Method for producing porous carbon for super capacitor by utilizing lignosulfonate

A lignosulfonate and supercapacitor technology, which is applied in the preparation/purification of carbon, can solve the problems of no porous carbon materials, etc., and achieve the effects of simple preparation method, good capacitance characteristics, and high specific surface area

Inactive Publication Date: 2012-08-15
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lignosulfonate has not been used as a carbon source before, and there has been no report on the method of preparing porous carbon materials for supercapacitors using lignosulfonate as a raw material.

Method used

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  • Method for producing porous carbon for super capacitor by utilizing lignosulfonate
  • Method for producing porous carbon for super capacitor by utilizing lignosulfonate
  • Method for producing porous carbon for super capacitor by utilizing lignosulfonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Utilize calcium lignosulfonate to prepare supercapacitor porous carbon material in the present embodiment and operate according to the following steps:

[0021] (1) Preparation of porous carbon using calcium lignosulfonate as raw material

[0022] Place commercial calcium lignosulfonate directly in a tube furnace, raise the temperature from room temperature to 800 °C at a heating rate of 5 °C / min in a nitrogen atmosphere, keep the temperature for 2 hours, and then lower it to room temperature. Ultrasonic cleaning with dilute hydrochloric acid for 4 minutes, stirring and reacting for 7 hours, suction filtration, washing with water until neutral, and drying at 120°C to obtain the finished product.

[0023] figure 1 It is the XRD pattern of the sample after pyrolyzing calcium lignosulfonate in this embodiment before washing (a) and after washing (b). Calcium carbonate (CaCO 3 ), calcium sulfide (CaS) and other components, the symbols marked in the figure * represent cal...

Embodiment 2

[0030] Utilize lignin sulfonate to prepare porous carbon for supercapacitor in the present embodiment and operate according to the following steps:

[0031] Place the commercial calcium lignosulfonate directly in a tube furnace, raise the temperature from room temperature to 700 °C at a heating rate of 5 °C / min in an argon atmosphere, keep the temperature for 3 hours, and then lower it to room temperature. The dilute nitric acid was ultrasonically cleaned for 4 minutes, stirred and reacted for 6 hours, washed with water until neutral after suction filtration, and dried to obtain the finished product.

[0032] In the same manner as in Example 1, the porous carbon material prepared in this example was made into a porous carbon electrode for electrochemical testing. Figure 4 Curve B in 1 -B 2 It is the cyclic voltammetry curve of the porous carbon electrode prepared in this example. It presents a relatively regular rectangle without redox peaks, indicating that its capacity m...

Embodiment 3

[0034] Place the commercial magnesium lignosulfonate directly in a tube furnace, raise the temperature from room temperature to 800 °C at a heating rate of 5 °C / min in a nitrogen atmosphere, keep the temperature for 1 h, and then lower it to room temperature. Ultrasonic cleaning with dilute nitric acid for 4 minutes, stirring and reacting for 7 hours, suction filtration, washing with water until neutral, and drying to obtain the finished product.

[0035]In the same manner as in Example 1, the porous carbon material prepared in this example was made into a porous carbon electrode for electrochemical testing. Figure 4 Curve C in 1 -C 2 It is the cyclic voltammetry curve of the porous carbon electrode prepared in this example. It presents a relatively regular rectangle without redox peaks, indicating that its capacity mainly comes from the electric double layer capacitance at the interface between the porous carbon electrode and the electrolyte.

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Abstract

The invention discloses a method for producing porous carbon for a super capacitor by utilizing a lignosulfonate. The method is characterized by comprising the following steps of: putting calcium lignosulphonate or magnesium lignosulphonate in nitrogen or argon atmosphere and keeping at 600-800 DEG C for 1-4 hours; after cooling to the room temperature, soaking calcium lignosulphonate or magnesium lignosulphonate in diluted hydrochloric acid or diluted nitric acid having a mass concentration of 10-30%, carrying out ultrasonic dispersion to even distribution and then stirring for not less than 6 hours; next, performing suction filtering and water washing until the eluate is neutral, and then drying, thereby obtaining porous carbon material suitable for manufacturing the super capacitor. The preparation method disclosed by the invention is simple and convenient for operation; and the obtained porous carbon material can be used for preparing the super capacitor which is capable of showing excellent capacitance characteristics.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of porous carbon materials, and in particular relates to a method for preparing porous carbon materials for supercapacitors by using lignosulfonate as a raw material. Background technique [0002] In recent years, with the miniaturization of electronic and electrical equipment and the continuous development of the electric vehicle industry, supercapacitors as backup power and memory backup devices have increasingly attracted people's attention. As a new type of energy storage device, supercapacitor has the characteristics of large capacitance, small leakage current, simple charging and discharging, high specific power and long cycle life. It can provide 20-200 times higher specific energy than electrolytic capacitors, and more than 10 times higher specific power and cycle life than lithium batteries. In order to develop supercapacitors with excellent performance, people have successiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C01B32/05
Inventor 陈祥迎周青青杨保俊
Owner HEFEI UNIV OF TECH
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