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Graphene vertical ordered array doped with heteroatoms and preparation method and application thereof

A vertically ordered, graphene technology, applied in chemical instruments and methods, electrodes, electrolysis processes, etc., can solve problems such as research reports on vertical arrays of doped graphene, etc., to increase effective exposure, promote diffusion, and conduct electricity. good effect

Active Publication Date: 2019-09-06
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing doped graphene is limited to two-dimensional graphene or three-dimensional porous graphene materials, and there is no research report on the vertical array of doped graphene

Method used

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  • Graphene vertical ordered array doped with heteroatoms and preparation method and application thereof
  • Graphene vertical ordered array doped with heteroatoms and preparation method and application thereof
  • Graphene vertical ordered array doped with heteroatoms and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Add 60 mg of graphene oxide and 300 mg of boric acid into 10 mL of deionized water for ultrasonic dispersion for 1 h to form a mixed dispersion with a concentration of graphene oxide of 6 mg / mL.

[0050] (2) After mixing 0.3mL of ethanol and 10mL of graphene dispersion, continue ultrasonication for 1h to obtain a mixed solution;

[0051] (3) The mixed solution obtained in step (2) was frozen with liquid nitrogen in a bottom-up manner, and after being completely frozen, it was put into a freeze dryer to dry for 48 hours.

[0052] (4) Put the graphene airgel formed after freeze-drying into a tube furnace protected by an argon atmosphere, at a heating rate of 10°C / min, 200°C for 2h, 1000°C for 3h, and finally in an argon atmosphere The temperature is lowered in the middle, and the vertical ordered array of graphene doped with B atoms is prepared.

[0053] The content of graphene prepared in this embodiment is 78.56wt%, the content of oxygen atoms is 13.42wt%, and the ...

Embodiment 2

[0062] (1) Dissolve 60 mg of graphene oxide and 60 mg of urea in 10 mL of deionized water, and ultrasonically disperse for 1 hour to form a mixed dispersion with a graphene oxide concentration of 6 mg / mL.

[0063](2) After adding 0.3 mL of ethanol and 10 mL of graphene dispersion and mixing, continue ultrasonication for 1 h to obtain a mixed solution.

[0064] (3) The mixed solution obtained in (2) was frozen in a bottom-up manner with liquid nitrogen, and then put into a freeze dryer to dry for 48 hours after freezing completely.

[0065] (4) Put the graphene airgel formed after freeze-drying into a tube furnace protected by an argon atmosphere, at a heating rate of 10°C / min, 200°C for 2h, 700°C for 3h, and finally in an argon atmosphere The temperature is lowered in the middle, and the vertical ordered array of graphene doped with N atoms is prepared.

[0066] The graphene vertical ordered array prepared by this embodiment is carried out X-ray photoelectron energy spectrum,...

Embodiment 3

[0068] (1) Add 50 mg of graphene oxide into 10 mL of deionized water and ultrasonically disperse for 1 h to form a graphene oxide dispersion with a concentration of 5 mg / mL.

[0069] (2) Add 300 μL of methanol and 1 μL of phytic acid (35 wt.%) into the above graphene dispersion and continue ultrasonication for 1 h.

[0070] (3) The mixed solution was frozen with liquid nitrogen in a bottom-up manner, and after freezing, put it into a freeze dryer to dry for 48 hours.

[0071] (4) Put the graphene airgel formed after freeze-drying into a tube furnace, heat reduction at a high temperature at a rate of 10°C / min under an argon atmosphere, continue at 200°C for 2h, and continue at 800°C for 3h, and finally The temperature is lowered in an argon atmosphere, and a vertical ordered array of graphene doped with P atoms is prepared.

[0072] The graphene vertical ordered array prepared by this embodiment is carried out X-ray energy spectrum analysis, the result is as follows Figure 9...

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Abstract

The invention discloses a graphene vertical ordered array doped with heteroatoms and a preparation method and application thereof. The doped graphene vertical ordered array prepared by one-step doping, vertical and reduction by the method has the product characteristics of low price, easy availability, high efficiency, stability and large-scale production. The graphene vertical ordered array prepared by the preparation method is three-dimensional ordered array graphene, and the heteroatoms are doped in the graphene; due to the doping of the heteroatoms, the prepared material has the characteristics of large specific surface area and multi-porosity on the micro level. The three-dimensional array graphene has the characteristics of highly ordered arrangement. The material has good electricalconductivity, excellent mechanical properties and high catalytic activity, and has broad application prospects in the HER field.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of graphene preparation, in particular to a graphene vertical ordered array doped with heteroatoms and a preparation method and application thereof. [0003] 【Background technique】 [0004] Hydrogen production by electrolysis of water is an important means to achieve low-cost industrial production of hydrogen, and the electrocatalytic hydrogen evolution reaction (Hydrogen Evolution Reaction, HER) is very important in this process. It is well known that efficient HER catalysts are required for HER to reduce the overpotential and accelerate the reaction kinetics. At present, platinum group noble metals are the best catalysts for HER, but their high price and limited reserves limit their large-scale application. Therefore, exploring low-cost, high-activity, and stable non-precious metal HER catalysts is expected to realize the large-scale application of water electrolysis hydrogen production technology. [0005...

Claims

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Application Information

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IPC IPC(8): B01J27/20B01J27/24B01J27/16B01J35/10C25B11/06C25B1/04
CPCB01J27/20B01J27/24B01J27/16C25B11/04C25B1/04B01J35/33B01J35/60Y02E60/36
Inventor 姜彬梁珂朋杨祖进
Owner NORTHWEST UNIV
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