Electrolytic ozone generator and preparation technique for cathode catalysis layer thereof

A technology of ozone generator and cathode catalysis, which is applied in the field of electrochemistry, can solve the problems of low current efficiency, short electrode life, high ozone cost, etc., and achieve the effect of improving current efficiency, stable performance, and prolonged continuous service life

Inactive Publication Date: 2008-08-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The cost of using Pt as an anode to prepare ozone is too high, and the current efficiency is not high;
[0006] 2. Use lead dioxide as an anode to prepare ozone, the electrode life is short, and the current efficiency is not high (10% to 15%);
[0007] 3. The preparation process of the existing anode catalytic layer is unstable;
[0008] 4. Compared with the existing technology of producing ozone by electrolytic method, the power consumption of ozone produced by the silent discharge method is large
[0010] The use of boron-doped diamond electrodes (boron-carbon electrodes) to generate ozone has been reported in the late 1990s. Although boron-carbon electrodes have high chemical stability, due to the preparation technology of electrodes and electrolytic chambers Defects, the current efficiency of ozone generation is still low

Method used

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  • Electrolytic ozone generator and preparation technique for cathode catalysis layer thereof
  • Electrolytic ozone generator and preparation technique for cathode catalysis layer thereof
  • Electrolytic ozone generator and preparation technique for cathode catalysis layer thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The thickness (H) of disc boron carbon anode piece (7) is 0.4mm, and diameter (D) is 35mm; The aperture (d) of axial small through hole (20) is 0.2mm, adjacent small through hole (20 ) The hole spacing (h) is 3.0mm.

[0036] The preparation technology of cathode catalyst layer (9) is: the carbon-supported platinum and Nafion emulsion with a platinum loading of 10% are m Pt :m Nafion= 1:1.8 mixing, add appropriate amount of isopropanol and stir evenly, stir in a 65°C water bath until it becomes a paste, roll it into a 0.15±0.02 mm thick film at 25°C, dry it at 60°C and cut it into the desired shape The size is the cathode catalytic layer.

[0037] The processed disc-shaped boron carbon anode sheet (7) and the prepared cathode catalytic layer (9) are installed in such as figure 1 or figure 2 In the shown electrolysis chamber, pure water is passed through the cathode and anode of the electrolysis chamber respectively, and the water flow rate is 4L / min.

Embodiment 2

[0039] The thickness (H) of disc boron carbon anode piece (7) is 0.8mm, and diameter (D) is 55mm; The aperture (d) of axial small through hole (20) is 0.5mm, adjacent small through hole (20 ) hole spacing (h) is 3.5mm.

[0040] The preparation technology of cathode catalyst layer (9) is: the carbon-supported platinum and Nafion emulsion with a platinum loading of 10% are m Pt :m Nafion = 1:1.5 mix, add appropriate amount of isopropanol and stir evenly, stir in a water bath at 75°C until it becomes a paste, roll at 35°C to form a film with a thickness of 0.15±0.02mm, dry at 70°C and cut into desired The size is the cathode catalytic layer.

[0041] The processed disc-shaped boron carbon anode sheet (7) and the prepared cathode catalytic layer (9) are installed in such as figure 1 or figure 2 In the shown electrolysis chamber, pure water is passed through the cathode and anode of the electrolysis chamber respectively, and the water flow rate is 10L / min.

Embodiment 3

[0043] The thickness (H) of disc boron carbon anode piece (7) is 1.2mm, and diameter (D) is 75mm; The aperture (d) of axial small through hole (20) is 0.8mm, adjacent small through hole (20 ) hole spacing (h) is 4.0mm.

[0044] The preparation technology of cathode catalyst layer (9) is: the carbon-supported platinum and Nafion emulsion with a platinum loading of 20% are m Pt :m Nafion = 1:1.2 mixing, add appropriate amount of isopropanol and stir evenly, stir in a water bath at 70°C until it becomes a paste, roll at 30°C to form a film with a thickness of 0.15±0.02mm, dry at 80°C and cut into desired The size is the cathode catalytic layer.

[0045] The processed disc-shaped boron carbon anode sheet (7) and the prepared cathode catalytic layer (9) are installed in such as figure 1 or figure 2 In the shown electrolysis chamber, pure water is passed through the cathode and anode of the electrolysis chamber respectively, and the water flow rate is 18L / min.

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Abstract

The invention relates to an electrolytic type ozone generator and a process for preparing a cathode catalyst layer of the electrolytic type ozone generator. The electrolytic type ozone generator comprises a round Nafion film, a round anode component and a round cathode component which are arranged on two axial sides of the Nafion film. The electrolytic type ozone generator adopts a diamond electrode which is doped with porous boron as an anode, the cathode catalyst layer adopts a process for preparing platinum-on-carbon and an electrolysis chamber for preparing ozone is optimally designed, not only the performance is greatly increased, but also the current efficiency of a borocarbon electrode to produce the ozone is greatly increased, the current efficiency can reach 30% under room temperature to the maximum, and the continuous service life of the electrodes can be greatly prolonged compared with lead dioxide electrodes which are used in a large number at present.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and relates to a device for preparing ozone, in particular to an electrolytic ozone generator and a preparation process for a cathode catalytic layer thereof. Background technique [0002] Ozone is an environmentally friendly oxidizing agent. It has the strongest oxidizing property among commonly used oxidizing agents, and the product after the reaction is oxygen that is beneficial to the human body. Due to the above advantages, ozone products have been widely used in drinking water treatment, sewage treatment, chemical oxidation, pulp bleaching and medical and health fields. [0003] The traditional ozone generation technology is the corona method ozone generation technology, which is a method of generating ozone by passing dry oxygen-containing gas through the corona discharge area. There are many patents for this preparation method, such as CN 96209877.9, CN 01817517.1, CN 02237175.3 Wait. To...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/13
Inventor 王景平王杨勇李仲谨牛育华李翔郭凌华刘正安惠烨
Owner SHAANXI UNIV OF SCI & TECH
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