A process for preparing biomass porous nitrogen-doped carbon materials and a preparation method for supercapacitor electrodes

A supercapacitor, nitrogen-doped carbon technology, applied in the direction of hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, etc., can solve problems such as difficulties in large-scale promotion, achieve good electrochemical performance, be conducive to industrialization, and prepare methods simple effect

Active Publication Date: 2018-02-09
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the use of existing technologies to prepare biomass activated carbon energy storage materials for supercapacitors still has certain limitations, and it is difficult to promote them on a large scale.

Method used

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  • A process for preparing biomass porous nitrogen-doped carbon materials and a preparation method for supercapacitor electrodes
  • A process for preparing biomass porous nitrogen-doped carbon materials and a preparation method for supercapacitor electrodes
  • A process for preparing biomass porous nitrogen-doped carbon materials and a preparation method for supercapacitor electrodes

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Washing, drying and crushing the petals of camellia as a biomass raw material, passing through a 60-mesh sieve, and taking the part under the sieve. Weigh 2 g of the under-sieve portion and put it into a tube furnace for sintering at 800° C. for 2 hours under a mixed atmosphere of nitrogen, ammonia, carbon dioxide and water vapor.

[0042] The mixed gas is made of nitrogen at 300mL min -1 The flow rate was prepared by 75 °C, 1 M ammonium carbonate 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.

[0043] The prepared camellia petal-based porous nitrogen-doped carbon material was washed and dried. After testing, its specific surface area reaches 851m 2 g -1 , with a total pore volume of 0.68 cm 3 g -1 , nitrogen content 3%;

[0044] Mix acetylene black, polytetrafluoroethylene, and biomass porous nitrogen-doped carbon material in a ratio of 1:1:8...

Embodiment 2

[0052] Wash, dry and pulverize the leaves of the biomass raw material mulberry tree, pass through a 60-mesh sieve, and take the part under the sieve. Weigh 2 g of the under-sieve portion and put it into a tube furnace for sintering at 800° C. for 2 hours under a mixed atmosphere of nitrogen, ammonia, carbon dioxide and water vapor.

[0053] The mixed gas is made of nitrogen at 300mL min -1 The flow rate was prepared by a 75 °C, 1 M ammonium carbonate solution in water. 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.

[0054] Washing and drying the prepared mulberry leaf-based porous nitrogen-doped carbon material. After testing, its specific surface area reaches 760m 2 g -1 , with a total pore volume of 0.89 cm 3 g -1 .

[0055] Mix acetylene black, polytetrafluoroethylene, and biomass porous nitrogen-doped carbon material in a ratio of 1:1:8, add water to make...

Embodiment 3

[0058] Washing, drying and pulverizing the bark of the mulberry tree as a biomass raw material is passed through a 60-mesh sieve, and the part under the sieve is taken. Weigh 2 g of the under-sieve portion and put it into a tube furnace for sintering at 700° C. for 2 hours under a mixed atmosphere of nitrogen, ammonia, carbon dioxide and water vapor.

[0059] The mixed gas is made of nitrogen at 300mL min -1 The flow rate was prepared by a 75 °C, 1 M ammonium carbonate solution in water. 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.

[0060] The obtained mulberry bark-based porous nitrogen-doped carbon material was washed and dried. After testing, its specific surface area reaches 522m 2 g -1 , with a total pore volume of 0.31 cm 3 g -1 ;

[0061] Mix acetylene black, polytetrafluoroethylene, and biomass porous nitrogen-doped carbon material in a ratio of 1:1...

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Abstract

The invention belongs to the field of preparation of biomass carbon materials, and specifically discloses a process for preparing biomass porous nitrogen-doped carbon materials and a method for preparing supercapacitor electrodes. The process includes the following steps: (1) pretreatment of raw materials; 2) Preparation of biomass porous nitrogen-doped carbon material: put the pretreated biomass raw material into the reactor, pass a mixed gas containing ammonia, water vapor and inert gas, and maintain the temperature at 700-900°C , Continuous reaction 1 ~ 3h. The invention realizes the above-mentioned technical purpose in one step by one-time heating, and has simple preparation method, low cost, high production efficiency and energy saving. The biomass porous nitrogen-doped carbon material prepared by the invention has a specific surface area of ​​900-1600m2g-1, a total pore volume of 0.4-0.9m3g-1, a nitrogen content of 0.9-3%, and excellent electrochemical properties.

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 biomass porous nitrogen-doped carbon materials and a preparation method of 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, stable physical and chemical properties, and convenient regeneration after failure, and are widely used in frontiers such as supercapacitors, lithium batteries, gas adsorption and separation, and water purification. technology field. The introduction of heteroatoms, such as B, N, P, or O, into porous carbon materials can significantly improve their mechanical, electrical, or electrochemical properties. In particular, the N element can partially replace the C element, causing many dislocations, bending, dislocation and other defects wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/44H01G11/38H01G11/86
CPCY02E60/13
Inventor 魏晓林魏同业肖化平杨利文张祺
Owner XIANGTAN UNIV
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