Hierarchical porous carbon material as well as preparation method and application thereof

Abstract

The invention relates to the field of organic porous materials, in particular to a hierarchical porous carbon material and a preparation method and application thereof. The preparation method comprises the following steps: carrying out surface modification on SiO2 nanospheres by adopting trichloro (4-chloromethylphenyl) silane to obtain an R-SiO2 template agent with benzyl chloride chemical functional groups on the surface; the preparation method comprises the following steps: firstly, carrying out in-situ super-crosslinking reaction on the surface of R-SiO2 by taking DCX-as a self-crosslinking functional monomer to obtain R-SiO2 (at) DCX, removing a-SiO2 nanosphere template of the R-SiO2 (at) DCX to prepare HPP, and finally, carrying out high-temperature carbonization treatment to obtain HPC. The benzyl-containing SiO2 reactive template agent is prepared, the in-situ super-crosslinking reaction is induced by means of the reactive template agent to prepare the hierarchical pore material with micropores, mesopores and macropores at the same time, and the prepared hierarchical pore carbon material sample is stable in structure and has good adsorption performance and capacitive performance.

Description

technical field [0001] The invention relates to the field of organic porous materials, in particular to a hierarchical porous carbon material and its preparation method and application. Background technique [0002] Hierarchical porous materials have high specific surface area, high porosity, good permeability, and highly ordered pore structure. Excellent properties such as good chemical stability are widely used in adsorption, energy storage, supercapacitor and other related fields, and gradually become the focus of researchers. [0003] According to different synthesis methods, the preparation methods of hierarchical porous carbon materials can be divided into hard template method and soft template method. The hard template needs to synthesize a template with a predetermined structure, fill it and then crosslink and carbonize it. After the template is washed away, a hierarchical porous carbon material can be prepared. The soft template method uses the self-assembly react...

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Problems solved by technology

[0004] However, the traditional hard template method still has some shortcomings

When using templates to prepare hierarchical porous materials, the traditional crosslinking reaction requires the use of precursors, which are combined with polymers through covalent chemical bonds, resulting in a slightly cumbersome preparation process, and the degree of grafting depends on the degree of chemical bonds.

Although cross-linking bridges can be generated between polymers under catalytic conditions, due to the differences in their chemical structures, heterogeneous interfaces are easily generated during the synthesis of templates, making the prepared hyper-cross-linked polymers prone to agglomeration. Poor dispersion and other phenomena, and the unstable cross-linked structure will also cause the skeleton to collapse during the subsequent carbonization process, destroying the internal pore structure of the material and affecting further performance

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