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Preparation method of Ti3C2MXene composite hydrogen storage material

A hydrogen storage material and powder technology, which is applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve the problems of electrode material powdering and falling off, large volume effect, and poor conductivity, so as to improve hydrogen storage performance and alleviate volume effect , improve the effect of cycle stability

Inactive Publication Date: 2019-03-15
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Tin-based materials have attracted widespread attention because of their high specific capacity. The theoretical capacity of simple tin is 990 mAh / g, which is about three times the capacity of graphite anode materials currently in commercial use. Significant volume effect (volume expansion of about 300%) leads to the powdering and falling off of electrode materials, which limits its practical application; SnS, as one of the tin-based materials, has a high theoretical specific capacity, but SnS itself has poor conductivity. Problems such as large volume effect in the circulation process greatly limit its application range

Method used

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  • Preparation method of Ti3C2MXene composite hydrogen storage material
  • Preparation method of Ti3C2MXene composite hydrogen storage material
  • Preparation method of Ti3C2MXene composite hydrogen storage material

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Effect test

Embodiment 1

[0042] A kind of Ti 3 C 2 The preparation method of MXene composite hydrogen storage material comprises the steps:

[0043] S1, Ti 3 C 2 Preparation: Weigh Ti with a purity greater than 98% 3 AlC 2 5g of powder, soak it in 50ml of HF acid with a mass fraction of 40%, stir for 24h, wash with deionized water for 3-5 times until the pH of the cleaning solution reaches 5~6, centrifuge to get the powder, and dry at 80°C for 12h Get powdered Ti 3 C 2 ;

[0044] figure 1 is Ti before and after HF acid stripping 3 AlC 2 and Ti 3 C 2 The XRD spectrum of the figure shows that the raw material Ti 3 AlC 2 The XRD pattern of the standard Ti 3 AlC 2 The matching degree of the spectrum is very high, and the raw material has very good crystallinity; compared with the XRD pattern before HF stripping, the crystallinity and structural order of the sample after HF acid treatment decreased significantly; after HF acid stripping, the Ti 3 C 2 The position of the main peak (002) in...

Embodiment 2

[0059] PL / Ti by hydrogen storage tester 3 C 2 / SnS / MF composite hydrogen storage material samples for hydrogen storage performance test, the mass of the sample used for each test is about 0.2g, during the programmed temperature desorption test, the sample is loaded into the reactor, and then connected to the hydrogen storage tester for pumping Vacuum for testing; from room temperature to 500°C at a rate of 2°C / min. During the constant temperature dehydrogenation test, after vacuuming, it is necessary to fill the reactor with 100bar H2 and quickly heat it to the specified temperature. After stabilization, the constant temperature hydrogen desorption performance test was carried out.

[0060] Figure 9 for PL / Ti 3 C 2 / SnS / MF composite hydrogen storage material TPD curve of temperature-programmed hydrogen desorption, from Figure 9 It can be seen that PL / Ti 3 C 2 / SnS / MF (a) and PL / SnS / MF (b) all exhibit a three-step dehydrogenation process, in which PL / Ti 3 C 2 / SnS / MF...

Embodiment 3

[0064] In order to examine PL / Ti 3 C 2 / SnS / MF composite hydrogen storage material hydrogen desorption reaction mechanism, for PL / Ti 3 C 2 The XRD and FTIR spectra of the / SnS / MF composite hydrogen storage material were tested at different temperatures, and the results are as follows Figure 12-13 shown by Figure 12 It can be seen that when the heating temperature reaches 100 °C, there is still LiBH 4 phase, and a new substance Li 3 BO 3 , indicating that at low temperature LiBH 4 React with PMMA to release a small amount of hydrogen, and Figure 9 Corresponding to the first dehydrogenation stage of the middle hydrogen desorption curve; continue to increase the temperature to 200 ° C, and observe LiBH in the XRD pattern 4 Decrease, there is a new substance LiB 5 o 8 appears, and Li 3 BO 3 still exists, indicating that LiBH 4 Further react with PMMA to release hydrogen; further increase the temperature to 300 ° C, almost no LiBH can be observed 4 phase (from Fi...

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Abstract

The invention provides a preparation method of a Ti3C2MXene composite hydrogen storage material. The preparation method comprises the following steps: step one, firstly stripping Ti3AlC2 through HF acid to form Ti3C2; step two, then obtaining Ti3C2 / SnS through a hydrothermal reaction and high-temperature activation treatment; and step three, synthesizing a Ti3C2 / SnS / MF composite material through an impregnation method, then using the Ti3C2 / SnS / MF composite material to adsorb a tetrahydrofuran solution of PMMA-LiBH4 so as to form a PL / Ti3C2 / SnS / MF composite material. The PL / Ti3C2 / SnS / MF composite material synthesized by the simple method has good hydrogen desorption performance and certain hydrophobicity, the initial hydrogen desorption temperature of the PL / Ti3C2 / SnS / MF composite materialis as low as 80 DEG C, the main hydrogen desorption temperature is 300 to 400 DEG C, the hydrogen desorption amount within 1 h at the temperature of 350 DEG C reaches 6.3wt%, and the hydrogen desorption performance of the PL / Ti3C2 / SnS / MF composite material is higher than the hydrogen desorption performance of a PL / SnS / MF composite material, so that the hydrogen desorption performance of PMMA-LiBH4is improved through the synergism of Ti3C2 and the PL / SnS / MF hydrogen storage composite material.

Description

technical field [0001] The invention relates to the technical field of hydrogen storage materials for new energy materials, in particular to a Ti 3 C 2 Preparation method of MXene composite hydrogen storage material. Background technique [0002] The development of safe and efficient storage and transportation technology is the key to the development of hydrogen economy. Solid hydrogen storage materials are considered to be ideal hydrogen storage materials because of their high safety and convenient storage. Among them, light metal complex hydrides are favored due to their high hydrogen storage capacity. Being widely concerned, lithium borohydride (LiBH 4 ) mass hydrogen storage density and volume hydrogen storage density are 18.5wt% and 121kg / m 3 , but there are still some shortcomings such as high hydrogen desorption temperature and poor reversibility, which seriously hinder its application as a hydrogen storage material. [0003] In order to improve the LiBH 4 The re...

Claims

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Application Information

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IPC IPC(8): C01B3/00
CPCC01B3/0078Y02E60/32
Inventor 申芳华谢春晓
Owner DONGGUAN UNIV OF TECH
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