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Oxygen evolution inhibitor for electrode coating and preparation method thereof

An electrode coating and inhibitor technology, applied in electrodes, electrolysis components, electrolysis process, etc., can solve the problems of low oxygen evolution potential, fast oxygen evolution rate, delaying the normal operation of sodium hypochlorite generator, etc. The effect of reducing the evolution of oxygen

Active Publication Date: 2019-07-19
AWS ENVIRONMENT TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the electrode life of sodium hypochlorite generators currently on the market is short, and the electrode failure occurs after the equipment has been in operation for about 1-2 years, so it has to be stopped to replace the electrode
Therefore, electrode failure not only increases the cost of equipment, but also delays the normal operation of the sodium hypochlorite generator, causing huge economic losses
The root cause of electrode failure is that the oxygen evolution potential of the electrode is too low and the oxygen evolution rate is too fast during the electrolysis process, and the generated oxygen easily penetrates the coating and reacts with the titanium substrate to form non-conductive TiO 2 , so that the substrate is passivated and the electrode fails

Method used

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  • Oxygen evolution inhibitor for electrode coating and preparation method thereof
  • Oxygen evolution inhibitor for electrode coating and preparation method thereof
  • Oxygen evolution inhibitor for electrode coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0043] In embodiment 1-5, the molar percentage composition of each component ion and ion is shown in the table below:

[0044] Table 1 embodiment 1-5 component and proportioning ratio

[0045] Antimony ion Chromium ion Cerium ion cobalt ion iron ion Example 1 83mol% - 17mol% - - Example 2 73mol% - - 27mol% - Example 3 52.5mol% 32.5mol% 15mol% - - Example 4 57.5mol% - 22.5mol% - 20mol% Example 5 45mol% - 20mol% 35mol% -

[0046] - Indicates that it does not contain this component

[0047] Wherein, the antimony ion of embodiment 1 comes from antimony pentachloride, antimony pentafluoride, and cerium ion comes from cerium nitrate; The antimony ion of embodiment 2 comes from sodium antimonate, and cobalt ion comes from cobalt chloride, cobalt carbonate; Antimony ions come from antimony pentachloride, chromium ions come from chromium nitrate, chromium sulfate, cerium ions come from cerium chlori...

experiment example

[0050] The oxygen evolution inhibitors of Examples 1-5 were introduced into the electrodes of the sodium hypochlorite generator, and the effects of oxygen evolution reaction, potential difference, and enhanced life of the electrodes of the sodium hypochlorite generator were tested.

[0051] The experimental steps are as follows:

[0052] (1) Use a titanium plate with a titanium content of 99.9% and a thickness of 1 mm as the substrate. After the titanium plate is sandblasted and polished to remove the oxide layer, it is placed in a NaOH solution with a concentration of 10% and shaken for 30 minutes, and then the oxalic acid with a concentration of 20% The solution etches the titanium plate for 2 hours, and after cleaning, place it in an ethanol solution for use;

[0053](2) Preparation of active coating solution: use n-butanol: isopropanol = 2:1 mixed solution as solvent, ruthenium trichloride, chloroiridic acid, tetrabutyl titanate, oxygen evolution inhibitor as solute, and ...

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Abstract

The invention discloses an oxygen evolution inhibitor of an electrode coating and a preparation method of the oxygen evolution inhibitor. The oxygen evolution inhibitor is prepared from two or more of an antimony-containing compound, a chrome-containing compound, a cerium-containing compound, a cobalt-containing compound and an iron-containing compound. The oxygen evolution inhibitor for the sodium hypochlorite generator electrode coating can promote the oxygen evolution potential of a sodium hypochlorite generator electrode to be high, is small in oxygen evolution rate and enables the electrodes to be long in service life. The preparation method of the oxygen evolution inhibitor is further included. The preparation method is simple in step and easy to operate and facilitates large-scale industrial production.

Description

technical field [0001] The invention relates to an oxygen evolution inhibitor, in particular to an electrode coating oxygen evolution inhibitor and a preparation method thereof. Background technique [0002] Water is the source of life. With the continuous pollution and shortage of water resources on the earth, disinfection water treatment is becoming more and more important. At present, in terms of the types of water disinfection, there are chlorine, sodium hypochlorite, chloramine, Ultraviolet lamp disinfection mode; in the above disinfection modes, due to the increase of various organic substances in groundwater quality in recent years, the use of chlorine disinfection will produce mutagenic and carcinogenic organic compounds such as trihalomethanes; chloramine disinfection requires a longer period of time. The contact time and operation are more complicated, and the bactericidal effect of chloramine is poor; while the ultraviolet sterilizing effect is only effective duri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/26C25B11/04
CPCC25B1/265C25B11/091
Inventor 倪康祥赵皓翰
Owner AWS ENVIRONMENT TECH LTD
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