Mg-based composite hydrogen storage material containing alkaline earth metals-aluminum hydride and preparation method thereof

A technology of hydrogen storage materials and aluminum hydrides, which is applied in the field of hydrogen storage materials to achieve the effects of high hydrogen absorption and desorption cycle stability, high hydrogen storage capacity, and good low-temperature hydrogen absorption kinetic performance

Inactive Publication Date: 2009-10-07
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Claims
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Problems solved by technology

However, the simultaneous addition of alkaline earth metal-aluminum hydride and transition metal halides to magnesium-based hydrogen storage alloys to prepare magnesium-based composite hydrogen storage materials has not been reported.

Method used

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  • Mg-based composite hydrogen storage material containing alkaline earth metals-aluminum hydride and preparation method thereof

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Embodiment

[0017] Example: According to MgH 2 +30wt.% (Sr 0.8 Ca 0.2 ) 2 H 7 +5wt.%TiF 3 The design composition, accurately weigh MgH 2 , (Sr 0.8 Ca 0.2 ) 2 H 7 and TiF 3 The three raw material powders are poured into a stainless steel ball mill tank with a volume of 250ml and mixed. At the same time, stainless steel balls with a diameter of 10mm are put into the ball mill tank, and the ball-to-material ratio is 20:1; After argon cleaning was repeated 3 times, 0.5MPa hydrogen was filled as a protective atmosphere, and the mixed powder was mechanically milled with a planetary ball mill at a milling speed of 400 rpm and a milling time of 10 hours. The X-ray diffraction pattern of the composite hydrogen storage material obtained after ball milling is as follows: figure 1 As shown, it can be seen that the composite hydrogen storage material is mainly composed of MgH 2 , (Sr, Ca) 2 H 7 and TiF 3 Composed of three phases.

[0018] Under the initial hydrogen pressure of 1 MPa an...

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Abstract

The invention provides an Mg-based composite hydrogen storage material containing alkaline earth metals-aluminum hydride and a preparation method thereof, which belongs to the technical field of hydrogen storage material. The chemical general formula of the hydrogen storage material is MgH2+x wt.%(Sr1-yCay)2AlH7+z wt.%TiF3, wherein x is more than or equal to 30 and less than or equal to 50, y is more than or equal to 0 and less than or equal to 0.5, and z is more than or equal to 2 and less than or equal to 10. The hydrogen storage material is gained by mechanically ball milling three materials powder of MgH2, (Sr, Ca)2AlH7 and TiF3, a planetary ball mill is adopted when ball milling, the ball material ratio is 15:1 to 20:1, the rotational speed is 350 to 400rpm, the ball milling time is 10 to 20h, the ball milling protecting atmosphere is argon gas or hydrogen gas, and the atmosphere pressure is 1 to 5atm. The invention has the advantages that: the preparation technique is simple, the provided composite hydrogen storage materials do not need to be activated, and have high hydrogen storage capacity, simultaneously have good low temperature hydrogen absorption dynamic performance and high hydrogen absorption and desorption cycling stability. The invention is applicable to the safe and efficient storage and transportation of the hydrogen, especially the hydrogen fuel cells and other fields.

Description

Technical field: [0001] The invention belongs to the technical field of hydrogen storage materials, and in particular relates to a magnesium-based composite hydrogen storage material containing alkaline earth metal-aluminum hydride and a preparation method thereof. Background technique: [0002] With the continuous growth of world economy and population, fossil energy sources such as coal, oil and natural gas are increasingly exhausted. At the same time, the use of these traditional energy sources has caused extremely serious environmental pollution. Humans urgently need to seek and develop renewable, Clean new energy. In new energy systems such as solar energy, nuclear energy, wind energy, and biomass energy, hydrogen energy is considered to be an ideal secondary energy source for human beings in the future due to its advantages such as cleanness, wide range of sources, high calorific value, and multiple utilization methods, and it has also become a competition among countr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02
Inventor 张庆安柳东明斯庭智
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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