Preparation method for silver-loaded N-doped graphene, and application of silver-loaded N-doped graphene in metal-air battery catalyst

A technology of nitrogen-doped graphene and sulfonated graphene, which is applied in the direction of physical/chemical process catalysts, battery electrodes, chemical instruments and methods, etc. It can solve the problems of difficult to meet environmental protection requirements, low nitrogen doping amount, and harsh reaction conditions and other issues to achieve the effect of aerobic reduction catalytic performance

Active Publication Date: 2015-12-16
宁波烯铝新能源有限公司
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AI Technical Summary

Problems solved by technology

These methods have the following disadvantages at present: chemical vapor deposition method, ammonia source pyrolysis method, nitrogen plasma discharge method, arc discharge method, etc. have low nitrogen doping amount and many preparation procedures; liquid phase nitrogen doping method although nitrogen doping amount can be up to 16.4%, but involves the dangerous raw material Li 3 N, the reaction conditions are relatively harsh
However, due to the use of toxic and harmful hydrazine hydrate as a reducing agent, it is difficult to meet environmental protection requirements. On the other hand, the high temperature in the vacuum melting process brings great damage to the graphene structure, which affects the graphene in the matrix to a certain extent. Dispersion, which affects product performance
[0007] At present, there is no related research that can realize the reduction of silver on graphene oxide, graphene oxide reduction and nitrogen doping at the same time in the next step at a relatively low temperature.

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  • Preparation method for silver-loaded N-doped graphene, and application of silver-loaded N-doped graphene in metal-air battery catalyst
  • Preparation method for silver-loaded N-doped graphene, and application of silver-loaded N-doped graphene in metal-air battery catalyst
  • Preparation method for silver-loaded N-doped graphene, and application of silver-loaded N-doped graphene in metal-air battery catalyst

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preparation example Construction

[0038] The embodiment of the present invention discloses a method for preparing silver-loaded nitrogen-doped graphene, comprising:

[0039] Silver nitrate, ammonia water and functionalized graphene solution are mixed and placed in a high-temperature reactor, and reacted at 100-200°C for 1-12 hours to obtain silver-loaded nitrogen-doped graphene;

[0040] The functionalized graphene is selected from one or more of graphene oxide, sulfonated graphene, aminated graphene, polyacrylic acid modified graphene oxide and polyacrylamide modified graphene oxide;

[0041]The concentration of the functionalized graphene solution is 0.5-10 mg / mL.

[0042] This application adopts a one-step method to synthesize silver-loaded nitrogen-doped graphene. In addition, the nitrogen-doping reaction temperature is low, and the nitrogen content is high, and the experimental process is simple and easy to implement.

[0043] According to the present invention, the raw materials are first mixed, and the...

Embodiment 1

[0065] Dissolve 50mg of silver nitrate with an appropriate amount of deionized water, add excess ammonia water to adjust the pH of the solution to 12-13, it can be observed that the transparent solution first forms a brown precipitate, and then the precipitate becomes a transparent solution again, and then add 10ml with a concentration of 1mg / ml homogeneous graphene oxide solution; then the obtained mixture was ultrasonically cleaned for 1h with an ultrasonic cleaner, and then the aqueous solution of the mixture was added to a high-temperature reactor to react for 12h at a temperature of 200°C, and the obtained product was washed with deionized water Several times until the pH of the clear liquid is neutral; finally, the washed product is lyophilized to obtain the final product, namely silver-loaded nitrogen-doped graphene.

[0066] figure 1 For the scanning electron micrograph of the nitrogen-doped graphene loaded with silver prepared in this embodiment, it can be seen that t...

Embodiment 2

[0072] Dissolve 100mg of silver nitrate with an appropriate amount of deionized water, add excess ammonia water to adjust the pH of the solution to 12-13, it can be observed that the transparent solution first forms a brown precipitate, and then the precipitate becomes a transparent solution, and then add 20ml of the concentration of 5mg / ml homogeneous graphene oxide solution; then the mixture is ultrasonically cleaned for 1h, then the aqueous solution of the mixture is added to a high-temperature reactor and reacted for 1h at a temperature of 160°C, and the obtained product is washed several times with deionized water until the pH of the clear liquid is neutral; finally, the washed product is lyophilized to obtain the final product, namely silver-loaded nitrogen-doped graphene.

[0073] Figure 7 The battery performance tested for the catalyst as a battery device, in Fig. The curve is the battery performance curve of the catalyst of this example. It can be seen that the cat...

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Abstract

The invention provides a preparation method for silver-loaded N-doped graphene. The preparation method comprises the following step: mixing functionalized graphene, silver nitrate and ammonium hydroxide and reacting to obtain the silver-loaded N-doped graphene. The preparation process is easy and liable to implement, energy is saved, environment friendliness is realized, and the silver-loaded N-doped graphene has a relatively good oxygen reduction catalytic performance.

Description

technical field [0001] The invention relates to the field of metal-air batteries, in particular to the application of silver-loaded nitrogen-doped graphene in metal-air batteries. Background technique [0002] A metal-air battery is an electrochemical unit that converts chemical energy directly into electrical energy through the reaction of metal and oxygen at room temperature. It is efficient, convenient, and environmentally friendly. Objectively speaking, although metal-air batteries have many advantages, they still need to meet three key conditions for their commercialization: performance, cost and stability. For now, the development of metal-air batteries still faces an important technical problem: low electrochemical reaction rate, poor life and stability of catalytic materials, especially the cathode oxygen reduction reaction, and expensive catalysts. Therefore, the development of catalysts with high oxygen reduction activity, low cost, environmental friendliness, ear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24H01M4/90
CPCY02E60/50
Inventor 李世华刘兆平苗鹤薛业建
Owner 宁波烯铝新能源有限公司
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