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Positive and negative alternate electrolysis-resistance metal oxide electrode

A technology of oxide and oxide coating, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of the reduction of anode chlorine evolution efficiency, metal oxide electrode damage, and influence on electrode stability, etc., to achieve excellent positive resistance The effect of anti-alternating electrolytic performance, slow reduction and consumption, and good protective effect

Active Publication Date: 2009-10-28
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

After a period of use for electrolytic seawater antifouling anodes, the chlorine evolution current efficiency of the anode will be significantly reduced due to deposits such as manganese oxide on the surface, which is more serious when the seawater is polluted
In order to restore the activity of the oxide anode, periodic reverse electrolysis can be used to remove the deposits on the surface of the electrode, but this reverse electrolysis will also affect the stability of the electrode and cause damage to the metal oxide electrode. Metal oxide anodes such as RuO 2 -TiO 2 -IrO 2 , RuO 2 -IrO 2 -SnO 2 Therefore, it is required that the anode for electrolytic seawater antifouling should also have good resistance to positive and negative alternating electrolysis

Method used

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  • Positive and negative alternate electrolysis-resistance metal oxide electrode
  • Positive and negative alternate electrolysis-resistance metal oxide electrode
  • Positive and negative alternate electrolysis-resistance metal oxide electrode

Examples

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Embodiment 1

[0012] Using TA2 industrial pure titanium plate as the electrode substrate, the surface of the titanium plate test piece after sandblasting treatment was rinsed with water, and then etched in an oxalic acid solution with a temperature of 90°C and a concentration of 10% (mass fraction) for 2 hours to obtain Uniform rough surface; the oxide coating is prepared by the sol-gel method: first, citric acid and ethylene glycol are miscible, and the molar ratio of the two is 1:5, and then chloroiridic acid, tantalum pentachloride and chlorine Platinic acid is added in the mixed solution of citric acid and ethylene glycol by a certain Ir: Ta: Pt molar ratio (see Table 1 for details), and the solvent is adjusted so that the molar concentration of the metal in the solution is 0.25mol / L; Stir to obtain a colloidal solution containing mixed metal ions; paint the colloidal solution on the treated titanium test piece, dry it with an infrared lamp, and then thermally oxidize it at 500°C for 10 ...

Embodiment 2

[0017] Adopt the same method as embodiment 1 to form IrO on the titanium substrate 2 -Ta 2 o 5 -PtO x Coating, its composition Ir:Ta:Pt molar ratio is 68:30:2, coating loading is about 6g / m 2 , and then prepare IrO on it 2 -RuO 2 -SnO 2 Oxide coating to form a composite electrode embedded in the middle layer; the surface layer was prepared by thermal decomposition: chloroiridic acid, ruthenium trichloride, and tin tetrachloride were added to ethyl alcohol at a molar ratio of Ru:Ir:Sn of 20:20:60. In the propanol solution, a coating solution is formed; the solution is painted on the electrode coated with the intermediate layer, dried with an infrared lamp to form a gel, and then thermally oxidized at a temperature of 450 ° C for 10 minutes to obtain a mixed metal oxide film layer. Repeat the above brushing, drying and thermal oxidation process several times to make the oxide load in the surface coating reach about 12g / m 2 ; In addition, using the same composition and pro...

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Abstract

The invention relates to a positive and negative alternate electrolysis-resistance metal oxide electrode, which is suitable to be used in the field of electrochemical industry, such as high-speed steel plate plating, sea water electrolysis marine biofouling-resistance devices, sodium hypochlorite electrolysis production devices, sewage treatment, cathodic protection and other technical fields of electrochemistry. The positive and negative alternate electrolysis-resistance metal oxide electrode consists of a titanium substrate and a platinum-containing multielement mixed metal oxide coating formed on the titanium substrate by a pyrolytic process or a sol-gel method, wherein the mass percentage purity of the metal titanium substrate is over 99 percent; valve metal titanium has excellent mechanical property and machinability and is suitable for making electrode substrates, and the electrode titanium substrate is netty, platy, tubular or bar structural shapes; the platinum-containing multielement mixed metal oxide coating is IrO2-Ta2O5-PtOx, wherein the mole ratio of the Ir to Ta to Pt is (40-70):(20-40):(1-20); and the metal oxide electrode is obviously improved in positive and negative alternate electrolysis resistance and comprehensive performance, and is simple in structure and long in service life.

Description

Technical field: [0001] The invention relates to a metal oxide electrode resistant to positive and negative alternating electrolysis. The electrode is suitable for the field of electrochemical industry, such as high-speed electroplating of steel plates, electrolytic seawater anti-sea biofouling device, sodium hypochlorite electrolysis production device, sewage treatment, cathodic protection, etc. Electrochemical technology field. Background technique: [0002] The anode used in the electrolysis industry requires good electrocatalytic activity in order to reduce the tank pressure of the electrolytic cell and improve the electrolysis efficiency; at the same time, it also needs to have high stability and long service life. Conventional RuO 2 -TiO 2 Metal oxide anodes and oxide anodes modified by adding a small amount of Ir, Sn, Co, etc. on this basis have good electrocatalytic activity, but their stability needs to be improved, especially under the condition of aerobic precip...

Claims

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Application Information

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IPC IPC(8): C25B11/10C23C18/02C23C20/08C25D17/10C23F13/12C02F1/46
Inventor 许立坤唐益辛永磊王均涛
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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