Air permeable electrode and preparation method thereof

A technology of electrodes and working electrodes, which is applied in the field of electrodes, can solve the problems of reduced electrode current efficiency, short electrode service life, increased power consumption and salt consumption, etc., and achieve dense oxide coating, increased specific surface area, and improved electrolysis efficiency. Effect

Inactive Publication Date: 2017-09-08
AWS ENVIRONMENT TECH LTD
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  • Abstract
  • Description
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  • 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 [catalyst 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 supporting material in this patent. The metal oxide matrix appears to have a small specific surface area, resulting in low electrode electrolysis efficiency and high operating costs for the sodium hypochlorite generator

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Embodiment 1

[0024] A method for preparing a gas-permeable electrode, comprising the following steps:

[0025] 1) Making a porous titanium substrate: a porous titanium plate with a porosity of 35%, a pore diameter of 7 μm, and a thickness of 1 mm was prepared as a titanium substrate by vacuum sintering;

[0026] 2) Surface treatment of the titanium substrate: place the titanium substrate in a 10wt% NaOH solution and vibrate for 30 minutes, rinse and dry, place it in a 20wt% oxalic acid solution and boil for 2 hours, take it out, rinse it and set it aside;

[0027] 3) Precursor deposition: place the titanium substrate treated in step 2) in an aqueous ethanol solution containing titanium chloride, ruthenium chloride, and iridium chloride at a pH of 3 for deposition; wherein in the aqueous ethanol solution, the volume ratio of ethanol to water is It is 25:3; the concentration of titanium chloride is 54mM / L, the concentration of ruthenium chloride is 14mM / L, and the concentration of iridium ch...

Embodiment 2

[0031] A method for preparing a gas-permeable electrode, comprising the following steps:

[0032] 1) Making a porous titanium substrate: a porous titanium plate with a porosity of 38%, a pore diameter of 11 μm, and a thickness of 1 mm was prepared as a titanium substrate by vacuum sintering;

[0033] 2) Surface treatment of the titanium substrate: place the titanium substrate in a 10wt% NaOH solution and vibrate for 30 minutes, rinse and dry, place it in a 20wt% oxalic acid solution and boil for 2 hours, take it out, rinse it and set it aside;

[0034] 3) Precursor deposition: place the titanium substrate treated in step 2) in an aqueous ethanol solution containing titanium chloride, ruthenium chloride, and iridium chloride at a pH of 2 for deposition; in the aqueous ethanol solution, the volume ratio of ethanol to water is It is 10:1; the concentration of titanium chloride is 57mM / L, the concentration of ruthenium chloride is 16mM / L, and the concentration of iridium chloride ...

Embodiment 3

[0039] A method for preparing a gas-permeable electrode, comprising the following steps:

[0040] 1) Making a porous titanium substrate: a porous titanium plate with a porosity of 40%, a pore diameter of 13 μm, and a thickness of 1 mm was prepared as a titanium substrate by vacuum sintering;

[0041] 2) Surface treatment of the titanium substrate: place the titanium substrate in a 10wt% NaOH solution and vibrate for 30 minutes, rinse and dry, place it in a 20wt% oxalic acid solution and boil for 2 hours, rinse well, and set aside;

[0042] 3) Precursor deposition: place the titanium substrate treated in step 2) in an aqueous ethanol solution containing titanium chloride, ruthenium chloride, and iridium chloride at a pH of 3 for deposition; wherein in the aqueous ethanol solution, the volume ratio of ethanol to water is It is 10:1; the concentration of titanium chloride is 64mM / L, the concentration of ruthenium chloride is 18mM / L, and the concentration of iridium chloride is 11...

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Abstract

The invention discloses a preparation method of an air permeable electrode. The preparation method comprises the following steps that (1), a porous titanium substrate is made; (2), the surface of the titanium substrate is treated; (3), the precursor is deposited, specifically, the titanium substrate is placed in an ethanol aqueous solution, containing titanium dichloride, ruthenium chloride and iridium chloride, with the pH value being 1-5 to be deposited; (4), electrolyzing is conducted; and (5), sintering is conducted, and the air permeable electrode is obtained. The obtained air permeable electrode is large in effective specific area, the NaClO yield of the air permeable electrode is much higher than that of a traditional electrode, salt consumption and electricity consumption are low, and energy saving and emission reduction are achieved.

Description

technical field [0001] The invention relates to the field of electrodes, in particular to a gas-permeable electrode and a preparation method thereof. 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 current sodium hypochlorite disinfection has obvious advantages. However, sodium hypochlorite generators currently on the market have problems such as high power consumption and salt consumption, and short service life of electrodes, which seriously restrict their large-scale application. The key to affecting the performance of sodium hypochlorite generators and restricting their application lies in electrode materials. [0003] The patent [a preparation method of a titanium anode] discloses a preparation method of a titanium anode, which first deposits an inert film on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/26C25B11/03C25B11/10C25B11/06C25D9/08
CPCC25B1/26C25D9/08C25B11/031C25B11/051C25B11/093
Inventor 倪康祥赵皓翰
Owner AWS ENVIRONMENT TECH LTD
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