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Preparation method of graphene-loaded nanosheet transition metal hydride and hydrogen storage material

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 problems such as high kinetic energy barrier, low hydrogen storage capacity, and difficulty in reversible hydrogen absorption, and achieve It is beneficial to the improvement of capacity, fine particle size, hydrogen desorption kinetics and cycle performance

Active Publication Date: 2021-07-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Preparation method of graphene-loaded nanosheet transition metal hydride and hydrogen storage material
  • Preparation method of graphene-loaded nanosheet transition metal hydride and hydrogen storage material
  • Preparation method of graphene-loaded nanosheet transition metal hydride and hydrogen storage material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

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

[0049] (3) In an inert atmosphere glove box, the product in step (2) is filtered under reduced pressure 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 nanosheet-shaped titanium hydride catalyst.

[0051] The sample prepared in the above process is: graphene-supported nanosheet titanium hydride catalyst (NF-TiH 2 @G). figure 1 a is the transmission electron microscope ...

Embodiment 2

[0055] Add NF-TiH 2 @G NaAlH 4 Preparation of hydrogen storage material: NF-TiH with Example 1 (step 2 adopts 100°C for 2h) 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 9wt%. Transfer the ball mill tank to a ball mill for 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 kinetics of the hydrogen storage material was tested by the volumetric method, and the test condition was under vacuum (the initial vacuum degree was 1×10 -3 Torr) 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 NaAlH 4 Preparation of hydrogen storage material: NF-TiH with Example 1 (step 2 adopts 100°C for 2h) 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 9wt%. Transfer the ball mill tank to a ball mill for 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. TPD (temperature dependent hydrogen desorption) was used to test the hydrogen desorption kinetics of the hydrogen storage material. The test condition was to heat up to 250°C at a heating rate of 2°C / min under an 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-loaded nanosheet transition metal hydride and a hydrogen storage material.The preparation method of the nanosheet transition metal hydride comprises the following steps that under protection of inert gas, mixing a transition metal chloride, lithium hydride, graphene and an organic solvent, heating reacting, separating to obtain a solid substance, drying the solid substance to obtain the nanosheet transition metal hydride. According to the graphene-loaded transition metal hydride catalyst, the hydrogen absorption and desorption behaviors of a hydrogen storage material can be remarkably improved, the hydrogen absorption and desorption working temperature can be reduced, the cycle performance can be improved, byproducts can be easily removed in the reaction process, industrial production. and meanwhile, the transition metal hydride is prevented from being oxidized.

Description

technical field [0001] The invention relates to the field of hydrogen storage materials, in particular to a preparation method of a graphene-loaded nano-flaky transition metal hydride and a hydrogen storage material. Background technique [0002] The ever-increasing demand for energy, the gradual reduction of fossil energy and the deteriorating ecological environment urgently require the development of 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 utilization forms. It is considered to be the most ideal energy carrier and is expected to solve this problem. Although hydrogen accounts for 75% of the total mass of the universe, on the 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 th...

Claims

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Application Information

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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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