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Two-dimensional titanium carbide-doped sodium aluminum hydride hydrogen storage material and preparation method thereof

A two-dimensional titanium carbide and sodium aluminum hydride technology, which is applied in titanium carbide, chemical instruments and methods, and various metal hydrides, can solve the problems of poor hydrogen desorption kinetics, different catalytic effects, and high dehydrogenation temperature. Achieve the effects of improving hydrogen storage performance, reducing induction period, and simple preparation process

Active Publication Date: 2019-11-12
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In order to prove that Ti2C is also used as the catalyst, but due to different hydrogen storage materials, Ti2 The catalytic effect of C produced a significant difference
The present invention additionally prepares a hydrogen storage material using LiAlH4 as a hydrogen storage material and Ti2C as a catalyst through Comparative Example 2, and tests the hydrogen production performance. When Ti2C is 5 wt%, the initial dehydrogenation temperature of LiAlH4 is 72 ℃, and when the temperature rises to 300 ℃, the The total hydrogen release amount is about 5 wt%, and the two-dimensional titanium carbide doped sodium aluminum hydride hydrogen storage material prepared by the present invention, that is, using NaAlH4 as the hydrogen storage material, Ti 2C as the hydrogen storage material of the catalyst for comparison, it can also be concluded that the same Ti2C is used as the catalyst, but due to the different alkali metal elements, the Ti2C produced a significant difference conclusion
[0014]Therefore, the MXene material catalytic metal coordination hydride technical solutions provided by the prior art all present the following technical problems: 1) The initial hydrogen desorption temperature is relatively high; 2 ) The kinetic performance of hydrogen desorption is poor, and the amount of hydrogen desorption is low

Method used

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  • Two-dimensional titanium carbide-doped sodium aluminum hydride hydrogen storage material and preparation method thereof
  • Two-dimensional titanium carbide-doped sodium aluminum hydride hydrogen storage material and preparation method thereof
  • Two-dimensional titanium carbide-doped sodium aluminum hydride hydrogen storage material and preparation method thereof

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Experimental program
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Embodiment 1

[0045] A method for preparing a two-dimensional titanium carbide-doped sodium aluminum hydride hydrogen storage material, comprising the following steps:

[0046] Step 1) 2D Ti 2 C prepared from Ti with a particle size of 10 μm 2 AlC ceramic powder as raw material, with Ti 2 The addition concentration of AlC ceramic powder is 0.1 g / ml, and Ti 2 The AlC ceramic powder was immersed in a hydrofluoric acid solution with a concentration of 15 wt%, and reacted under the condition of magnetic stirring for 10 h at a reaction temperature of 30 °C, washed with deionized water until the pH of the solution was 7, and pumped under reduced pressure. filter, and dry in vacuum at 80 °C for 12 h to obtain two-dimensional titanium carbide Ti 2 C;

[0047] Step 2) two-dimensional titanium carbide doped sodium aluminum hydride hydrogen storage material (Ti 2 C content is 1wt%) preparation, under the protection of argon, weigh 0.005 g step 1 obtained two-dimensional layered titanium carbide T...

Embodiment 2

[0059] A two-dimensional titanium carbide doped sodium aluminum hydride hydrogen storage material (Ti 2 C content is the preparation method of 7 wt%), and the step of not specifying is identical with embodiment 1, and difference is: in described step 2.1, Ti 2 The amount of C added was 7 wt%, and 0.035 g of two-dimensional titanium carbide Ti was weighed in an argon atmosphere glove box. 2 C and 0.465 g NaAlH 4 .

[0060] Will get Ti 2 The sodium aluminum hydride hydrogen storage material with a C content of 7 wt% was subjected to a temperature-rising dehydrogenation test, the test method was the same as in Example 1, and the test results were as follows image 3As shown, the initial hydrogen desorption temperature is 75 ℃, and the hydrogen desorption amount is 4.9 wt% when the temperature rises to 300 ℃.

Embodiment 3

[0062] A two-dimensional titanium carbide doped sodium aluminum hydride hydrogen storage material (Ti 2 C content is the preparation method of 9 wt%), and the steps not specified in particular are the same as in Example 1, except that: in the step 2.1, Ti 2 The amount of C added was 9 wt%, and 0.045 g of two-dimensional titanium carbide Ti was weighed in an argon atmosphere glove box. 2 C and 0.455 g NaAlH 4 .

[0063] Will get Ti 2 The sodium aluminum hydride hydrogen storage material with a C content of 7 wt% was subjected to a temperature-rising dehydrogenation test. The test method was the same as in Example 1, and the test results were as follows image 3 As shown, the initial hydrogen desorption temperature is 92 ℃, and the hydrogen desorption amount is 5.4wt% when the temperature rises to 300 ℃.

[0064] Therefore, Ti 2 The hydrogen desorption performance of sodium aluminum hydride hydrogen storage material with C content of 1 wt% is the best. Such as image 3 As...

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Abstract

The invention discloses a two-dimensional titanium carbide-doped sodium aluminum hydride hydrogen storage material. The hydrogen storage material is prepared by mixing and ball milling of sodium aluminum hydride and two-dimensional titanium carbide (Ti2C); and the two-dimensional titanium carbide (Ti2C) has a two-dimensional sheet stacking structure. The preparation method comprises the followingsteps: 1) preparation of two-dimensional Ti2C; and 2) preparation of the two-dimensional titanium carbide-doped sodium aluminum hydride hydrogen storage material. When the material is applied to the hydrogen storage field and the doping amount of a catalyst is 1 wt%, the hydrogen evolution temperature of the system drops to 45 DEG C, and the hydrogen evolution amount reaches 6.0 wt%; and when thedoping amount of the catalyst is 9 wt%, the hydrogen evolution temperature of the system drops to 92 DEG C and the hydrogen evolution amount reaches 5.4 wt%. The preparation method has the following advantages: 1, the hydrogen evolution performance of sodium aluminum hydride is effectively improved, the doped sodium aluminum hydride material has a high hydrogen storage capacity and a high hydrogenevolution rate under mild conditions, the initial hydrogen evolution temperature drops to 45 DEG C, and the hydrogen evolution amount reaches 6.0 wt%; 2, Ti2C used as a catalyst is matched with the sodium aluminum hydride hydrogen storage material; and 3, the preparation method has the characteristics of low cost, simple preparation process, controllable reaction and the like.

Description

technical field [0001] The invention relates to the technical field of hydrogen storage materials for new energy materials, in particular to a two-dimensional titanium carbide (Ti 2 C) Doped sodium aluminum hydride hydrogen storage material and its preparation method. Background technique [0002] With the development of society and the advancement of science and technology, energy has become one of the global focus issues facing mankind. Finding green, efficient and renewable new energy to replace fossil energy has become the development goal of all countries in the world. It is the solution to energy shortage and environmental pollution. key. Hydrogen energy has the advantages of rich sources of raw materials, environmentally friendly and renewable products, and has become one of the most potential alternative energy sources at present. At present, the development and utilization of hydrogen energy mainly faces three key problems of production, storage and transportation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/00C01B32/921C01B6/24
CPCC01B3/0078C01B32/921C01B6/243Y02E60/32
Inventor 孙立贤赵莉徐芬胡锦炀骆成夏永鹏张可翔李彬陈沛荣涂德贵汪震越尹庆庆岑文龙
Owner GUILIN UNIV OF ELECTRONIC TECH
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