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Home > News > Chemicals

Asahi Kasei nickel-coated absorption layer receives Imperial Invention Prize in Japan

Source：Adsale Plastics Network Date ：2025-06-04 Editor ：RC
Copyright： This article was originally written/edited by Adsale Plastics Network (AdsaleCPRJ.com), republishing and excerpting are not allowed without permission. For any copyright infringement, we will pursue legal liability in accordance with the law.

Asahi Kasei has received the 2025 Imperial Invention Prize for its invention of nickel-coated absorption layer, which extends the service life of electrodes for chlor-alkali electrolysis (patent no. 6120804).


Asahi Kasei_nickel-coated absorption layer_01.JPG

The ion-exchange membrane process for chlor-alkali electrolysis.

 

The Imperial Invention Prize is from the Japan Institute of Invention and Innovation, which is the highest award presented at the 2025 National Commendation for Invention.

 

This honor underscores Asahi Kasei’s commitment to continuous innovation in materials science and electrochemical processes.

 

Nickel-coated absorption layer

 

The awarded nickel-coated absorption layer addresses a long-term key issue of the chlor-alkali electrolysis process. When the electrolysis is stopped, the electrodes—especially the cathode—deteriorate due to reverse current. This leads to problems such as increased power consumption and shortened cathode service life.


Asahi Kasei_nickel-coated absorption layer_02.jpg

Conceptual diagram of the chemical reaction of nickel during electrolysis and when stopped.

 

Conventional measures have used mechanical solutions to suppress such reverse current. However, this approach is susceptible to malfunctions and operator errors, making it challenging to avoid cathode deterioration completely.

 

Installing a reverse current absorption layer with a nickel coating offers an alternative method to eliminate the need for mechanical equipment. When stopping the electrolysis process, the reverse current absorption layer undergoes a chemical reaction with the nickel, preventing cathode degradation and enabling the equipment's stable, long-term operation.


Asahi Kasei_nickel-coated absorption layer_03.jpg

Conceptual diagram of nickel with a specific structure.

 

The nickel-coated reverse current absorption layer overcomes an additional hurdle for electrolyzer operators. Previously, customers often had to compromise porosity for strength and vice versa. Asahi Kasei’s technology remedies this issue with its nickel-coated layer, which is both porous and sturdy while remaining processable over large areas.

 

Commercialization was successfully achieved by applying nickel to a substrate with thermal spraying, which involves heating a material to a molten or near-molten state and applying it onto a surface to form a coating.

 

Chlor-alkali electrolysis equipment incorporating this technical breakthrough has already been adopted by chemical manufacturers worldwide, with market expansion continuing. Asahi Kasei is also investigating the technology’s applicability to other electrolysis processes, such as alkaline water electrolysis for green hydrogen production.


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Source：Adsale Plastics Network Date ：2025-06-04 Editor ：RC
Copyright： This article was originally written/edited by Adsale Plastics Network (AdsaleCPRJ.com), republishing and excerpting are not allowed without permission. For any copyright infringement, we will pursue legal liability in accordance with the law.

Asahi Kasei has received the 2025 Imperial Invention Prize for its invention of nickel-coated absorption layer, which extends the service life of electrodes for chlor-alkali electrolysis (patent no. 6120804).


Asahi Kasei_nickel-coated absorption layer_01.JPG

The ion-exchange membrane process for chlor-alkali electrolysis.

 

The Imperial Invention Prize is from the Japan Institute of Invention and Innovation, which is the highest award presented at the 2025 National Commendation for Invention.

 

This honor underscores Asahi Kasei’s commitment to continuous innovation in materials science and electrochemical processes.

 

Nickel-coated absorption layer

 

The awarded nickel-coated absorption layer addresses a long-term key issue of the chlor-alkali electrolysis process. When the electrolysis is stopped, the electrodes—especially the cathode—deteriorate due to reverse current. This leads to problems such as increased power consumption and shortened cathode service life.


Asahi Kasei_nickel-coated absorption layer_02.jpg

Conceptual diagram of the chemical reaction of nickel during electrolysis and when stopped.

 

Conventional measures have used mechanical solutions to suppress such reverse current. However, this approach is susceptible to malfunctions and operator errors, making it challenging to avoid cathode deterioration completely.

 

Installing a reverse current absorption layer with a nickel coating offers an alternative method to eliminate the need for mechanical equipment. When stopping the electrolysis process, the reverse current absorption layer undergoes a chemical reaction with the nickel, preventing cathode degradation and enabling the equipment's stable, long-term operation.


Asahi Kasei_nickel-coated absorption layer_03.jpg

Conceptual diagram of nickel with a specific structure.

 

The nickel-coated reverse current absorption layer overcomes an additional hurdle for electrolyzer operators. Previously, customers often had to compromise porosity for strength and vice versa. Asahi Kasei’s technology remedies this issue with its nickel-coated layer, which is both porous and sturdy while remaining processable over large areas.

 

Commercialization was successfully achieved by applying nickel to a substrate with thermal spraying, which involves heating a material to a molten or near-molten state and applying it onto a surface to form a coating.

 

Chlor-alkali electrolysis equipment incorporating this technical breakthrough has already been adopted by chemical manufacturers worldwide, with market expansion continuing. Asahi Kasei is also investigating the technology’s applicability to other electrolysis processes, such as alkaline water electrolysis for green hydrogen production.


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Asahi Kasei nickel-coated absorption layer receives Imperial Invention Prize in Japan

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