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Lithium-magnesium-nitrogen-hydrogen composite hydrogen storing material

A hydrogen storage material, nitrogen and hydrogen technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of slow hydrogen release rate, high hydrogen release temperature, difficult to meet practical application requirements, etc., and achieve faster hydrogen release rate and performance. excellent effect

Active Publication Date: 2011-04-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently developed lithium-magnesium-nitrogen-hydrogen composite hydrogen storage materials show good comprehensive performance at temperatures above 200°C, and the hydrogen desorption temperature is generally high, and the hydrogen desorption rate is slow, which is difficult to meet the requirements of practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In a glove box filled with Ar gas, Li 2 NH and MgNH were mixed with 0.01, 0.03, 0.05, 0.08, 0.1 and 0.15 moles of KH respectively, put into a sealable stainless steel tank, protected by argon, and ball milled on a planetary ball mill with a ball-to-material ratio of 60:1 , the speed is 500rpm. The samples after ball milling were first analyzed by FTIR. figure 1 Shown as Li 2 FTIR spectrum of NH-1.2MgNH-0.15KH sample. It can be seen from the figure that the sample is at 3010-3275cm after ball milling -1 In the range of wave numbers, there is an asymmetrical broad peak, and the peak wave number of the absorption peak is at 3169cm -1 or so, which is mainly determined by Li 2 It is caused by the superposition of NH and MgNH infrared absorption peaks. Subsequently, the samples after ball milling were tested for hydrogen absorption performance, the initial hydrogen pressure for hydrogen absorption was 100 atm, and the heating rate was 1°C / min. Table 1 lists the hydroge...

Embodiment 2

[0027] filled with N 2 In a glove box with gas, the molar ratios of Li 2 NH and MgNH with 0.02, 0.04, 0.06, 0.08, 0.1, 0.12 and 0.14 moles of K, respectively 2 O or KOH were mixed, put into a sealable stainless steel tank, protected by nitrogen, and ball milled on a vibrating ball mill with a ball-to-material ratio of 30:1. The obtained samples were first subjected to hydrogen absorption under the conditions of 80atm and 150°C, and then the hydrogen desorption performance test was performed on the hydrogen absorption samples. Table 2 lists the dehydrogenation starting temperature and dehydrogenation amount of the mixed samples after hydrogen absorption. It was found that the starting temperature of hydrogen desorption of all samples was below 100°C, and the hydrogen desorption amount was above 4wt%. image 3 Shows Li 2 Hydrogen desorption curve of NH-0.5MgNH-0.12KOH hydrogen absorption sample. It can be seen from the figure that the initial hydrogen desorption temperature...

Embodiment 3

[0032] In a glove box filled with Ar gas, Li 2 NH and MgNH are mixed with 0.1 and 0.15 moles of KF and KI, respectively, and put into a ball mill tank with a switch valve. After the ball mill tank is pre-evacuated, the ball mill is mixed on a planetary ball mill, and the ball-to-material ratio is 80:1. , the speed is 300rpm. The obtained samples are first subjected to hydrogen absorption under the conditions of 90atm and 180°C, and the hydrogen absorption samples are then subjected to a hydrogen desorption performance test. Table 3 lists the dehydrogenation temperature and dehydrogenation amount of all the above samples after hydrogen absorption. It was found that the initial hydrogen desorption temperature of all samples was below 100° C., and the total hydrogen desorption amount was between 4-5 wt%. Figure 4 Shown as Li 2 Hydrogen desorption curve of NH-0.75MgNH-0.1KF hydrogen absorption sample. Obviously, the initial hydrogen desorption temperature of the sample is about...

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Abstract

The invention discloses a lithium-magnesium-nitrogen-hydrogen composite hydrogen storing material. A component of the lithium-magnesium-nitrogen-hydrogen composite hydrogen storing material is Li2NH-aMgNH-bKnX, wherein X is H, O, OH, a halogen ion and an acid radical ion; a is larger than or equal to 0.5 and smaller than or equal to 1.5; b is larger than or equal to 0.01 and smaller than or equal to 0.15; and n is a valence state of X. A preparation method of the lithium-magnesium-nitrogen-hydrogen composite hydrogen storing material comprises the following steps of: charging potassium compound KnX and a mixture of Li2NH and MgNH into a stainless steel tank; and uniformly mixing the mixture in a mechanical mixing way in a vacuum or inert atmosphere. The lithium-magnesium-nitrogen-hydrogen composite hydrogen storing material of the invention has the advantages of more than 5 percent by weight of hydrogen storing capacity, low hydrogen sucking and releasing temperature, hydrogen releasing initial temperature of 70 DEG C or so and high hydrogen releasing speed, can release more than 4.0 percent by weight of hydrogen in 30 minutes under the condition of 150 DEG C and is the hydrogen storing material with favorable performance.

Description

technical field [0001] The invention relates to a hydrogen storage material for a fuel cell, in particular to a lithium-magnesium-nitrogen-hydrogen composite hydrogen storage material. Background technique [0002] With the rapid development of society and economy, human's demand for energy continues to increase, leading to the depletion of non-renewable energy sources such as fossil fuels, and the energy crisis is becoming more and more serious. On the other hand, the extensive use of fossil fuels has also aggravated environmental pollution and seriously threatened the living environment of human beings. Therefore, in order to realize the sustainable development of human society, research and development of various new green and renewable energy sources has become a consensus, especially in today's low-carbon and zero-carbon economic development. Hydrogen is known as a green energy carrier in the 21st century due to its abundant reserves, high combustion efficiency and no ...

Claims

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Application Information

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IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 刘永锋李超潘洪革高明霞
Owner ZHEJIANG UNIV
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