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Magnesium metal hydride phosphate complex hydrogen storage composite material and preparation method

A phosphate double salt and composite material technology, applied in the production of hydrogen, etc., can solve the problems of limitation, high price, and unobvious improvement of dehydrogenation temperature, and achieve the effects of less energy consumption, low cost, and improved hydrogen absorption and desorption performance

Inactive Publication Date: 2015-04-29
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Documents I.E.Malka, M.Pisarek, T.Czujko, J.Bystrzycki.Journal of Hydrogen Energy.36(2011) 12909-12917 proposed that MgH 2 Adding a series of transition metal halides in the alloy, the hydrogen absorption and desorption rate of the alloy obtained by ball milling has been improved, but the dehydrogenation temperature is not significantly improved. At the same time, some transition metal halides such as NbF 5 The price is relatively expensive, which limits its practicality

Method used

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  • Magnesium metal hydride phosphate complex hydrogen storage composite material and preparation method
  • Magnesium metal hydride phosphate complex hydrogen storage composite material and preparation method
  • Magnesium metal hydride phosphate complex hydrogen storage composite material and preparation method

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Effect test

Embodiment 1

[0019] In an argon-protected glove box, the MgH 2 Add 15wt.% LiFePO to the powder 4 Powder, mixed and placed in a ball mill tank, the ball mill is Pulverisette6 planetary ball mill, the ball quality is stainless steel, the mass ratio of the ball to material is 40:1, the speed is 450r / min, and the high-purity argon gas of 0.1MPa is charged for ball milling, and the ball milling time is 2h, 30min each ball milling, 15min intervals, after the 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 Add LiFePO 4 The hydrogen storage composite material prepared after ball milling can reach 80% of the maximum hydrogen absorption capacity in 600s, and in about 21 minutes, the hydrogen absorption cap...

Embodiment 2

[0021] In an argon-protected glove box, the MgH 2 Add 20wt.% LiFePO to the powder 4 The powder is mixed and placed in a ball mill tank. The ball mill is Pulverisette6 planetary ball mill. The ball quality is stainless steel. 3h, 30min each ball milling, 20min intervals, after the ball milling, naturally cool down to room temperature, 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 Add LiFePO 4 The hydrogen storage composite material prepared after ball milling can reach 80% of the maximum hydrogen absorption capacity in 580s, without adding LiFePO 4 MgH 2 It takes 900 seconds for the sample to reach 80% of the maximum hydrogen absorption capacity. It can be seen that the phosphate provided by the invention and MgH 2 The hydrogen sto...

Embodiment 3

[0023] In an argon-protected glove box, the MgH 2 Add 35wt.% LiFePO to the powder 4 The powder is mixed and placed in a ball mill tank. The ball mill is Pulverisette6 planetary ball mill, the ball quality is stainless steel, the mass ratio of the ball to material is 40:1, the speed is 450r / min, and the high-purity argon gas of 0.3MPa is charged for ball milling. The ball milling time 3h, 30min each ball milling, 30min intervals, after the ball milling, naturally cool to room temperature, 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 623K in the figure that the MgH 2 Add LiFePO 4 The hydrogen storage composite material prepared after ball milling can reach 80% of the maximum hydrogen release capacity in 600s and the maximum hydrogen release capacity can reach 2.69w.t.% ...

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Abstract

The invention discloses a magnesium metal hydride phosphate complex hydrogen storage composite material and a preparation method. The hydrogen storage composite material consists of MgH2 powder and a phosphate complex, wherein the content of the phosphate complex is 15-35% of the mass of the composite material, and the phosphate complex is one of LiFePO4 and LiCoPO4. The preparation method of the hydrogen storage composite material comprises the steps of putting the MgH2 powder and phosphate complex into a ball milling tank under the protection of argon atmosphere; performing intermittent ball milling treatment under 0.1-0.5MPa high-purity argon to obtain the hydrogen storage composite material. The hydrogen absorption / desorption speed of the hydrogen storage composite material disclosed by the invention is improved to over three times as compared with the MgH2 without phosphate; meanwhile, the preparation process is simple, the energy consumption is little, the preparation cost is low, and industrialization and popularization are easy to realize.

Description

technical field [0001] The invention relates to a hydrogen storage composite material and a preparation method. Background technique [0002] With the development of society, the primary energy represented by coal, oil and natural gas is exhausted day by day, and it brings huge pollution to the environment. Therefore, it is imminent to find a new energy source to replace the primary energy source. As a new type of energy, hydrogen energy has attracted widespread attention because of its cleanness, pollution-free and environmental friendliness. However, the storage of hydrogen is a bottleneck affecting the practical application of hydrogen energy. Over the years, many scholars believe that the use of hydrogen storage materials to store hydrogen is considered safe and efficient. Currently due to Mg / MgH 2 The system is widely favored because of its high hydrogen storage capacity, low cost and easy availability, and good cycle performance. However, its high hydrogen desorptio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/02
Inventor 韩树民程颖张伟赵鑫李靖沈娜
Owner YANSHAN UNIV
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