Air cathode, preparation method and sewage treatment system

An air cathode and catalyst layer technology, applied in the fields of materials, energy, and environment, can solve the problems of difficult to achieve practical application, expensive catalysts, serious pollution, etc.

Active Publication Date: 2017-11-24
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the main method for preparing hydrogen peroxide is the anthraquinone oxidation method, but this method has many disadvantages such as high cost and serious pollution.
Based on electrochemical catalysis, the method of preparing hydrogen peroxide by electrolysis of water is also difficult to realize practical application due to the relatively expensive catalyst and the high potential of hydrogen peroxide production.
[0004] Therefore, the catalysts, electrodes and sewage treatment systems currently used to prepare hydrogen peroxide still need to be improved.

Method used

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  • Air cathode, preparation method and sewage treatment system
  • Air cathode, preparation method and sewage treatment system
  • Air cathode, preparation method and sewage treatment system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Embodiment 1 Preparation of oxygen-doped graphene catalyst

[0070] Add 100mg of graphene powder into 25mL of concentrated sulfuric acid, react for four hours, gradually add 25mL of 10% dilute sulfuric acid to the reaction system within one hour, then gradually add 75mL of deionized water within two hours, and finally add 2mL of hydrogen peroxide Terminate the reaction and complete the oxidation process. During the whole process of the reaction, the whole system was placed in an ice bath and kept stirring. Then dry at 60°C for 12 hours to obtain oxygen-doped graphene. Utilize XPS to test the composition of the obtained oxygen-doped graphene, scanning spectrogram and O1s peak division result are as follows Figure 10 shown.

Embodiment 2

[0071] Example 2 Preparation of air cathode

[0072] First the diffusion layer is prepared. The mass ratio of carbon black to PTFE on the diffusion layer is controlled at 3:10, that is, the loading of carbon black is about 13mg / cm 2 , while the load of PTFE is about 44mg / cm 2 , according to 11.34cm 2 Weigh carbon black and PTFE, add appropriate amount of ethanol to increase the viscosity of the mixture. Ultrasonic mixing in a water bath for about 1 min forms a viscous substance. The viscous substance is rolled on the flat plate for 2-3 times, and then directly pressed on the stainless steel mesh or titanium mesh, and pressed under the condition of 4.5MPa for 10 minutes. Put the pressed diffusion layer into a muffle furnace, and heat-treat at 340°C for 20 minutes to make it solidify and form.

[0073] Next, a catalyst layer is prepared. Weigh 300 mg of the catalyst formed by carbon black, add 50 μL of 60% PTFE and 450 μL of deionized water, and add 300 μL of ethanol, and ...

Embodiment 3

[0075] Example 3 Preparation of Air Cathode

[0076] Referring to Example 2, the difference is that graphene is used as a catalyst, and the loading capacity of the catalyst is 17.6 mg / cm 2 . Among them, the XPS spectrum of graphene and the O1s peak splitting results are as follows Figure 11 shown.

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Abstract

The invention provides an air cathode, a preparation method, a sewage treatment system, and the application of a carbon-based material in preparation of a catalyst. The air cathode comprises a diffusion layer, a catalyst layer and a collector layer, wherein the catalyst layer contains the catalyst; the catalyst layer is arranged on one side of the diffusion layer; the collector layer and the catalyst layer are arranged on the same side of the diffusion layer. The air cathode is simple in structure and can be prepared without complicated operation; the air cathode can realize preparation of hydrogen peroxide through cathode reduction reaction under a relatively low potential.

Description

technical field [0001] The invention relates to the fields of environment, materials and energy, and specifically, the invention relates to an air cathode, a preparation method, a sewage treatment system, and the use of carbon-based materials in the preparation of catalysts. Background technique [0002] Hydrogen peroxide is a clean and strong oxidizing agent, which has been widely used in textile, chemical and other industries. Due to its strong oxidation ability and green and clean oxidation products, hydrogen peroxide is also used in the advanced treatment of sewage, especially in the treatment of refractory pollutants and the realization of decolorization and disinfection of sewage. It has played an important role. [0003] However, the main method for preparing hydrogen peroxide is anthraquinone oxidation, but this method has many disadvantages such as high cost and serious pollution. Based on electrochemical catalysis, the method of preparing hydrogen peroxide by elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F3/34H01M4/90H01M8/16
CPCH01M4/90H01M4/9083H01M8/16C02F1/46104C02F1/46109C02F3/34C02F2001/46142Y02E60/50Y02P70/50
Inventor 张潇源董恒黄霞刘小婉梁鹏徐婷王秋莹
Owner TSINGHUA UNIV
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