Method for modifying activated carbon for supercapacitor by hydrogen peroxide

A technology for supercapacitors and hydrogen dioxide, which is applied in the field of activated carbon for supercapacitors modified with hydrogen dioxide, can solve the problems of reduced adsorption capacity of activated carbon, and achieve the advantages of increased surface hydrophilic groups, simple method and improved compatibility. Effect

Active Publication Date: 2014-12-24
山东精工能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Activated carbon activated by sodium hydroxide and potassium hydroxide has more micropores; products activated by phosphoric acid, sulfuric acid, and potassium permanganate have relatively developed mesopores, but liquid phosphoric acid has very high requirements for production equipment, and potassium permanganate and high During the heating process of the specific surface activated carbon, the oxygen is released violently, which is very easy to cause the oxygen to not be fully absorbed by the high specific surface activated carbon, and has already reacted with the surface activated carbon, ablation of most of the surface pores of the activated carbon, and finally leading to a rapid decline in the adsorption capacity of the activated carbon.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method using activated carbon for hydrogen dioxide modified supercapacitors, specifically comprising the following steps:

[0028] 1. Preparation of high-specific surface activated carbon: use petroleum coke as raw material, after drying, crush and sieve the raw material, take the raw material with a particle size of 80-100 mesh and grind and mix it with KOH at a mass ratio of 1:2-5; mix the mixture Put it in a nickel crucible, heat it to 800°C-950°C in an oxygen-free environment, and keep it warm for 2-5 hours; the mixture is cooled to room temperature with the furnace, washed with deionized water to neutral after taking it out, and obtained high specific surface activated carbon after drying . The specific surface area of ​​activated carbon is 2314m 2 / g, the microporous content reaches 90%;

[0029] 2. Oxidation pretreatment of activated carbon: add a certain concentration of hydrogen dioxide solution to the high specific area activated carbon obtained in step 1)...

Embodiment 2

[0033] Effect of hydrogen dioxide concentration:

[0034] Take 10g of activated carbon, four parts, add 100ml of hydrogen dioxide solution with a mass fraction of 10%, 15%, 30%, and 50%, respectively, and treat it for 20 minutes in a constant temperature water bath at 50°C under the condition of ultrasonic radiation power of 200W. Then, they were ultrasonically washed with distilled water, and dried until the effluent reached pH=7.

Embodiment 3

[0036] Effect of temperature:

[0037] Take 10g of activated carbon, add three parts, add 100ml of hydrogen dioxide solution with a mass fraction of 15%, and treat them for 20 minutes in constant temperature water baths at 50°C, 70°C, and 90°C respectively, under the condition of ultrasonic radiation power of 200W, and then, respectively Wash with distilled water ultrasonically until the effluent reaches pH=7, then dry.

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Abstract

The invention provides a method for modifying activated carbon for a supercapacitor by hydrogen peroxide. The preparation method comprises the steps as follows: (1) oxidation pretreatment of activated carbon: a hydrogen peroxide solution is added into high-specific-area activated carbon whose specific area is larger than 2,000m<2>/g and micropore content reaches higher than 90%, and an activated carbon dispersion is obtained, wherein the concentration of the hydrogen peroxide is 10%-50%; (2) ultrasonic treatment: an ultrasonic irradiation treatment is performed on a beaker filled with the activated carbon dispersion under appropriate ultrasonic power, wherein the temperature for ultrasonic treatment ranges from 50 DEG C to 90 DEG C, and the treatment time is 30 min to 60 min; and (3) activated carbon after filtering is placed in a vacuum drying oven and baked for 12 h at 120 DEG C, residual hydrogen peroxide is further decomposed, and the activated carbon for the supercapacitor is obtained.

Description

technical field [0001] The invention relates to a method for producing activated carbon for supercapacitors, in particular to a method for modifying activated carbon for supercapacitors with hydrogen dioxide. Background technique [0002] As a new type of energy storage device between traditional capacitors and secondary batteries, supercapacitors have the characteristics of high current and fast charge and discharge, as well as the energy storage characteristics of batteries. It can be used as a high-power power supply, or as a backup or independent power supply for low-current discharge, and has broad application prospects in many energy storage fields. In recent years, with the continuous expansion of the application field of supercapacitors, activated carbon with high specific surface area and high purity has attracted much attention as the electrode material of supercapacitors; the activation process is the most critical process in the preparation of activated carbon. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08
Inventor 关成善宗继月王勇张敬捧李蜜蜜
Owner 山东精工能源科技有限公司
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