Nitrogen-rich hierarchical pore carbon material and preparation method

Abstract

The invention belongs to the field of material preparation, and specifically relates to a preparation method for a nitrogen-rich hierarchical pore carbon material. The preparation method comprises the following steps of dissolving nitrogen-rich monomers and aldehydes into a solvent I and a solvent II respectively; uniformly dispersing and then mixing, adding a catalyst to adjust the pH value and the reacting temperature; reacting for 2-12h, repeatedly washing the product for 2-3 times by an elution solvent under a centrifuging or ultrasonic effect after the reaction is finished; and drying the product at a temperature of 40-80 DEG C to obtain a nitrogen-rich porous polymer material; and carbonizing the product obtained in the step 1) under the protection of an inert gas at a temperature of 600-1,200 DEG C for 3-8h to obtain the nitrogen-rich hierarchical pore carbon material. The carbon material prepared by the invention contains a large amount of nitrogen elements, and has a quite large specific surface area and a special porous structure; and the carbon material is 200-1,600m<2> / g in the specific surface area, 1-100nm in the pore diameter distribution, and 2-30% in the nitrogen content.

Description

technical field [0001] The invention belongs to the technical field of material preparation, in particular to a method for preparing a nitrogen-rich hierarchical porous carbon material. Background technique [0002] Because nitrogen-rich porous carbon materials retain a large amount of nitrogen and oxygen elements, the carbon materials are hydrophilic and can selectively adsorb polar compounds; moreover, the nitrogen-oxygen bonds distributed in the carbon materials have excellent redox catalytic activity; at the same time, the huge The specific surface area and special hierarchical pore structure make it have broad application prospects in the fields of supercapacitors, highly active oxygen reduction catalysts, adsorbents, and carbon dioxide capture and storage, and has attracted the attention of researchers at home and abroad. The synthesis of nitrogen-containing porous carbon materials is mostly obtained by using nitrogen-containing polymer resins under high-temperature ca...

AI Technical Summary

Problems solved by technology

However, the pore size distribution of the obtained material is narrow, and there are no macropores for rapid material transport, and no micropores for "confinement effect"; at the same time, the cost of the precursor template is high and cannot be reused, resulting in high cost

[0003] The level of nitrogen content and the uniformity of distribution are another important factor affecting the performance of nitrogen-containing carbon materials. Nitrogen-containing polymer materials are often accompanied by severe decomposition during high-temperature carbonization. After the resin is decomposed, ammonia, nitrogen and nitrogen oxides are often obtained. Gas small molecules, so that the nitrogen content in the final material is below 2%, which often cannot show excellent performance as redox catalysts and adsorbents due to fewer active sites

Images