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Composite hydrogen storage material NaBH4@NiB-CNC and preparation method thereof

A hydrogen storage material, sodium borohydride technology, applied in chemical instruments and methods, hydrogen, boron/boride, etc., can solve the problem of poor kinetic performance of hydrogen absorption and desorption, poor kinetic performance of hydrogen desorption, high thermodynamic stability, etc. problems, to achieve the effect of low price, low equipment requirements, and convenient synthesis

Active Publication Date: 2022-01-28
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its disadvantages such as high thermodynamic stability, high hydrogen desorption temperature, poor hydrogen desorption kinetics, and poor cycle hydrogen absorption and desorption kinetics hinder its practical application as a vehicle-mounted hydrogen storage material [4]

Method used

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  • Composite hydrogen storage material NaBH4@NiB-CNC and preparation method thereof
  • Composite hydrogen storage material NaBH4@NiB-CNC and preparation method thereof
  • Composite hydrogen storage material NaBH4@NiB-CNC and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of NiB-CNC

[0039] At room temperature (25° C.), weigh 60 mg of carbon nanocages in 40 mL of deionized water, and disperse ultrasonically for 10 min to disperse the carbon nanocages evenly in deionized water. 84 mg of nickel nitrate hexahydrate was added thereto, followed by stirring for 10 minutes. Dissolve 0.4 mmol sodium borohydride in 20 mL deionized water. Add the sodium borohydride solution drop by drop into the nickel nitrate solution with nano-carbon cages under stirring state. Continue to stir for 30 min after the dropwise addition. The reacted product was centrifuged and washed three times with deionized water, and dried in vacuum at 60°C for 12 hours, and the obtained black powder was NiB-CNC.

[0040] (2)NaBH 4 50 wt% NaBH loading 4 Preparation of @NiB-CNC

[0041] In an argon glove box, 100 mg NaBH 4 Added to 50mL of ethylene glycol dimethyl ether, stirred for 1h to obtain a transparent and clear solution. After adding 100mg of NiB-...

Embodiment 2

[0044] The same method as step (1) in Example 1 was used to prepare nano-carbon cage NiB-CNC with NiB catalyst. In an argon glove box, 40 mg NaBH 4 Added to 20mL of ethylene glycol dimethyl ether, stirred for 1h to obtain a transparent and clear solution. After adding 20mg of NiB-CNC to it, continue to sonicate in the ultrasonic machine for 0.5h, transfer the sonicated product to the reaction tube, drain the solvent at 80°C and continue to vacuum for 12h, the obtained product is NaBH 4 67 wt% NaBH loading 4 @NiCo-NC, that's 67% NaBH 4 @NiCo-NC. Such as Image 6 As shown, the prepared 67% NaBH 4 @NiCo-NC can emit 7.3wt% (relative to NaBH 4 quality) of hydrogen, much higher than ball milled NaBH 4 The amount of hydrogen released (0.5wt%).

Embodiment 3

[0046] The same method as step (1) in Example 1 was used to prepare nano-carbon cage NiB-CNC with NiB catalyst. In an argon glove box, 60 mg NaBH 4 Added to 30mL ethylene glycol dimethyl ether, stirred for 1h to obtain a transparent and clear solution. After adding 20mg of NiB-CNC to it, continue to sonicate in the ultrasonic machine for 0.5h, transfer the sonicated product to the reaction tube, drain the solvent at 80°C and continue to vacuum for 12h, the obtained product is NaBH 4 75 wt% NaBH loading 4 @NiCo-NC, that is 75% NaBH 4 @NiCo-NC. Such as Image 6 As shown, the prepared NaBH with 75wt% loading 4 @NiCo-NC can emit 7.3wt% (relative to NaBH 4 quality) of hydrogen, much higher than ball milled NaBH 4 The amount of hydrogen released (0.7wt%).

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Abstract

The invention discloses a composite hydrogen storage material NaBH4@NiB-CNC and a preparation method thereof. The method comprises the following steps: preparing a NiB-CNC template material; and preparing the NaBH4@NiB-CNC, wherein the content of the catalyst NiB in the NiB-CNC template material is controlled by controlling the adding amount of the Ni source and NaBH4 in the chemical reduction process, the loading capacity of the hydrogen storage material NaBH4 is 30-75 wt%, and the mass fraction of the template material NiB-CNC is 70-25 wt%. According to the method disclosed by the invention, the NaBH4 in the composite material can realize complete hydrogen desorption at the temperature of below 400 DEG C, and the hydrogen desorption dynamic performance is obviously improved; the prepared material has excellent hydrogen storage performance; and the process is simple and easy to operate, convenient to synthesize and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage materials, in particular to a composite hydrogen storage material NaBH 4 @NiB-CNC and its preparation method. Background technique [0002] The storage of hydrogen is an intermediate link between the preparation and application of hydrogen. The safe and efficient storage of hydrogen is the key to the practical application of hydrogen energy technology. premise. Compared with traditional high-pressure hydrogen storage and low-temperature liquid hydrogen storage, solid-state hydrogen storage has the advantages of high hydrogen storage density, good safety, and relatively low cost, and is the most likely hydrogen storage method for practical application [1]. [0003] Among solid-state hydrogen storage materials, metal complex hydrides are regarded as one of the most potential hydrogen storage materials due to their high gravimetric and volumetric hydrogen storage densities [2]. NaBH 4 It...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/00C01B32/15C01B35/04C01B6/21B01J23/755
CPCC01B3/0078C01B32/15C01B35/04C01B6/21B01J23/755Y02E60/32
Inventor 余学斌陈伟夏广林
Owner FUDAN UNIV
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