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Preparation method, product and application of nitrogen-doped axial carbon fiber/graphene loaded cobalt nano electrocatalyst

A nitrogen-doped graphene, electrocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, electrodes, etc., can solve the problem of burying active sites inside the graphene sheet, affecting the electron transport performance of metalloid characteristics, Catalytic active sites are doubled and other problems, to achieve the effect of improving catalytic activity, low price and easy control

Pending Publication Date: 2021-01-01
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when N atoms are doped in single-layer graphene, its Fermi level moves above the Dirac point, and the band gap between the conduction band and the valence band is opened, which will inevitably affect its original metalloid properties, namely Efficient electron transport performance
[0005] However, nitrogen-doped graphene itself is a flexible structure, and it is easy to agglomerate layers to form a graphitized structure, which will cause the internal active sites of the graphene sheets to be buried, resulting in a double decrease in catalytic active sites.

Method used

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  • Preparation method, product and application of nitrogen-doped axial carbon fiber/graphene loaded cobalt nano electrocatalyst
  • Preparation method, product and application of nitrogen-doped axial carbon fiber/graphene loaded cobalt nano electrocatalyst

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Effect test

Embodiment 1

[0032] A nitrogen-doped axial carbon fiber / graphene-supported cobalt nano-electrocatalyst, using cellulose and nitrogen sources as raw materials, high-temperature in-situ carbonization to form a graphene fiber axial composite nitrogen-doped graphene sheet structure, while loading Co Nanoparticles obtain Mott-Schottky type heterojunctions, which are prepared as follows:

[0033] The first step, the preparation of carbon fiber and nitrogen-doped graphene axial composite nanomaterials: using coconut bacterial cellulose, urea, and melamine as raw materials, coconut bacterial cellulose, urea, and melamine were mixed in a mass ratio of 1:20:20 Mix evenly, then place it under the protection of nitrogen for calcination, control the calcination temperature to 1000 ℃, bacterial cellulose and urea are carbonized in situ to form graphite carbon fiber axial composite nitrogen-doped graphene sheet structure, and finally cool naturally to obtain carbon fiber and nitrogen-doped Miscellaneous ...

Embodiment 2

[0038] A kind of nano electrocatalyst of nitrogen-doped axial carbon fiber / graphene supported cobalt, prepared according to the following steps:

[0039] The first step, the preparation of carbon fiber and nitrogen-doped graphene axial composite nanomaterials: using coconut bacterial cellulose, urea, and melamine as raw materials, coconut bacterial cellulose, urea, and melamine were mixed in a mass ratio of 1:20:20 Mix evenly, then place it under the protection of nitrogen for calcination, control the calcination temperature to 1200 ℃, bacterial cellulose and urea are carbonized in situ to form graphite carbon fiber axial composite nitrogen-doped graphene sheet structure, and finally cool naturally to obtain carbon fiber and nitrogen-doped Heterographene Axial Composite Nanomaterials.

[0040] The second step, the preparation of carbon fiber / nitrogen-doped graphene axial composite material supported cobalt electrocatalyst: add 2.0 g of carbon fiber and nitrogen-doped graphene ...

Embodiment 3

[0042] A kind of nano electrocatalyst of nitrogen-doped axial carbon fiber / graphene supported cobalt, prepared according to the following steps:

[0043] The first step, the preparation of carbon fiber and nitrogen-doped graphene axial composite nanomaterials: using coconut bacterial cellulose, urea, and melamine as raw materials, coconut bacterial cellulose, urea, and melamine were mixed in a mass ratio of 1:20:20 Mix evenly, then place it under the protection of nitrogen for calcination, control the calcination temperature to 900 ℃, bacterial cellulose and urea are carbonized in situ to form graphite carbon fiber axial composite nitrogen-doped graphene sheet structure, and finally cool naturally to obtain carbon fiber and nitrogen-doped Heterographene Axial Composite Nanomaterials.

[0044] The second step, the preparation of carbon fiber / nitrogen-doped graphene axial composite material supported cobalt electrocatalyst: add 1.5 g of carbon fiber and nitrogen-doped graphene a...

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Abstract

The invention provides a preparation method, a product and application of a nitrogen-doped axial carbon fiber / graphene loaded cobalt nano electrocatalyst, cellulose and a nitrogen source are taken asraw materials, a graphene fiber axial composite nitrogen-doped graphene lamellar structure is formed by high-temperature in-situ carbonization, and meanwhile, Co nano particles are loaded to obtain aMott-Schettky heterojunction. The method is simple in process, easy to control, green and safe, and can realize macro preparation. The nitrogen-doped axial carbon fiber / graphene loaded cobalt nano electrocatalyst prepared by the invention has relatively high catalytic activity, and shows relatively high electrocatalytic hydrogen production rate at different scanning rates.

Description

technical field [0001] The invention relates to the technical field of hydrogen evolution catalyst and its preparation, in particular to a preparation method, product and application of a nitrogen-doped axial carbon fiber / graphene-supported cobalt nanometer electrocatalyst. Background technique [0002] The depletion of fossil energy and the increasingly serious problem of environmental pollution are major issues that threaten the survival and development of human beings. Finding and developing green renewable energy that can replace fossil energy has become the focus of research at home and abroad. h 2 The product of energy combustion is only water, without any pollution, and its atomic utilization rate is 100%, so H 2 As a clean and efficient energy source, it has always been the pursuit of scientific research. The method of using electric energy to electrolyze water to produce hydrogen is a method for preparing H 2 As an effective way of energy, the currently commerc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/06C25B1/04
CPCB01J27/24C25B1/04C25B11/04B01J35/33B01J35/58Y02E60/36
Inventor 崔大祥王敬锋
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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