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Electrocatalyst based on hexagonal boron nitride nanosheet-reduced graphene oxide composite material and preparation method and application thereof

A technology of hexagonal boron nitride and composite materials, applied in the field of new materials, can solve the problems of low catalytic efficiency, insufficient pure quality of hexagonal boron nitride/reduced graphene oxide composite materials, etc., so as to improve catalytic performance and reduce electron transfer resistance. , the effect of improving performance

Pending Publication Date: 2022-05-03
JILIN UNIV
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Problems solved by technology

However, the hexagonal boron nitride / reduced graphene oxide composite material formed by this method is not pure enough and of low quality, and there are many incompletely reacted precursors resulting in low catalytic efficiency.

Method used

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  • Electrocatalyst based on hexagonal boron nitride nanosheet-reduced graphene oxide composite material and preparation method and application thereof
  • Electrocatalyst based on hexagonal boron nitride nanosheet-reduced graphene oxide composite material and preparation method and application thereof
  • Electrocatalyst based on hexagonal boron nitride nanosheet-reduced graphene oxide composite material and preparation method and application thereof

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preparation example Construction

[0032] The present invention proposes a method for preparing an electrocatalyst based on hexagonal boron nitride nanosheet-reduced graphene oxide composite material, comprising the following steps:

[0033] (1) Measure the graphene oxide dispersion (0.5-1 mg / mL diluted in deionized water) and hexagonal boron nitride nanosheet powder respectively, disperse them in deionized water, stir, and ultrasonically treat the stirred dispersion, A dispersion containing few-layer boron nitride nanosheets and graphene oxide is obtained.

[0034] (2) Put the dispersion liquid into a reactor lined with polytetrafluoroethylene, and put it into an oven for reaction. The reacted colloid is put into a freeze dryer and dried to a constant weight to obtain a hexagonal boron nitride nanosheet-reduced graphene oxide composite material.

[0035] (3) fully grinding the hexagonal boron nitride nanosheet-reduced graphene oxide composite material, and ultrasonically dispersing the ground composite materi...

Embodiment 1

[0044] A preparation method based on hexagonal boron nitride-reduced graphene oxide composite material electrocatalyst, comprising the following steps:

[0045] 1. Preparation of hexagonal boron nitride nanosheets:

[0046] (1) Weigh 1 g of hexagonal boron nitride micropowder (with a particle size of 10 μm) and 6 g of potassium permanganate powder, and grind it to mix it evenly;

[0047] (2) 120mL concentrated sulfuric acid (mass concentration is 95%) and 15mL phosphoric acid (mass concentration is 85%) are mixed as reaction solvent;

[0048] (3) Mix 18 mL of hydrogen peroxide (mass concentration: 30%) and 120 mL of deionized water, and freeze the solution for 12 hours;

[0049] (4) Add the mixed powder obtained in step (1) into the mixed acid reaction solvent prepared in step (2), and perform magnetic stirring at 75°C to fully react the powder with the acid. After heating and stirring for 12 hours, add it to In step (3) in the ice cube that hydrogen peroxide and deionized w...

Embodiment 2

[0065] A kind of preparation method based on hexagonal boron nitride-reduced graphene oxide composite electrocatalyst is the same as embodiment 1, the difference is that in step 3, measure graphene oxide dispersion 20ml (concentration is 1mg / ml) and Hexagonal boron nitride nanosheet powder 60mg.

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Abstract

The invention provides an electrocatalyst based on a hexagonal boron nitride nanosheet-reduced graphene oxide composite material and a preparation method and application thereof, and belongs to the technical field of new materials. A hexagonal boron nitride nanosheet-reduced graphene oxide composite material is used as an electro-catalytic material, a hydrothermal synthesis method is utilized to enable the composite material to generate a large number of defect sites, then a freeze drying method is utilized to enable the composite material to generate a planar heterostructure, and through the coupling effect of the defect sites between hexagonal boron nitride nanosheets and reduced graphene oxide layers, the graphene oxide / hexagonal boron nitride nanosheet / reduced graphene oxide composite material is prepared. Reaction overpotential is effectively reduced, electro-catalysis efficiency is improved, stability is good, and the catalyst can serve as a metal-free catalyst to be applied to electro-catalysis oxygen reduction reaction.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to an electrocatalyst based on hexagonal boron nitride nanosheet-reduced graphene oxide composite material and its preparation method and application. Background technique [0002] Hydrogen energy is currently recognized as a clean energy source in the world. At present, the main way to obtain hydrogen is through electrolysis of water. The main reactions of electrolysis of water include hydrogen evolution reaction (HER reaction) at the cathode and oxygen evolution reaction (OER reaction) at the anode. The oxygen evolution reaction consists of a four-electron transfer process. Due to the high overpotential and poor cycle stability of materials in the reaction, the efficiency of electrocatalytic oxygen evolution is limited. It is urgent to develop an efficient and stable electrocatalyst for oxygen evolution reaction. [0003] At present, noble metal oxygen evolution reaction cat...

Claims

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Application Information

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IPC IPC(8): C25B11/091C25B1/04
CPCC25B11/091C25B1/04
Inventor 殷红王宏岩詹伟高伟
Owner JILIN UNIV
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