Preparation method and application method of nitrogen-doped porous carbon based on straw hydrothermal carbonization

A technology of hydrothermal carbonization and nitrogen doping, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of waste of biological resources, air pollution, etc., and achieve renewable cost, high specific capacitance, and high value effect of chemical utilization

Pending Publication Date: 2020-04-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is reported that China produces about 270 million tons of rice straw waste every year, but 30% of them are treated by direct incineration, causing serious waste of biological resources and air pollution

Method used

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  • Preparation method and application method of nitrogen-doped porous carbon based on straw hydrothermal carbonization
  • Preparation method and application method of nitrogen-doped porous carbon based on straw hydrothermal carbonization
  • Preparation method and application method of nitrogen-doped porous carbon based on straw hydrothermal carbonization

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Embodiment 1

[0037]The raw rice straw was pulverized by a turbine grinder, passed through a 40-mesh standard sieve, and then dried in a blast drying oven at 105°C for 12 hours. Soak 50g of crushed straw raw material in 500ml of ionized water, ultrasonicate at room temperature for 1h, then seal it in a high-temperature and high-pressure reaction kettle with a quartz lining, heat it to 240°C, keep it warm for 4h, and the stirring speed during the hydrothermal reaction process is 100r / min. Naturally cool to room temperature after the reaction is completed, filter with suction, wash with absolute ethanol and ultrapure water to remove impurities, and dry at 105°C for 12 hours to obtain brown-black straw hydrothermal charcoal. The straw hydrothermal charcoal, potassium bicarbonate and melamine are mixed in a mass ratio of 1:6:1 and then fully ground in a mortar. The obtained mixture was placed in a tube furnace, and the temperature was raised to 850° C. at a rate of 5° C. / min under a nitrogen ...

Embodiment 2

[0045] The raw rice straw was pulverized by a turbine grinder, passed through a 40-mesh standard sieve, and then dried in a blast drying oven at 105°C for 12 hours. Soak 50g of crushed straw raw material in 750ml of ionized water, ultrasonicate at room temperature for 1h, then seal it in a high-temperature and high-pressure reaction kettle with a quartz lining, heat it to 240°C, keep it warm for 4h, and the stirring speed during the hydrothermal reaction is 100r / min. Naturally cool to room temperature after the reaction is completed, filter with suction, wash with absolute ethanol and ultrapure water to remove impurities, and dry at 105°C for 12 hours to obtain brown-black straw hydrothermal charcoal. The straw hydrothermal charcoal, potassium bicarbonate and melamine are mixed in a mass ratio of 1:6:1 and then fully ground in a mortar. The obtained mixture was placed in a tube furnace, and the temperature was raised to 850° C. at a rate of 5° C. / min under a nitrogen atmosph...

Embodiment 3

[0047] The raw rice straw was pulverized by a turbine grinder, passed through a 40-mesh standard sieve, and then dried in a blast drying oven at 105°C for 12 hours. Soak 50g of crushed straw raw material in 500ml of ionized water, ultrasonicate at room temperature for 1h, then seal it in a high-temperature and high-pressure reactor with a quartz lining, heat it to 220°C, keep it warm for 4h, and the stirring speed during the hydrothermal reaction process is 100r / min. Naturally cool to room temperature after the reaction is completed, filter with suction, wash with absolute ethanol and ultrapure water to remove impurities, and dry at 105°C for 12 hours to obtain brown-black straw hydrothermal charcoal. The straw hydrothermal charcoal, potassium bicarbonate and melamine are mixed in a mass ratio of 1:6:1 and then fully ground in a mortar. The obtained mixture was placed in a tube furnace, and the temperature was raised to 850° C. at a rate of 5° C. / min under a nitrogen atmosph...

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Abstract

The invention provides a preparation method and an application method of nitrogen-doped porous carbon based on straw hydrothermal carbonization. The preparation method comprises the following steps: 1, crushing a biomass raw material rice straw, screening, and drying in a 105 DEG C blast drying oven for 12 hours; 2, carrying out hydrothermal treatment on the crushed rice straw, naturally cooling to room temperature after the reaction is finished, carrying out suction filtration, washing with absolute ethyl alcohol and ultrapure water to remove impurities, and drying to obtain brownish black straw hydrothermal carbon; 3, mixing the straw hydrothermal carbon, an activating agent and melamine according to a certain mass ratio, and fully grinding in a mortar; and 4, putting the ground mixtureinto a tubular furnace, carrying out high-temperature activation in an inert gas atmosphere, naturally cooling to room temperature, and carrying out acid washing, water washing and drying on the obtained material to obtain the nitrogen-doped straw hydrothermal carbon-based porous carbon for the supercapacitor. The method comprises the following steps: A, a working electrode preparation method; andB, a supercapacitor preparation method.

Description

technical field [0001] The invention relates to the field of preparation of biomass carbon materials and the technical application of new energy storage devices such as supercapacitors and batteries, in particular to a preparation and application method of nitrogen-doped porous carbon based on straw hydrothermal carbonization. Background technique [0002] Supercapacitor (SC), as one of the powerful and advanced energy storage systems, has the advantages of high power density, fast charge and discharge rate, long cycle life, high current efficiency, wide operating temperature range, environmental protection and high safety performance, making up for the The energy storage gap between batteries and traditional capacitors has been widely used in electric vehicles, communication equipment, portable devices, stationary energy storage and other fields. SCs are mainly composed of current collectors, electrodes, electrolytes, and separators, among which electrodes, as one of the im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/324H01G11/44H01G11/34
CPCC01B32/348C01B32/324H01G11/44H01G11/34Y02E60/13
Inventor 盛奎川徐增华张玺铭林宏建钱湘群
Owner ZHEJIANG UNIV
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