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A preparation method of biomass-based nitrogen-containing porous carbon, porous carbon and its application

A biomass and porous carbon technology, which is applied in the preparation/purification of carbon, chemical instruments and methods, carbon compounds, etc., can solve the problems of large amount of use, complicated synthesis process, and high cost, and achieve high rate performance, environmental friendliness, The effect of easy operation

Active Publication Date: 2018-12-11
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The commonly used preparation method is mainly based on chemical activation method, which has the problems of complex synthesis process, high cost, and the need to use a large amount of chemical reagents such as strong acid and strong base.

Method used

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  • A preparation method of biomass-based nitrogen-containing porous carbon, porous carbon and its application
  • A preparation method of biomass-based nitrogen-containing porous carbon, porous carbon and its application
  • A preparation method of biomass-based nitrogen-containing porous carbon, porous carbon and its application

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preparation example Construction

[0030] The preparation method of the nitrogen-doped porous carbon material according to the present invention is a hydrothermal method, and the porous nitrogen-doped carbon material synthesized by this method has a large specific surface area and abundant micro-mesoporous structure. The method uses renewable protein-rich biomass as raw material, without adding nitrogen source, to prepare nitrogen-doped porous carbon material in situ in one step, and the porous nitrogen-containing material has excellent electric double layer capacitance performance and good cycle stability.

[0031] Alkali is used as an activator in the chemical activation method of the prior art, but in order to make the final activated carbon product have sufficient micropore or mesoporous structure, it is often necessary to use a large amount of alkali as an activator, and the activator is usually doubled, or even several times the amount of biomass raw material. In comparison, the present invention adopts ...

Embodiment 1

[0037] 1 kg of cleaned bamboo shoots was cut into pieces, heated to dryness in an oven at 70° C., and the obtained solid was ground into powder. Take 2g of powder and add it to 20mL of dilute sulfuric acid with a weight percentage of 0.5%, stir and mix evenly, then move to a hydrothermal reaction kettle, react at 210°C for 12 hours, filter, wash, and dry to obtain a brown solid. Afterwards, the obtained dried solid was calcined in a tube furnace in a nitrogen gas atmosphere, and kept at 800° C. for 8 hours. After the tube furnace dropped to room temperature, the sample was taken out to obtain a nitrogen-doped porous carbon material with a nitrogen content of about 2.9% and a specific surface area of ​​1893m 2 / g. figure 1 and figure 2 It is the BET and SEM result figure of the nitrogen-doped porous carbon material prepared according to the present embodiment, such as figure 1 and figure 2 As shown by the data, the material contains a well-developed micro- and meso-porous...

Embodiment 2

[0039] 1 kg of cleaned bamboo shoots was cut into pieces, heated to dryness in an oven at 70° C., and the obtained solid was ground into powder. Take 2g of powder and add it to 20mL of water (without adding acid), stir and mix evenly, then move to a hydrothermal reaction kettle, react at 210°C for 12 hours, filter, wash, and dry to obtain a brown solid. Afterwards, the obtained dried solid was calcined in a tube furnace in a nitrogen gas atmosphere, and kept at 900° C. for 8 hours. After the tube furnace dropped to room temperature, the sample was taken out to obtain a nitrogen-doped porous carbon material with a specific surface area of ​​935m 2 / g, the nitrogen content is 1.7%.

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Abstract

The invention discloses a preparation method of biomass-based nitrogenous porous carbon, the porous carbon prepared by the method and the use of the prepared nitrogenous porous carbon in a super capacitor. The preparation method comprises the steps of (1) drying a biomass material, and grinding the biomass material into fine powders, (2) evenly mixing the biomass material powders and water or a dilute acid solution, (3) placing the above mixture into a reactor for hydrothermal reaction, and (4) drying and grinding an obtained hydrothermal reaction product, and calcining the hydrothermal reaction product in a tube furnace to obtain a nitrogen-doped porous carbon material with a large surface area. According to the method of the invention, cheap and renewable plant is used as carbon and nitrogen precursors, and the porous nitrogen-doped carbon material is prepared through a hydrothermal method. The method has the advantages of simple preparation process, no need of an activator or template agent, low cost, environmental protection, and convenient operation, problems of strong corrosion, a high price of transition metal and environmental pollution caused by heavy metal are avoided, and the method is suitable for mass production.

Description

technical field [0001] The invention belongs to the field of inorganic nanometer materials, in particular to a nitrogen-doped porous carbon material based on biomass raw materials for supercapacitors. Background technique [0002] Supercapacitor is a green and environmentally friendly energy storage device, which has the advantages of high power density, short charge and discharge time, long cycle life and wide operating temperature range. It has important application value in the fields of transportation, electronic products and wind power storage. At present, the key problem limiting the application of supercapacitors is the low energy density of supercapacitors. The energy storage density of commercialized supercapacitors is only 5-10Wh / kg, which is far lower than the 120-170Wh / kg of lithium-ion batteries. According to the supercapacitor energy density formula It can be seen that the energy density of supercapacitors can be improved by increasing the specific capacitanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/44C01B32/05C01B32/318
CPCY02E60/13
Inventor 陈秀芳费本华牟新东张波张俊逸
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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