Carbon Dioxide Gas-Phase Reduction Device and Method for Producing Porous Electrode-Supported Electrolyte Membrane

Patent metadata

Field	Value
Publication number	US-2023160081-A1
Application number	US-202017918061-A
Country	US
Kind code	A1
Filing date	May 21, 2020
Priority date	May 21, 2020
Publication date	May 25, 2023
Grant date	—

Abstract

A gas phase reduction apparatus of carbon dioxide includes an oxidation chamber that includes an oxidation electrode; a reduction chamber that is adjacent to the oxidation chamber and receives supplied carbon dioxide; and a porous electrode-supporting electrolyte membrane that is placed between the oxidation chamber and the reduction chamber. The porous electrode-supporting electrolyte membrane is a joined body including a porous reduction electrode joined to an electrolyte membrane. The electrolyte membrane is placed on the oxidation chamber side. The porous reduction electrode is placed on the reduction chamber side and configured to reduce the carbon dioxide by electrons from the oxidation electrode connected via a conductor.

First claim

1 . A gas phase reduction apparatus of carbon dioxide, comprising:
an oxidation chamber that includes an oxidation electrode; a reduction chamber that is adjacent to the oxidation chamber and receives supplied carbon dioxide; and a porous electrode-supporting electrolyte membrane that is placed between the oxidation chamber and the reduction chamber, the porous electrode-supporting electrolyte membrane being a joined body including a porous reduction electrode joined to an electrolyte membrane, the electrolyte membrane being placed on a side of the oxidation chamber, the porous reduction electrode being placed on a side of the reduction chamber and configured to reduce the carbon dioxide by electrons from the oxidation electrode connected via a conductor.

2 . The gas phase reduction apparatus of carbon dioxide according to claim 1 , further comprising:
a light source for irradiating the oxidation electrode with light.

3 . The gas phase reduction apparatus of carbon dioxide according to claim 1 , further comprising:
a power source connected to the conductor.

4 . The gas phase reduction apparatus of carbon dioxide according to claim 1 , wherein
the oxidation electrode is an n-type semiconductor.

5 . A method for producing a porous electrode-supporting electrolyte membrane used in a gas phase reduction apparatus of carbon dioxide,
the gas phase reduction apparatus of carbon dioxide including: an oxidation chamber that includes an oxidation electrode; a reduction chamber that is adjacent to the oxidation chamber and receives supplied carbon dioxide; and a porous electrode-supporting electrolyte membrane that is placed between the oxidation chamber and the reduction chamber, the porous electrode-supporting electrolyte membrane being a joined body including a porous reduction electrode joined to an electrolyte membrane, the electrolyte membrane being placed on a side of the oxidation chamber, the porous reduction electrode being placed on a side of the reduction chamber and configured to reduce the carbon dioxide by electrons from the oxidation electrode connected via a conductor, the method comprising: a first step of coating an electrolyte dispersion on a surface of the electrolyte membrane; a second step of thermally treating the electrolyte dispersion to form a joining material of an identical component to the electrolyte membrane on a surface of the electrolyte membrane; and a third step of superimposing the porous reduction electrode on a surface of the joining material and applying pressure on the porous reduction electrode while heating such that the electrolyte membrane and the porous reduction are joined together.

6 . The method for producing a porous electrode-supporting electrolyte membrane according to claim 5 , wherein,
in the third step, the pressure is applied to the porous reduction electrode while the porous reduction electrode is heated at a temperature of 60° C. or higher and 150° C. or lower.

7 . The gas phase reduction apparatus of carbon dioxide according to claim 2 , wherein
the oxidation electrode is an n-type semiconductor.

Assignees

• Nippon Telegraph & Telephone

Inventors

• Sato Sayumi
• Uzumaki Yuya
• Ono Yoko
• Komatsu Takeshi

Classifications

• C25B13/00 Primary

  Diaphragms; Spacing elements · CPC title

• C25B3/26 Primary

  of carbon dioxide · CPC title

• C25B9/19

  with diaphragms · CPC title

• C01B32/50

  Carbon dioxide · CPC title

• C25B9/23

  comprising ion-exchange membranes in or on which electrode material is embedded · CPC title