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Tin oxide-based modified coating for electrode and preparation method of tin oxide-based modified coating

A tin oxide-based, modified coating technology, applied in chemical instruments and methods, coatings, metal material coating technology, etc., can solve the problems of insufficient electrochemical stability, resistance to electrochemical corrosion, poor chemical stability, etc. , to achieve low cost, high chemical and electrochemical stability, and easy design

Pending Publication Date: 2022-04-08
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a tin oxide-based modified coating for electrodes and a preparation method thereof, which solves the problems of poor chemical stability, insufficient electrochemical stability and resistance to electrochemical corrosion of existing tin oxide coated electrodes in acidic solutions , the problem of short service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Select pure titanium sheet TA2 as the substrate, etch with 10% (mass fraction) oxalic acid at 90°C for 3 hours, wash with water and then dry at 120°C to obtain a clean titanium substrate.

[0027] According to the tin-zirconium-antimony metal molar ratio of 72:20:8, alkoxide tin, n-butoxide zirconium and antimony trichloride are dissolved in ethanol-n-butanol mixed solvent with a volume ratio of 1:2 to obtain the total metal mole A coating solution with a concentration of 0.25mol / L.

[0028] Brush evenly on the titanium substrate with a soft brush, then dry and solidify at 120°C for 10 minutes, then thermally oxidize at 480°C for 10 minutes, repeat 14 times, and finally heat treat at 480°C for 1 hour to obtain a tin oxide-based modified coating. layer.

[0029] It is generally believed that the better the chemical stability and electrochemical stability of the coating, the longer the enhanced life of the coated electrode. For ease of comparison, a conventional tin-ant...

Embodiment 2

[0031] Select pure titanium sheet TA2 as the substrate, etch with 10% (mass fraction) oxalic acid at 90°C for 2.5h, wash with water and dry at 110°C to obtain a clean titanium substrate.

[0032] According to the tin-tantalum-antimony molar ratio of 80:15:5, alkoxytin, penta-n-butoxytantalum and antimony chloride were dissolved in ethanol-n-butanol mixed solvent with a volume ratio of 1:1 to obtain the total metal A coating solution with a molar concentration of 0.3mol / L.

[0033] Brush evenly on the titanium substrate with a soft brush, then dry and cure at 120°C for 15 minutes, then thermally oxidize at 500°C for 10 minutes, repeat 18 times, and finally heat treat at 500°C for 1 hour to obtain a tin oxide-based modified coating. layer.

[0034] For the convenience of comparison, a conventional tin antimony oxide coated electrode was prepared, and the enhanced life of the tin oxide-based modified coated electrode and the tin antimony oxide coated electrode of the present inv...

Embodiment 3

[0036] Select pure titanium sheet TA2 as the substrate, etch with 10% (mass fraction) oxalic acid at 95°C for 2 hours, wash with water and then dry at 120°C to obtain a clean titanium substrate.

[0037] According to the tin-niobium-antimony metal molar ratio of 82:10:8, alkoxide tin, n-butoxide niobium and antimony chloride are dissolved in ethanol-n-butanol mixed solvent with a volume ratio of 1:2 to obtain the total metal molar concentration It is 0.2mol / L coating solution.

[0038] Brush evenly on the titanium substrate with a soft brush, then dry and cure at 120°C for 12 minutes, then thermally oxidize at 480°C for 10 minutes, repeat 12 times, and finally heat treat at 490°C for 1 hour to obtain a tin oxide-based modified coating. layer.

[0039] For the convenience of comparison, a conventional tin antimony oxide coated electrode was prepared, and the enhanced life of the tin oxide-based modified coated electrode and the tin antimony oxide coated electrode of the presen...

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Abstract

The invention discloses a tin oxide-based modified coating for an electrode, which is coated on a clean titanium substrate and consists of a tin oxide active component, an inert metal oxide component and a conductive modifier, the coating comprises the following components in percentage by mass: 75-88% of stannic oxide, 10-20% of stannic oxide, 10-20% of stannic oxide and 10-20% of stannic oxide. The inert metal oxide accounts for 4%-17%; 5%-8% of a conductive modifier; the inert metal oxide is one of zirconium oxide, tantalum oxide and niobium oxide; the conductive modifier is antimony oxide; the tin oxide-based modified coating for the electrode is low in cost and high in chemical stability and electrochemical stability, and the problems that an existing tin oxide coating electrode is poor in chemical stability in an acid solution, insufficient in electrochemical stability, not resistant to electrochemical corrosion and short in service life are solved.

Description

Technical field: [0001] The invention relates to a tin oxide-based modified coating for electrodes and a preparation method thereof. Background technique: [0002] Tin oxide electrode is an electrode made by coating or electrodepositing tin oxide active ingredients on the surface of titanium base. Tin oxide electrodes have better catalytic degradation performance for refractory organic pollutants, can be directly oxidized to carbon dioxide and water, and the treatment process is more friendly to the environment, so it has a good application prospect in the field of organic wastewater treatment. From the perspective of conductivity type, the tin oxide coating is a wide bandgap n-type semiconductor. In order to improve the electrical properties of the tin oxide coating, the element antimony is generally doped into the tin oxide lattice to increase the concentration of carrier electrons. At present, the typical tin oxide coated electrode is titanium-based tin antimony oxide e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/04C23C18/12C23F1/26C02F1/461C02F101/30
Inventor 蒋玉思邵彩茹段丽娟朱薇
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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