CO2 reduction catalyst, CO2 reduction electrode, CO2 reduction reaction apparatus, and process for producing CO2 reduction catalyst

Patent metadata

Field	Value
Publication number	US-10344388-B2
Application number	US-201615262362-A
Country	US
Kind code	B2
Filing date	Sep 12, 2016
Priority date	Sep 16, 2015
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

According to one embodiment of a CO2 reduction catalyst of the present invention, a conductive material is immersed in an aqueous solution containing a gold source, and a current or a potential is applied, whereby a highly active CO2 reduction catalyst can be formed in a wide range portion on a surface of the conductive material. According to one embodiment of a CO2 reduction catalyst of the present invention, in a CO2 reduction reaction apparatus including a CO2 reduction electrode having the CO2 reduction catalyst, CO2 is reduced.

First claim

What is claimed is:

1. A CO 2 reduction catalyst precipitated and formed by electrodeposition, wherein said CO 2 reduction catalyst is equipped with a porous metal layer, the porous metal layer including an aggregate, wherein the aggregate is formed by aggregating fine particles having a primary particle diameter of not less than 10 nm and not more than 200 nm and has a secondary particle diameter of not less than 200 nm and not more than 10 μm, or the porous metal layer including a site where fine particles having a particle diameter of not less than 10 nm and not more than 200 nm are deposited to a height of not less than 30 nm, or the porous metal layer including both the aggregate and the site, and the porous metal layer has a site, which electrically reduces CO 2 , at least a portion of a surface thereof.

2. The CO 2 reduction catalyst according to claim 1 , further comprising a thiol derivative.

3. The CO 2 reduction catalyst according to claim 1 , wherein in the porous metal layer, a ratio ({111}/{100}) between a maximum value of peak strength deriving from a {111} plane and a maximum value of peak strength deriving from a {100} plane in X-ray diffraction measurement is not less than 2.0.

4. The CO 2 reduction catalyst according to claim 1 , further comprising a surfactant.

5. A CO 2 reduction electrode comprising a conductive material and the CO 2 reduction catalyst according to claim 1 having conductivity with the conductive material.

6. The CO 2 reduction electrode according to claim 5 , comprising a porous structure or a through hole.

7. A CO 2 reduction reaction apparatus comprising:
an oxidation electrode which oxidizes water;
the CO 2 reduction electrode according to claim 5 ;
a power supply element which have electric conductivity with the oxidation electrode and the CO 2 reduction electrode; and
an electrolytic solution in contact with the oxidation electrode and the CO 2 reduction electrode.

8. A process for producing the CO 2 reduction catalyst according to claim 1 , comprising:
immersing a conductive material in an aqueous solution containing a metal source and a surfactant; and
applying a constant reduction current to precipitate the CO 2 reduction catalyst on the conductive material.

9. A process for producing the CO 2 reduction catalyst according to claim 1 , comprising:
immersing a conductive material in an aqueous solution containing a metal source and an electrolyte; and
precipitating the CO 2 reduction catalyst on the conductive material.

Assignees

• Toshiba Kk

Inventors

• Sugano Yoshitsune
• Kitagawa Ryota
• Ono Akihiko
• Tamura Jun
• Kudo Yuki
• Yamagiwa Masakazu
• Tsutsumi Eishi
• Mikoshiba Satoshi
• MOTOSHIGE Asahi
• Yamada Arisa

Classifications

• C25D5/54

  Electroplating of non-metallic surfaces (C25D7/12 takes precedence) · CPC title

• C25B11/035

  Chemistry & Metallurgy · mapped topic

• C25B1/04

  by electrolysis of water · CPC title

• C25B11/0473 Primary

  Chemistry & Metallurgy · mapped topic

• C25D7/0607

  Wires · CPC title