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High-stability DSA anode for preparing chlorine by electrolysis and preparation method thereof

A high-stability, anode technology, applied in the field of applied electrochemistry, can solve the problems of the cost of Pt and the insignificant effect of chlorine-evolution coating anode, to prevent the formation of high-resistance TiO2, improve electrochemical stability, and enhance bonding force effect

Active Publication Date: 2010-11-10
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

US20080023341, MXPA03013444, and JP2008156684 use precious metals such as Pt and Ir as the intermediate layer, and the electrochemical stability is improved, but there is still a cost problem when using Pt. Although SnSb oxides are cheap, they are currently only used for oxygen evolution coating anodes, while The effect of the chlorine-analyzing coating anode is not obvious

Method used

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  • High-stability DSA anode for preparing chlorine by electrolysis and preparation method thereof
  • High-stability DSA anode for preparing chlorine by electrolysis and preparation method thereof
  • High-stability DSA anode for preparing chlorine by electrolysis and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Cut the titanium substrate 1 into sheet samples with a size of 1 cm×5 cm, wash with alkali to degrease, pickle and etch, then wash and dry. Take appropriate amount of H according to Ir:Mn=7:3 2 IrCl 6 , 50% Mn(NO 3 ) 2 The solution was dissolved in n-butanol as an intermediate protective layer 2 coating solution. According to Ru:Ti:Sn=24:56:20, appropriate amount of ruthenium chloride, titanium trichloride hydrochloric acid solution, and tin chloride are dissolved in isopropanol solution as the surface active layer 3 coating solution. Firstly, the intermediate layer coating solution is evenly coated on the surface of the titanium substrate 1, dried in a 90°C drying oven for 10 minutes, then sintered in a 450°C muffle furnace for 10 minutes, taken out and cooled, and the above steps are repeated 5 times. Then apply the surface layer coating solution evenly on the middle protective layer 2, dry in a 90°C drying oven for 10 minutes, then sinter in a 450°C muffle furnac...

Embodiment 2

[0030] Titanium substrate 1 is treated as in Example 1, and an appropriate amount of H is taken according to Ir:Co=7:3 2 IrCl 6 , Co(NO 3 ) 2 Dissolved in n-butanol as the intermediate protective layer 2 coating solution. Prepare the surface active layer 3 coating solution according to Example 1. Anode No. 2 was prepared according to Example 1. And the anode was subjected to an enhanced life test according to the test method described in Example 1. From image 3 It can be seen that the introduction of Ir 0.7 co 0.3 The anodic strengthening life of the O intermediate protective layer 2 has reached 480h.

Embodiment 3

[0032] The titanium substrate is treated as in Example 1, and an appropriate amount of H is taken according to Ir:Ta:Co=14:6:3 2 IrCl 6 , TaCl 5 , Co(NO 3 ) 2 Dissolved in n-butanol as the intermediate protective layer 2 coating solution. Prepare the surface active layer 3 coating solution according to Example 1. Anode No. 1 was prepared according to Example 1. And the enhanced life test of the anode: the electrolyte is 0.5mol / L H 2 SO 4 Solution, temperature 40°C, high current density 4A / cm 2 , record the time and the corresponding tank pressure change. When the cell pressure rises rapidly by 10V, the anode is considered to be in failure. From Figure 4 It can be seen that the anodic strengthening life of the introduction of the intermediate protective layer 2 has reached 240h.

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Abstract

The invention relates to a high-stability DSA anode for preparing chlorine by electrolysis and a preparation method thereof. The anode comprises a titanium substrate, a middle layer and a surface active layer, wherein the IrxM (1-x) O2 middle layer is arranged between the titanium substrate and the surface layer, and M is Co, Mn or a CoTa mixture; and the components of the surface active layer are RuO2, IrO2, TiO2 and SnO2. The preparation method comprises the following steps: dissolving the components of the middle layer in proportion in isopropanol or n-butanol and other organic solvents, evenly coating on the pretreated substrate, and drying under an infrared lamp or in a drying box; then placing in a muffle furnace for thermal oxidation, and repeating the step for 1 to 10 times; and then coating the blended surface layer solution on the middle layer, repeating the preparation steps for 10 to 20 times, and holding in the muffle furnace. The service life of the anode is greatly prolonged based on the existing industry standards (20h), and the anode can be widely used in electrolyzing seawater antifouling, chlor-alkali industry and cathodic protection and other fields.

Description

Technical field: [0001] The invention belongs to the field of applied electrochemistry, and relates to a high-stability DSA anode for electrolytic chlorine production and a preparation method thereof, in particular to a long-life anode containing an intermediate protective layer and a preparation method thereof. technical background: [0002] In the electrolysis industry, the performance of the anode material determines the key factors of the reliability and energy consumption of an electrolysis system. When the anode for electrolytic chlorine production is working, the anode potential is high, and it is often in contact with highly aggressive media such as wet chlorine gas, nascent oxygen, hydrochloric acid, and hypochlorous acid, requiring the anode material to have high electrochemical stability and catalytic performance. . Preparation of an anode with high electrochemical stability and catalytic performance for popularization and application will have extremely high eco...

Claims

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Application Information

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IPC IPC(8): C25B11/04C25B11/02C25B1/34
Inventor 刘贵昌刘晓军赵岩刘坤王清泉廖永兰
Owner DALIAN UNIV OF TECH
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