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Process using date pits to prepare nitrogen-doped porous carbon material and preparation method of super-capacitor electrode

A nitrogen-doped porous carbon and nitrogen-doped carbon technology is applied in hybrid capacitor electrodes, chemical instruments and methods, carbon compounds, etc., and can solve problems such as increased experimental difficulty, high cost, and material performance has not been greatly improved. , to achieve the effect of being beneficial to industrialization, low cost, improving adsorption performance and capacitance performance

Active Publication Date: 2016-06-08
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the arc discharge method for doping increases the difficulty of the experiment, the cost is relatively high, and the performance of the material has not been greatly improved.

Method used

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  • Process using date pits to prepare nitrogen-doped porous carbon material and preparation method of super-capacitor electrode
  • Process using date pits to prepare nitrogen-doped porous carbon material and preparation method of super-capacitor electrode
  • Process using date pits to prepare nitrogen-doped porous carbon material and preparation method of super-capacitor electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Wash and dry the jujube stones, weigh 10 g of crushed jujube stones, put them into a porcelain crucible, and carbonize them at 600°C for 2 hours in a mixed gas of nitrogen, ammonia and water vapor to obtain nitrogen-doped carbon materials.

[0049] The mixed gas is made of nitrogen with 300mLmin -1 The flow rate was prepared by 75 °C, 1M ammonium nitrate solution. Control the volume ratio of the ammonia gas, water vapor and inert gas to 1:1-3:100-200 as much as possible, especially the volume ratio of 1:2:150 is better.

[0050] Take 1g of nitrogen-doped carbon material and 3g of KOH and add water to mix evenly, then dry it at 130°C, put the resulting mixture in a tube furnace and calcinate at 800°C for 2 hours in a nitrogen atmosphere, and wash the obtained nitrogen-doped porous carbon material with distilled water until neutral , dried at 100°C for later use.

[0051] After testing, its specific surface area reaches 2780m 2 g -1 , with a total pore volume of 1.1 c...

Embodiment 2

[0060] Wash and dry the jujube stones, weigh 10 g of crushed jujube stones, put them into a porcelain crucible, and carbonize them at 600°C for 2 hours in a mixed gas of nitrogen, ammonia and water vapor to obtain a nitrogen-doped carbon material.

[0061] The mixed gas is made of nitrogen with 300mLmin -1 The flow rate was prepared by 75 °C, 1M ammonium nitrate solution. Control the volume ratio of the ammonia gas, water vapor and inert gas to 1:1-3:100-200 as much as possible, especially the volume ratio of 1:2:150 is better.

[0062] Take 1g of nitrogen-doped carbon material and 3g of KOH and add water to mix evenly, then dry at 130°C, put the resulting mixture in a tube furnace and calcinate at 700°C for 2 hours in a nitrogen atmosphere, and wash the obtained nitrogen-doped porous carbon material with distilled water until neutral , dried at 100°C for later use.

[0063] After testing, its specific surface area reaches 2400m 2 g -1 , with a total pore volume of 0.93 cm...

Embodiment 3

[0067] Wash and dry the jujube stones, weigh 10 g of crushed jujube stones, put them into a porcelain crucible, and carbonize them at 600°C for 2 hours in a mixed gas of nitrogen, ammonia and water vapor to obtain nitrogen-doped carbon materials.

[0068] The mixed gas is made of nitrogen with 300mLmin -1 The flow rate was prepared by 75 °C, 1 M ammonium nitrate solution. Control the volume ratio of the ammonia gas, water vapor and inert gas to 1:1-3:100-200 as much as possible, especially the volume ratio of 1:2:150 is better.

[0069] Take 1g of nitrogen-doped carbon material and 3g of KOH and add water to mix it evenly, then dry it at 130°C, put the resulting mixture in a tube furnace and calcinate at 900°C for 2 hours in a nitrogen atmosphere, and wash the obtained nitrogen-doped porous carbon material with distilled water until neutral , dried at 100°C for later use.

[0070] Specific properties of the product: as tested, its specific surface area reaches 2170m 2 g -1...

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Abstract

The invention belongs to the field of biomass carbon material preparation and particularly discloses a process using date pits to prepare nitrogen-doped porous carbon material and a preparation method of a super-capacitor electrode. The process includes the steps of firstly, preprocessing the date pits; secondly, preparing nitrogen-doped carbon material; thirdly, preparing the nitrogen-doped porous carbon material. The process is characterized in that the date pits are used as the carbon source and mixed with ammonia gas and steam in inert protecting gas, the nitrogen doping reaction is performed during the carbonization process, activated perforation is performed under the effect of activating agent, and the nitrogen-doped porous carbon material with high specific surface area and pore volume is prepared. The preparation method is simple, low in cost, high in preparation efficiency and energy saving. Experiments show that the super-capacitor electrode prepared by the nitrogen-doped porous carbon material has high specific capacitance, ideal pseudo-capacitance and high circulation stability, the performance of the super-capacitor electrode is better than the performance of commercial activated-carbon super-capacitors, and the performance of the nitrogen-doped porous carbon material is better than that of most nitrogen-doped porous carbon materials.

Description

technical field [0001] The invention belongs to the field of preparation of biomass carbon materials, and in particular relates to a process for preparing nitrogen-doped porous carbon materials by using jujube seeds and a preparation method for supercapacitor electrodes. Background technique [0002] Activated carbon materials have a large number of pore structures and large specific surface areas, and have the characteristics of strong adsorption capacity, good stability of physical and chemical properties, and convenient regeneration after failure. They are widely used in supercapacitors, lithium batteries, gas adsorption and separation, and water purification. and other cutting-edge technology fields. But CO 2 Adsorption on pure carbon materials is physical adsorption, so CO 2 The adsorption capacity and selectivity are poor. At 25°C, the CO of commercial activated carbon 2 The adsorption capacity is only 0.89mmolg -1 , the CO of mesoporous CMK-3 2 The adsorption ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/10C01B31/12H01G11/34H01G11/44C01B32/336
CPCC01P2004/03C01P2006/12C01P2006/14C01P2006/17C01P2006/40H01G11/34H01G11/44Y02E60/13
Inventor 魏晓林魏同业杨利文肖化平张祺
Owner XIANGTAN UNIV
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