Method for preparing bamboo shoot shell-based activated carbon for super capacitor

Abstract

The invention discloses a method for preparing bamboo shoot shell-based activated carbon for a super capacitor. The method comprises the following steps of firstly carrying out pretreatment processes such as washing and drying on raw material bamboo shoot shells; then carbonizing the bamboo shoot shells at high temperature, treating by acid to remove trace metal elements, washing by using distilled water and drying; finally, activating, washing and drying to obtain bamboo shoot shell-based activated carbon. The bamboo shoot shell-based activated carbon is tubular in microstructure, the micropore structure is developed, the specific surface area is as high as 3162m<2> / g, and the specific capacitance is as high as 308Fg<-1> when the electric current density is 1Ag<-1>; when the electric current density is 2Ag<-1>, the specific capacitance has no attenuation basically and is as high as 271Fg<-1> after 10000 times of circulation, and thus the cycle performance is excellent, so that the bamboo shoot shell-based activated carbon has good application prospects in the fields of super capacitors and energy storage. In addition, according to the invention, the bamboo shoot shells are taken as raw materials, so that the comprehensive utilization of the wastes is realized.

Description

technical field [0001] The invention relates to a preparation method of activated carbon, in particular to a preparation method of bamboo shoot shell-based activated carbon for supercapacitors, and belongs to the technical field of material preparation. technical background [0002] Supercapacitor is a new type of energy storage device between traditional capacitors and chemical power sources. It has some advantages that traditional capacitors and batteries do not have: high power density, long cycle life, fast charging, and no pollution to the environment. It has broad application prospects in the fields of electric vehicles, information technology, aerospace, and national defense technology. With the development of new application fields, people's demand for supercapacitors with high specific capacity and good stability is becoming more and more urgent. [0003] A supercapacitor is mainly composed of four parts, namely a current collector, an electrolyte, an electrode mate...

AI Technical Summary

Problems solved by technology

The main raw materials of commercial activated carbon produced in my country are coal, wood and wooden fruit shell cores, etc. Activated carbon produced from wooden fruit shell cores has limited application performance in supercapacitors. Although the technology of producing activated carbon from coal and wood is relatively mature, the performance is still to be determined. improve

And the use of coal as a raw material also has some obvious defects: the price of coal is high, it is a non-renewable resource, and the activated carbon prepared by it contains heavy metals and other harmful elements so that its use is limited

Xue Jianping [1] The process of preparing activated carbon based on zinc chloride activation method is disclosed, and the optimal process conditions for preparing activated carbon are: mix bamboo shoot shell chips with 5% zinc chloride solution with a material-to-liquid ratio of 1:2, and heat the activated carbon at 600 ° C. Under the condition of activation for 1.5h, bamboo shoot shell-based activated carbon can be obtained, but there is no introduction to the relevant performance parameters and applications of activated carbon.

Images