Nitrogen-doped mesoporous carbon sphere nanomaterial and preparation method thereof

Abstract

The invention discloses a large-specific surface area nitrogen-doped mesoporous carbon sphere nanomaterial and a preparation method thereof. According to the preparation method, a cationic surfactant is taken as a template agent, a hydro-thermal reaction is performed on an organic silicon source, an organic carbon source and an organic nitrogen source to form an organic / inorganic composite, and then the organic / inorganic composite is roasted in a nitrogen atmosphere to obtain a silicon dioxide / nitrogenous carbon sphere nanomaterial, and removing silicon dioxide to obtain the nitrogen-doped mesoporous carbon sphere nanomaterial of a spherical mesoporous structure; the nitrogen-doped mesoporous carbon sphere nanomaterial has a large specific surface area, and preferably, the specific surface area is within the range of 1100-1200m<2> / g; and the pore size of the nanomaterial is within the range of 1.8-3.8, and the pore volume is within the range of 0.7-1.2cm<3> / g. Under the current density of 0.2A / g, the capacitance of the nanomaterial in a 6mol / L KOH electrolyte solution is 554.5F / g, and therefore, the nanomaterial has extremely high electrochemical capacitance and has a potential application prospect in the field of super capacitors. The preparation method is simple and easy to implement, low in cost, good in repeatability, and prone to large-scale production.

Description

technical field [0001] The invention designs a nitrogen-doped mesoporous carbon sphere nano material and a preparation method thereof, belonging to the field of inorganic nano materials. Background technique [0002] The development of new energy has become an important topic in today's world. In many application fields, the requirements for energy storage devices are getting higher and higher, and supercapacitors have been developed rapidly. The performance of supercapacitors is mainly determined by the electrode materials that make up the capacitors. The preparation of electrode materials with high specific capacitance is the focus of supercapacitor research. [0003] Carbon sphere materials show excellent performance in several applications, including supercapacitors, fuel cells, solar cells, Li-ion batteries, CO 2 Harvesting, heavy metal adsorption, photocatalysis and biopharmaceuticals. At the same time, heteroatom-doped carbon materials such as N, S, and B play impo...

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Problems solved by technology

[0008] In summary, the nitrogen content and specific surface area of ​​the prepared carbon materials are the main factors that determine their electrochemical performance. At present, nitrogen-doped carbon materials with large specific surface areas and high nitrogen content cannot be obtained at the same time.

The specific surface area can be increased by activating the carbon material, but the nitrogen content contained in the carbon material will decrease. The specific surface area of ​​the current nitrogen-doped carbon material is 400-1000m 2 / g, the nitrogen content is 0.5-3%, which affects the electrochemical performance of the electrode material

At the same time, carbon spheres with high nitrogen doping amount and high specific surface area have not been reported or disclosed in literature and patents.

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