Porous carbon material and preparation method and application thereof

A technology of porous carbon and raw materials, which is applied in the preparation/purification of carbon, capacitors, structural parts, etc., can solve the problems of waste, pollution of environmental resources, etc., and achieve the effects of low cost, high specific surface area, and simple process

Inactive Publication Date: 2013-12-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A large number of shrimp shells and crab shells are discarded as garbage, which not only pollutes the environment but also causes a waste of resources

Method used

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  • Porous carbon material and preparation method and application thereof
  • Porous carbon material and preparation method and application thereof
  • Porous carbon material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The cleaned crab shells were dried in an oven at 110°C, and then under the protection of nitrogen, the temperature was raised to 400°C in a tube furnace at a rate of 3°C / min and kept for 2 hours for pre-carbonization to obtain the precursor; the precursor Mix evenly with potassium hydroxide at a mass ratio of 1:1, raise the temperature to 900°C at a rate of 3°C / min in a tube furnace under nitrogen protection, and keep it for 1h. The above product was naturally cooled to room temperature under the protection of nitrogen, washed with 2mol / L HCl to remove the inorganic components, then washed with deionized water at 100°C until neutral, and dried at 120°C for 12h to obtain a porous carbon material. The BET specific surface area test method is used to test the porous carbon material, and its BET specific surface area reaches 3023m 2 / g, total pore volume 2.71cm 3 / g, adopting X-ray energy spectrum to measure its nitrogen element content is 0wt%. The pores are three-dimens...

Embodiment 2

[0031] Pre-carbonization is the same as in Example 1. The precursor and potassium hydroxide were uniformly mixed at a mass ratio of 1:0.5, then the temperature was raised to 900 °C at a rate of 3 °C / min under the protection of nitrogen, and kept for 1 h, and then naturally cooled to room temperature under the protection of nitrogen. The resulting product was treated with 2mol / L of HNO 3 Remove the inorganic components therein, wash with deionized water at 100°C until neutral, and dry at 120°C for 12 hours to obtain a porous carbon material. The BET specific surface area of ​​the above porous carbon material is 2623m 2 / g, the total pore volume is 2.37cm 3 The porous carbon material of the three-dimensional pore distribution of / g adopts X-ray energy spectrum to measure its nitrogen content to be 0wt%.

Embodiment 3

[0033] Pre-carbonization is the same as in Example 1. The precursor and potassium hydroxide were uniformly mixed at a mass ratio of 1:1, then the temperature was raised to 600 °C at a rate of 3 °C / min under the protection of nitrogen, and kept for 1 h, and then naturally cooled to room temperature under the protection of nitrogen. Then the resulting product was treated with 2mol / L HNO 3 The inorganic components were removed, washed with deionized water at 100°C until neutral, and dried at 120°C for 12 hours to obtain a nitrogen-containing porous carbon material. The BET specific surface area of ​​the above porous carbon material is 1158m 2 / g, the total pore volume is 0.91cm 3 / g of porous carbon material with three-dimensional pore distribution, and its nitrogen content is 6.79wt% as measured by X-ray energy spectroscopy.

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Abstract

The invention relates to a porous carbon material and a preparation method and application thereof. Organic and inorganic materials in shrimp shell and crab shell are used as carbon sources and natural templates, meanwhile the pore formation effect of template structures during high temperature decomposition is utilized, and a proper activator is mixed to produce the porous carbon material. The difficulties of methods those in the prior art in a preparation process, preparation of templates is needed, carbon precursors need to be soak in the templates, and the like, are overcome; and the nitrogen-containing carbon material with multistage pore structures is prepared by using the characteristic that the carbon sources themselves contain nitrogen element. The preparation method of the porous carbon material is simple, is low in cost, is strong in process controllability, and is suitable for industrial production, the porous carbon material shows very good application effects in electrochemical capacitors and secondary cells, and the porous carbon material not only provides a new material for the new energy, but also opens up a new way for the effective use of waste, namely the shrimp shell and crab shell in aquatic products industry.

Description

Technical field: [0001] The invention relates to a porous carbon material and its preparation method and application. It specifically involves the use of biological natural templates and the use of templates that can be decomposed at high temperatures to create pores, and at the same time properly prepare porous carbon materials with activators, the porous carbon materials prepared by this method, and the prepared porous carbon materials in secondary batteries and capacitors Applications. Background technique: [0002] Due to the advantages of high temperature resistance, acid and alkali resistance, electrical conductivity, and thermal conductivity, porous carbon materials have attracted people's close attention. Fuel cells and many other fields. With the continuous expansion of the application fields of porous carbon materials, people have higher and higher requirements for the structure and performance of porous carbon materials. Therefore, the selection of suitable carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02H01M4/133H01G9/042C01B32/05
CPCY02E60/122Y02E60/10Y02E60/13
Inventor 黄雅钦蒋嗣颖李承明魏少臣高梦瑶王维坤张浩
Owner BEIJING UNIV OF CHEM TECH
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