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Doped Li-Mg-N-H hydrogen storage material

A hydrogen storage material, 2-xlih-yrbnm technology, applied in various metal hydrides, fuel cells, hydrogen production and other directions, can solve the problems of high hydrogen release temperature and slow hydrogen release rate, and achieve high hydrogen storage capacity. , The effect of fast hydrogen release and accelerated hydrogen release

Inactive Publication Date: 2011-08-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently developed Li-Mg-N-H hydrogen storage materials still have the disadvantages of high dehydrogenation temperature and slow hydrogen desorption rate. The rapid dehydrogenation temperature is above 180°C, which cannot meet the requirements of practical applications.

Method used

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  • Doped Li-Mg-N-H hydrogen storage material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In a glove box filled with Ar gas, Mg(NH 2 ) 2 and LiH are mixed with 0.01, 0.03, 0.05, 0.08, 0.1, 0.12 and 0.15 moles of RbH respectively, and put into a sealable stainless steel tank. Ball milling was carried out on a ball mill with a ball-to-material ratio of 50:1 and a rotational speed of 500 rpm. The samples after ball milling were tested for hydrogen desorption performance. Table 1 lists the starting temperature and amount of hydrogen desorption of the above mixed samples. From the data in the table, it can be seen that the hydrogen release amount of all the above samples is above 4.0 wt%, and the hydrogen release start temperature is about 60-110°C.

[0020] Table 1 Mg(NH 2 ) 2 -2LiH-yRbH sample hydrogen release start temperature and hydrogen release amount

[0021] sample

[0022] Mg(NH 2 ) 2 -2LiH-0.12RbH

Embodiment 2

[0027] In a glove box filled with N2 gas, Mg(NH 2 ) 2 and LiH were mixed with 0.05 moles of RbF, RbCl, RbBr and RbI respectively, put into a sealable stainless steel tank, protected by nitrogen, and ball milled on a planetary ball mill with a ball-to-material ratio of 80:1 and a speed of 450rpm. The samples obtained after ball milling were tested for dehydrogenation. Table 2 lists the hydrogen desorption properties of the above mixed samples. It can be seen from Table 2 that the hydrogen desorption of all samples can be carried out below 100°C, and the hydrogen desorption amount is above 4.0wt%. The isothermal dehydrogenation test found that all the samples could release more than 3.0wt% hydrogen within 40 minutes at 150°C.

[0028] figure 2 Shown as Mg(NH 2 ) 2 -3LiH-0.05RbF sample isothermal dehydrogenation curve. The results showed that Mg(NH 2 ) 2 The -3LiH-0.05RbF sample can achieve a hydrogen desorption capacity of more than 3.5wt% within 40min.

[0029] Table ...

Embodiment 3

[0032] In a glove box filled with Ar gas, Mg(NH 2 ) 2and LiH are mixed with 0.02, 0.04, 0.06, 0.08, 0.1, 0.12, 0.15 moles of RbOH respectively, put into a sealable stainless steel tank, and then vacuumize the ball mill tank for vacuum protection. Ball milling was performed on a planetary ball mill with a ball-to-material ratio of 90:1 and a rotational speed of 350 rpm. The mixture obtained by ball milling was first tested for dehydrogenation. Table 3 lists the hydrogen desorption performance data of the above mixed samples. As a result, it was found that the initial dehydrogenation temperature of the above-mentioned mixed samples was all below 110° C., and the hydrogen desorption amount remained above 4.0 wt%. The samples after dehydrogenation were further tested for hydrogen absorption performance. The initial hydrogen pressure of hydrogen absorption was 100 atm, and the initial hydrogen absorption temperature of all samples after dehydrogenation was lower than 80°C. ima...

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Abstract

The invention discloses a doped Li-Mg-N-H hydrogen storage material. The component of the Li-Mg-N-H hydrogen storage material is Mg(NH2)2-xLiH-yRbnM, wherein M is F, Cl, Br, I, H, O, OH or an acid radical ion, and n is the valence state of M; x is more than or equal to 2 and less than or equal to 4, and y is more than or equal to 0.01 and less than or equal to 0.15. The doped Li-Mg-N-H hydrogen storage material is prepared by uniformly mixing a mixture of RbnM, Mg(NH2)2 and LiH in a stainless steel pot under the condition of vacuum, hydrogen or inert gas by a mechanical mixing mode. The doped Li-Mg-N-H hydrogen storage material has the advantages of high hydrogen storage amount, proper working temperature, high hydrogen absorption ordesorption speed and the like, and has high performance.

Description

technical field [0001] The invention relates to a hydrogen storage material for a fuel cell, in particular to a doped Li-Mg-N-H hydrogen storage material. Background technique [0002] Energy and the environment are two major problems facing the development of human society. Hydrogen energy is known as the green new energy in the 21st century. The development and utilization of hydrogen energy involves technologies such as the preparation, storage, transportation and application of hydrogen, especially the storage technology of hydrogen has become the key to the practical and large-scale utilization of hydrogen energy. Material-based solid-state hydrogen storage technology is considered to be the most promising hydrogen storage method due to its high hydrogen storage energy density and good safety. Therefore, the research and development of various new hydrogen storage materials has always been an important topic in the field of hydrogen storage materials research at home a...

Claims

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Application Information

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IPC IPC(8): H01M8/06C01B3/02C01B6/24H01M8/0606
CPCY02E60/50
Inventor 刘永锋李超潘洪革高明霞
Owner ZHEJIANG UNIV
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