CN114804069A - Method for preparing nitrogen-doped porous carbon material by gas-phase stripping of lignin and application - Google Patents

Method for preparing nitrogen-doped porous carbon material by gas-phase stripping of lignin and application Download PDF

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CN114804069A
CN114804069A CN202210554421.3A CN202210554421A CN114804069A CN 114804069 A CN114804069 A CN 114804069A CN 202210554421 A CN202210554421 A CN 202210554421A CN 114804069 A CN114804069 A CN 114804069A
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nitrogen
carbon material
porous carbon
doped porous
lignin
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黄步军
蒋军成
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Nanjing Tech University
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Nanjing Tech University
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    • C01B32/00Carbon; Compounds thereof
    • C01B32/05Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/86Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/88Processes of manufacture
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/86Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/90Selection of catalytic material

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Abstract

The invention provides a method for preparing a nitrogen-doped porous carbon material by stripping lignin in a gas phase and application, wherein the preparation method comprises the following steps: the method comprises the steps of taking alkali lignin and a gas-phase stripping auxiliary agent as raw materials, performing blending ball milling, performing pyrolysis in an inert gas atmosphere, and performing thermal decomposition on the gas-phase stripping auxiliary agent, etching the lignin and performing dehydroxylation to obtain the nitrogen-doped porous carbon material. The raw materials for preparing the material have wide sources and low cost, and the cost can be reduced to a greater extent. Meanwhile, the technical route is simple, the nitrogen-doped porous carbon material is obtained through one-step reaction, and the preparation process is convenient. The nitrogen-doped porous carbon material can be obtained only by simple washing and drying treatment after the reaction is finished, and the material is applied to the field of electrocatalysis and has higher catalytic activity.

