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Biomass-based grading porous carbon and preparation method thereof

A hierarchically porous, biomass technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve problems such as single action, irregular pre-carbonized material morphology, and carbon particles stacked into agglomerates, and achieve loose pore structure. , The effect of improving porosity and high specific surface area

Active Publication Date: 2019-03-26
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the simple use of hydrothermal method is likely to cause problems such as irregular morphology of pre-carbonized materials and stacking of carbon particles; moreover, existing technologies usually focus on improving the porosity of carbon in the subsequent activation process, and rarely propose improvements in the pre-carbonization stage. measure
Therefore, the hydrothermal method still has limitations as a means of pre-carbonization, and its role is relatively single.

Method used

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  • Biomass-based grading porous carbon and preparation method thereof
  • Biomass-based grading porous carbon and preparation method thereof
  • Biomass-based grading porous carbon and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0035] A preparation method of biomass-based hierarchical porous carbon in this embodiment, the specific preparation steps are as follows:

[0036] (1) Weigh 5 g of rice straw powder that has been sheared and sieved to 20 meshes, and mix the rice straw powder, double-salt system and water at a mass ratio of 1:5:10; among them, potassium chloride (KCl ) and sodium chloride (NaCl) system, the molar ratio of the two is 25:75. Put the above mixture into a high-temperature and high-pressure hydrothermal reactor, seal and heat to 180 °C, and react for 20 h under constant temperature stirring at 100 r / min; after the reaction is completed, cool to room temperature, and wash the solid product in the reactor with deionized water to medium properties, the washed product was dried at 80 °C for 24 h to obtain a pre-carbonized product;

[0037] (2) Weigh 1 g of the pre-carbonized product, mix the pre-carbonized product with potassium hydroxide (KOH) and silicon dioxide (SiO 2 ) was ground...

Embodiment 2

[0039] A preparation method of biomass-based hierarchical porous carbon in this embodiment, the specific preparation steps are as follows:

[0040] (1) Weigh 20 g of corn stalk powder that has been sheared and sieved to 30 meshes, and mix the corn stalk powder, double-salt system and water at a mass ratio of 1:1:1; among them, potassium chloride (KCl ) and zinc chloride (ZnCl 2 ) system, the molar ratio of the two is 40:60. Put the above mixture into a high-temperature and high-pressure hydrothermal reactor, seal and heat to 300 °C, and react for 5 h under constant temperature stirring at 200 r / min; after the reaction is completed, cool to room temperature, and wash the solid product in the reactor with deionized water to medium properties, the washed product was dried at 80 °C for 24 h to obtain a pre-carbonized product;

[0041] (2) Weigh 10 g of the pre-carbonized product, mix the pre-carbonized product with potassium oxalate (K 2 C 2 o 4 ) and calcium carbonate (CaCO ...

Embodiment 3

[0043] A preparation method of biomass-based hierarchical porous carbon in this embodiment, the specific preparation steps are as follows:

[0044] (1) Weigh 12 g of peanut shell powder that has been sheared and sieved to 50 mesh, and mix the peanut shell powder, double-salt system and water at a mass ratio of 1:5:1; among them, aluminum chloride (AlCl 3 ) and sodium chloride (NaCl) system, the molar ratio of the two is 25:75. Put the above mixture into a high-temperature and high-pressure hydrothermal reactor, seal and heat to 180 °C, and react for 20 h under constant temperature stirring at 100 r / min; after the reaction is completed, cool to room temperature, and wash the solid product in the reactor with deionized water to medium properties, the washed product was dried at 80 °C for 24 h to obtain a pre-carbonized product;

[0045] (2) Weigh 8 g of the pre-carbonized product, mix the pre-carbonized product with potassium bicarbonate (KHCO 3 ) and alumina (Al 2 o 3 ) was...

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Abstract

The invention discloses a biomass-based grading porous carbon and a preparation method thereof. The method comprises the following steps of shearing and sieving the biomass raw materials to 20 to 80 meshes; adding the materials into a double-salt system water solution; performing stirring; performing low-temperature hydro-thermal method pre-carbonization treatment for 5 to 20h at 180 to 300 DEG C;performing washing and filtering to obtain a pre-carbonization product; then raising the temperature to 600 to 1000 DEG C in inert atmosphere; performing carbonization activation treatment for 0.5 to8h; performing acid washing, alkali washing or ultrasonic treatment on the obtained product; then washing the materials by water to the neutral state; performing drying to obtain the biomass-based grading porous carbon. The hydrothermal carbonization is performed during the pre-carbonization; the double-salt system is used as a salt template and a pre-hole-forming agent; the adverse conditions are provided for the subsequent carbonization activation for preparing the porous carbon; the obtained porous carbon has high specific surface area and the loose three-dimensional connection pore passage structures; high electrical conductivity and good capacitive characters are realized; the biomass-based grading porous carbon can be applied to supercapacitors as carbon electrodes.

Description

technical field [0001] The invention belongs to the technical field of material science and energy chemical industry, and specifically relates to a biomass-based hierarchical porous carbon and a preparation method thereof. Background technique [0002] As a new type of energy storage device, supercapacitors have the advantages of high power density, high energy density, high specific capacitance, good cycle life, and good stability. application prospects. Among them, porous carbon materials are considered to be the most promising electrode materials for supercapacitors. [0003] Due to the characteristics of high chemical stability, large specific surface area, high porosity, adjustable pore size, good electrical conductivity, convenient regeneration after failure, low price, wide range of sources and environmental friendliness, porous carbon materials are widely used in adsorption, catalysis, transmission, and so on. Sensing, electrochemical energy storage and other field...

Claims

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Application Information

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IPC IPC(8): C01B32/324C01B32/348H01G11/24H01G11/44
CPCH01G11/24H01G11/44C01B32/324C01B32/348Y02E60/13
Inventor 罗继文李嘉明邓伟杰韦岚升吴泽琪黄曼妥顾孟媛
Owner SOUTH CHINA NORMAL UNIVERSITY
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