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A kind of high surface area solid polymer membrane electrode and preparation method thereof

A solid polymer, membrane electrode technology, applied in the field of electrolysis of water, can solve the problems of high electrode cost and low reaction surface area, and achieve the effect of reducing preparation cost, reducing load and improving stability

Active Publication Date: 2019-12-24
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects of high cost and low reaction surface area of ​​solid polymer membrane electrodes in the prior art, and then provide a new method for preparing solid polymer membrane electrodes

Method used

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  • A kind of high surface area solid polymer membrane electrode and preparation method thereof
  • A kind of high surface area solid polymer membrane electrode and preparation method thereof
  • A kind of high surface area solid polymer membrane electrode and preparation method thereof

Examples

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Effect test

Embodiment 1

[0049] The present embodiment provides a kind of solid polymer membrane electrode, and its structure comprises, the material is the proton exchange membrane main body 1 of Nafion film and is arranged on some proton exchange columns 2 of this proton exchange membrane main body 1 side, and these several proton exchange columns The material is also Nafion membrane, and the proton exchange column is equipped with IrO 2 -RuO 2 Catalyst particles.

[0050] This embodiment also provides a method for preparing a high surface area polymer membrane electrode, such as figure 1 As shown, it specifically includes the following steps,

[0051] Take the Nafion membrane and coat one surface with RuO 2 The isopropanol dispersion liquid, complete the first catalyst coating, the loading amount is 0.1mg / cm 2 , the duty cycle is about 10%, and then baked at 90°C for 10min.

[0052] Reactive ion etching is used to etch the surface of the membrane coated with the catalyst, using oxygen as the e...

Embodiment 2

[0055] This embodiment provides a method for preparing a high surface area polymer membrane electrode, which specifically includes:

[0056] Take Nafion membrane and coat IrO on one surface 2 The isopropanol dispersion liquid, complete the catalyst coating for the first time, the loading amount is 0.5mg / cm 2 , the duty cycle is about 50% at this time, and then bake at 90°C for 10min.

[0057] The catalyst-coated film surface was etched by a reactive ion etching process, using argon as an etching gas for 4 minutes, and the etching depth was about 200 nm at this time.

[0058] The second catalyst coating is carried out on the surface of the etched membrane, still using IrO 2 isopropanol dispersion, the loading amount is 1mg / cm 2 , and then baked at 90°C for 30min.

Embodiment 3

[0060] This embodiment provides a method for preparing a high surface area polymer membrane electrode, which specifically includes:

[0061] Take the Nafion membrane, and coat the isopropanol dispersion of Ir metal particles on one surface to complete the first catalyst coating, with a loading capacity of 0.2 mg / cm 2 , at this time the duty cycle is about 20%, and then bake at 90°C for 10min.

[0062] Reactive ion etching was used to etch the catalyst-coated membrane surface, using oxygen as the etching gas, and etching for 10 minutes. At this time, the etching depth was 500 nm, and several proton exchange columns with a length of 500 nm were formed.

[0063] Carry out the second catalyst coating on the surface of the membrane after etching, and still use the isopropanol dispersion liquid of Ir metal particles to coat, so that the catalyst particles are attached to the proton exchange column, and the loading capacity of Ir metal particles is 3mg / cm 2 , and then baked at 90°C ...

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Abstract

The invention belongs to the technical field of electrolyzed water, and in particular relates to a preparation method of an electrode film. The preparation method of the solid polymer membrane electrode provided by the present invention first coats the catalyst on the surface of the proton exchange membrane to cover the surface of the membrane incompletely; The surface is etched to form pores or finger-like structures, and then the catalyst is coated again, so that the catalyst particles are attached to the membrane surface in the pores or the membrane surface of the finger-like structure. The preparation method provided by the present invention can significantly increase the electrochemically active specific surface area of ​​the membrane electrode anode catalyst, open up the multi-phase connection between the catalyst particle and the water channel, electron channel, proton channel, gas channel, etc. of the electrochemical reaction, and finally achieve the improvement of catalyst The purpose of improving the utilization rate, reducing the amount of catalyst loading, and greatly reducing the cost of membrane electrode preparation.

Description

technical field [0001] The invention belongs to the technical field of electrolyzed water, and in particular relates to a preparation method of an electrode film. Background technique [0002] Energy conversion technology plays an important role in the consumption and storage of renewable energy, and electrolysis of water to produce hydrogen and oxygen is a relatively mature energy conversion technology. In recent years, solid polymer water electrolysis (SPE) technology has been gradually accepted at home and abroad and achieved initial commercialization due to its simple structure, small size, high efficiency, fast start-stop and high safety. change. Solid polymer water electrolysis uses a solid polymer electrolyte to replace the diaphragm and electrolyte in traditional alkaline electrolysis water, and forms a membrane electrode by embedding catalysts on both sides of the solid polymer electrolyte as a whole, which has both catalytic reaction and ion transport. function. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/10C25B9/10C25B11/08C25B9/23
CPCC25B1/04C25B9/73C25B9/23C25B11/081C25B11/097C25B11/051Y02E60/36
Inventor 田博元刘锋刘少名梁丹曦徐桂芝邓占锋
Owner STATE GRID CORP OF CHINA
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