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Electrocatalytic coating composition, dimensionally stable anode, preparation method and application

A coating composition and electrocatalysis technology, applied in chemical instruments and methods, electrodes, electrolysis components, etc., can solve the problem of affecting catalytic effect, current efficiency and electrode life, weakening the precipitation of cluster grains, and uneven catalyst coating. and other problems, to achieve the effect of inhibiting excessive growth, inhibiting crack growth, and improving flatness and quality

Inactive Publication Date: 2020-04-10
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as: adding Sn element to modify Ti / IrO 2 3RuO 2 , changing the crack distribution on the electrode surface, greatly improving the flatness of the electrode; weakening the precipitation of clustered grains and improving the electrocatalytic activity for C1-; but there is still the problem of mixed metal salt shedding caused by solvent volatilization in the electrocatalyst coating step , resulting in waste of precious metals and uneven catalyst coating, which seriously affects the catalytic effect, current efficiency and electrode life of the electrode during operation.

Method used

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  • Electrocatalytic coating composition, dimensionally stable anode, preparation method and application
  • Electrocatalytic coating composition, dimensionally stable anode, preparation method and application
  • Electrocatalytic coating composition, dimensionally stable anode, preparation method and application

Examples

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Effect test

Embodiment 1

[0055] Polish the metal titanium sheet with 800-grit sandpaper, and then polish it with 2000-grit sandpaper; rinse it with ultrapure water, soak it in acetone to degrease; rinse it with acetone twice, and dry it; after that, put the metal titanium sheet into Soak in 3% oxalic acid solution at 90°C for 2 hours, then rinse with water for later use. According to the molar ratio of the three metal salts is Sn / Ru / Ti=x / (3-x) / 7 (x=0.01), the total concentration of the three elements (Sn+Ru+Ti) is 0.4mol / L and weigh TiOSO 4 、RuCl 3 , SnCl 4 And add an appropriate amount of pure water to dissolve to obtain a mixed metal salt precursor solution (referred to as solution A1). Configure 0.05mol / L citric acid solution, measure a sufficient amount of citric acid solution according to the molar ratio of (Sn+Ru+Ti) and citric acid 3:1; COOH / -OH=0.5 Weigh polyethylene glycol with a molecular weight of 1000 and add it to the citric acid solution; obtain a mixed solution of citric acid and gly...

Embodiment 2

[0057] Polish the metal titanium sheet with 800-grit sandpaper, and then polish it with 2000-grit sandpaper; rinse it with ultrapure water, soak it in acetone to degrease; rinse it with acetone for 3 times, and dry it; after that, put the metal titanium sheet into Soak in 3% oxalic acid solution at 90°C for 1 hour, then rinse with water for later use. According to the molar ratio of the three metal salts is Sn / Ru / Ti=x / (3-x) / 7 (x=0.5), the total concentration of the three elements (Sn+Ru+Ti) is 0.3mol / L and weigh TiOSO 4 、RuCl 3 , SnCl 4 And add an appropriate amount of pure water to dissolve to obtain a mixed metal salt precursor solution (referred to as solution A2). Configure 0.08mol / L citric acid solution, measure a sufficient amount of citric acid solution according to the molar ratio of (Sn+Ru+Ti) and citric acid 2:1; COOH / -OH=0.8 Weigh polyethylene glycol with a molecular weight of 800 and add it to the citric acid solution; obtain a mixed solution of citric acid and ...

Embodiment 3

[0059] Polish the metal titanium sheet with 800-grit sandpaper, and then polish it with 2000-grit sandpaper; rinse it with ultra-pure water, soak it in acetone to degrease; rinse it with acetone for 2 to 3 times, and dry it; after that, put the titanium sheet Soak in 3% oxalic acid solution at 90°C for 1 hour, then rinse with water for later use. According to the molar ratio of the three metal salts is Sn / Ru / Ti=x / (3-x) / 7(x=1), the total concentration of the three elements (Sn+Ru+Ti) is 0.2mol / L and weigh TiOSO 4 、RuCl 3 , SnCl 4 And add an appropriate amount of pure water to dissolve to obtain a mixed metal salt precursor solution (referred to as solution A3). Configure 0.1mol / L citric acid solution, measure a sufficient amount of citric acid solution according to the molar ratio of (Sn+Ru+Ti) and citric acid 1:1; COOH / -OH=1 weighing molecular weight is 600 ethylene glycol, and add in the citric acid solution; Obtain the mixed solution of citric acid and dibasic alcohol (re...

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Abstract

The invention relates to an electrocatalytic coating composition, a dimensionally stable anode, a preparation method and application. The electrocatalytic coating composition comprises a precursor solution of a catalytic active component, and an additive, wherein the precursor solution comprises a Ru metal salt, a Ti metal salt and optional one of a Sn metal salt, a Pb metal salt and a Sb metal salt; the additive comprises a polybasic carboxylic acid and a polyhydric alcohol; the ratio of polycarboxylic acid to polyhydric alcohol in the additive is 0.5-1 according to the molar ratio of carboxyl to hydroxyl; the molar ratio of the total mole of the metal elements in the precursor solution of the catalytic active component to the polybasic carboxylic acid is 1: 1-3: 1. The chlorine evolutionpotential of the obtained dimensionally stable anode can be as low as 1.42 V vs.SCE, the difference between the chlorine evolution potential and the oxygen evolution potential reaches 0.57 V vs.SCE,and the polarizability is as low as 0.072 V vs.SCE. The dimensionally stable anode is used for low-concentration electrolysis of a sodium chloride solution, and the electrochemical performance is remarkably improved.

Description

technical field [0001] The invention belongs to the application field of electrochemical catalysis, and in particular relates to an electrocatalytic coating composition, a shape-stable anode, a preparation method and application. Background technique [0002] Hypochlorous acid or hypochlorite disinfectant is the most commonly used and most effective disinfectant in sewage treatment, food industry and environmental protection. It can be prepared by electrochemical catalytic oxidation of salt water. The anode is the source of the electrochemical catalytic oxidation reaction, whether it is direct oxidation or indirect oxidation; the choice of anode material has a crucial impact on the effect of electrochemical water treatment. The factors affecting the concentration of hypochlorous acid or hypochlorite are not only related to factors such as electrode spacing, applied voltage, NaCl concentration, pH value, etc., but also the electrochemical activity of the catalytic coating on ...

Claims

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Application Information

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IPC IPC(8): C25B1/26C25B11/06B01J23/62B01J23/644
CPCC25B1/26B01J23/626B01J23/628B01J23/6445B01J23/002B01J2523/00C25B11/091B01J35/33B01J2523/43B01J2523/47B01J2523/821B01J2523/53B01J2523/44
Inventor 武晓峰陈运法
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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