Preparation method of nitrogen doped hollow mesoporous carbon sphere

Abstract

The invention discloses a preparation method of a nitrogen doped hollow mesoporous carbon sphere. According to the preparation method, resorcinol-formaldehyde resin is taken as the carbon precursor, melamine is taken as the nitrogen source, cetyl trimethyl ammonium chloride is taken as the template, silicate oligomer is taken as the structure support, ammonia liquor is taken as the catalyst, and the size and morphology of hollow carbon nano sphere can be effectively controlled by changing the amount of ammonia liquor. The obtained hollow mesoporous carbon sphere has the characteristics of hollow structure, high porosity, large specific surface area, large pore volume, uniform mesoporous size, and nitrogen doping.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of nitrogen-doped hollow mesoporous carbon spheres. Background technique [0002] Nitrogen-doped hollow carbon spheres are widely used in the fields of environment, energy, catalysis, and biomedicine due to their strong surface polarity, high electrical conductivity, many basic sites on the surface, short diffusion paths, low density, and good surface permeability. Broad application prospects. [0003] In recent years, the preparation, structure and properties of nitrogen-doped hollow mesoporous carbon spheres have attracted much attention from research institutions at home and abroad. At present, there are two main methods for preparing nitrogen-doped hollow carbon spheres: (1) post-treatment method: the target functional group is introduced into the pre-synthesized carbon material by an appropriate chemical method, such as impregnating a surf...

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Problems solved by technology

[0004] At present, nitrogen-doped hollow carbon materials have been prepared by different methods: Ferrero et al [G.A.Ferrero, A.B.Fuertes and M.Sevilla. Nitrogen-doped hollow mesoporous carbon spheres were synthesized with solid silica spheres as hard templates and pyrrole monomers as nitrogen-containing carbon precursors. The nitrogen doping of this material is relatively uniform, but the loading process is relatively cumbersome. Not adjustable

[JinH, ZhangHM, ZhongHX, et al., Nitrogen-dopedcarbonxerogel: Anovelcarbon-basedelectrocatalystforoxygenreductionreactioninprotonexchangemembrane (PEM) fuelcells, EnergyEnviron.Sci., 2011, 4(9):3389~3394] etc. used sol-gel polymerization method, Catechol and formaldehyde are used as carbon sources, cobalt nitrate is used as a nitrogen-doped catalyst, ammonia is used as an effective nitrogen source to form a nitrogen-rich atmosphere, and pyridinic nitrogen and graphite nitrogen (quaternary nitrogen) are introduced by in-situ doping In the carbon xerogel, the carbon material prepared by this method changes the electronic structure of the original carbon atom and increases the power supply capacity of the adjacent carbon atom, but the preparation process is expensive and the amount of nitrogen doping is relatively low

[0005] Although some progress has been made in the research of nitrogen-doped hollow mesoporous carbon materials, the existing methods generally need to use more complicated means to introduce nitrogen sources into the carbon sphere matrix or need to add catalysts, etc., and cannot realize the regulation of the size of carbon materials.

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