A nano-magnesium-based reversible hydrogen storage composite material and its preparation method

A composite material and nano-magnesium technology, which is applied in the field of nano-magnesium-based reversible hydrogen storage composite materials and its preparation, can solve the problems of poor hydrogen absorption and desorption kinetics, high hydrogen-discharging temperature of magnesium-based hydrogen storage materials, and achieve difficult reunion and improved reversibility The effect of hydrogen storage performance and good activation performance

Active Publication Date: 2017-08-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a nano-magnesium-based reversible hydrogen storage composite material, which mainly solves the problems of high hydrogen desorption temperature and poor hydrogen absorption and desorption power of magnesium-based hydrogen storage materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First, 215.2mg Fe(NO 3 ) 3 9H 2 O and 76.3mg of citric acid were dissolved in 30mL of deionized water and stirred evenly, and then 83.5mg of graphite powder was gradually added to the above solution and continued to stir for 10min and ultrasonic oscillation for 5min to obtain a mixed solution; then the above mixed solution was placed in a vacuum drying oven , and evacuated at room temperature 25°C for 2h, and further evacuated at 110°C for 10h to obtain a solid mixed powder; 2 and 90vol.%N 2 N 2 -H 2 Mixed gas (nitrogen-hydrogen gas mixture is composed of 10% hydrogen by volume and 90% nitrogen by volume) for reduction treatment at a treatment temperature of 380°C; finally vacuum-dried at 70°C to obtain a Fe load containing about 50wt.% Fe@C catalyst, in which Fe particles with a particle size of about 6 nm are uniformly distributed around the graphite matrix.

[0029] Under the conditions of room temperature 25°C and inert gas (argon), the particle size of Mg pow...

Embodiment 2

[0032] First, 178.8mg Co(NO 3 ) 2 ·6H 2 O and 60.7mg of citric acid were dissolved in 30mL of deionized water and stirred evenly, and then 120.7mg of activated carbon was gradually added to the above solution and continued to stir for 10min and ultrasonic oscillation for 5min to obtain a mixed solution; then the above mixed solution was placed in a vacuum oven , and evacuated at room temperature 25°C for 2h, and further evacuated at 110°C for 10h to obtain a solid mixed powder; 2 N 2 -H 2 Mixed gas for reduction treatment, the treatment temperature is 380 °C; finally vacuum drying at 70 °C to obtain a Co@C catalyst containing about 30wt.% Co loading, in which Co particles with a particle size of about 8 nm are evenly distributed around the activated carbon matrix .

[0033] Under the conditions of room temperature 25°C and inert gas (argon), the particle size of Mg powder and Al powder is 74-154 μm, and the purity of Mg powder and Al powder is 99% according to Mg 17 al ...

Embodiment 3

[0036] First, 185.8mg Ni(NO 3 ) 2 ·6H 2 O and 65.3mg of citric acid were dissolved in 30mL of deionized water and stirred evenly, and then 187.5mg of multi-walled carbon nanotubes were gradually added to the above solution and continued to stir for 10min and ultrasonic oscillation for 5min to obtain a mixed solution; then the above mixed solution was placed in In a vacuum drying oven, vacuumize at room temperature 25°C for 2h, and further vacuumize at 110°C for 10h to obtain a solid mixed powder; 2 N 2 -H 2 The mixed gas is subjected to reduction treatment at a temperature of 380°C; finally, it is vacuum dried at 70°C to obtain a Ni@C catalyst containing about 20 wt. Nanotube substrate surface.

[0037] Under the conditions of room temperature 25°C and inert gas (argon), the particle size of Mg powder and Al powder is 74-154 μm, and the purity of Mg powder and Al powder is 99% according to Mg 17 al 12 The stoichiometric ratio of the alloy is mixed to obtain Mg 17 al 1...

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Abstract

The invention discloses a nanometer magnesium base reversible hydrogen storage composite material and a preparation method thereof. The nanometer magnesium base reversible hydrogen storage composite material is prepared by 80-95 weight% of magnesium-aluminum alloy Mg17Al12 and 5-20 weight% of carbon-loaded transition metal catalyst; the carbon-loaded transition metal catalyst consists of basal material carbon and transition metal; the basal material carbon is one of graphite powder, graphite fiber, activated carbon, single-wall carbon nanotube and multi-wall carbon nanotube; and the transition metal is one of Fe, Co, Ni and Nb. The preparation method comprises the following steps: the magnesium-aluminum alloy Mg17Al12 and the carbon-loaded transition metal catalyst are uniformly mixed to perform the ball milling in the inert atmosphere to obtain the nanometer magnesium base reversible hydrogen storage composite material. The magnesium base reversible hydrogen storage composite material has such advantages as low effective hydrogen storage temperature and excellent hydrogen absorption / desorption dynamics performance, can be applied to purification, storage and transportation of hydrogen, and in particular, can serve as a hydrogen source alloy of medium / low-temperature fuel cells.

Description

technical field [0001] The invention relates to the field of metal hydrogen storage materials, in particular to a nano-magnesium-based reversible hydrogen storage composite material and a preparation method thereof. Background technique [0002] Hydrogen is the most ubiquitous element in nature, inexhaustible and inexhaustible; at the same time, it has excellent energy conversion performance and can be flexibly and efficiently converted into other forms of energy. The development and utilization of hydrogen energy can effectively alleviate the shortage of fossil energy and environmental pollution. The use of metal hydrides to store hydrogen is a safe and very high specific volume hydrogen storage method, which plays an irreplaceable role in the field of secondary energy, especially in fuel cell applications. Many metals, intermetallic compounds or alloys can undergo hydrogenation reactions with hydrogen at a certain temperature and hydrogen pressure to form binary, ternary ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C1/10C22C23/02
CPCC22C1/1084C22C23/02
Inventor 陈立新翁成才肖学章李露李寿权葛红卫
Owner ZHEJIANG UNIV
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