Fluorine and nitrogen co-doped three-dimensional graphene material and one-step carbonization preparation method thereof

Abstract

The invention discloses a fluorine and nitrogen co-doped three-dimensional graphene material. The fluorine and nitrogen co-doped three-dimensional graphene material is prepared by taking polytetrafluoroethylene and melamine as precursors through mixing and uniformly grinding and carrying out a one-step carbonization method; fluorine and nitrogen elements of three-dimensional graphene are uniformlydistributed; the specific surface area is 1200 to 1400m<2>g<-1> and the total pore volume is 2.5 to 2.9cm<3>g<-1>; the specific surface area of the material can be greatly regulated and controlled tobe 50 to 1600m<2>g<-1> through changing the carbonization temperature and the total pore volume is regulated and controlled to be 0.2 to 3.2cm<3>g<-1>. The one-step carbonization preparation method comprises the following steps: 1, mixing the raw materials; 2, carrying out a one-step carbonization method. Three-dimensional graphene grids in the material are uniform, and the fluorine and nitrogenelements are uniformly distributed; the repeatability is good and the carbonization temperature is moderate; the material is synthesized through one-step carbonization and a technology is simple and easy to operate. The material has a wide application prospect in the field of super-capacitors and a carbon functional material.

Description

technical field [0001] The invention relates to the field of modified carbon materials, in particular to a fluorine and nitrogen co-doped three-dimensional graphene material and a one-step carbonization preparation method thereof. Background technique [0002] Energy is the main driving force for the development of human society. Throughout the history of human development, every innovation in energy technology has caused major changes in social productivity and production relations, thus promoting the development of history. However, due to the rapid development of industrialization and the unrestrained exploitation of fossil fuels such as coal, oil, and natural gas, a series of problems such as resource shortage and environmental pollution have been caused, and the development and use of renewable energy have received increasing attention. As a green and environmentally friendly functional material, carbon nanomaterials are widely used in new energy storage and conversion...

AI Technical Summary

Problems solved by technology

The technical problems of this technology are: xenon difluoride has a foul smell, is toxic, and has strong oxidizing properties.

The technical problem of this technology is that hydrofluoric acid is a toxic and highly corrosive reagent.

[0016] 1. The experimental procedure requires 5 steps, the process is complicated, the product quality is not easy to control, and the production cost is greatly increased;

[0017] 2. The thickness of the obtained material reaches tens of nanometers. If the thickness of the material is too large, it will not have the characteristics of graphene directly, and also reduce the specific surface area of ​​the material.

[0020] 1. The fluorine source polytetrafluoroethylene suspension is expensive;

[0021] 2. The production process requires two steps of carbonization, and the preparation time is long;

[0027] At present, there is no public technology that uses industrial-grade polytetrafluoroethylene powder and melamine powder as precursors to prepare fluorine and nitrogen co-doped three-dimensional graphene materials by one-step carbonization and applies them to supercapacitors. In the present invention, we realize the following: Polytetrafluoroethylene powder and melamine powder are used as precursors to directly prepare fluorine and nitrogen co-doped functionalized three-dimensional graphene materials. Interestingly, when the mixed precursor is carbonized, its specific surface area can change sensitively with temperature

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