A kind of preparation method of gas-permeable chlorine-analysis electrode

A chlorine evolution electrode, electrodeposition technology, applied in the direction of electrode, electrode shape/type, electrolysis components, etc., can solve the problems of high operating cost of sodium hypochlorite generator, poor conductivity of inert film, low electrode current efficiency, etc., to achieve good conductivity , The effect of improving adhesion and increasing the number of active points

Active Publication Date: 2019-12-13
AWS ENVIRONMENT TECH LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method improves the adhesion between the titanium substrate and the coating, the inert film has poor conductivity and poor oxygen penetration resistance, resulting in reduced current efficiency and poor corrosion resistance of the electrode, which increases the power consumption and salt consumption of the sodium hypochlorite generator. The short service life of electrodes is not conducive to energy saving and consumption reduction
[0004] The patent CN02804636.6 electrode coating and its use and preparation method discloses an electrode coating prepared by electrodeposition method for sodium chlorate. Although the preparation process of electrodeposition method is relatively simple, titanium plate or titanium tube is used as the electrode coating in this patent. The matrix carrying metal oxides appears to have a small specific surface area, resulting in low electrode electrolysis efficiency and high operating costs for sodium hypochlorite generators

Method used

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preparation example Construction

[0028] A kind of preparation method of air gas analysis chlorine electrode, comprises the following steps:

[0029] 1) Substrate treatment: Porous titanium is used as the substrate, and the porous titanium is prepared by vacuum sintering method. The obtained porous titanium has a porosity of 30%-45%, a pore diameter of 5μm-20μm, and a thickness of 1mm. Vibrate in a NaOH solution with a concentration of 10% for 30 minutes to remove surface oil stains, and then use an oxalic acid solution with a concentration of 20% to perform surface pretreatment on the porous titanium to remove surface oxides to obtain a titanium matrix;

[0030] 2) Preparation of precursor deposition bath: add 80-150mL of absolute ethanol, 10-16mL of deionized water, and 10-20mL of precursor into the HCl solution, and then adjust the pH to 1-5 to obtain a precursor deposition bath;

[0031] 3) Preparation of deposition layer: add the precursor deposition bath obtained in step 2) to the electrolytic cell of th...

Embodiment 1a

[0046] A kind of preparation method of air gas analysis chlorine electrode, comprises the following steps:

[0047] 1) Substrate treatment: Porous titanium is used as the substrate, and the porous titanium is prepared by vacuum sintering method. The obtained porous titanium has a porosity of 35%, a pore diameter of 9 μm, and a thickness of 1 mm. The porous titanium is first placed in a concentration of 10%. Vibrated in NaOH solution for 30 minutes to remove surface oil, and then use 20% oxalic acid solution to pretreat the surface of porous titanium to remove surface oxides to obtain a titanium matrix;

[0048] 2) Precursor deposition bath preparation: Add 80-150mL of absolute ethanol, 10-16mL of deionized water, and 10-20mL of IrCo solution into the HCl solution, and then adjust the pH to 2 to obtain a precursor deposition bath;

[0049] 3) Preparation of deposition layer: add the precursor deposition bath obtained in step 2) to the electrolytic cell of the three-electrode sy...

Embodiment 1b

[0056] A kind of preparation method of air gas analysis chlorine electrode, comprises the following steps:

[0057] 1) Substrate treatment: Porous titanium is used as the substrate, and the porous titanium is prepared by vacuum sintering method. The obtained porous titanium has a porosity of 35%, a pore diameter of 11 μm, and a thickness of 1 mm. The porous titanium is first placed in a concentration of 10%. Vibrated in NaOH solution for 30 minutes to remove surface oil, and then use 20% oxalic acid solution to pretreat the surface of porous titanium to remove surface oxides to obtain a titanium matrix;

[0058] 2) Precursor deposition bath preparation: add 80-150mL of absolute ethanol, 10-16mL of deionized water, and 10-20mL of IrSn solution into the HCl solution, and then adjust the pH to 3 to obtain a precursor deposition bath;

[0059] 3) Preparation of deposition layer: add the precursor deposition bath obtained in step 2) to the electrolytic cell of the three-electrode s...

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Abstract

The invention discloses a preparing method for an air-permeable chlorine-evolution electrode. The preparing method comprises the following steps of (1) base body treatment, (2) precursor deposition bath preparing, (3) deposited layer preparing, (4) thin film middle layer preparing, (5) active solution preparing, and (6) sintering. The preparing method for the air-permeable chlorine-evolution electrode of a novel sodium hypochlorite generator is low in chlorine evolution potential, long in service life, high in electrolytic efficiency and low in operating cost.

Description

technical field [0001] The invention relates to a sodium hypochlorite generator electrode, in particular to a preparation method of a gas-permeable chlorine-analysis electrode. Background technique [0002] With the continuous pollution of water resources on the earth and the continuous shortage of water resources, disinfection water treatment is becoming more and more important. Compared with other disinfection technologies, the preparation of sodium hypochlorite on site has obvious advantages, but the sodium hypochlorite generators currently on the market have power consumption. Problems such as high salt consumption and short electrode service life seriously restrict its large-scale application. The key to affecting the performance of sodium hypochlorite generators and restricting its application lies in the electrode material. [0003] Patent CN201210172519.9 A preparation method of a titanium anode discloses a preparation method of a titanium anode, which first deposits...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/26C25B11/03C25B11/10
CPCC25B1/26C25B11/031C25B11/051
Inventor 倪康祥赵皓翰
Owner AWS ENVIRONMENT TECH LTD
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