A preparation method and hydrogen storage material of graphene-supported nanosheet transition metal hydride

A technology of transition metals and nanosheets, applied in the direction of transition element hydrides, chemical instruments and methods, non-metallic elements, etc., can solve the problems of high kinetic energy barrier, difficulty in reversible hydrogen absorption, low hydrogen storage capacity, etc., to achieve It is beneficial to the improvement of capacity, hydrogen desorption kinetics and cycle performance, and the effect of small particle size

Active Publication Date: 2022-05-27
ZHEJIANG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, the hydrogen storage capacity of traditional interstitial hydrogen storage alloys is generally low, less than 3wt%, which is difficult to meet the application requirements of vehicle-mounted hydrogen storage systems
But limited by the high kinetic energy barrier, its reversible hydrogen absorption is very difficult. Initially, NaAlH 4 Only used as a reducing agent in organic synthesis reactions

Method used

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  • A preparation method and hydrogen storage material of graphene-supported nanosheet transition metal hydride
  • A preparation method and hydrogen storage material of graphene-supported nanosheet transition metal hydride
  • A preparation method and hydrogen storage material of graphene-supported nanosheet transition metal hydride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Preparation of graphene-supported nanosheet titanium hydride catalysts:

[0047] (1) Titanium tetrachloride (2 mmol), lithium hydride (8 mmol), graphene (20 mg) and tetrahydrofuran (50 ml) were weighed in an argon atmosphere glove box, added to a stainless steel reaction vessel, and sealed.

[0048] (2) Transfer the closed stainless steel reaction vessel to a magnetic heating stirrer, and keep it at 100°C for 2 hours or at 100°C for 4 hours or 200°C for 2 hours.

[0049] (3) Perform vacuum suction filtration on the product in step (2) in an inert atmosphere glove box to obtain a solid powder.

[0050] (4) heating the solid powder obtained in step (3) to 70° C. for 6 hours under dynamic vacuum to remove residual tetrahydrofuran, and finally obtain a graphene-supported nano-sheet titanium hydride catalyst.

[0051] The samples prepared in the above process are: graphene-supported nano-sheet titanium hydride catalyst (NF-TiH 2 @G). figure 1 a is the transmission electro...

Embodiment 2

[0055] Add NF-TiH 2 @G's NaAlH 4 Preparation of hydrogen storage material: the NF-TiH of Example 1 (step 2 was kept at 100 °C for 2 h) 2 @G as catalyst with NaAlH 4 As a hydrogen storage material, NF-TiH was weighed separately in an argon atmosphere glove box 2 @G and NaAlH 4 , added to the ball mill jar, sealed, where NF-TiH 2 The mass fraction of @G in the mixture is 9 wt%. Transfer the ball mill jar to a ball mill, and perform ball milling. The ball milling speed is 500 rpm, the ball-to-material ratio is 120:1, and the ball milling time is 24 hours to obtain the hydrogen storage material NaAlH 4 +9wt%NF-TiH 2 @G. The hydrogen desorption kinetic performance of the hydrogen storage material was tested by the volume method, and the test conditions were under vacuum (the initial vacuum degree was 1×10 -3 Torr) was heated to 250°C at a heating rate of 2°C / min, the results are shown in figure 2 .

Embodiment 3

[0063] Add NF-TiH 2 @G's NaAlH 4 Preparation of hydrogen storage material: the NF-TiH of Example 1 (step 2 was kept at 100 °C for 2 h) 2 @G as catalyst with NaAlH 4 As a hydrogen storage material, NF-TiH was weighed separately in an argon atmosphere glove box 2 @G and NaAlH 4 , added to the ball mill jar, sealed, where NF-TiH 2The mass fraction of @G in the mixture is 9 wt%. Transfer the ball mill jar to a ball mill, and perform ball milling. The ball milling speed is 500 rpm, the ball-to-material ratio is 120:1, and the ball milling time is 24 hours to obtain the hydrogen storage material NaAlH 4 +9wt%NF-TiH 2 @G. The hydrogen desorption kinetic performance of the hydrogen storage material was tested by TPD (hydrogen release with temperature). The test conditions were heating to 250°C at a heating rate of 2°C / min under argon carrier gas. The results are shown in Figure 4 .

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Abstract

The invention relates to the field of hydrogen storage materials, and discloses a preparation method of a graphene-supported nano-flaky transition metal hydride and a hydrogen storage material. The preparation method of the nano-flaky transition metal hydride includes the following steps: under the protection of an inert gas , mixing transition metal chloride, lithium hydride, graphene and an organic solvent, separating and obtaining a solid substance after heating and reacting, and drying the solid substance to obtain the nanosheet-shaped transition metal hydride, the graphene-loaded transition metal hydride catalyst It can significantly improve the hydrogen absorption and desorption behavior of hydrogen storage materials, reduce the working temperature of hydrogen absorption and desorption, improve cycle performance, and easily remove by-products during the reaction process, while ensuring that transition metal hydrides will not be oxidized.

Description

technical field [0001] The invention relates to the field of hydrogen storage materials, in particular to a method for preparing a graphene-supported nano-sheet transition metal hydride and a hydrogen storage material. Background technique [0002] The growing demand for energy, the decreasing fossil energy and the deteriorating ecological environment make it urgent to develop clean and renewable energy. As the simplest and most abundant element in the universe, hydrogen has the advantages of high combustion calorific value, clean and pollution-free, and various forms of utilization. It is considered to be the most ideal energy carrier and is expected to solve this problem. Although hydrogen makes up 75% of the total mass of the universe, on Earth, the content of free hydrogen is only 0.5ppm, and under standard conditions, hydrogen is gaseous with a density of only 0.0899g L -1 , causing its practical application to face huge challenges in three aspects: preparation, storag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B6/02C01B3/00
CPCC01B6/02C01B3/001C01P2004/04C01P2002/80Y02E60/32
Inventor 刘永锋任壮禾张欣潘洪革高明霞
Owner ZHEJIANG UNIV
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