Fermented bean curd-based porous carbon material, and preparation method and application thereof

Abstract

The invention discloses a fermented bean curd-based porous carbon material. Fermented bean curd taken as a raw material is pre-carbonized to reserve a porous structure formed by fermentation of the fermented bean curd, so as to form a carbon precursor; then, the carbon precursor is subjected to alkali treatment activation and calcination to obtain the fermented bean curd-based porous carbon material, the microstructure of the fermented bean curd-based porous carbon material is in a 3D ant nest shape, and the specific surface area range of the fermented bean curd-based porous carbon material is 3000-4000 m<2>g<-1>; and the fermented bean curd is naturally fermented at low normal temperature. A preparation method of the fermented bean curd-based porous carbon material comprises the following steps: 1) preparing the carbon precursor; and 2) preparing the fermented bean curd-based porous carbon material. When the material is used as a supercapacitor electrode material, the specific capacitance value range is 420-600 F g<-1> when the current density is greater than or equal to 0.5 A g<-1>. The fermented bean curd-based porous carbon material has the following advantages: the fermented bean curd is used as a raw material, and a special microstructure is obtained under the action of gas and microorganisms generated by aging fermentation and does not need to be additionally doped; and the material has high specific surface area, abundant pores and uniform aperture.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a fermented bean curd-based porous carbon material and a preparation method and application thereof. Background technique [0002] With the series of impacts brought by the rapid development of human society, human beings have to deal with the increasingly prominent contradictions between economic development, environmental pollution and sustainable development. In response to these problems, it is feasible to try to start with energy conversion. Chemical batteries are currently the most widely used energy storage devices, but with the development of science and technology, higher requirements are placed on existing energy supply devices. Supercapacitors have received great attention because of their high power density, fast charge and discharge, and long life, which fully meet the requirements of many current devices. , energy regeneration and aerospace and other field...

AI Technical Summary

Problems solved by technology

This preparation method has confirmed the advantages of the above-mentioned biomass materials, but there are still the following technical problems: 1. Fresh tofu is directly selected without aging and fermentation treatment, and no specific pore structure is formed, so it is difficult to expand later. 2. Even if the activator potassium acetate is used, the product still does not have a better pore structure, so the specific capacitance of the prepared material is not high

However, the problems of this method are: 1. When the additional pore-forming agent is added in large-scale production, it is very easy to produce insufficient or excessive pore-forming, resulting in the collapse of the structure, which greatly increases the difficulty of process control and seriously affects the finished product of the product. rate; 2. It is also because of K 2 CO 3 The etching of the carbon material by the pore forming agent leads to a decrease in the structural stability of the carbon material. This adverse effect is reflected in the poor rate performance and cycle performance of the material when used as a supercapacitor

At present, there is no research on the preparation of supercapacitor electrode materials using aged and fermented fermented bean curd as raw materials.

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