Carbon dioxide electrolysis device

Patent metadata

Field	Value
Publication number	US-12529155-B2
Application number	US-202217652306-A
Country	US
Kind code	B2
Filing date	Feb 24, 2022
Priority date	Mar 18, 2021
Publication date	Jan 20, 2026
Grant date	Jan 20, 2026

Abstract

A carbon dioxide electrolytic device includes an anode configured to oxidize water or a hydroxide ion and thus generate oxygen; an anode solution flow path configured to supply an anode solution to the anode; a cathode configured to reduce carbon dioxide and thus generate a carbon compound; a gas flow path configured to supply a gas to the cathode, the gas containing carbon dioxide; and a diaphragm provided between the anode and the cathode and including a porous film. The porous film includes a first porous surface provided on an anode side and having a first average pore size, and a second porous surface provided on a cathode side and having a second average pore size. The first average pore size is larger than the second average pore size.

First claim

What is claimed is:

1 . A carbon dioxide electrolytic device comprising:
an anode configured to oxidize water or a hydroxide ion and thus generate oxygen; an anode solution flow path configured to supply an anode solution to the anode; a cathode configured to reduce carbon dioxide and thus generate a carbon compound; a gas flow path configured to supply a gas to the cathode, the gas containing carbon dioxide; and a diaphragm provided between the anode and the cathode and including a porous film, wherein the porous film includes
a first porous surface provided on an anode side and having a first average pore size, and
a second porous surface provided on a cathode side and having a second average pore size,
the first average pore size is 1.1 or more times the second average pore size, the first average pore size is 1 nm or more and 50 μm or less, and the second average pore size is 1 nm or more and 500 nm or less.

2 . The device according to claim 1 , wherein
the cathode is provided on the second porous surface.

3 . The device according to claim 1 , further comprising
a cathode solution flow path configured to supply a cathode solution to the cathode.

4 . The device according to claim 3 , wherein
the cathode has a first surface facing on the gas flow path and a second surface facing on the cathode solution flow path; and the cathode solution flow path is provided between the diaphragm and the cathode such that the cathode solution is in contact with the second porous surface and the cathode.

5 . The device according to claim 3 , wherein
the cathode solution contains at least one ion selected from the group consisting of a phosphate ion, a borate ion, a sodium ion, a potassium ion, a calcium ion, a lithium ion, a cesium ion, a magnesium ion, a chloride ion, a hydrogen carbonate ion, and a carbonate ion.

6 . The device according to claim 1 , wherein
the anode solution contains at least one ion selected from the group consisting of a phosphate ion, a borate ion, a sodium ion, a potassium ion, a calcium ion, a lithium ion, a cesium ion, a magnesium ion, a chloride ion, a hydrogen carbonate ion, and a carbonate ion.

7 . The device according to claim 1 , wherein
a thickness of the diaphragm is 5 μm or more and 500 μm or less.

8 . The device according to claim 1 , wherein
the porous film contains at least one material selected from the group consisting of a metal oxide, a metal hydroxide, a metal nitrate, a metal sulfate, ceramics, glass, polytetrafluoroethylene, polychlorotrifluoroethylene, polyetheretherketone, polyethylene, polyethylene terephthalate, polybutylene terephthalate, cellulose acetate, nitrocellulose, polyphenylsulfone, polyphenylene sulfide, polysulfone, polyethersulfone, polyacrylonitrile, polyetherimide, polyamideimide, polyvinylidene fluoride, polycarbonate, polyester, polybenzimidazole, polyarylate, acrylic, nylon, polyolefin, polyurethane, polypropylene, and polystyrene.

9 . The device according to claim 1 , wherein
the gas flow path is controlled to be under a positive pressure relative to the anode solution flow path, and a pressure difference between the gas flow path and the anode solution flow path is 5 kPa or more and 800 kPa or less.

10 . The device according to claim 1 , wherein
the cathode has an electrode substrate, a metal catalyst supported on a carbon material, and an ion-conductive material.

11 . The device according to claim 10 , wherein
the metal catalyst contains at least one metal selected from the group consisting of gold, silver, copper, platinum, palladium, nickel, cobalt, iron, manganese, titanium, cadmium, zinc, indium, gallium, lead, and tin, or a metal oxide thereof, and the metal catalyst has at least one structure selected from the group consisting of a nanoparticle, a nanostructure, and a nanowire.

12 . The device according to claim 1 , further comprising
a power supply configured to supply an electric current between the anode and the cathode.

13 . The device according to claim 1 , wherein
a thickness of the diaphragm is 20 μm or more and 300 μm or less.

Assignees

• Toshiba Kk

Inventors

• Kofuji Yusuke
• Ono Akihiko
• Kitagawa Ryota
• Mikoshiba Satoshi

Classifications

• C25B1/23 Primary

  Carbon monoxide or syngas · CPC title

• C25B9/23

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

• C25B9/19

  with diaphragms · CPC title

• C25B3/26

  of carbon dioxide · CPC title

• C25B11/065

  Carbon · CPC title