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Three-dimensional nitrogen-boron co-doped graphene aerogel preparation method

A graphene aerogel, three-dimensional nitrogen boron technology, applied in graphene, chemical instruments and methods, nitrogen compounds, etc., can solve the problems of poor induction effect, small specific surface area, insufficient active sites, etc., and achieve good pores. Structure, broad application prospects, the effect of large specific surface area

Active Publication Date: 2017-06-13
SHANGHAI UNIV
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Problems solved by technology

However, the graphene aerogels prepared by the above method are all doped with single heteroatoms, and the obtained composite materials still have insufficient doping ratio, small specific surface area, poor inductive effect brought by single atoms, and insufficient active sites. many disadvantages

Method used

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  • Three-dimensional nitrogen-boron co-doped graphene aerogel preparation method
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  • Three-dimensional nitrogen-boron co-doped graphene aerogel preparation method

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Embodiment Construction

[0029] The technical solutions of the present invention will be further described below in conjunction with specific examples, but the protection scope of the present invention is not limited to the following examples.

[0030] The preparation method of above-mentioned three-dimensional nitrogen-boron co-doped graphene airgel comprises the following steps:

[0031] (1). The preparation method of graphene oxide is the improved Hummers' method (Yanwu Zhu, Shanthi Murali, Weiwei Cai, Xuesong Li, Ji Won Suk, Jeffrey R. Potts, and Rodney S. Ruoff. Graphene and Graphene Oxide: Synthesis , Properties, and Applications. Adv. Mater. 2010, 22, 3906–3924), as follows:

[0032] (1-1). Put 25mL of concentrated sulfuric acid into the flask under ice-bath conditions, then add 1.2g of graphite flakes and 1g of potassium permanganate into the flask while stirring until completely dispersed, and raise the temperature to 35 °C, and stirred for another 2 h;

[0033] (1-2). Slowly add 40mL deion...

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Abstract

The invention discloses a three-dimensional nitrogen-boron co-doped graphene aerogel preparation method, which comprises: (1) preparing graphene oxide by using an improved Hummers method; (2) preparing polyhydroxy boron nitride by using an atom substitution method; and (3) preparing a nitrogen-boron co-doped graphene hydrogel having a three-dimensional structure by using the graphene oxide as a substrate, by using the polyhydroxy boron nitride as a nitrogen source and a boron source through a solvothermal method, and carrying out freeze-drying to obtain the composite aerogel. Compared to the pure graphene gel, the composite material of the present invention has characteristics of large specific surface area and good pore channel structure.; and by doping the nitrogen atom and the boron atom, the material has the more active sites so as to provide wide application prospect.

Description

technical field [0001] The invention relates to a preparation method of a three-dimensional nitrogen-boron co-doped graphene airgel, which belongs to the field of functional materials. [0002] technical background [0003] The graphene airgel formed by random stacking of graphene sheets is a kind of three-dimensional structure of graphene. The graphene airgel has good electrical conductivity, high specific surface area, high porosity, adjustable pore structure size, density Low and good adsorption properties. It has great application potential in the fields of energy storage, catalyst and environmental protection. However, graphene airgel, as an almost pure carbon material (containing a small amount of oxygen and hydrogen), provides fewer active sites during application, which severely limits the performance of graphene airgel. [0004] The main sources of active sites in pure graphene aerogels are defect sites (e.g., edges, boundaries, disorder) in the material. In order...

Claims

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Application Information

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IPC IPC(8): C01B32/184C01B32/198C01B21/064C01B32/194
CPCC01B21/064C01B2204/32C01P2002/72C01P2002/82C01P2002/85C01P2004/03C01P2006/17
Inventor 相明辉刘英洪力王学辰
Owner SHANGHAI UNIV
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