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Gas diffusion cathode and preparation method and application thereof

A gas diffusion cathode and waterproof and breathable membrane technology, applied in the field of electrochemistry, can solve the problems of increasing gas diffusion flux, increasing porosity, increasing the risk of liquid leakage, etc., to reduce production costs and operating costs, reduce The risk of liquid leakage and the effect of improving waterproof and breathable performance

Active Publication Date: 2019-10-15
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increased porosity increases gas diffusion flux, but also increases risk of liquid leakage

Method used

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  • Gas diffusion cathode and preparation method and application thereof
  • Gas diffusion cathode and preparation method and application thereof
  • Gas diffusion cathode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] This embodiment provides a gas-diffusion cathode constructed with a waterproof gas-permeable membrane and a preparation method thereof, such as figure 1 As shown, its structure includes a catalyst layer 5, a collector layer 1, a carbon layer 2, an adhesive layer 3 and a waterproof and breathable film layer 4, and the adhesive layer 3 and the waterproof and breathable film 4 are combined to form a diffusion layer.

[0108] The preparation steps are as follows:

[0109] (1) The collector layer is a metal mesh with good conductivity and durability, which can be titanium mesh, nickel mesh, stainless steel mesh, etc. The stainless steel mesh is 100-300 mesh.

[0110] (2) Apply the carbon layer to the waterproof side of the metal mesh. The specific method is: powder activated carbon (purchased from Sinopharm Chemical Reagent Co., Ltd., item number 10006629) and carbon black (Vulcan XC-72) with a mass ratio of 3:1 Added to the isopropanol solvent, the total load of the two c...

Embodiment 2

[0119] This embodiment provides an independent gas-diffusion cathode structure, so that the gas-diffusion cathode can be used as an independent component and conveniently applied to electrochemical testing, sensors, microbial batteries, electro-Fenton and other process technologies. Its structure is as figure 2 shown.

[0120] The modularized gas diffusion cathode assembly includes an inlet pipe 8 , an air outlet pipe 9 , an air chamber 7 , and a gas diffusion cathode 6 (ie, an air cathode), wherein the gas diffusion cathode 6 is made by Example 1.

[0121] (1) The air chamber 7 can be designed with a cavity such as a cube or a cylinder. One side of the cavity is an open space, and the cathode sheet is assembled on the open side of the cavity so that the diffusion layer faces the side of the gas chamber to form a closed space, that is, the gas chamber.

[0122] (2) The air chamber 7 is provided with an air inlet pipe 8 and an air outlet pipe 9 , the air inlet pipe 8 extends...

Embodiment 3

[0126] Independent gas diffusion cathode assemblies can be combined with different anodes for different applications. Its applied battery structure is as Figure 5 As shown, the battery includes a cell body 25, and the cell body 25 is provided with an anode 24 and a gas diffusion cathode assembly. The anode 24 and the gas diffusion cathode assembly are connected through an external circuit, and a resistor 27 can be set on the external circuit to form a primary battery. Chemical energy is converted into electrical energy.

[0127] In one embodiment, the anode 24 is selected to form a microbial fuel cell by selecting an electrogenic microbial electrode, by selecting a photocatalytic electrode to form a photocatalytic fuel cell, and by selecting a platinum grid electrode to form an electrolytic cell.

[0128] In one embodiment, the air cathode selects the hydrogen peroxide-generating oxygen reduction catalyst, and the cell device will be used to generate hydrogen peroxide.

[0...

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Abstract

The invention provides a gas diffusion cathode and a preparation method and an application thereof. The gas diffusion cathode includes a current collecting layer. A carbon layer, an adhesive layer anda waterproof and breathable film layer are arranged in turn on one side of the current collecting layer, and a catalytic layer is arranged on the other side of the current collecting layer. The waterproof and breathable performances of the gas diffusion cathode are improved, the leakage risk is reduced, and the production cost and the operation cost are reduced.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a gas diffusion oxygen reduction cathode and a preparation method and application thereof. Background technique [0002] Oxygen reduction reaction is a basic cathode reaction in energy, environment, and chemical industry. The gas diffusion cathode based on this reaction is the most commonly used cathode form, which has the advantages of simple operation, low cost, environmental friendliness, and high reliability. At present, gas-diffusion cathodes are widely used in microbial fuel cells, hydrogen peroxide production, electro-Fenton reaction, and fuel cells in the energy field. The key to the gas diffusion cathode is to build a waterproof layer on the conductive substrate that is hydrophobic and leak-proof while having certain gas diffusion pores, also called the diffusion layer. Increasing porosity increases gas diffusion flux, but also increases the risk of liquid leakage. Con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/04082H01M8/04089H01M8/0438H01M8/16G01N15/08
CPCH01M4/8657H01M4/8605H01M4/8807H01M8/04201H01M8/04089H01M8/0438H01M8/16G01N15/0826Y02E60/50Y02P70/50
Inventor 刘鸿殷逢俊刘元宋诚黄秋云王厦
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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