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Preparation method and application of nitrogen-doped peel based porous carbon material

A nitrogen doping and peeling technology, applied in chemical instruments and methods, manufacturing of hybrid/electric double layer capacitors, inorganic chemistry, etc., can solve the problems of decreased electric double layer capacitance, loss of material specific surface area, etc., and achieve a suitable pore size distribution. , low cost and high cycle stability

Active Publication Date: 2019-03-29
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although a lot of research has been done on nitrogen-doped carbon materials through different methods, the specific surface area of ​​the material is often lost due to the nitrogen doping step in the preparation process, which further leads to a decrease in the electric double layer capacitance.
In addition, many of these preparation methods use strong acid-base or toxic activators, which far outweigh the benefits for actual production and environmental protection.

Method used

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  • Preparation method and application of nitrogen-doped peel based porous carbon material
  • Preparation method and application of nitrogen-doped peel based porous carbon material
  • Preparation method and application of nitrogen-doped peel based porous carbon material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] After peeling the peel, cleaning and drying, weigh 3 g of peel and 0.5 g of melamine and mix it in a small beaker, add deionized water, put it into an ultrasonic cell pulverizer, and use an ultrasonic probe for processing (power 300 W, interval 2 s work, the treatment time is 15 min) to obtain a viscous mixture. After drying for 8 h, under nitrogen atmosphere, the temperature was raised to 400 °C at 2 °C / min, kept for 2 h, and cooled to room temperature to obtain nitrogen-doped peel base carbon; the nitrogen-doped peel-based carbon and the activator potassium bicarbonate were treated with a ball mill for 30 min in a mass ratio of 1:5 (300 rpm, forward rotation 15 min, reverse rotation 15 min), and the obtained mixture was placed in In a tube furnace, under a nitrogen atmosphere, the temperature was raised to 850 °C at 5 °C / min, kept for 2 h, cooled to room temperature, and 1 mol L -1 Wash with hydrochloric acid at 50°C for 2 h, wash with water until neutral, and then d...

Embodiment 2

[0031] After peeling, cleaning, and drying the peel, weigh 3 g of peel and 1 g of melamine and mix them in a small beaker, add deionized water, put them into an ultrasonic cell pulverizer, and use an ultrasonic probe for processing (power 300 W, interval 2 s work, the treatment time is 15 min) to obtain a viscous mixture. After drying for 8 h, under nitrogen atmosphere, the temperature was raised to 400 °C at 2 °C / min, kept for 2 h, cooled to room temperature, and nitrogen-doped peel was obtained. base carbon; nitrogen-doped fruit peel-based carbon and activator potassium bicarbonate were treated with a ball mill for 30 min (300 rpm, forward rotation 15 min, reverse rotation 15 min) at a mass ratio of 1:5, and the resulting mixture was placed in In a tube furnace, under a nitrogen atmosphere, the temperature was raised to 850 °C at 5 °C / min, kept for 2 h, cooled to room temperature, and 1 mol L -1 Pickling with hydrochloric acid for 2 h, washing with water until neutral, and ...

Embodiment 3

[0033] After peeling, cleaning, and drying the peel, weigh 3 g of peel and 2 g of melamine and mix them in a small beaker, add deionized water, put them into an ultrasonic cell pulverizer, and use an ultrasonic probe for processing (power 300 W, interval 2 s work, the treatment time is 15 min) to obtain a viscous mixture. After drying for 8 h, under nitrogen atmosphere, the temperature was raised to 400 °C at 2 °C / min, kept for 2 h, cooled to room temperature, and nitrogen-doped peel was obtained. base carbon; nitrogen-doped fruit peel-based carbon and activator potassium bicarbonate were treated with a ball mill for 30 min (300 rpm, forward rotation 15 min, reverse rotation 15 min) at a mass ratio of 1:5, and the resulting mixture was placed in In a tube furnace, under a nitrogen atmosphere, the temperature was raised to 850 °C at 5 °C / min, kept for 2 h, cooled to room temperature, and 1 mol L -1 Pickling with hydrochloric acid for 2 h, washing with water until neutral, and ...

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Abstract

The invention discloses a preparation method and application of a nitrogen-doped peel based porous carbon material. According to the method, waste peel is used as biomass raw materials; through an ultrasound method, the waste peel and a nitrogen source are pretreated; at low-temperature, the materials are pre-carbonized into nitrogen-doped peel based carbon; then, potassium bicarbonate is used asan activating agent for activation at high temperature; finally, through treatments of acid washing, water washing, drying and the like, the preparation of a nitrogen-doped peel based porous carbon super capacitor electrode material with high specific surface area, good pore diameter distribution and certain nitrogen content is realized. The prepared super capacitor material has excellent electrochemical performance which is shown in aspects of high specific capacitance, high energy density, good circulation stability and the like. In addition, the method does not relate to the use of strong basic or strong acidic or toxic activating agents; the preparation method is low in cost and achieves the environment-friendly effects.

Description

technical field [0001] The invention relates to a nitrogen-doped peel-based supercapacitor material and a preparation method thereof, in particular to a nitrogen-doped peel-based electrode material and a preparation method and application thereof, belonging to the field of new energy materials. Background technique [0002] A supercapacitor is an energy storage device that not only relies on the adsorption and desorption of charges on the electric double layer to achieve charge and discharge, but also generates Faradaic current through the redox species at the electrode / solution interface, that is, the pseudocapacitive effect. Supercapacitors have the advantages of fast charge and discharge, high power density, good cycle life, wide operating temperature, and low cost. [0003] An important factor affecting the function of a capacitor is the nature of the electrode material. The electrode materials of supercapacitors mainly include carbon materials, metal oxide materials, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/324C01B32/348H01G11/30H01G11/34H01G11/42H01G11/44H01G11/24H01G11/84H01G11/86
CPCC01B32/324C01B32/348H01G11/24H01G11/30H01G11/34H01G11/42H01G11/44H01G11/84H01G11/86Y02E60/13
Inventor 徐朗白沛瑶魏仕林娄孝贤沈耿亮
Owner CHINA UNIV OF MINING & TECH
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