A process for preparing nitrogen-doped porous carbon material using jujube core and a preparation method for supercapacitor electrodes

A nitrogen-doped porous carbon, supercapacitor technology, applied in hybrid capacitor electrodes, chemical instruments and methods, carbon compounds, etc. It is beneficial to industrialization, low cost, and the effect of improving adsorption performance and capacitance performance

Active Publication Date: 2017-10-13
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A process for preparing nitrogen-doped porous carbon material using jujube core and a preparation method for supercapacitor electrodes
  • A process for preparing nitrogen-doped porous carbon material using jujube core and a preparation method for supercapacitor electrodes
  • A process for preparing nitrogen-doped porous carbon material using jujube core and a preparation method for supercapacitor electrodes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0049] The gas mixture was prepared by passing nitrogen gas through a 75°C, 1M ammonium nitrate solution at a flow rate of 300 mL / min. It is better to control the volume ratio of the ammonia gas, water vapor and inert gas to 1:1-3:100-200, especially the volume ratio of 1:2:150.

[0050] Take 1 g of nitrogen-doped carbon material and 3 g of KOH, add water and mix them evenly, then dry at 130 °C, put the resulting mixture into a tube furnace and calcine at 800 °C for 2 hours in a nitrogen environment, and wash the obtained nitrogen-doped porous carbon material with distilled water to medium properties, 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...

Embodiment 2

[0060] The jujube pits were washed and dried, and 10 g of the crushed jujube pits were weighed, put into a porcelain crucible, and carbonized at 600° C. for 2 hours in a mixed gas of nitrogen, ammonia and water vapor to obtain nitrogen-doped carbon materials.

[0061] The gas mixture was prepared by passing nitrogen gas through a 75°C, 1M ammonium nitrate solution at a flow rate of 300 mL / min. It is better to control the volume ratio of the ammonia gas, water vapor and inert gas to 1:1-3:100-200, especially the volume ratio of 1:2:150.

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

[0063] After testing, its specific surface area reaches 2400m 2 g -1 , the total po...

Embodiment 3

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

[0068] The gas mixture was prepared by passing nitrogen gas through a 75°C, 1M ammonium nitrate solution at a flow rate of 300 mL / min. It is better to control the volume ratio of the ammonia gas, water vapor and inert gas to 1:1-3:100-200, especially the volume ratio of 1:2:150.

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

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

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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, in particular 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 a huge specific surface area, and have the characteristics of strong adsorption capacity, good physical and chemical performance stability, 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 belongs to physical adsorption, so CO 2 The adsorption capacity and selectivity are poor. At 25°C, the CO of commercial activated carbon 2 The adsorption amount is only 0.89mmol g -1 , CO of mesoporous CMK-3 2 The adsorption amount is als...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/324C01B32/348C01B32/336H01G11/34H01G11/44
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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