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Electrode unit and electrode prepared therefrom

An electrode unit, electrode technology, applied in the direction of electrodes, electrical components, electrolysis components, etc., can solve the problems of easy recrystallization, decreased ozone current efficiency, corrosion, etc. effect of life

Active Publication Date: 2018-10-02
GUANGZHOU DEPOSON ELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of electrochemically generating ozone, the working current density of the anode is required to be high (1-3A / cm 2 ), the corrosion on the surface of the lead dioxide electrode is still relatively serious, resulting in the rapid decline in the current efficiency of ozone
Lead dioxide has many defects, and it is easy to recrystallize under high voltage and acidic conditions, resulting in unstable catalytic efficiency of the anode catalytic layer, easy to fall off, large fluctuations in ozone production, and short working life of the membrane electrode.
Not only that, in the process of generating ozone, lead dioxide itself continuously precipitates highly toxic lead. At the same time, due to the presence of calcium ions in the water, which will cause deposition on the electrode itself, this electrochemical device can only use pure water as electrolysis. materials instead of the more economical and widely used tap water

Method used

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  • Electrode unit and electrode prepared therefrom
  • Electrode unit and electrode prepared therefrom
  • Electrode unit and electrode prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The preparation of embodiment 1 conductive diamond particle

[0048] Under the condition of high temperature and high pressure (above 500°C, exceeding 10GPa), the catalyst / graphite / boron source is taken through the oil pressure mechanism to obtain conductive diamond particles, and then broken up by physical means to obtain small conductive diamond particles; or directly use high temperature and high pressure (above 500°C, exceeding 10GPa) method to prepare conductive small diamond particles, and the wire diameter of the obtained diamond particles is 4nm-1mm.

Embodiment 2

[0049] The preparation of embodiment 2 conductive diamond particles

[0050] Use the hot wire chemical vapor deposition method to deposit CVD conductive diamond coating on the conventional high temperature and high pressure diamond particles, choose the common type IIb diamond particles that are not conductive themselves, the wire diameter is 4nm ~ 1mm, first use hydrogen peroxide, nitric acid, pure water respectively , alcohol, etc., and then placed in a hot-wire chemical vapor deposition equipment for growth. The growth conditions are as follows: abutment temperature 500-800°C, hot-wire temperature 180-2400°C, air pressure 1-5kPa, hydrogen gas 100- 1000SCCM, methane 1-20SCCM, borane 1-20SCCM, grow for more than 10 minutes, form a conductive diamond coating layer on the above-mentioned diamond particles, the thickness of the coating layer is 4nm-10μm, that is, form a composite structure of surface conductive diamond particles, Such as figure 2 shown.

Embodiment 3

[0051] Embodiment 3 Conductive diamond particle is the preparation of the electrode of anode

[0052] 1. Pretreatment of PEM membrane (DuPont Nafion117 membrane): (1) HNO with a volume ratio of 1:1 3 -H 2 O or H with a mass concentration of 5% to 10% 2 o 2 Boil in medium for 30 minutes to remove impurities on the membrane and organic matter on the surface of the membrane; (2) in 0.5mol of H 2 SO 4 Boil in medium for 30 minutes to remove metal impurities; (3) then place the membrane in boiling deionized water for 1 hour to remove excess acid and introduce renewable amounts of water into the membrane; (4) finally place the pretreated PEM membrane Store in deionized water until use.

[0053] 2. Make the conductive diamond particle anode on one side of the pretreatment PEM film, and use the conductive diamond particle, deionized water, ethanol, glycerin and Nafion solution made in Example 1 by ultrasonic oscillation, according to the weight ratio of 0.5:1:1:0.5 : 0.4 uniform...

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Abstract

The invention discloses an electrode unit and an electrode prepared therefrom. The electrode unit comprises an electrode catalysis layer, which is composed of conductive diamond particles. The electrode prepared from the electrode unit comprises a positive pole and a negative pole. The positive pole and / or the negative pole are composed of the electrode unit. The electrode also comprises a PEM membrane. The positive pole and the negative pole are arranged on two sides of the PEM membrane. Conductive diamond particles are used to prepare the electrode catalysis layer, no basic material such asmetal, semiconductor, or ceramic is needed, the problem of difference of thermal expansion coefficients is solved, mechanical processing is not needed, and thus the manufacturing cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of electrode units, and more specifically, relates to an electrode unit and electrodes composed thereof. Background technique [0002] In recent years, conductive diamond has been used as an anode material to generate ozone. Diamond materials have unparalleled excellent oxidation resistance and electrochemical stability. In particular, their electrical conductivity can be changed by doping. In addition, diamond electrodes are inert in hydrolysis reactions. But there are also some problems, such as patent CN200610092267 and CN201110033910 embodiment 1 discloses the use of niobium base material with conductive diamond film deposited thereon as an anode, and patent CN201410747989 discloses porous titanium with a diamond film deposited thereon as an anode, because There are processes such as heating and cooling in the application. Whether it is metal niobium or metal titanium, there is an order of magnitude dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/13C25B11/06
CPCC25B1/13C25B11/073Y02E60/36C25B1/04C25B9/73C25B11/075C25B11/043H01M2008/1095H01M4/96H01M8/023H01M4/8605H01M4/90H01M4/9091H01M8/0232H01M8/0234H01M8/1027H01M4/9041Y02E60/50Y02P70/50C25B11/083H01M8/1004C25B11/032
Inventor 张文英钟建华
Owner GUANGZHOU DEPOSON ELECTRIC TECH
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