Nitrogen-doped grading porous carbon microspheres, and preparation method and application thereof

Abstract

The invention discloses nitrogen-doped grading porous carbon microspheres. The nitrogen-doped grading porous carbon microspheres are prepared by performing hydrothermal reaction on glucose and a nitrogen-containing compound and then performing activation, wherein the specific surface area is high and is 1160 to 1791 m<2> / 1, the pore diameter is distributed uniformly and the micropore content is high. The preparation method comprises the following steps: 1) preparing a nitrogen-containing precursor, adding the glucose and the nitrogen-containing compound into water, stirring uniformly, reacting, filtering, washing and drying to obtain the nitrogen-containing precursor; 2) carbonizing and activating the nitrogen-containing precursor, mixing the nitrogen-containing precursor and an alkaline inorganic matter, soaking into water, stirring and drying, and calcining and activating to obtain the nitrogen-doped modified grading porous carbon microspheres; and 3) performing aftertreatment on thenitrogen-doped modified grading porous carbon microspheres, soaking the nitrogen-doped modified grading porous carbon microspheres in a hydrochloric acid solution, washing, filtering, drying and grinding. When the nitrogen-doped grading porous carbon microspheres serve as supercapacitor electrode materials, the specific electric capacity is 248 to 407 F / g. The nitrogen-doped grading porous carbonmicrospheres have an application prospect in the fields of supercapacitors, lithium ion batteries and electric catalysis.

Description

technical field [0001] The invention relates to the technical field of porous materials, in particular to a nitrogen-doped hierarchical porous carbon microsphere and its preparation method and application. Background technique [0002] Carbon materials have been widely used in electrode materials of electric double layer supercapacitors due to their advantages such as good electrical conductivity, high specific surface area, adjustable porosity / morphology, and good chemical stability, and have obtained better capacitance characteristic. One of the key issues in carbon-based supercapacitors is to further increase the specific capacity to increase their energy density. One of the ways to achieve this goal is to introduce heteroatoms, such as O, N, B, or S, into carbon materials, so that they not only provide electric double layer capacitance, but also can be oxidized by the redox between the heteroatoms and the electrolyte. The reaction provides a pseudocapacitance. Among m...

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Problems solved by technology

By optimizing the pore size distribution of porous carbon materials, a porous carbon material with a hierarchical structure is prepared, thereby improving the utilization rate of micropores, improving the limited specific capacity and cycle instability as electrode materials, and solving the current high-capacity electrodes. The material preparation process is complicated, the raw materials are expensive and difficult to standardize, and it is difficult to produce on a large scale

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