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A method for eliminating chemical groups on the surface of supercapacitor carbon

A technology of surface chemistry and capacitive carbon, which is applied in the field of elimination of surface chemical groups, can solve the problems of reduced specific surface area and electrochemical performance, poor treatment effect, high price of hydrazine hydrate, etc., and achieves easy promotion, low cost and high removal efficiency high effect

Active Publication Date: 2019-10-18
南京正森环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hydrazine hydrate is expensive and highly toxic. Using hydrazine hydrate as a reducing agent is costly and easily causes secondary pollution
[0006] To sum up, if the activated carbon surface group adopts the heating reduction method, high-purity inert gas and high temperature are required, the treatment cost is high, and the treatment effect is not good.
In addition, high temperature can cause the merging of activated carbon pores, which reduces the specific surface area and electrochemical performance to a certain extent; hydrazine hydrate is the most commonly used reagent for reducing oxygen-containing groups on the surface of carbon materials, but hydrazine hydrate is expensive and toxic, which is easy to cause secondary damage. Pollution

Method used

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  • A method for eliminating chemical groups on the surface of supercapacitor carbon
  • A method for eliminating chemical groups on the surface of supercapacitor carbon
  • A method for eliminating chemical groups on the surface of supercapacitor carbon

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) supercapacitor carbon powder is crossed 800 mesh sieves, takes by weighing 50g, and hydroquinone is dissolved in water and makes the hydroquinone solution that mass concentration is 5%;

[0028] (2) Dissolve the supercapacitor carbon powder in the hydroquinone solution obtained in step (1) at a mass volume ratio of 1:20, then reflux in the water bath, keep the carbon powder in suspension under magnetic stirring at 2000r / min, and heat it in a water bath at 60°C After 3 hours, filter after the reaction, and further wash the obtained carbon powder with deionized water, dry it at 100°C for 2.5 hours, and take it out to obtain a supercapacitor carbon that eliminates surface functional groups.

Embodiment 2

[0030] (1) Supercapacitor carbon powder is passed through an 800 mesh sieve, and 50g is weighed, and hydroquinone is dissolved in water to obtain a hydroquinone solution with a mass concentration of 10%;

[0031] (2) Dissolve the supercapacitor carbon powder in the hydroquinone solution obtained in step (1) at a mass volume ratio of 1:20, then reflux in the water bath, keep the carbon powder in suspension under magnetic stirring at 2000r / min, and heat it in a water bath at 60°C After 6 hours, filter after the reaction, and further wash the obtained carbon powder with deionized water, dry it at 100°C for 3 hours, and take it out to obtain a supercapacitor carbon that eliminates surface functional groups.

Embodiment 3

[0033] (1) Supercapacitor carbon powder is passed through an 800 mesh sieve, and 50g is weighed, and hydroquinone is dissolved in water to obtain a hydroquinone solution with a mass concentration of 15%;

[0034] (2) Dissolve the supercapacitor carbon powder in the hydroquinone solution obtained in step (1) according to the mass volume ratio of 1:20, then reflux in the water bath, keep the carbon powder in suspension under magnetic stirring at 2000r / min, and heat it in a water bath at 90°C After 9 hours, filter after the reaction, and further wash the obtained carbon powder with deionized water, dry it at 100°C for 3.5 hours, and take it out to obtain a supercapacitor carbon that eliminates surface functional groups.

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Abstract

The invention discloses a method for eliminating chemical groups on the surface of supercapacitor carbon powder. Hydroquinone is dissolved in water, a hydroquinone solution is prepared, then the supercapacitor carbon powder is dissolved in the hydroquinone solution, carbon powder keeps suspension in the magnetic stirring state, water-bath heating and backflow are conducted, after the reaction is over, filtering is conducted, and the obtained carbon powder is then washed and dried. The method is easy to operate, low in cost and small in pollution, products suitable for backflow are stable in electrochemical performance, the attenuation of capacitance is small and the service lifecycle is long.

Description

technical field [0001] The invention relates to a method for eliminating chemical groups on the surface of supercapacitor carbon, in particular to a method for eliminating surface chemical groups of organic supercapacitor carbon. Background technique [0002] Activated carbon with high specific surface area for supercapacitor electrodes is usually produced by KOH activation method and metal-catalyzed high-temperature steam activation method. Since the reaction is carried out in an oxygen atmosphere, the surface of the prepared activated carbon has a large number of oxygen-containing functional groups. During the charge and discharge process, irreversible side reactions such as oxygen evolution and hydrogen evolution will occur, which greatly affect the capacitance and service life of the capacitor, making the price of supercapacitors remain high. Therefore, the elimination technology of oxygen-containing functional groups on the surface of activated carbon has become a key t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G11/32
Inventor 荀波
Owner 南京正森环保科技有限公司
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