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Electrode for generation of hydrogen, and electrolysis method

A technology of hydrogen evolution electrode and electrode active material, which is applied in the field of salt electrolysis by ion exchange membrane method, which can solve the problems of reduction of electrode effective area, increase of electrolysis voltage, increase of liquid resistance, etc., and achieves suppression of cathode overvoltage rise and excellent resistance , The effect of improving productivity

Inactive Publication Date: 2012-05-23
DAISO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, in order to improve productivity, the electrolysis current density is generally increased. Under high current density operation, a large amount of gas generated remains on the electrode surface, resulting in a decrease in the effective area of ​​the electrode, and an increase in the liquid resistance leads to an increase in the electrolysis voltage.

Method used

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  • Electrode for generation of hydrogen, and electrolysis method
  • Electrode for generation of hydrogen, and electrolysis method
  • Electrode for generation of hydrogen, and electrolysis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0040] (Example 1-1) (preparation of electrode 1)

[0041] A porous metal mesh (LW: 8.0, SW: 3.6, ST: 1.2 mm) made of nickel metal was used as the electrode substrate. The size of the expanded metal mesh is 20 mm x 20 mm x 1.2 mm thick. A nickel round rod with a diameter of 1.5 mm and a length of 80 mm was welded to the expanded metal plate as a power supply guide rod for energization.

[0042] Use No. 100 artificial corundum to perform sandblasting treatment on the surface of the substrate porous metal mesh with a pressure of 0.3 MPa. After the porous metal mesh was placed in acetone and degreased by ultrasonic cleaning, it was etched at 30° C. for 1 hour using a 10 wt % hydrochloric acid aqueous solution. The etched porous metal mesh was washed in running water for a day and night.

[0043] According to the platinum: cerium molar ratio of 25:75, chloroplatinic acid hexahydrate and cerium nitrate hexahydrate were dissolved and prepared into an aqueous solution containing 6...

Embodiment 1-2

[0044] (Example 1-2) (overvoltage measurement)

[0045] "Electrode 1" prepared in Example 1 only kept the surface and the back of the 20mm×20mm porous part, and the other part was sealed and used as the cathode. A 30mm×30mm×1mm thick nickel plate was used as the anode, 32wt% sodium hydroxide aqueous solution was used as the electrolyte, the distance between the cathode and the anode was 2cm, and the electrolysis experiment was carried out at 80°C. A partially exposed platinum wire wrapped in a tube made of PFA resin (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) was wound around the cathode as a reference electrode. Be careful that the exposed part of the platinum wire does not come into contact with the cathode. The hydrogen evolution overvoltage of the cathode is measured by the constant current method, and the error caused by the liquid resistance due to the voltage drop when the current is cut off is corrected by the current gradient method.

[0046] The rela...

Embodiment 2

[0047] (Example 2) (preparation of electrode 2 and measurement overvoltage)

[0048] As the electrode base, the same nickel metal expanded metal plate and power supply guide rod as in Example 1 were used, and the same surface treatment as in Example 1 was performed.

[0049] According to the platinum: cerium molar ratio of 20:80, dinitrosodiammine platinum and cerium nitrate hexahydrate were dissolved and formulated into an aqueous solution containing 6 wt% nitric acid, which was used as a coating solution for electrode active materials. The amount of platinum metal in the coating solution was 7.5 g / L. The prepared coating solution was coated on both sides of the porous metal mesh, dried at 100° C. for 10 minutes, and then calcined in an electric furnace at 470° C. for 20 minutes. The coating operation (coating, drying, heating) of this electrode active material was repeated 10 times, and "electrode 2" was produced. With the method identical with embodiment 1-2, measure the ...

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Abstract

Disclosed is a cathode for use in an electrolysis process accompanied by the generation of hydrogen, mainly for use in the brine electrolysis in an ion exchange membrane method, in which the increase in an electrolysis voltage can be prevented even when an electrolysis current density is high and the energy cost can be reduced. Specifically disclosed is an electrode for use in the generation of hydrogen, which comprises an electrically conductive metal and an electrode active material that coats the electrically conductive metal and comprises at least one component selected from metal cerium, a cerium oxide and a cerium hydroxide and metal platinum, wherein the electrode active material has such an enormously cerium-rich composition that the molar fractions of platinum and cerium are 15 to 30 mol% and 70 to 85 mol%, respectively, in terms of metal contents.

Description

technical field [0001] The invention relates to a hydrogen evolution electrode and an electrolysis method using the electrode accompanied by hydrogen evolution. The hydrogen evolution electrode is a cathode used in the electrolysis process accompanied by hydrogen evolution, and is mainly used in the electrolysis of table salt by an ion exchange membrane method. Background technique [0002] In the ion exchange membrane electrolysis salt process, reducing energy consumption is the biggest research topic. When analyzing the cell voltage in the ion exchange membrane electrolysis salt method in detail, it is found that in addition to the theoretically required voltage, the voltage generated by the membrane resistance of the ion exchange membrane, the overvoltage between the cathode and the anode, and the overvoltage caused by the electrolytic cell must be added. The voltage generated by the anode-to-cathode distance. Among these voltages, the electrode overvoltage can be reduce...

Claims

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Application Information

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IPC IPC(8): C25B11/08C25B1/02
CPCC25B11/0478C25B11/0484C25B11/091C25B11/093
Inventor 井本裕树长濑学山本富彦山内信次
Owner DAISO CO LTD
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