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Metal anode for aqueous solution electrolysis system

A metal anode and aqueous solution technology, applied in the direction of electrolysis components, electrolysis process, electrode shape/type, etc., can solve the problems of high cell voltage and high power consumption required for production, reduce the overpotential of oxygen evolution and increase the electrochemical active surface area Effect

Inactive Publication Date: 2011-10-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the electrolysis process, oxygen is evolved at the anode and hydrogen is evolved at the cathode. The cell voltage during operation is as high as 2.5-2.9V, and the power consumption required for production is relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] After the titanium plate obtained by powder metallurgy is washed with alkali to remove oil and water, it is etched in oxalic acid solution (10%) for 3 hours, and then placed in distilled water for later use. Chloroiridic acid (H 2 IrCl 6 ·6H 2 O, AR, Beijing Institute of Nonferrous Metals), n-butanol and concentrated hydrochloric acid were mixed evenly at a volume ratio of 1:10:1, and evenly coated on the above-mentioned powder metallurgy titanium substrate with a soft woolen brush, and dried at 120 ° C 10min, and then baked at a predetermined temperature of 450°C for 15min, and repeated the coating-drying-baking process 4 times to obtain a powder metallurgy titanium-based iridium-coated electrode.

[0018] The performance of the electrode is detected by an ionic membrane electrolyzer. The powder metallurgy titanium-based iridium-coated electrode is used as the anode, the nickel-coated ruthenium electrode is used as the cathode, the cationic membrane is used as the se...

Embodiment 2

[0020] After the powder metallurgy titanium plate was washed with alkali to remove oil and water, it was etched in oxalic acid solution (10%) for 3 hours, and then placed in distilled water for later use. Ruthenium trichloride (RuCl 3 ·nH 2 (O, GR, Shanghai Sinopharm Chemical Reagent Co., Ltd.), n-butanol and concentrated hydrochloric acid were mixed evenly at a volume ratio of 1:10:1, and were evenly coated on the above-mentioned Ti powder metallurgy material substrate with a soft woolen brush pen. Drying at low temperature for 10 minutes, and then firing at a predetermined temperature of 450°C for 15 minutes, and repeating the coating-drying-baking process 4 times to obtain a powder metallurgy titanium-based ruthenium-coated electrode.

[0021] The performance of the electrode is detected by an ionic membrane electrolyzer. The powder metallurgy titanium-based ruthenium-coated electrode is used as an anode, the nickel-coated ruthenium electrode is used as a cathode, the cati...

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Abstract

The invention provides a metal anode for an aqueous solution electrolysis system. The metal anode is characterized in that a porous metal material is adopted to serve as a matrix, and the surface of the porous metal material is loaded with a highly active catalyst. The porous metal material has a large specific surface area and is advantageous for increasing electrode active area, reducing current density and loading the catalyst. The porous metal material can be prepared by adopting a powder metallurgic method. The metal anode provided by the invention can be used for the aqueous solution electrolysis system, particularly a membrane electrolytic sodium carbonate solution system, and can be used for decreasing e oxygen evolution over potential to reduce power consumption.

Description

technical field [0001] The invention belongs to the field of aqueous solution electrolysis, and relates to an oxygen evolution electrode, in particular a porous metal electrode, which uses its high specific surface area to reduce the oxygen evolution potential. Background technique [0002] The theoretical electrolysis voltage for electrolyzing water to produce hydrogen and oxygen is 1.23V, but in fact, due to the overpotential, electrolyte resistance and other resistance factors in the reaction process of oxygen and hydrogen formation, the actual required voltage is higher than the theoretical value. Between 1.65-2.4V. The existence of overpotential increases the energy consumption of electrolyzed water. According to Faraday's law, the preparation of 1m 3 (Standard) hydrogen, the theoretical power consumption is 2.87kWh, but the actual power consumption is twice the theoretical power consumption. Therefore, we should try to reduce the electrode overpotential to reduce the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/03C25B1/10
CPCY02E60/36
Inventor 陈咏梅姚宁宁钮因健余章龙万平玉
Owner BEIJING UNIV OF CHEM TECH
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