Description

Method for preparing nitrogen-doped porous carbon material by gas-phase stripping of lignin and application
Technical Field
The invention relates to the field of electrochemistry, and particularly relates to a method for preparing a nitrogen-doped porous carbon material by gas-phase stripping of lignin and application of the nitrogen-doped porous carbon material.
Background
In the current situation of large energy consumption at present, the non-regenerability and high pollution of the traditional fossil fuel do not meet the requirements of sustainable development of human society. Therefore, a series of new energy utilization devices, such as: fuel cells, metal-air cells and water splitting systems, which are green, clean, high capacity and renewable, are considered to be promising alternatives to traditional fossil fuels. Among them, Oxygen Reduction Reaction (ORR) and Oxygen Evolution Reaction (OER) play a crucial role in this kind of advanced energy storage and conversion device. However, the precious metal materials (Pt, Ru, Ir) have proven to be excellent electrocatalysts, but due to their high price and scarce current storage, poor durability and poor resistance to methanol cross-effects, the large-scale application of these catalysts is limited, which also affects the development of new energy devices.
In recent years, researchers have been devoted to research on non-noble metal platinum catalysts and have proposed a number of alternative materials, such as carbides, transition metal oxides, metal sulfides, and the like. The porous carbon material has the advantages of high specific surface area, strong conductive capability, good thermal stability and chemical stability and the like, and is considered to be a good material for replacing the traditional noble metal electrocatalyst. The mesoporous graphitized carbon material has high specific surface area and porous structure, and the carbon material doped with heteroatoms (N, P, S or B) has the characteristics of low cost, high activity, high stability and the like. Therefore, how to design a convenient technical synthesis route and prepare a high-performance electrocatalyst becomes a hotspot of extensive research of researchers.
Therefore, the invention provides a method for preparing a nitrogen-doped porous carbon material based on a gas phase stripping method, which comprises the following steps: the nitrogen-doped porous carbon material is obtained by taking lignin as a carbon source and blending and pyrolyzing the lignin and a gas phase stripping aid. The method has the advantages of wide raw material source, low cost and capability of reducing the cost to a greater extent. Meanwhile, the technical route is simple, and the preparation method is convenient. The obtained nitrogen-doped porous carbon material can be applied to the field of electrocatalysis, can be used as a negative electrode material for preparing a zinc-air battery, and has the performance equivalent to that of a noble metal catalyst.
Disclosure of Invention
The invention aims to provide a method for preparing a nitrogen-doped porous carbon material by gas-phase stripping of lignin and application thereof, which have the advantages of wide raw material source, low cost and capability of reducing the cost to a greater extent. Meanwhile, the technical route is simple, the nitrogen-doped porous carbon material is obtained through one-step reaction, and the preparation process is convenient. The nitrogen-doped porous carbon material can be obtained only by simple washing and drying treatment after the reaction is finished, and the material is applied to the field of electrocatalysis and has higher catalytic activity and considerable application prospect.
The technical scheme of the invention is as follows: a method for preparing a nitrogen-doped porous carbon material by stripping lignin in a gas phase comprises the following steps:
mixing lignin and a gas phase stripping auxiliary agent, putting the mixture into a ball milling tank, carrying out ball milling for 24 hours at the rotating speed of 300r/min, transferring the mixture into a tubular furnace, and heating and carbonizing the mixture by stages; and after carbonization is finished, adding hydrochloric acid into the obtained porous carbon material, stirring and washing, washing with deionized water, performing centrifugal precipitation, and drying to obtain the nitrogen-doped porous carbon material.
Further, the lignin is alkali lignin washed with deionized water.
Further, the gas phase stripping aid comprises Zn 2+ Salts and nitrogen-containing compounds.
Further, the nitrogen-containing compound is NH 4 Cl, melamine or carbon nitride; said Zn 2+ The salt being ZnCl 2 、ZnC 2 O 4 Or ZnCO 3
Further, lignin, nitrogen-containing compound, Zn are used 2+ The mass ratio of the salt is 1:4-6: 1.
The rotation speed of the ball milling is 300r/min, and the reaction time of the ball milling is 24 h.
Further, during carbonization, inert gas is used as nitrogen or argon, the temperature is raised to 350 ℃ at the speed of 1 ℃/min in stages, and the temperature is kept for 3 hours; then the temperature is raised to 800 ℃ at the speed of 1 ℃/min, and the temperature is kept for 3 h.
Further, the hydrochloric acid concentration for washing the porous carbon material is 2mol/L, the stirring time is 12h, and then the porous carbon material is washed by deionized water and then centrifugally dried to obtain the nitrogen-doped porous carbon material.
Further, the nitrogen-doped porous carbon material is applied to the field of electrocatalysis and used as a negative electrode material for preparing a zinc-air battery.
Compared with the prior art, the technical scheme provided by the invention has the following advantages:
1. the method disclosed by the invention has the advantages that the alkali lignin is used as the raw material, the source is wide, the cost is low, and the cost can be reduced to a greater extent. Meanwhile, the technical route is simple, the nitrogen-doped porous carbon material is obtained only through blending pyrolysis reaction, and the preparation process is convenient.
