Reduction Electrode and Manufacturing Method of Reduction Electrode

Patent metadata

Field	Value
Publication number	US-2025333861-A1
Application number	US-202218870233-A
Country	US
Kind code	A1
Filing date	Jun 1, 2022
Priority date	Jun 1, 2022
Publication date	Oct 30, 2025
Grant date	—

Abstract

A reduction electrode that is disposed in contact with an electrolyte film on a reduction tank side, the electrolyte film being installed between an oxidation tank and the reduction tank, and is used in a carbon dioxide reduction device that performs a carbon dioxide reduction reaction by bringing carbon dioxide into direct contact, the reduction electrode including: a protrusion-recess structure and a void hole] on the reduction tank side, in which the protrusion-recess structure includes a water-repellent film capable of sliding down a liquid attached to a surface.

First claim

1 . A reduction electrode that is disposed in contact with an electrolyte film on a reduction tank side, the electrolyte film being installed between an oxidation tank and the reduction tank, and is used in a carbon dioxide reduction device that performs a carbon dioxide reduction reaction by bringing carbon dioxide into direct contact, the reduction electrode comprising:
a protrusion-recess structure and a void hole on the reduction tank side, wherein the protrusion-recess structure includes a water-repellent agent capable of sliding down a liquid attached to a surface.

2 . The reduction electrode according to claim 1 , wherein
the oxidation tank performs an oxidation reaction of water with light energy by using an electrolytic solution of the oxidation tank and an oxidation electrode of a semiconductor immersed in the electrolytic solution, and the reduction tank performs a carbon dioxide reduction reaction using the reduction electrode connected to the oxidation electrode via a conductive wire and carbon dioxide brought into direct contact with the reduction electrode.

3 . The reduction electrode according to claim 1 , wherein
the oxidation tank performs an oxidation reaction of water with electrical energy by using an electrolytic solution of the oxidation tank and an oxidation electrode of metal immersed in the electrolytic solution, and the reduction tank performs a carbon dioxide reduction reaction by using the reduction electrode connected to a source of the electrical energy and carbon dioxide brought into direct contact with the reduction electrode.

4 . A reduction electrode manufacturing method for manufacturing the reduction electrode according to claim 1 , the reduction electrode manufacturing method performing:
a step of forming a protrusion-recess structure and a void hole in the reduction electrode; a step of immersing the reduction electrode in a solvent containing a water-repellent agent; a step of drying the reduction electrode to remove the solvent; and a step of removing a water-repellent layer around the void hole of the reduction electrode.

5 . A reduction electrode manufacturing method for manufacturing the reduction electrode according to claim 1 , the reduction electrode manufacturing method performing:
a step of forming a protrusion-recess structure and a void hole in the reduction electrode; a step of putting the reduction electrode and a water-repellent agent into a container and heating the reduction electrode and the water-repellent agent; and a step of removing a water-repellent layer around the void hole of the reduction electrode.

6 . A reduction electrode manufacturing method for manufacturing the reduction electrode according to claim 1 , the reduction electrode manufacturing method performing:
a step of forming a protrusion-recess structure and a void hole in the reduction electrode; a step of bringing the protrusion-recess structure of the reduction electrode into contact with a solvent containing a water-repellent agent; and a step of drying the reduction electrode to remove the solvent.

7 . A reduction electrode manufacturing method for manufacturing the reduction electrode according to claim 2 , the reduction electrode manufacturing method performing:
a step of forming a protrusion-recess structure and a void hole in the reduction electrode; a step of immersing the reduction electrode in a solvent containing a water-repellent agent; a step of drying the reduction electrode to remove the solvent; and a step of removing a water-repellent layer around the void hole of the reduction electrode.

8 . A reduction electrode manufacturing method for manufacturing the reduction electrode according to claim 3 , the reduction electrode manufacturing method performing:
a step of forming a protrusion-recess structure and a void hole in the reduction electrode; a step of immersing the reduction electrode in a solvent containing a water-repellent agent; a step of drying the reduction electrode to remove the solvent; and a step of removing a water-repellent layer around the void hole of the reduction electrode.

9 . A reduction electrode manufacturing method for manufacturing the reduction electrode according to claim 2 , the reduction electrode manufacturing method performing:
a step of forming a protrusion-recess structure and a void hole in the reduction electrode; a step of putting the reduction electrode and a water-repellent agent into a container and heating the reduction electrode and the water-repellent agent; and a step of removing a water-repellent layer around the void hole of the reduction electrode.

10 . A reduction electrode manufacturing method for manufacturing the reduction electrode according to claim 3 , the reduction electrode manufacturing method performing:
a step of forming a protrusion-recess structure and a void hole in the reduction electrode; a step of putting the reduction electrode and a water-repellent agent into a container and heating the reduction electrode and the water-repellent agent; and a step of removing a water-repellent layer around the void hole of the reduction electrode.

11 . A reduction electrode manufacturing method for manufacturing the reduction electrode according to claim 2 , the reduction electrode manufacturing method performing:
a step of forming a protrusion-recess structure and a void hole in the reduction electrode; a step of bringing the protrusion-recess structure of the reduction electrode into contact with a solvent containing a water-repellent agent; and a step of drying the reduction electrode to remove the solvent.

12 . A reduction electrode manufacturing method for manufacturing the reduction electrode according to claim 3 , the reduction electrode manufacturing method performing:
a step of forming a protrusion-recess structure and a void hole in the reduction electrode; a step of bringing the protrusion-recess structure of the reduction electrode into contact with a solvent containing a water-repellent agent; and a step of drying the reduction electrode to remove the solvent.

Assignees

• Nippon Telegraph & Telephone

Inventors

• Kono Akihiro
• Uzumaki Yuya
• Sato Sayumi
• Komatsu Takeshi

Classifications

• C25B3/03

  Acyclic or carbocyclic hydrocarbons · CPC title

• C25B3/07

  Oxygen containing compounds · CPC title

• C25B11/052

  Electrodes comprising one or more electrocatalytic coatings on a substrate · CPC title

• C25B1/55

  Photoelectrolysis · CPC title

• C25B3/25

  Reduction · CPC title