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Composite hydrogen storage material NaBH4@NiCo-NC and preparation method thereof

A hydrogen storage material, 2·6H2O technology, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve the problem of high hydrogen desorption temperature, and achieve the effects of low hydrogen desorption temperature, convenient synthesis, and low equipment requirements

Active Publication Date: 2021-09-03
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chong et al prepared NaBH by the method of graphene coating 4 @G nanomaterials, the initial hydrogen release temperature of the material dropped to only 40°C, and the composite material can release 7.0 wt% hydrogen during the step-by-step temperature rise to 460°C, and this part of the hydrogen storage capacity is completely reversible, but the The hydrogen desorption temperature is still relatively high in practical applications[7]

Method used

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  • Composite hydrogen storage material NaBH4@NiCo-NC and preparation method thereof
  • Composite hydrogen storage material NaBH4@NiCo-NC and preparation method thereof
  • Composite hydrogen storage material NaBH4@NiCo-NC and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of flake NiCo-MOFs

[0039] At room temperature (25°C), 0.75 mmol Ni(NO 3 ) 2 ·6H 2 O, 0.75 mmol Co(NO 3 ) 2 ·6H 2 O and 1.5 mmol terephthalic acid were dissolved in a mixed solution consisting of 4 mL ethanol, 4 mL water, and 64 mL N,N dimethylformamide. To it was quickly added 1.6 mL of triethylamine and stirred for 5 minutes. The product was placed in an ultrasonic machine, and the ultrasonic wave was continued for 8 h. After centrifuging three times with ethanol, the product was dispersed in water and sonicated for 30 minutes. The dispersed product was freeze-dried for 72 h, and the final product was NiCo-MOFs nanosheet material.

[0040] (2) Preparation of NiCo-NC porous nanosheets

[0041] The freeze-dried NiCo-MOFs were placed in a tube furnace. Under an argon atmosphere, the temperature was raised to 900 °C at a rate of 2 °C / min, kept for 1 h, and the product obtained after cooling was NiCo-NC.

[0042] (3) NaBH with 50% load 4 Prepara...

Embodiment 2

[0046] Prepare NiCo-NC porous nanosheets by the same method as step (1) and step (2) in Example 1, in an argon glove box, 30 mg NaBH 4 It was added to 15 mL of diethylene glycol dimethyl ether, and after stirring for 1 h, a transparent and clear solution was obtained. After adding 20 mg of NiCo-NC to it, continue to sonicate in the ultrasonic machine for 0.5 h, transfer the ultrasonic product to the reaction tube, drain the solvent at 80 °C and continue to vacuum for 12 h, the obtained product is 60 %loaded NaBH 4 @NiCo-NC. At 400 °C, the prepared NaBH with 60% loading 4 @NiCo-NC can emit 7.4 wt% within 6h (relative to NaBH 4 quality) of hydrogen, much higher than commercial NaBH 4 The amount of hydrogen released (1.3 wt%) at 440 °C for 6 h.

Embodiment 3

[0048] Prepare NiCo-NC porous nanosheets with the same method as step (1) and step (2) in Example 1, in an argon glove box, 40 mg NaBH 4 It was added to 20 mL of diethylene glycol dimethyl ether, and after stirring for 1 h, a transparent and clear solution was obtained. After adding 20 mg NiCo-NC to it, continue to sonicate in the ultrasonic machine for 0.5 h, transfer the sonicated product to the reaction tube, drain the solvent at 80 °C and continue vacuuming for 12 h, the obtained product is 67 % loaded NaBH 4 @NiCo-NC. At 400 °C, the prepared NaBH with 67% loading 4 @NiCo-NC can emit 7.5 wt% within 6h (relative to NaBH 4 quality) of hydrogen, much higher than commercial NaBH 4 The amount of hydrogen released at 440°C for 6h.

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Abstract

The invention belongs to the technical field of hydrogen storage materials, and particularly relates to a composite hydrogen storage material NaBH4@NiCo-NC and a preparation method thereof. The method disclosed by the invention comprises the following steps: preparing a NiCo-MOFs nanosheet; preparing a sheet-shaped carrier NiCo-NC porous carbon material; and preparing the NaBH4@NiCo-NC. Wherein the synthesis of the flaky NiCo-NC template material is controlled by controlling the temperature rise process; the loading capacity of the nano NaBH4 is 20 to 60 percent, and the mass fraction of the NiCo-NC is 80 to 40 percent. NaBH4 serving as a hydrogen storage material is poor in kinetic performance and cyclic reversibility, while by means of the method, NaBH4 in the composite material is completely reversible at the temperature of 400 DEG C, and the hydrogen desorption kinetic performance is obviously improved. Therefore, the prepared material has excellent hydrogen storage performance. The method is simple in process, 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 @NiCo-NC and its preparation method. Background technique [0002] Hydrogen energy is an ideal alternative energy source for traditional fossil fuels, and the development of safe, efficient, and economical means of hydrogen storage is a key step in the practical application of hydrogen storage materials. Compared with high-pressure gaseous hydrogen storage and liquid hydrogen storage, solid-state hydrogen storage has the advantages of good safety and high hydrogen storage capacity, so more and more researches are devoted to the development and performance improvement of solid-state hydrogen storage material systems[1] . [0003] In recent years, metal complex hydrides have attracted extensive attention from researchers because of their higher mass and volume hydrogen storage densities compared to metal hydrides [2]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/00
CPCC01B3/0078Y02E60/32
Inventor 余学斌陈伟夏广林
Owner FUDAN UNIV
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