Electrolysis device and refrigerator

Patent metadata

Field	Value
Publication number	US-9863047-B2
Application number	US-201414453895-A
Country	US
Kind code	B2
Filing date	Aug 7, 2014
Priority date	Mar 24, 2011
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

An electrolysis device of an embodiment includes:
an anode, a cathode having a nitrogen-containing carbon alloy catalyst, and an electrolysis cell having a membrane electrode assembly composed of an electrolyte present between the anode and the cathode so that voltage is applied to the anode and the cathode, wherein the electrolyte is any one of acidic, neutral, or alkali, water is produced by the electrolysis device at the cathode, when the electrolyte is acidic, and hydroxide ion is produced by the electrolysis device at the anode, when the electrolyte is neutral or alkali.

First claim

What is claimed is:

1. An operation method of an electrolysis device, the electrolysis device comprising an anode, a cathode having a nitrogen-containing carbon alloy catalyst, and an electrolysis cell having a membrane electrode assembly composed of an electrolyte present between the anode and the cathode, having a nitrogen-containing carbon alloy catalyst, the method comprising:
applying voltage to the anode and the cathode having a nitrogen-containing carbon alloy catalyst,
wherein:
the electrolyte is any one of acidic, neutral, or alkali;
a potential at the cathode having a nitrogen-containing carbon alloy catalyst is lower than a hydrogen generation potential at a cathode in which Pt is used as a catalyst;
the device is operated with a condition of that a hydrogen generation potential at the cathode having a nitrogen-containing carbon alloy catalyst, is −0.2 to −0.7 V vs. RHE when the electrolyte is acidic or that a hydrogen generation potential at the cathode having a nitrogen-containing carbon alloy catalyst, is −0.2 to −0.9 V vs. RHE when the electrolyte is neutral or alkali; and
the device is operated with a condition of that an oxygen reduction initiation potential at the cathode having a nitrogen-containing carbon alloy catalyst is 0.88 to 0.75 V vs. RHE when the electrolyte is acidic or that an oxygen reduction initiation potential at the cathode having a nitrogen-containing carbon alloy catalyst is 0.94 to 0.87 V vs. RHE when the electrolyte is neutral or alkali.

2. The method according to claim 1 , wherein the electrolyte of the membrane electrode assembly is an acidic membrane having cation exchange ability.

3. The method according to claim 1 , wherein the electrolyte of the membrane electrode assembly is a neutral or alkali membrane having anion exchange ability.

4. The method according to claim 1 , wherein the electrolysis cell is provided in a sealable vessel.

5. The method according to claim 1 , wherein, compared to amount of elements on surface, 0.1 atm % or more to 30 atm % or less of the carbon in the carbon alloy catalyst is substituted with nitrogen.

6. The method according to claim 1 , wherein, compared to amount of elements on surface, 0.1 atm % or more to 10 atm % or less of the carbon in the carbon alloy catalyst is substituted with nitrogen.

7. The method according to claim 1 , wherein a part of the carbons forming Sp2 hybrid orbital with each other in the carbon alloy catalyst is substituted with nitrogen.

8. The method according to claim 1 , wherein the carbon alloy catalyst has a pyridine type nitrogen substitution.

9. The method according to claim 1 , wherein the carbon alloy catalyst has a pyrrole·substitution, a pyridone substitution or a combination of two.

10. The method according to claim 1 , wherein the carbon alloy catalyst has an N oxide type nitrogen substitution.

11. The method according to claim 1 , wherein the carbon alloy catalyst has a pore and 60% or more of the pore has a diameter of 20 nm or more.

12. The method according to claim 1 , wherein the carbon alloy catalyst has a specific surface area of 100 m 2 /g to 1200 m 2 /g.

13. An operation method of a refrigerator device, the method comprising:
applying voltage to an anode and a cathode, having a nitrogen-containing carbon alloy catalyst,
wherein:
the refrigerator device comprises an electrolysis device comprising the anode, the cathode having a nitrogen-containing carbon alloy catalyst, and an electrolysis cell having a membrane electrode assembly composed of an electrolyte present between the anode and the cathode having a nitrogen-containing carbon alloy catalyst;
the electrolyte is any one of acidic, neutral, or alkali;
a potential at the cathode having a nitrogen-containing carbon alloy catalyst is lower than a hydrogen generation potential at a cathode in which Pt is used as a catalyst;
the electrolysis device is operated with a condition of that a hydrogen generation potential at the cathode is −0.2 to −0.7 V vs. RHE when the electrolyte is acidic or that a hydrogen generation potential at the cathode having a nitrogen-containing carbon alloy catalyst is −0.2 to −0.9 V vs. RHE when the electrolyte is neutral or alkali; and
the electrolysis device is operated with a condition of that an oxygen reduction initiation potential at the cathode having a nitrogen-containing carbon alloy catalyst is 0.88 to 0.75 V vs. RHE when the electrolyte is acidic or that an oxygen reduction initiation potential at the cathode having a nitrogen-containing carbon alloy catalyst is 0.94 to 0.87V vs. RHE when the electrolyte is neutral or alkali.

14. The method according to claim 13 , wherein the electrolyte of the membrane electrode assembly is an acidic membrane having cation exchange ability.

15. The method according to claim 13 , wherein the electrolyte of the membrane electrode assembly is a neutral or alkali membrane having anion exchange ability.

16. The method according to claim 13 , wherein the electrolysis cell is provided in a sealable vessel.

17. The method according to claim 13 , wherein, compared to amount of elements on surface, 0.1 atm % or more to 30 atm % or less of the carbon in the carbon alloy catalyst is substituted with nitrogen.

18. The method according to claim 13 , wherein, compared to amount of elements on surface, 0.1 atm % or more to 10 atm % or less of the carbon in the carbon alloy catalyst is substituted with nitrogen.

19. The method according to claim 13 , wherein a part of the carbons forming Sp2 hybrid orbital with each other in the carbon alloy catalyst is substituted with nitrogen.

20. The method according to claim 13 , wherein the carbon alloy catalyst has a pyridine type nitrogen substitution.

21. The method according to claim 13 , wherein the carbon alloy catalyst has a pyrrole·substitution, a pyridone substitution or a combination of the two.

22. The method according to claim 13 , wherein the carbon alloy catalyst has an N oxide type nitrogen substitution.

23. The method according to claim 13 , wherein the carbon alloy catalyst has a pore and 60% or more of the pore has a diameter of 20 nm or more.

24. The method according to claim 13 , wherein the carbon alloy catalyst has a specific surface area of 100 m 2 /g to 1200 m 2 /g.

Assignees

• Toshiba Kk
• Toshiba Lifestyle Products & Services Corp

Inventors

• Yoshinaga Norihiro
• Nakano Yoshihiko
• Tomimatsu Norihiro
• Akasaka Yoshihiro

Classifications

• C25B9/15

  Flow-through cells · CPC title

• C25B9/23

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

• F25D2317/0411

  by dehumidification · CPC title

• F25D17/042

  Air treating means within refrigerated spaces (air conditioning in general F24F) · CPC title

• C25B9/10

  Chemistry & Metallurgy · mapped topic