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Negative electrode, electrolytic cell for electrolysis of alkali metal chloride, and method for producing negative electrode

A manufacturing method and cathode technology, which are applied in the field of ion-exchange membrane salt electrolysis, can solve the problems of platinum shedding, lack of durability, and rise in electrolysis voltage, and achieve the effects of excellent resistance, excellent durability, and low hydrogen overvoltage

Active Publication Date: 2012-09-12
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cathode using platinum alone has the following problems: platinum falls off physically during electrolysis, lacks durability, is easily poisoned by iron ions contained in the electrolytic solution, and electrolysis voltage increases.

Method used

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  • Negative electrode, electrolytic cell for electrolysis of alkali metal chloride, and method for producing negative electrode
  • Negative electrode, electrolytic cell for electrolysis of alkali metal chloride, and method for producing negative electrode
  • Negative electrode, electrolytic cell for electrolysis of alkali metal chloride, and method for producing negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0165] As a conductive base material, a mesh base material obtained by weaving nickel thin wires with a diameter of 0.15 mm in a 40-mesh mesh was used. Sandblasting was performed using alumina powder having a weight average particle diameter of 100 μm or less, followed by acid treatment in 6N hydrochloric acid at room temperature for 5 minutes, followed by water washing and drying.

[0166] Next, palladium nitrate solution (manufactured by Tanaka Kikinzoku, palladium concentration: 100 g / L) and dinitrosodiammine platinum nitric acid solution (manufactured by Tanaka Kikinzoku, platinum concentration: 100 g / L) were mixed so that the molar ratio of palladium and platinum was 1. 1. Prepare the first coating solution.

[0167] At the bottom of the coating roller (roll), a tray with the above-mentioned first coating solution is installed, the coating solution is infiltrated into the coating roller made of EPDM, and a roller is installed on the upper part so that the roller and the c...

Embodiment 2

[0171] A cathode was prepared and evaluated in the same manner as in Example 1, except that the number of times of coating of the first layer was adjusted to one, and the number of times of coating of the second layer was adjusted to four. The amount of platinum contained in this test cathode was about 1.03 times that of the test cathode of Example 1.

[0172] As shown in Table 1, the results of the ion exchange membrane method salt electrolysis test are, 4kA / m 2 The hydrogen overvoltage under the condition is 92mV, and a cathode with low hydrogen overvoltage is obtained. As a result of the reverse current resistance test, the amount of platinum in the cathode after the test was 97% of the platinum amount before the test, and a cathode with strong reverse current resistance was obtained.

Embodiment 3

[0174] A cathode was fabricated and evaluated in the same manner as in Example 1, except that the number of times of coating of the first layer was adjusted to 2, and the number of times of coating of the second layer was adjusted to 4. The amount of platinum contained in this test cathode was about 1.39 times that of the test cathode of Example 1.

[0175] As shown in Table 1, the results of the ion exchange membrane method salt electrolysis test are, 4kA / m 2 The hydrogen overvoltage under the condition is 94mV, and a cathode with low hydrogen overvoltage is obtained. As a result of the reverse current resistance test, the amount of platinum in the cathode after the test was 96% of the platinum amount before the test, and a cathode with strong reverse current resistance was obtained.

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Abstract

Disclosed is a negative electrode, which comprises a conductive base and a catalyst layer formed on the conductive base, and which is characterized in that: the catalyst layer is configured of a first layer and a second layer; the first layer contains at least elemental palladium and elemental platinum; the second layer contains at least elemental iridium and elemental platinum; the first layer is arranged on the conductive base; and the second layer is arranged on the first layer. The negative electrode is useful since the hydrogen overpotential thereof is low and the catalyst layer is not easily deteriorated nor separated due to the reverse current that is generated when the electrolysis is stopped.

Description

technical field [0001] The cathode of the present invention can be used for electrolysis of water or an aqueous solution of an alkali metal compound, and is particularly suitable for electrolysis of common salt by an ion exchange membrane method. Background technique [0002] Reduction of energy consumption (specifically, reduction of electrolysis voltage) ) is an important subject. [0003] As the electrolysis method of alkali metal chloride aqueous solution such as salt water, the ion exchange membrane method has been the main method in recent years, and the electrolysis voltage is divided into anodic reaction (generation of chlorine) in addition to the theoretically required voltage required for salt electrolysis. The overvoltage of the cathode reaction (generating hydrogen), the voltage caused by the resistance of the ion exchange membrane, and the voltage caused by the distance between the electrodes of the anode and cathode. Here, the overvoltage refers to a voltage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/08C23C18/02
CPCC25B1/04C23C18/08C23C18/1651C23C18/1216C25B1/46Y02E60/36C25B11/097
Inventor 船川明恭蜂谷敏德
Owner ASAHI KASEI KK
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