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Nitrogen-doped graphene hollow sphere catalyst and preparation method and application thereof

A technology of nitrogen-doped graphene and hollow spheres, which can be used in electrical components, battery electrodes, circuits, etc., and can solve problems such as difficult dispersion and difficulty

Active Publication Date: 2021-02-09
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface of unmodified or surface-treated nitrogen-doped graphene hollow spheres (NGHS) is inert and hydrophobic, and it is difficult to disperse in most organic or inorganic solvents, so it is not easy to uniformly deposit small-sized active metals on its surface. or metal oxide nanoparticles

Method used

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  • Nitrogen-doped graphene hollow sphere catalyst and preparation method and application thereof
  • Nitrogen-doped graphene hollow sphere catalyst and preparation method and application thereof
  • Nitrogen-doped graphene hollow sphere catalyst and preparation method and application thereof

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Embodiment 1

[0033] A kind of nitrogen-doped graphene hollow sphere catalyst, described nitrogen-doped graphene hollow sphere catalyst is modified nitrogen-doped graphene hollow sphere (CN x -NGHS) and transition metal and transition metal oxide nanoparticles loaded on the carbon nitride modified nitrogen-doped graphene hollow spheres (CN x -NGHS) surface composition, in which carbon nitride-modified nitrogen-doped graphene hollow spheres are preferential carriers compared to ordinary carbon-based support materials due to their three-dimensional and porous structure. The doping of heteroatoms such as nitrogen can not only further enhance the conductivity of graphene, but also improve its electron transfer ability by adjusting the electron orbital energy of carbon; it also significantly optimizes its stability, so that the elastic three-dimensional hollow structure can be charged and discharged repeatedly. It is not easy to deform and collapse during the process.

Embodiment 2

[0035] A preparation method of a nitrogen-doped graphene hollow sphere catalyst, the carbon nitride-modified nitrogen-doped graphene hollow sphere is used as a carrier, and cobalt transition metal salt (Co) and cobalt transition metal salt oxide (CoO) nanoparticles are loaded on The carbon nitride-modified nitrogen-doped graphene hollow sphere surface is composed of the following steps:

[0036] Step 1, disperse 100mg graphene oxide (GO) in aqueous solution, then mix with 2g positively charged polystyrene spheres (PS) dispersed in 100mL hydrochloric acid (0.5M) solution, stir at 25°C for 12h, then add 5mL of aniline monomer, add dropwise an aqueous solution containing 7.5g of ammonium persulfate at the same time, and stir the reaction mixture at 0°C for 24h, then add 0.25mol of urea and 0.1mL of hydrazine hydrate, further heat to 110°C, keep for 24h, freeze-dry get the product;

[0037] Step 2, the product that 5g step 1 gains is immersed in the 100mL H that contains 3g melam...

Embodiment 3

[0048] A preparation method of a nitrogen-doped graphene hollow sphere catalyst, the carbon nitride-modified nitrogen-doped graphene hollow sphere is used as a carrier, and nickel transition metal salt (Ni) and nickel transition metal salt oxide (NiO) nanoparticles are loaded on The carbon nitride-modified nitrogen-doped graphene hollow sphere surface is composed of the following steps:

[0049] Step 1, disperse 100mg graphene oxide (GO) in aqueous solution, then mix with 2g positively charged polystyrene spheres (PS) dispersed in 100mL hydrochloric acid (0.5M) solution, stir at 25°C for 12h, then add 5mL of aniline monomer was added dropwise with an aqueous solution containing 7.5g of ammonium persulfate, and the reaction mixture was stirred at 0°C for 24h, then 0.25mol of urea and 0.1mL of hydrazine hydrate were added, further heated to 110°C, and kept for 24h, the obtained The product was lyophilized.

[0050] Step 2, the product that 5g step 1 gains is immersed in the 100...

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Abstract

The invention discloses a nitrogen-doped graphene hollow sphere catalyst and a preparation method and application thereof. The nitrogen-doped graphene hollow sphere catalyst is formed by loading carbon nitride modified nitrogen-doped graphene hollow spheres (CNx-NGHS) serving as a carrier, transition metal and transition metal oxide on the surfaces of the carbon nitride modified nitrogen-doped graphene hollow spheres (CNx-NGHS); the preparation method comprises the following steps: preparing carbon nitride modified nitrogen-doped graphene hollow spheres (CNx-NGHS); and growing the transition metal / oxide nanoparticles on the surface of CNx-NGHS to prepare CNx-NGHS-loaded transition metal / oxide nanoparticles. The application of the nitrogen-doped graphene hollow sphere negative catalyst in catalyzing an oxygen reduction reaction (ORR) and an oxygen evolution reaction (OER) of a rechargeable zinc-air battery can significantly enhance the O2 molecular adsorption efficiency, improve the stability and the conductivity, and improve the stability and the electrical conductivity of the battery. The material has relatively low overpotential in ORR and OER reactions, and can meet the requirements of commercial application.

Description

technical field [0001] The invention belongs to the technical field of dual-function catalysts for air electrodes of rechargeable zinc-air batteries, and specifically relates to a nitrogen-doped graphene hollow sphere catalyst, a preparation method and an application. Background technique [0002] Today, energy dominated by fossil fuels is the main driving force for the economic development of a moderately prosperous society. However, with the excessive consumption and depletion of traditional fossil fuels, not only the global greenhouse effect and environmental pollution have been exacerbated, but also a severe energy crisis has been brought. This not only hinders the establishment of a good well-off society, but also affects the living environment of the people. Therefore, the efficient and rational use of green and sustainable new energy has become a research hotspot in the field of energy at home and abroad. [0003] Metal-air batteries have two important reaction unit...

Claims

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Application Information

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IPC IPC(8): H01M4/96H01M4/86
CPCH01M4/8647H01M4/96Y02E60/50
Inventor 陈佳瑶蒋仲庆田小宁郝晓琼李祥梅张艳玉陆磊罗一卿
Owner ZHEJIANG SCI-TECH UNIV
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