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A kind of low-temperature dehydrogenation magnesium-based composite material and its preparation method

A composite material and dehydrogenation technology, applied in the field of battery materials, can solve the problems of reduced thermal stability, no change in thermodynamic properties, weakened apparent activation energy, etc., to achieve improved low-temperature dehydrogenation performance, suitable thermal stability, and reduced The effect of thermodynamic stability

Active Publication Date: 2016-10-26
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these additives are only for MgH 2 The apparent activation energy of the material is weakened, but the intrinsic thermodynamic properties of the material are not changed
Because there is no change in the reaction path of the material, there is no change in the enthalpy change of dehydrogenation, and there is no substantial decrease in thermal stability

Method used

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  • A kind of low-temperature dehydrogenation magnesium-based composite material and its preparation method
  • A kind of low-temperature dehydrogenation magnesium-based composite material and its preparation method
  • A kind of low-temperature dehydrogenation magnesium-based composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In a glove box filled with argon, the molar ratio of 2:1 MgH 2 -TiH 2 Mix, then add Pd with a mole fraction of 0.5% and mix thoroughly, put it into a ball mill tank with an on-off valve, pre-evacuate the ball mill tank, and then ball mill and mix on a planetary wheel ball mill with a ball-to-material ratio of 90:1 and a speed of 400rpm, ball milling time is 5 hours.

[0022] Among them, MgH 2 The purity is 95%, the particle size is 300 mesh; TiH 2 The purity is 99.5%, and the particle size is 200 mesh; the purity of Pd powder is 99.9%, and the particle size is 300 mesh.

[0023] figure 1 for MgH 2 -TiH 2 - X-ray diffraction spectrum of Pd material mixed milled for 5 hours, showing that MgH 2 and TiH 2 For mechanical mixing, there is no reaction between the two during ball milling, and a small amount of Pd is hydrogenated to form PdH during ball milling. 2 .

[0024] Test the hydrogen absorption and desorption performance of the sample: In a glove box filled wi...

Embodiment 2

[0027] In a glove box filled with argon, the molar ratio of 2:1 MgH 2 -TiH 2 Mix, then add Pd with a mole fraction of 3% and mix thoroughly, put it into a ball mill tank with a switch valve, pre-vacuumize the ball mill tank, and ball mill and mix on a planetary wheel ball mill, the ball-to-material ratio is 90:1, and the speed 400rpm, ball milling time is 10 hours.

[0028] Figure 4 for MgH 2 -TiH 2 - X-ray diffraction spectrum of Pd material mixed milled for 10 hours, showing that MgH 2 and TiH 2 For mechanical mixing, there is no reaction between the two during ball milling, and a small amount of Pd is hydrogenated to form PdH during ball milling. 2 . Test the hydrogen absorption and desorption performance of the sample: In a glove box filled with argon, take out the sample prepared by the ball mill and weigh it, put it into a specific sample cell of the Sievert type gas-solid reaction test equipment, and seal it. Take out the sample cell and connect it tightly with...

Embodiment 3

[0030] In a glove box filled with argon, the molar ratio of 2:1 MgH 2 -TiH 2 Mix, then add Pd with a molar ratio of 3% and mix thoroughly, put it into a ball mill tank with a switch valve, pre-vacuumize the ball mill tank, and then ball mill and mix on a planetary wheel ball mill with a ball-to-material ratio of 80:1 and a speed of 300rpm, ball milling time is 15 hours.

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Abstract

The invention provides a magnesium-based composite material having low-temperature dehydrogenation activity. The composite material is a Pd-doped xMgH2-TiH2 compound, wherein x is 1-8 and the mole fraction of the Pd dopant is 0.1-1%. The invention also provides a preparation method of the magnesium-based composite material having low-temperature dehydrogenation activity. The preparation method of the composite material is simple and low in cost; by adding Pd, the pathway for dehydrogenation reaction of the system is improved, the composite material has the advantages of suitable thermal stability high capacity and high dehydrogenation activity and has the characteristics of hydrogen release operating temperature suitable for an FC work, high hydrogen release rate and the like.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a magnesium-based composite material capable of low-temperature dehydrogenation, and also relates to a preparation method of the magnesium-based composite material capable of low-temperature dehydrogenation. Background technique [0002] The fossil energy on the earth is depleting day by day, and the ecological environment continues to deteriorate. It has become the consensus of all mankind to search for renewable and clean energy. As an efficient and clean energy carrier, hydrogen is one of the energy alternatives with great potential. [0003] The production, storage, and application of hydrogen gas in fuel cells constitute three important links in the recycling of hydrogen energy. However, the storage of hydrogen as an intermediate link is currently facing many problems (kinetic performance, thermal stability, reversibility of hydrogen absorption and desorption, c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/05B22F9/04
CPCB22F9/04C22C1/05C22C23/00
Inventor 张耀
Owner SOUTHEAST UNIV
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