Preparation method of kitchen waste based composite defect type conductive porous carbon material

Abstract

The invention provides a preparation method of a kitchen waste based composite defect type conductive porous carbon material. The moisture contained by kitchen waste per se is used as a freezing and thawing medium; the water does not need to be added; the thermal degradation performance of the kitchen waste is effectively improved; the heat energy consumption of the subsequent process is reduced;the rich protein of the kitchen waste per se is used as N and S sources; the use of toxic heteroatom precursors such as phosphonitrile or thiourea can be avoided; inorganic salts such as sodium chloride and potassium chloride contained by the kitchen waste per se are used as in-situ catalysts; the high-temperature treatment is not needed; the product graphitization degree and conduction performance can be improved; the prepared porous carbon has excellent conductivity; when the prepared porous carbon is used as a super capacitor energy storage element, good energy storage effects can be obtained without the addition of any conducting agents. The urban organic waste of kitchen waste is used as raw materials; the price of the raw materials is low; the production cost is low; the preparationprocess is simple; wide market prospects and environment benefits are realized; good prospects are provided for the high-value conversion application of the kitchen waste.

Description

technical field [0001] The invention belongs to the technical field of functional carbon materials and energy storage, and specifically relates to a method for preparing kitchen waste-based composite defect-type conductive porous carbon materials by using a freeze-thaw coupled melting method, and particularly relates to the application of conductive carbon materials to the preparation of supercapacitor energy storage device. Background technique [0002] According to a report released by the Qianzhan Industry Research Institute, the annual production of kitchen waste in the country is about 97 million tons. Food waste is extremely perishable and deteriorates. If it is not handled properly, it will not only waste biomass energy, but also endanger the ecological environment and human health. Therefore, the reasonable disposal and resource reuse of food waste has attracted widespread attention from all over the world. At present, the main food waste treatment processes include...

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Problems solved by technology

Chinese patent document CN107335458A discloses a method for preparing iron-nitrogen-phosphorus co-doped carbon materials using p-bromophenylporphyrin, pyrrole, N,N dimethylformamide, triphenylphosphine, etc., but the process is relatively cumbersome Limiting its large-scale development and utilization

Chinese patent document CN107804833A discloses a three-dimensional network nitrogen, phosphorus and sulfur co-doped porous carbon material and its preparation method and application, but the use of toxic chemical reagents such as aniline, hexachlorocyclotriphosphazene and thiourea limits its practical application. Industrialization Development in Application

In addition, although heteroatom doping can improve the conductivity of the material to a certain extent, the degree of improvement still cannot meet the actual needs.

At present, according to most existing literature reports, when using biomass-based porous carbon materials as electrode materials, it is still necessary to add additional conductive agents.

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