the addition of BiVO4, the hydrogen absorption rate and maximum hydrogen absorption amount of the hydrogen storage composite material are improved by more than one time; at the same time, the preparation method is simple, the preparation cost is low and the hydrogen storage composite material is suitable for industrialization-scale preparation.

Description

technical field [0001] The invention relates to a hydrogen storage composite material and a preparation method thereof. Background technique [0002] Energy is the material basis for human survival and development, including economic development, social progress, and technological development, all of which cannot be separated from energy consumption. With the significant increase in energy consumption, it will not be able to meet the socio-economic sustainable development in the near future. At the same time, water pollution and air pollution (greenhouse effect) caused by traditional energy consumption have caused great harm to human society and the natural environment, not only worsening the living environment of human beings, but also causing the extinction of a large number of animals and plants. Therefore, it is crucial to find a new energy source to meet human needs. As a new type of energy, hydrogen energy has attracted extensive attention due to its large reserves, ...

Claims

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Application Information

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IPC IPC(8): C01B3/04
CPCY02E60/36
Inventor 张伟沈娜程颖陈阳
Owner YANSHAN UNIV
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