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Preparation method of high-specific surface area nitrogen-rich classified porous carbon electrode material for supercapacitor

A high specific surface area, supercapacitor technology, applied in hybrid capacitor electrodes, chemical instruments and methods, carbon compounds, etc., to achieve simple process, low energy consumption, and environmental friendliness

Inactive Publication Date: 2018-09-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are no literature and patent reports at home and abroad for direct preparation of nitrogen-rich hierarchical porous carbon electrode materials with high specific surface area by high-temperature pyrolysis using disodium zinc EDTA as carbon source.

Method used

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  • Preparation method of high-specific surface area nitrogen-rich classified porous carbon electrode material for supercapacitor
  • Preparation method of high-specific surface area nitrogen-rich classified porous carbon electrode material for supercapacitor
  • Preparation method of high-specific surface area nitrogen-rich classified porous carbon electrode material for supercapacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Take 25g of ethylenediaminetetraacetic acid disodium zinc salt and carbonize it at 700°C for 10 h under nitrogen atmosphere. The carbonized product is washed with 0.5 mol / L hydrochloric acid and water in sequence to prepare porous carbon. The nitrogen adsorption and desorption test shows that the specific surface area of ​​the activated carbon material is 1530m 2 g -1 , pore volume 1.23 cm 3 g -1 , Mesoporosity is 50.5%. The pore size distribution curve is as figure 1 As shown, it shows that the pore size of the prepared carbon material contains micropores of 1-2nm and mesopores of 10-30nm. TEM as figure 2 As shown, abundant mesopores and micropores can be observed. XPS test nitrogen element distribution such as image 3 As shown, the material has a nitrogen content of 7.46%. The above materials were mixed according to the ratio of active material: acetylene black: PTFE = 85:10:5 to prepare electrode sheets, at 6 mol L -1 Two-electrode constant-current charge...

Embodiment 2

[0022] Take 30g of ethylenediaminetetraacetic acid disodium zinc salt and carbonize it at 850°C for 2 hours under the atmosphere of argon and nitrogen mixed gas volume ratio (1:1). The carbonized product was washed with 3 mol / L nitric acid and water in sequence to prepare porous carbon. The specific surface area of ​​the activated carbon material is 2268m 2 g -1 , pore volume 2.6 cm 3 g -1 , the mesoporosity is 53.4%, and the nitrogen content is 6.71%. According to the test method of Example 1, when its current density is 0.1 A / g, the specific capacitance is calculated from the discharge curve up to 330F g -1 , the current density increased to 50 A g -1 , the specific capacitance still maintains 270 F g -1 , indicating that it has both high specific capacity and excellent rate capability.

Embodiment 3

[0024] Take 40g of ethylenediaminetetraacetic acid disodium zinc salt and carbonize it at 1000°C for 1h under an argon atmosphere. The carbonized product is washed with mixed acid of 2mol / L hydrochloric acid and 1mol / L sulfuric acid, and washed with water to prepare porous carbon. The specific surface area of ​​the porous carbon material is 2680m 2 g -1 , pore volume 3.0 cm 3 g -1 , The mesoporosity is 59.4%. Nitrogen content 2.23%. According to the test method of Example 1, when its current density was 0.1 A / g, the specific capacitance was calculated from the discharge curve up to 326F g -1 , the current density increased to 50 A g -1 , the specific capacitance still remains 289 F g -1 , its specific capacity and rate performance are outstanding.

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Abstract

The invention discloses a preparation method of a high-specific surface area nitrogen-rich classified porous carbon electrode material for a supercapacitor. Zinc disodium EDTA is taken as the carbon source, is carbonized at the constant temperature of 700-1000 DEG C under the protection of the inert gas, and then is pickled with acid and washed with water to prepare the high-specific surface areanitrogen-rich classified porous carbon electrode material. The prepared high-specific surface area nitrogen-rich classified porous carbon electrode material has a high specific surface area (1500-2800m<2>g<-1>), has a developed classified porous structure (the pore volume is 1.2-3.6 cm<3>g<-1>), is rich in nitrogen (the nitrogen content is 1.8-12.6%), and has excellent capacitive performance andrate capability when being applied as the electrode material for the supercapacitor. The method is simple, environmentally friendly, and relatively low in cost.

Description

technical field [0001] The invention relates to the technical field of supercapacitor electrode materials, in particular to a method for preparing a high specific surface area nitrogen-enriched hierarchical porous carbon electrode material for supercapacitors. Background technique [0002] Supercapacitor, also known as electrochemical capacitor, is a new type of energy storage element whose performance is between that of a physical capacitor and a secondary battery. Compared with physical capacitors, supercapacitors have higher energy density. Compared with secondary batteries, supercapacitors have the advantages of high power density, long cycle life, fast charge and discharge speed, safety, environmental protection and pollution-free. They are used in electric vehicles, renewable resource power generation, mobile devices Power supply and high-tech weapons and other fields have broad application prospects. [0003] Activated carbon materials have the characteristics of hig...

Claims

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Application Information

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IPC IPC(8): C01B32/318H01G11/44
CPCC01B32/318H01G11/44Y02E60/13
Inventor 徐斌于树凯王浩然
Owner BEIJING UNIV OF CHEM TECH
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