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Nitrogen-doped porous graphene and preparation method thereof

A technology of porous graphene and nitrogen doping, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as harsh reaction conditions, poor material performance, complex synthesis process, etc., and achieve higher decomposition temperature and stronger Effects of dispersion and half-wave potential improvement

Pending Publication Date: 2019-12-24
浙江晨阳新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods require high equipment, harsh reaction conditions, complex synthesis process, low yield, and poor performance of the obtained materials

Method used

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  • Nitrogen-doped porous graphene and preparation method thereof
  • Nitrogen-doped porous graphene and preparation method thereof
  • Nitrogen-doped porous graphene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Graphene oxide adopts the improved Hummer's method, that is, take 1g of graphite powder, 0.5g of sodium nitrate and add 23ml of concentrated sulfuric acid, place them in an ice bath environment and mix them mechanically. Then 3 g of potassium permanganate was added and stirred for 2 hours, during which the temperature of the reaction system was kept not higher than 20°C. When the reaction system returns to room temperature, slowly add 70mL of deionized water to the reaction system to oxidize and expand the graphite. The reaction is carried out for 0.5h, then continue to add 70mL of deionized water for dilution, and then slowly add 20mL of 30% hydrogen peroxide until the reaction system Change color and finally cool to room temperature. Add 2L of 5% dilute hydrochloric acid to the above reaction system for dilution, dissolve the remaining undissolved manganese dioxide, and then filter. Afterwards, rinse with deionized water and centrifuge to remove acid until the pH of ...

Embodiment 2

[0050] Graphene oxide adopts the improved Hummer's method, that is, take 1g of graphite powder, 1g of sodium nitrate and add 25ml of concentrated sulfuric acid and place them in an ice bath environment for mechanical mixing. Then 4 g of potassium permanganate was added and stirred for 8 hours, during which the temperature of the reaction system was kept not higher than 20°C. When the reaction system returns to room temperature, slowly add 100mL deionized water to the reaction system to oxidize and expand the graphite. The reaction is carried out for 2h, then continue to add 100mL deionized water for dilution, and then slowly add 20mL 30% hydrogen peroxide until the reaction system changes color. , and finally cooled to room temperature. Add 3L of 5% dilute hydrochloric acid to the above reaction system for dilution, dissolve the remaining undissolved manganese dioxide, and then filter. Afterwards, rinse with deionized water and centrifuge to remove acid until the pH of the re...

Embodiment 3

[0054] Graphene oxide adopts the improved Hummer's method, that is, take 1g of graphite powder, 0.3g of sodium nitrate and add 20ml of concentrated sulfuric acid, place them in an ice bath environment and mix them mechanically. Then 5 g of potassium permanganate was added and stirred for 1 hour, during which the temperature of the reaction system was kept not higher than 20°C. When the reaction system returns to room temperature, slowly add 40 mL of deionized water to the reaction system to oxidize and expand the graphite. The reaction is carried out for 1 hour, then continue to add 40 mL of deionized water for dilution, and then slowly add 30 mL of 30% hydrogen peroxide until the reaction system changes color. , and finally cooled to room temperature. Add 400 mL of 5% dilute hydrochloric acid to the above reaction system for dilution, dissolve the remaining undissolved manganese dioxide, and then filter. Afterwards, rinse with deionized water and centrifuge to remove acid un...

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Abstract

The invention discloses nitrogen-doped porous graphene and a preparation method thereof. The method comprises the following steps: preparing a graphene oxide dispersion liquid; diluting the graphene oxide dispersion liquid, adding hydrogen peroxide, performing uniform stirring, and continuously adding a nitrogen-containing polymer monomer for a hydrothermal reaction so as to obtain porous graphene-polymer gel; and washing and drying the porous graphene-polymer gel, carrying out a high-temperature reaction in an inert gas atmosphere, and cooling the reaction product to obtain the nitrogen-dopedporous graphene. The preparation process is simple, the cost of required raw materials is low, the yield is high, and industrial production is easy to realize. The obtained material has very high oxidation-reduction catalytic activity as a catalyst, and can be applied to fuel cells and other related fields.

Description

technical field [0001] The invention belongs to the technical field of graphene catalytic materials, and in particular relates to a nitrogen-doped porous graphene and a preparation method thereof. Background technique [0002] Fuel cell is a new energy technology that directly converts the chemical energy of fuel into electric energy in an efficient and environmentally friendly manner. extensive attention. Two prominent problems restricting the development of fuel cells are high cost and short life, and one of the key factors leading to these two problems is electrocatalyst. In the past, platinum or platinum alloys were the most used catalysts in commercial fuel cells, but the lack of platinum resources, high price, and poor toxicity resistance limit its application in proton exchange membrane fuel cells. Therefore, the development of low-cost, high-activity catalysts to replace platinum-carbon catalysts is considered to be the best way to reduce the cost of fuel cells and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/198H01M4/88H01M4/90
CPCC01B32/184C01B32/198H01M4/9091H01M4/8825C01B2204/32C01B2204/20Y02E60/50
Inventor 陈忠伟余爱萍毛治宇
Owner 浙江晨阳新材料有限公司
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