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Preparation method for two-dimensional supported nanometer magnesium hydride hydrogen storage material

A hydrogen storage material and load-type technology, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve the problems of low yield of nano-MgH, no way to make large-scale preparation, hidden safety hazards, etc., to achieve low cost, Low energy consumption and high safety effect

Active Publication Date: 2019-02-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the liquid-phase organic method can prepare MgH at a lower hydrogen pressure (3.5-5MPa), 2 , but it needs to be heated to a higher temperature (>200°C) to hydrogenate Mg, which still has potential safety hazards; so far, nano-sized MgH has not been prepared at room temperature. 2 related reports
At the same time, the nanosized MgH 2 The output is very low, because the solution method is limited by the concentration of raw materials in the solution (nanoparticles can be prepared at a lower concentration, and the output is ≤ 100 mg in a given container with a capacity of 500 ml), there is no way to carry out large-scale preparation

Method used

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  • Preparation method for two-dimensional supported nanometer magnesium hydride hydrogen storage material
  • Preparation method for two-dimensional supported nanometer magnesium hydride hydrogen storage material
  • Preparation method for two-dimensional supported nanometer magnesium hydride hydrogen storage material

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Two-dimensional supported nano-magnesium hydride MgH 2 Preparation of @25wt.% GR.

[0050] With 99% dibutyl magnesium dissolved in 1M ether and hexane solution as raw material, graphene (GR) as two-dimensional carrier, according to MgH 2 : GR=3:1 mass ratio, (the molar ratio is 1:0.75) calculate the amount of raw materials (please indicate the molar ratio of metal organic compound and graphene). Under the protection of high-purity argon (99.999%), dibutylmagnesium and graphene were placed in the ball mill tank (250ml) of the ball mill, and the ball-to-material ratio in the ball mill process was 40:1. Before ball milling, evacuate the spherical tank to a vacuum of 1×10 3 pa, then filled with hydrogen gas with a purity of ≥99% and 5.0 MPa, and then ball milled at room temperature for 24 hours at a rotational speed of 200 rpm to obtain a suspension of the reaction product. The suspension of the ball mill reaction product was suction filtered; then the suction filtered s...

Embodiment 2

[0054] Two-dimensional supported nano-magnesium hydride MgH 2 Preparation of @25wt.% GR.

[0055] With 99% dibutyl magnesium dissolved in 1M ether and hexane solution as raw material, graphene (GR) as two-dimensional carrier, according to MgH 2 :GR=3:1 mass ratio, (the molar ratio is 1:0.75) to calculate the amount of raw materials. Under the protection of high-purity argon (99.999%), dibutylmagnesium and graphene were placed in the ball mill tank (250ml) of the ball mill, and the ball-to-material ratio in the ball mill process was 40:1. Before ball milling, evacuate the spherical tank to a vacuum of 1×103pa, then fill it with hydrogen with a purity of ≥99% and 5.0 MPa, and then ball mill at room temperature for 24 hours at a rotational speed of 350rpm to obtain a product suspension. The suspension of the ball milling reaction product was suction filtered; then the suction filtered sample was vacuum dried at a temperature of 200°C and an air pressure of 1×102pa to obtain a t...

Embodiment 3

[0063] Two-dimensional supported nano-magnesium hydride MgH 2 Preparation of @80wt.% GR.

[0064] With 99% dibutyl magnesium dissolved in 1M ether and hexane solution as raw material, graphene (GR) as two-dimensional carrier, according to MgH 2 :GR=1:4.1 mass ratio (molar ratio is 1:9) to calculate the amount of raw materials. Under the protection of high-purity argon (99.999%), dibutylmagnesium and graphene were placed in the ball mill tank (250ml) of the ball mill, and the ball-to-material ratio in the ball mill process was 40:1. Before ball milling, evacuate the spherical tank to a vacuum of 1×10 3 pa, then filled with 2.0 MPa hydrogen with a purity of ≥99%, and then ball milled at room temperature for 10 h at a rotational speed of 200 rpm to obtain a product suspension. The suspension of the ball mill reaction product was suction filtered; then the suction filtered sample was vacuum dried at a temperature of 200°C and an air pressure of 1×10 5 pa, to obtain two-dimensi...

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Abstract

The invention discloses a preparation method for a two-dimensional supported nanometer magnesium hydride hydrogen storage material. The preparation method comprises the following steps of (1) by taking a magnesium metal-contained organic compound and graphene as raw materials, under argon shield, performing ball milling at a room temperature and a hydrogen atmosphere, and performing hydrogenationon the magnesium metal-contained organic compound to obtain suspension liquid of graphene supported magnesium hydride as a reaction product; and (2) performing suction filtration and drying on the obtained reaction product to obtain the two-dimensional supported nanometer magnesium hydride hydrogen storage material. The preparation method provided by the invention has the advantages of reduced cost, simplified synthetic method, simple technological process, high production efficiency, low energy consumption, high process safety and relatively large yield; and in addition, the two-dimensional supported nanometer magnesium hydride prepared by the preparation method has high hydrogen storage capacity and excellent cycling stability, has very large potential on the aspects of hydrogen storageand conveying, fuel cells and the like and is a hydrogen storage material with great application prospect.

Description

technical field [0001] The invention relates to a method for preparing a hydrogen storage material, in particular to a method for directly synthesizing a nanometer metal hydride hydrogen storage material by liquid phase reaction ball milling. Background technique [0002] MgH 2 Candidate hydrogen storage materials show particularly good prospects: high specific gravity, specific volume hydrogen storage performance, abundant raw materials (the content in the earth's crust is about 2.5%, in fact, the content in seawater is almost infinite), low cost , non-toxic and high safety. In industry, the direct synthesis of MgH under high pressure hydrogen (10MPa) and high temperature (400°C) 2 , the prepared sample particle size is large and uneven. In the early days, the literature J Huot, G Liang, S Boily, A.V.Neste, R.Schulz.J.AlloysCompd., 1999, s293–295(51):495-500, used traditional mechanical ball milling to prepare MgH with uniform small particles 2 . However, its thermodyn...

Claims

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Application Information

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IPC IPC(8): C01B3/00
CPCC01B3/0078Y02E60/32
Inventor 肖学章程昶钧陆赟豪陈立新
Owner ZHEJIANG UNIV
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