2. According to the invention, the lignin is stripped in a gas phase by adopting the nitrogen-containing auxiliary agent, N element can be doped in the carbon chain structure of the lignin in the pyrolysis process, and the original lignin microspheres are converted into a wrinkled and fluffy porous structure through gas phase etching. The hetero atoms provide more active sites for the carbon material to enhance the electro-catalytic activity, and the porous structure also provides more channels for electron transmission in the electrochemical reaction process.
3. The nitrogen-doped porous carbon material prepared by the method disclosed by the invention can be applied to the field of electrocatalysis, can be used as a negative electrode material for preparing a zinc-air battery, and has better performance.
Description of the drawings:
FIG. 1 is a sorption-desorption isotherm diagram of a nitrogen-doped porous carbon material obtained by vapor phase exfoliation and a carbon material obtained by direct pyrolysis of lignin in example 1.
FIG. 2 is a graph showing the pore size distribution of the nitrogen-doped porous carbon material obtained by vapor phase exfoliation and the carbon material obtained by direct pyrolysis of lignin in example 1.
Fig. 3 is an XPS spectrum of the nitrogen-doped porous carbon material prepared in embodiment 1.
Fig. 4 is an SEM photograph of the nitrogen-doped porous carbon material produced in embodiment 1.
Fig. 5 shows the peak power density of the nitrogen-doped porous carbon material assembled zinc-air battery prepared in embodiment 1.
The specific implementation mode is as follows:
in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
1g of alkali lignin and 4g of NH 4 Cl、1g ZnCl 2 Blending, ball-milling for 24h by using a planetary ball mill under the condition of 300r/min until the mixture is ground into grey powder, putting the grey powder into a corundum boat, pyrolyzing the grey powder in a tube furnace, heating up by stages, heating up to 350 ℃ at the speed of 1 ℃/min in the first stage, and preserving heat for 3 h; then the temperature is raised to 800 ℃ at the speed of 1 ℃/min, and the temperature is kept for 3 h. By reaction of NH 4 Cl and ZnCl 2 Complete decomposition (NH) 4 Cl decomposition temperature is 337.8 ℃, ZnCl 2 Boiling point 732 deg.c) to produce a complete reaction of gas and lignin.
And pouring the pyrolyzed porous carbon material into 50ml of 2mol/L hydrochloric acid, stirring for 12 hours, performing centrifugal separation on the precipitate, washing the precipitate for 3 times by using deionized water, drying the precipitate in an oven at 60 ℃, and drying the dried precipitate to obtain the nitrogen-doped porous carbon material.
FIG. 1 is a diagram showing adsorption and desorption isotherms of a carbon material obtained by directly pyrolyzing lignin and the nitrogen-doped porous carbon material obtained by gas phase stripping, and the specific surface area is calculated to show that the specific surface area of the carbon material obtained by directly pyrolyzing lignin is only 148.3m 2 G, and the specific surface area of the nitrogen-doped porous carbon material is 1011.4m 2 /g。
Fig. 2 is a calculated pore size distribution diagram of a BJH model, in contrast to the pore size structure of the nitrogen-doped porous carbon material, in which a large number of micropores appear.
As can be seen from the XPS spectrum of fig. 3, the nitrogen-doped porous carbon material is composed of C, O, N elements.
As can be seen from the SEM image of fig. 4, the nitrogen-doped porous carbon material is a porous structure with surface wrinkles, fluffiness and many pores, and the abundant pore structure and the high specific surface area thereof provide more channels for transporting intermediates in the electrochemical reaction, which is beneficial to improving the electrocatalytic activity of the material.
As can be seen from FIG. 5, when the nitrogen-doped porous carbon material was used as a negative electrode to assemble a zinc-air battery, the peak power density was 62.4mW/cm 2 Slightly larger than Pt/C-RuO 2 Peak power density of(54.1mW/cm 2 ). These results fully demonstrate that the nitrogen-doped porous carbon material can be used as a metal-air battery dual-functional cathode material with great application potential.
Example 2
1g of alkali lignin, 5g of melamine and 1g of ZnC 2 O 4 Blending, ball-milling for 24h by using a planetary ball mill under the condition of 300r/min until the mixture is ground into grey powder, putting the grey powder into a corundum boat, pyrolyzing the grey powder in a tube furnace, heating up by stages, heating up to 350 ℃ at the speed of 1 ℃/min in the first stage, and preserving heat for 3 h; then the temperature is raised to 800 ℃ at the speed of 1 ℃/min, and the temperature is kept for 3 h. And pouring the pyrolyzed porous carbon material into 80ml of 2mol/L hydrochloric acid, stirring for 12h, performing centrifugal separation on the precipitate, washing the precipitate for 3 times by using deionized water, drying the precipitate in an oven at 60 ℃, and drying to obtain the nitrogen-doped porous carbon material.
The specific surface area of the obtained nitrogen-doped porous carbon material is 923.1m 2 The nitrogen-doped porous carbon material is used as a negative electrode to assemble a zinc-air battery, and the peak power density is 59.3mW/cm 2
Example 3
1g of alkali lignin, 6g of carbon nitride and 1g of ZnCO 3 Blending, ball milling for 24h at 300r/min by using a planetary ball mill until the mixture is ground into grey powder, putting the grey powder into a corundum boat, pyrolyzing the grey powder in a tube furnace, heating the mixture in stages, heating the mixture to 350 ℃ at the speed of 1 ℃/min in the first stage, and keeping the temperature for 3 h; then the temperature is raised to 800 ℃ at the speed of 1 ℃/min, and the temperature is kept for 3 h. And pouring the pyrolyzed porous carbon material into 150ml of 2mol/L hydrochloric acid, stirring for 12h, performing centrifugal separation on the precipitate, washing the precipitate for 3 times by using deionized water, drying the precipitate in an oven at 60 ℃, and drying to obtain the nitrogen-doped porous carbon material.
The specific surface area of the obtained nitrogen-doped porous carbon material is 805.5m 2 The nitrogen-doped porous carbon material is used as a negative electrode to assemble a zinc-air battery, and the peak power density is 52.1mW/cm 2

