Preparation method of fluorine-doped porous carbon nanofiber loaded alkali metal hydrogen storage material

A technology of nanofibers and hydrogen storage materials, applied in the field of hydrogen storage, can solve the problems of reduced hydrogen storage capacity, easy agglomeration of alkali metals, etc., and achieve the effects of improving hydrogen storage performance and reducing dehydrogenation temperature

Active Publication Date: 2021-07-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the binding energy of alkali metals loaded on carbon-based nanomaterials is smaller than that of alkali metal crystals, so in practical applications, alkali metals are easily agglomerated on the surface of nanomaterials, which greatly reduces the hydrogen storage capacity.

Method used

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  • Preparation method of fluorine-doped porous carbon nanofiber loaded alkali metal hydrogen storage material
  • Preparation method of fluorine-doped porous carbon nanofiber loaded alkali metal hydrogen storage material
  • Preparation method of fluorine-doped porous carbon nanofiber loaded alkali metal hydrogen storage material

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preparation example Construction

[0025] The invention provides a method for preparing a fluorine-doped porous carbon nanofiber loaded alkali metal hydrogen storage material, comprising the following steps:

[0026] (1) Immerse polyacrylonitrile (PAN), polyvinylpyrrolidone (PVP) and perfluorosulfonic acid (PFSA) powders in N,N-dimethylformamide (DMF), and stir the mixed system at room temperature for 20 ~48 hours; wherein the mass ratio of polypropylene polyacrylonitrile to polyvinylpyrrolidone is 1:1 or 2:1; PFSA powder accounts for 1~5wt% of the total weight of the PAN and PVP. The PAN, PVP and PFSA powders in the mixed solution account for 8-12wt% of the total weight of the solution.

[0027] (2) Dispersing the mixed solution uniformly in step (1) to prepare porous nanofibers by electrospinning or hydrothermal method;

[0028] (3) replacing the porous PAN / PFSA nanofibers in step (2) with an alkali metal solution to form lithium / calcium-porous PAN / PFSA nanofibers;

Embodiment 1

[0031] 1. Prepare spinning solution, take 0.5gPAN, 0.5gPVP (1:1) and 0.01g PFSA into 9gDMF for mixing and dissolving, the mass fraction of the total weight of PAN, PVP and PFSA powder in the mixed solution is 10wt% ; at 25 o C, stirred for more than 24h, completely dissolved to form a uniform spinning solution.

[0032] 2. Preparation of composite fibers by electrospinning: at a voltage of 18 kV, a receiving distance of 15 cm, a spinning solution delivery rate of 0.2 mL / h, and an electrospinning temperature of 30 o Under the condition of C, PAN / PVP / PFSA composite nanofibers (such as figure 1 shown), placed in a vacuum oven at 80 o C, dry for 8h.

[0033] 3. Porous composite fiber: soak the PAN / PVP / PFSA composite nanofiber in water, put it in an autoclave, then place it in a muffle furnace, 110 o C, after 24h, filter and dry to obtain porous PAN / PFSA nanofibers.

[0034] 4. Li-porous PAN / PFSA nanofibers: soak the porous PAN / PFSA nanofibers in (0.01g / mL) lithium hydroxide s...

Embodiment 2

[0039] 1. Prepare spinning solution, take 1gPAN, 0.5gPVP (2:1) and 0.05g PFSA into 13.5gDMF for mixing and dissolving, the mass fraction of the total weight of PAN, PVP and PFSA powder in the mixed solution is 10wt% ; at 25 o C, stirred for more than 24h, completely dissolved to form a uniform spinning solution.

[0040] 2. Preparation of composite fibers by electrospinning: at a voltage of 18 kV, a receiving distance of 15 cm, a spinning solution delivery rate of 0.2 mL / h, and an electrospinning temperature of 30 o Under the condition of C, obtain PAN / PVP / PFSA composite nanofiber by electrospinning, place 80 in vacuum oven o C drying 8h.

[0041] 3. Porous composite fiber: soak the PAN / PVP / PFSA composite nanofiber in water, put it in an autoclave, then place it in a muffle furnace, 110 o C, after 24h, filter and dry to obtain porous PAN / PFSA nanofibers.

[0042] 4. Li-porous PAN / PFSA nanofibers: soak the porous PAN / PFSA nanofibers in (0.01g / mL) lithium hydroxide solution,...

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Abstract

The invention discloses a preparation method of a fluorine-doped porous carbon nanofiber loaded alkali metal hydrogen storage material belonging to the technical field of hydrogen storage; the method prepares porous nanofibers by electrospinning and hydrothermal methods; then the porous PAN / PFSA nanofibers are replaced with alkali metal solution to form lithium / calcium-porous PAN / PFSA nanofibers, and hydrogen storage materials with large specific surface area, fluorine doping, and alkali metal uniformly dispersed in porous carbon nanofibers are prepared by calcination. Alkali metals and porous carbon nanofibers are beneficial to increase the mass hydrogen storage density, and fluorine doping is not only beneficial to the mass hydrogen storage density of the composite material, but also reduces its dehydrogenation temperature, realizing its reversible hydrogen absorption and desorption. The porous carbon nanofiber loaded alkali metal hydrogen storage material is used in fuel cells, lithium ion batteries and supercapacitors; it can also be used as a carbon loaded alkali metal catalyst.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage, and in particular relates to a preparation method of a fluorine-doped porous carbon nanofiber-loaded alkali metal hydrogen storage material; specifically, a fluorine-doped porous carbon nanofiber-loaded alkali metal hydrogen storage material and its preparation Method and application in the field of hydrogen storage Background technique [0002] As societies develop, increasing air pollution and limited conventional energy sources enhance opportunities to find sustainable and renewable energy sources. Hydrogen energy is one of the ideal energy sources, it is clean, non-toxic and abundant. However, efficient and safe hydrogen storage is the main bottleneck for the large-scale application of hydrogen energy. Therefore, seeking efficient, safe, and stable hydrogen storage materials has become a hot and difficult point in hydrogen energy research in recent years. At present, there are man...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/00C01B32/15B22F9/24D01F1/08D01F1/10D01F8/08D01F8/10
CPCB22F9/24C01B3/0078C01B32/15D01F1/08D01F1/10D01F8/08D01F8/10Y02E60/32
Inventor 陈晓红薛志勇曾宏张永明武英任宇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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