Biomass-based carbon material with high specific surface area and its activation-free preparation method and application

Abstract

The invention discloses a biomass-based carbon material having high specific surface area and an activation-free preparation method and application thereof. In the preparation method, biomass containing SiO2, carbonate and other natural inorganic template components is firstly used as a carbon source, a fluorine-containing polymer serves as a template removing agent, high-temperature carbonization reaction is performed under certain gas protection after even mixing, the characteristic that HF micro-molecules are produced by the fluorine-containing polymer at high temperature is utilized, the SiO2, carbonate and other natural inorganic template components in the biomass are further removed in the carbonization process in an in-situ mode, so that in-situ template removal is completed while biomass carbonization, and then the biomass-based carbon material having high specific surface area is obtained. The preparation method is simple in process, the obtained carbon material has a developed hole structure and a layered nano structure, the BET specific surface area is up to 1234-2620 m<2> / g, the pore volume is 0.89-2.05 cm<3> / g, and the preparation method can be used for preparation of electrode materials of electrochemical capacitors.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a high specific surface area biomass-based carbon material and an activation-free preparation method and application thereof. Background technique [0002] Porous carbon materials have the advantages of rich porosity, high electrical conductivity, excellent physical and chemical stability, and adjustable pore structure. It has attracted the attention of governments and scholars from all over the world, and it is a hot research field in materials science. [0003] In recent years, scientists have made great strides in the synthesis and control of porous carbon materials. With the in-depth development of nanoscience and technology, people put forward higher requirements for the structure design, controllable synthesis, performance and application of porous carbon materials. Among them, the design and synthesis of carbon materials with a highly developed porous struc...

AI Technical Summary

Problems solved by technology

However, so far, the preparation of biomass-based carbon materials with high specific surface area still inevitably uses the activation technology route. This kind of synthesis method not only has the disadvantages of complicated process and unfriendly environment, but also is difficult to control the structure, which has obvious advantages. limitations

[0008] In summary, the current synthesis methods of carbon materials with high specific surface area have the following disadvantages: (1) using a strong base as an activator not only has high preparation costs, but also a complicated post-treatment process that consumes a large amount of water for neutralization and wastes water. resources, and easily cause environmental pollution; (2) consume a large amount of additional template agent, and the preparation process is cumbersome; (3) use corrosive strong alkali or hydrofluoric acid to remove the hard template agent, which is not friendly to the environment and human body; (4) ) Raw materials often use organic small molecules or polymers, the cost is high, and the preparation conditions are harsh

These bottlenecks restrict the development of carbon materials with high specific surface area

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