Magnesium-based hydrogen storage alloy composite material with added metal sulfide

A magnesium-based hydrogen storage alloy and metal sulfide technology, which is applied in the field of magnesium-based hydrogen storage alloy composite materials, can solve the problems that the hydrogen desorption rate has not been significantly improved, the hydrogen desorption kinetics has not been significantly improved, and the kinetic performance is not ideal. , to achieve the effects of easy industrialization and promotion, easy operation and low cost

Inactive Publication Date: 2013-06-05
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent No. 200610118471.8 discloses a hydrogen storage alloy synthesized by ball milling a Li-based hydride and a magnesium-based alloy. Although the hydrogen absorption kinetics of pure magnesium is improved, its kinetic properties at low temperatures are still not ideal. No significant improvement in hydrogen dynamics
The literature Seon-Ah Jin, Jae-Hyeok Shim, Young Whan Cho, Kyung-Woo Yi. Journal of Power Sources, 172(2007) 859–862 proposed to add a series of The hydrogen absorption rate of the transition metal fluoride alloy obtained after ball milling has been improved, but the hydrogen desorption rate has not been significantly improved. At the same time, some transition metal fluorides such as NbF5 are expensive , so that the practical application is subject to certain restrictions

Method used

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  • Magnesium-based hydrogen storage alloy composite material with added metal sulfide
  • Magnesium-based hydrogen storage alloy composite material with added metal sulfide
  • Magnesium-based hydrogen storage alloy composite material with added metal sulfide

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Effect test

Embodiment 1

[0025] In an argon atmosphere, an appropriate amount of magnesium powder with a particle size of 100 mesh was weighed and placed in a hydrogenation reactor. The temperature was kept at 400 °C and a hydrogen pressure of 4 MPa for 1 h to convert it into MgH. 2 , naturally cooled to room temperature, taken out under the protection of argon atmosphere, and added to the hydrogenated MgH 2 MoS with a particle size of 100 mesh is added to the powder 2 The powder was mixed uniformly in a mass ratio of 10:1. The mixed powder was placed in a ball mill tank and ball milled under the protection of hydrogen atmosphere. The ball quality was stainless steel. The ball mill was a Pulverisette6 planetary ball mill. The rotation speed of the ball mill tank was 450 r / min , the mass ratio of ball to material is 29:1, the intermittent time is 15 min, and the ball milling time is 1 h. The magnesium-based hydrogen storage alloy composites prepared by ball milling were tested for hydrogen absorption ...

Embodiment 2

[0027] CeMg 3 The alloy was mechanically pulverized to 40 mesh under the protection of argon atmosphere, and an appropriate amount of powder was weighed and placed in a hydrogenation reactor, kept at 300 °C and 3 MPa hydrogen pressure for 1 h to convert it into CeH 3 and MgH 2 , cooled to room temperature naturally, and taken out under the protection of argon atmosphere. Under the protection of argon atmosphere, CoS with a particle size of 200 mesh was added to the hydrogenated magnesium-based alloy powder 2 The powder was mixed uniformly according to the mass ratio of 10:3. The mixed powder was placed in a ball mill tank and ball milled under the protection of hydrogen atmosphere. The ball quality was stainless steel. The ball mill was a Pulverisette6 planetary ball mill, and the speed of the ball mill tank was 550 r / min , the mass ratio of ball to material is 33:1, the intermittent time is 5 min, and the ball milling time is 3 h. The magnesium-based hydrogen storage alloy...

Embodiment 3

[0029] PrMg 3 The alloy was mechanically pulverized to 70 mesh under the protection of a hydrogen atmosphere, and an appropriate amount of powder was weighed and placed in a hydrogenation reactor. 3 and MgH 2 , cooled to room temperature naturally, and taken out under the protection of argon atmosphere. Under the protection of argon atmosphere, MoS with a particle size of 100 mesh was added to the hydrogenated magnesium-based alloy powder 2 The powder is mixed evenly according to the mass ratio of 5:1. The mixed powder is placed in a ball mill tank and ball milled under the protection of hydrogen atmosphere. The ball quality is stainless steel. The ball mill is a Pulverisette6 planetary ball mill, and the speed of the ball mill tank is 500 r / min. , the mass ratio of ball to material is 31:1, the intermittent time is 30 min, and the ball milling time is 2 h. The magnesium-based hydrogen storage alloy composites prepared by ball milling were tested for hydrogen absorption rat...

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Abstract

The invention relates to a magnesium-based hydrogen storage alloy composite material with metal sulfide added, which consists of a magnesium-based hydrogen storage alloy and the metal sulfide of which the mass is 10-30 percent of that of the magnesium-based hydrogen storage alloy, wherein the magnesium-based hydrogen storage alloy is Mg and REMg3 or RE2Mg17 (RE=La, Ce, Pr and Nd), the metal sulfide can be one of MoS2, CoS2 and CoS. A preparation method of the magnesium-based hydrogen storage alloy composite material with the metal sulfide added mainly comprises the following steps of: (1) enabling the magnesium-based hydrogen storage alloy to fully adsorb hydrogen in a hydrogenation reactor, and (2) performing ball milling under protection of hydrogen atmosphere. The hydrogen adsorption / releasing rate of the composite material prepared by the method is improved by over 1.5 times than that of the magnesium-based hydrogen storage alloy without adding the metal sulfide, and the initial dehydrogenation temperature of the composite material is reduced by 15-100K. The composite material is simple in preparation process and stable in performance, and can be applied to hydrogen storage and supplying in fields such as electromobiles and fuel cells.

Description

technical field [0001] The invention relates to a magnesium-based hydrogen storage alloy composite material. Background technique [0002] With the deterioration of the environment and the lack of energy, the development of environmentally friendly energy has become the focus of research in various countries. At present, hydrogen has become the most attractive new energy source due to its abundant resources, high energy density and environmental friendliness. Therefore, the use of hydrogen storage materials to store and transport hydrogen can be safe and efficient, and is considered to be one of the more ideal carriers. Practical hydrogen storage materials must meet the requirements of high hydrogen storage density, fast hydrogen absorption / desorption rate, moderate operating temperature and safety. Existing magnesium-based alloys as hydrogen storage and transport materials have been rapidly developed and extensively studied due to their advantages such as low density, lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/05
Inventor 韩树民张伟贾彦虹赵鑫
Owner YANSHAN UNIV
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