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Coating solution of coating electrode and preparation method of coating electrode

A coating electrode and solution technology, applied in the field of electrochemistry, can solve the problems of oxidation failure on the surface of the titanium substrate, affecting the electrochemical catalytic performance and service life of the coated titanium electrode, etc., so as to inhibit rapid growth and agglomeration, improve performance, and enhance service life. added effect

Inactive Publication Date: 2018-02-16
GUANGDONG INST OF RARE METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the coated titanium electrode is in use, the gas precipitated on the anode erodes the surface of the titanium substrate through cracks, making the surface of the titanium substrate oxidized and ineffective, seriously affecting the electrochemical catalytic performance and service life of the coated titanium electrode.

Method used

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  • Coating solution of coating electrode and preparation method of coating electrode
  • Coating solution of coating electrode and preparation method of coating electrode
  • Coating solution of coating electrode and preparation method of coating electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: chloroiridic acid: tantalum pentachloride: the percentage mass ratio of citric acid is 57:38:5, the ethylene glycol of volume ratio 1:1 and n-butanol solution, the concentration of chloroiridic acid is 35g / L .

[0024] Preparation method: The preparation method of the coated electrode: put the titanium plate into 4% sodium carbonate solution, boil for 40 minutes, then rinse it with deionized water, and dry it; then put it into 5% oxalic acid solution and boil for 70 minutes, Take it out, rinse it, and dry it; apply the coating solution on the titanium plate with a brush, dry it at 120°C, and then oxidize it in hot air at 480°C for 15 minutes. After cooling, repeat the above process 15 times, and finally, heat treatment at 480°C After 1.5h, it was cooled to room temperature to obtain an iridium-tantalum-coated titanium electrode.

Embodiment 2

[0025] Embodiment 2: chloroiridic acid: tantalum pentachloride: the percentage mass ratio of tartaric acid is 60:36:4, the ethylene glycol and n-butanol solution of volume ratio 1:1, and the concentration of chloroiridic acid is 35g / L.

[0026] Preparation method: The preparation method of the coated electrode: put the titanium plate into 6% sodium carbonate solution, boil for 30 minutes, then rinse it with deionized water, and dry it; then put it into 5% oxalic acid solution and boil for 60 minutes, Take it out, rinse it, and dry it; apply the coating solution on the titanium plate with a brush, dry it at 130°C, and then oxidize it in hot air at 500°C for 18 minutes. After cooling, repeat the above process 17 times, and finally, heat treatment at 500°C After 1.2h, it was cooled to room temperature to obtain an iridium-tantalum-coated titanium electrode.

Embodiment 3

[0027] Embodiment 3: chloroiridic acid: tantalum pentachloride: the percentage mass ratio of malic acid is 57:38:5, the ethylene glycol and n-butanol solution of volume ratio 1:1, and the concentration of chloroiridic acid is 35g / L .

[0028] Preparation method: The preparation method of the coated electrode: put the titanium plate into a 3% sodium carbonate solution, boil for 20 minutes, then rinse it with deionized water, and dry it; then put it into a 5% oxalic acid solution and boil for 50 minutes, Take it out, rinse it, and dry it; apply the coating solution on the titanium plate with a brush, dry it at 140°C, and then oxidize it in hot air at 510°C for 10 minutes. After cooling, repeat the above process for 18 times, and finally, heat treatment at 510°C After 1h, it was cooled to room temperature to obtain an iridium-tantalum-coated titanium electrode.

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Abstract

The invention discloses a coating solution of a coating electrode and a preparation method of the coating electrode. The coating solution is a solution composed of chloro-iridic acid, tantalum pentachloride, alpha-hydroxy acid, glycol and n-butyl alcohol, the volume ratio of the glycol to the n-butyl alcohol is 1 to 1, the concentration of the chloro-iridic acid is 30-38 g / L, and the mass percentof the chloro-iridic acid to the tantalum pentachloride to the alpha-hydroxy acid is 55-62 to 34-40 to 3-7. The preparation method of the coating electrode comprises the steps that a titanium plate isput into a sodium carbonate solution to be boiled, washed thoroughly with deionized water and dried; the titanium plate is put into an oxalic acid solution to be boiled, taken out to be washed thoroughly and dried; and a brush is used for coating the titanium plate with the coating solution, drying and hot air oxidation are carried out, after cooling, the processes are carried out repeatedly, after heat treatment, the coating solution is cooled to the normal temperature, and the coating electrode is prepared. The coating surface of the coating electrode prepared from the coating solution through the preparation method has no obvious cracks, the area of a plane region is large, the plane region is smooth, most crystal grains grow on the plane region, the coating is compact in bonding, thefortified life is obviously prolonged, and the performance is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry. The invention relates to a coating solution for a coated electrode and a method for preparing the coated electrode. In particular, the invention relates to a coating solution of an iridium-tantalum-coated titanium electrode and a preparation method of the coated electrode. Background technique [0002] In the electrochemical system with oxygen evolution reaction as the main reaction, IrO 2 -Ta 2 o 5 Coated titanium electrodes are widely used with excellent performance, IrO 2 As a conductive component, Ta 2 o 5 As a non-conductive oxide, the conductive oxide structure can be made more stable. [0003] CN1995464A provides a method for preparing a nanocrystalline iridium oxide coating electrode, which improves the stability and electrocatalytic performance of the electrode by refining the crystal particle size of the coating to the nanometer level. The IrO prepared by the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/06
CPCC25B1/04C25B11/051C25B11/093Y02E60/36
Inventor 张建华蒋玉思程华月马红星刘斌
Owner GUANGDONG INST OF RARE METALS
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