Claims (9)

1. A method for preparing a nitrogen-doped porous carbon material by stripping lignin in a gas phase comprises the following steps:
mixing lignin and a gas phase stripping auxiliary agent, putting the mixture into a ball milling tank, carrying out ball milling for 24 hours at the rotating speed of 300r/min, transferring the mixture into a tubular furnace, and heating and carbonizing the mixture by stages; and after carbonization is finished, adding hydrochloric acid into the obtained porous carbon material, stirring and washing, washing with deionized water, performing centrifugal precipitation, and drying to obtain the nitrogen-doped porous carbon material.
2. The method for preparing the nitrogen-doped porous carbon material by gas-phase stripping of lignin according to claim 1, wherein: the lignin is alkali lignin washed by deionized water.
3. The method for preparing the nitrogen-doped porous carbon material by gas-phase stripping of lignin according to claim 1, wherein: the gas phase stripping auxiliary agent comprises Zn 2+ Salts and nitrogen-containing compounds.
4. The method for preparing the nitrogen-doped porous carbon material by gas-phase stripping of lignin according to claim 3, wherein: the nitrogen-containing compound is NH 4 Cl, melamine or carbon nitride; said Zn 2+ The salt being ZnCl 2 、ZnC 2 O 4 Or ZnCO 3
5. The method for preparing the nitrogen-doped porous carbon material by gas-phase stripping of lignin according to claim 3, wherein: lignin, nitrogenous compounds, Zn used 2+ The mass ratio of the salt is 1:4-6: 1.
6. The method for preparing the nitrogen-doped porous carbon material by gas-phase stripping of lignin according to claim 1, wherein: the rotation speed of the ball milling is 300r/min, and the reaction time of the ball milling is 24 h.
7. The method for preparing the nitrogen-doped porous carbon material by gas-phase stripping of lignin according to claim 1, wherein: during carbonization, inert gas is used as nitrogen or argon, the temperature is raised to 350 ℃ at the speed of 1 ℃/min in stages, and the temperature is kept for 3 h; then the temperature is raised to 800 ℃ at the speed of 1 ℃/min, and the temperature is kept for 3 h.
8. The method for preparing the nitrogen-doped porous carbon material by gas-phase stripping of lignin according to claim 1, wherein: the hydrochloric acid concentration for washing the porous carbon material is 2mol/L, the stirring time is 12h, and then the porous carbon material is washed by deionized water and then centrifugally dried to obtain the nitrogen-doped porous carbon material.
9. Use of a nitrogen doped porous material prepared by the method according to any one of claims 1 to 8, characterized in that: the nitrogen-doped porous carbon material is applied to the field of electrocatalysis and used as a negative electrode material for preparing a zinc-air battery.
CN202210554421.3A 2022-05-20 2022-05-20 Method for preparing nitrogen-doped porous carbon material by gas-phase stripping of lignin and application Pending CN114804069A (en)

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CN106744789A (en) * 2016-11-14 2017-05-31 天津工业大学 A kind of utilization lignin prepares porous charcoal and the application in ultracapacitor
CN109701493A (en) * 2019-02-28 2019-05-03 西北农林科技大学 A kind of preparation method of N doping charcoal
CN110891682A (en) * 2017-07-13 2020-03-17 日清纺控股株式会社 Carbon catalyst, battery electrode and battery
CN111362249A (en) * 2020-02-24 2020-07-03 中国科学院深圳先进技术研究院 Two-dimensional porous nitrogen-doped carbon, preparation method thereof and application thereof in lithium ion battery
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Application publication date: 20220729