Nitrogen-doped carbon aerogel catalyst used for metal-air battery, and preparation method

A technology of carbon aerogel and air battery, which is applied in battery electrodes, circuits, electrical components, etc., can solve problems such as difficult polymer nanosheets, and achieve the effects of simple preparation method, good durability, and high stability

Inactive Publication Date: 2016-11-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited by the limited volume of hydrothermal equipment and the special requirements of the hydrothermal method for high pressure and high temperature equipment, it is difficult to achieve the polymer nanosheets required for macro-preparation by the hydrothermal method.

Method used

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  • Nitrogen-doped carbon aerogel catalyst used for metal-air battery, and preparation method
  • Nitrogen-doped carbon aerogel catalyst used for metal-air battery, and preparation method
  • Nitrogen-doped carbon aerogel catalyst used for metal-air battery, and preparation method

Examples

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Embodiment 1

[0052] A method for preparing a nitrogen-doped carbon airgel catalyst (PPyNSs-800) for a metal-air battery, comprising the following steps:

[0053] (1) Add 4.8g of pyrrole, 1.0g of polyvinylpyrrolidone (K30) and 20g of sodium chloride into ethanol, heat and stir until the ethanol is completely volatilized, and a light yellow solid is obtained;

[0054] (2) Slowly add trivalent iron salt solution dropwise to the light yellow solid in step (1) with stirring and heating, until the light yellow solid turns into a dark green solid completely, stop the dropwise addition. Quickly add ultrapure water to the dark green solid, wash and filter repeatedly, collect the dark green insoluble matter, that is, polypyrrole nanosheets, and put them in an oven to dry. The structural characteristics are as follows: figure 1 As shown, the elemental characterization is as figure 2 As shown, it can be seen from the figure that in addition to a large number of C and N elements in the polypyrrole na...

Embodiment 2

[0070] A method for preparing a nitrogen-doped carbon airgel catalyst (PPyNSs-700) for a metal-air battery, comprising the following steps:

[0071] (1) Add 4.8g of pyrrole, 1.0g of polyvinylpyrrolidone (K30) and 20g of sodium chloride into ethanol, heat and stir until the ethanol is completely volatilized, and a light yellow solid is obtained;

[0072] (2) Slowly add trivalent iron salt solution dropwise to the light yellow solid in step (1) with stirring and heating, until the light yellow solid turns into dark green solid completely, stop the reaction. Quickly add ultrapure water to the dark green solid, wash and filter repeatedly, collect dark green insoluble matter, that is, polypyrrole nanosheets, and put them in an oven to dry. The structural characterization shows that in addition to a large amount of C, N elements exist in polypyrrole nanosheets , there are also a large number of Fe, Cl elements, indicating that Fe, Cl elements are uniformly doped on the polypyrrole n...

Embodiment 3

[0076] A method for preparing a nitrogen-doped carbon airgel catalyst (PPyNSs-900) for a metal-air battery, comprising the following steps:

[0077] (1) Add 4.6g of pyrrole, 1.0g of polyvinylpyrrolidone (K30) and 20g of sodium chloride into ethanol, heat and stir until the ethanol is completely volatilized, and a light yellow solid is obtained;

[0078] (2) Slowly add trivalent iron salt solution dropwise to the light yellow solid in step (1) with stirring and heating, until the light yellow solid turns into dark green solid completely, stop the reaction. Quickly add ultrapure water to the dark green solid, wash and filter repeatedly, collect the dark green insoluble matter, that is, polypyrrole, put it in an oven for drying, and obtain a dark green polypyrrole solid.

[0079] (3) The dark green polypyrrole solid in step (2) was placed in a quartz tube furnace, nitrogen gas was introduced, the temperature was raised to 900° C., the temperature was kept for 2 hours, and the tem...

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Abstract

The invention belongs to the technical field of a catalyst, and discloses a nitrogen-doped carbon aerogel catalyst used for a metal-air battery, and a preparation method. The preparation method comprises the following steps of (1) adding pyrrole, polyvinylpyrrolidone and sodium chloride into ethyl alcohol, heating and stirring until the ethyl alcohol is fully volatilized to obtain an intermediate product A; (2) adding a ferric salt solution to the intermediate product A obtained in the step (1), and heating and stirring to obtain a polypyrrole nanosheet; and (3) heating the polypyrrole nanosheet obtained in the step (2) to obtain the nitrogen-doped carbon aerogel catalyst. The preparation method is simple without involving the conventional complicated and time-consuming template pore-forming step; instead, a precursor is carbonized directly to obtain the required porous carbon material; the catalytic performance of the material is maintained to the maximum degree; the obtained nitrogen-doped carbon aerogel catalyst is large in specific surface area, high in catalytic property and high in stability; and in addition, the nitrogen-doped carbon aerogel catalyst, used as the negative electrode material of a zinc air battery, has excellent oxygen reduction catalytic activity, so that the nitrogen-doped carbon aerogel catalyst can be applied to the fields of fuel cells.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a nitrogen-doped carbon airgel catalyst for a metal-air battery and a preparation method and application thereof. Background technique [0002] Metal-air batteries have a series of advantages such as abundant raw material selection, safety and environmental protection, high energy density, and high conversion efficiency. They are called "new green energy for the 21st century" and have great application prospects in the fields of electric vehicles and mobile electronic devices. . The anode of the metal-air battery is an inexpensive active metal, such as magnesium, aluminum and zinc, etc., and the metal M is oxidized to the corresponding metal ion Mn during discharge. n+ ; The electrolyte is an alkaline or neutral medium, such as KOH or NaCl aqueous solution; the cathode active material is O in the air 2 , when discharging O 2 is reduced to OH - . due to O 2 It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/8825H01M4/90Y02E60/50
Inventor 黎立桂牛文翰陈少伟
Owner SOUTH CHINA UNIV OF TECH
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