Nano magnesium hydride loaded composite material and preparation method thereof

A composite material, a technology of magnesium hydride, which is applied in the field of nano-magnesium hydride-loaded composite materials and its preparation, can solve the problems of hydrogen storage capacity and hydrogen absorption and desorption kinetic performance deterioration, free surface loss, interlayer stacking and other problems, and achieves good performance. Hydrogen absorption and desorption kinetic performance, accelerated hydrogen absorption and desorption rate, high chemical and physical stability

Active Publication Date: 2021-12-24
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the van der Waals force between the two-dimensional transition metal carbide (MXenes) nanosheets, it is prone to serious interlayer stacking phenomenon, resulting in a large loss of free surface for anchoring nano-magnesium hydride.
In addition, a large number of oxygen-containing functional groups on the surface of MXenes will cause serious oxidation of magnesium hydride / magnesium hydride during hydrogen absorption and desorption at high temperature, resulting in deterioration of hydrogen storage capacity and hydrogen absorption and desorption kinetics.
Based on the above reasons, there are no related reports on the use of two-dimensional transition metal carbides as supporting materials for magnesium-based hydrogen storage materials.

Method used

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  • Nano magnesium hydride loaded composite material and preparation method thereof
  • Nano magnesium hydride loaded composite material and preparation method thereof
  • Nano magnesium hydride loaded composite material and preparation method thereof

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preparation example Construction

[0041] A preparation method of a composite material loaded with nano-magnesium hydride, comprising the following steps:

[0042] Step (1), adding a cationic surfactant to the aqueous dispersion of the two-dimensional transition metal carbide to wrinkle and agglomerate the two-dimensional transition metal carbide nanosheets, followed by washing and drying;

[0043] Step (2), put the product obtained in step (1) into a sealed container, evacuate the sealed container to a vacuum, then raise the temperature to 600-1000°C, keep it warm for 2-5 hours, and then fill the sealed container with 1-10MPa High-pressure hydrogen and heat preservation for 2 to 5 hours;

[0044] Step (3), adding the product obtained in step (2) and dibutylmagnesium into an organic solvent to obtain a mixture, and ultrasonically dispersing the mixture, and then in a hydrogen pressure of 3 to 6MPa and a temperature of 180 to 220°C Under the condition, stir and heat for 12-48 hours, centrifuge and dry to obtain...

Embodiment 1

[0054] Two-dimensional transition metal carbide supported nano-magnesium hydride composite material 60MgH 2 Preparation of @Ti-MX1:

[0055] (1) Get 5g cetyltrimethylammonium bromide (CTAB) and dissolve in 100ml deionized water;

[0056] (2) The CTAB solution prepared in step (1) was added dropwise to 500ml of Ti with a concentration of 2mg / ml under agitation. 3 C 2 T x In the aqueous dispersion, the reaction product was centrifuged and washed 3 times, and the centrifuged product was freeze-dried for 72 hours;

[0057] (3) Put the product obtained in step (2) into a sealed stainless steel container. After the sealed stainless steel container is continuously evacuated, it is heated to 800° C. at a heating rate of 5° C. / min, and then filled with 3 MPa of hydrogen after holding for 2 hours. Insulate for 2 hours, and finally cool down to room temperature with the furnace, and the product is denoted as Ti-MX1;

[0058] (4) Take 30mg of Ti-MX1, 3.5ml of dibutylmagnesium heptane...

Embodiment 2

[0066] Two-dimensional transition metal carbide supported nano-magnesium hydride composite material 35MgH 2 Preparation of @Ti-MX2:

[0067] (1) Get 5g cetyltrimethylammonium bromide (CTAB) and dissolve in 100ml deionized water;

[0068] (2) The CTAB solution prepared in step (1) was added dropwise to 500ml of Ti with a concentration of 2mg / ml under agitation. 3 C 2 T x In the aqueous dispersion, the reaction product was centrifuged and washed 3 times, and the centrifuged product was freeze-dried for 72 hours;

[0069] (3) Put the product obtained in step (2) into a sealed stainless steel container, and after continuously vacuuming the sealed stainless steel container, heat it to 600°C at a heating rate of 5°C / min, keep it warm for 5h, then fill it with 3MPa hydrogen, keep it warm 5h, finally cooled to room temperature with the furnace, and the product was denoted as Ti-MX2;

[0070] (4) Take 30mg of Ti-MX2, 1.3ml of dibutylmagnesium heptane solution with a concentration ...

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Abstract

The invention discloses a preparation method of a nano magnesium hydride loaded composite material, the preparation method comprises the following steps: adding a cationic surfactant into an aqueous dispersion of two-dimensional transition metal carbide to enable two-dimensional transition metal carbide nanosheets to wrinkle and avoid re-stacking, and then washing and drying; putting the dried product into a sealed container, vacuumizing the sealed container, raising the temperature to a high temperature, keeping the temperature for a period of time, filling high-pressure hydrogen into the sealed container, and keeping the temperature for a period of time; and finally, adding a product subjected to heat treatment and dibutyl magnesium into an organic solvent to obtain a mixture, carrying out ultrasonic dispersion, stirring and heating for 12-48 hours under the conditions that the hydrogen pressure is 3-6 MPa and the temperature is 180-220 DEG C, and carrying out centrifugal drying to obtain the nano magnesium hydride loaded composite material. The prepared two-dimensional transition metal carbide nano magnesium hydride loaded composite material has the advantages of high hydrogen storage density, rapid hydrogen absorption and desorption dynamic performance, excellent cycle stability and the like.

Description

technical field [0001] The invention relates to the field of solid hydrogen storage materials, in particular to a composite material loaded with nanometer magnesium hydride and a preparation method thereof. Background technique [0002] Magnesium-based solid-state hydrogen storage materials have the advantages of high hydrogen storage density, strong cycle reversibility, and abundant earth reserves, and are considered to be the most promising solid-state hydrogen storage materials. However, the hydrogen absorption and desorption thermodynamic properties of magnesium-based hydrogen storage materials are too stable (the standard hydrogen absorption and desorption reaction enthalpy is ±75kJ / mol). Generally, pure magnesium hydride needs to be above 350°C to achieve hydrogen desorption. The performance of hydrogen dynamics is also poor, which greatly limits the practical application of magnesium-based hydrogen storage materials. At present, size nanosizing is considered to be on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/00
CPCC01B3/0078Y02E60/32
Inventor 邹建新朱文任莉
Owner SHANGHAI JIAO TONG UNIV
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