Electrode for electrolysis, electrolytic cell and production method for electrode for electrolysis

Patent metadata

Field	Value
Publication number	US-10513787-B2
Application number	US-201113993860-A
Country	US
Kind code	B2
Filing date	Dec 14, 2011
Priority date	Dec 15, 2010
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

An electrode for electrolysis includes a conductive substrate, a first layer formed on the conductive substrate, and a second layer formed on the first layer. The first layer contains at least one oxide selected from the group consisting of ruthenium oxide, iridium oxide, and titanium oxide. The second layer contains an alloy of platinum and palladium. The electrode for electrolysis shows low overvoltage and has excellent durability over a long period.

First claim

The invention claimed is:

1. An electrode for electrolysis comprising:
a conductive substrate;
a first layer formed on the conductive substrate; and
a second layer formed on the first layer,
wherein the first layer contains at least one oxide selected from the group consisting of ruthenium oxide, iridium oxide, and titanium oxide, and
the second layer contains
an alloy of platinum and palladium, and
palladium oxide,
wherein a mole percentage of palladium atoms forming an oxide is 13% or less of the total amount of platinum and palladium atoms in the second layer; and
wherein in the second layer, the mole percentage of palladium atoms forming an oxide to the total amount of palladium atoms is 20% or less;
wherein a half width of a diffraction peak of the alloy of which a diffraction angle is 46.29° to 46.71° in a powder X-ray diffraction pattern is 0.5° or less, and
wherein a content of platinum element contained in the second layer is greater than 4 mol and less than 10 mol with respect to 1 mol of palladium element contained in the second layer.

2. The electrode for electrolysis according to claim 1 , wherein the first layer contains ruthenium oxide, iridium oxide, and titanium oxide.

3. The electrode for electrolysis according to claim 2 , wherein the content of iridium oxide contained in the first layer is ⅕ to 3 mol with respect to 1 mol of ruthenium oxide contained in the first layer, and
the content of titanium oxide contained in the first layer is ⅓ to 8 mol with respect to 1 mol of ruthenium oxide contained in the first layer.

4. An electrolytic cell comprising the electrode for electrolysis according to claim 1 .

5. An electrode for electrolysis comprising:
a conductive substrate;
a first layer formed on the conductive substrate; and
a second layer formed on the first layer,
wherein the first layer contains at least one oxide selected from the group consisting of ruthenium oxide, iridium oxide, and titanium oxide, and
the second layer contains
an alloy of platinum and palladium, and
palladium oxide,
wherein a mole percentage of palladium atoms forming an oxide is 13% or less of the total amount of platinum and palladium atoms in the second layer; and
wherein in the second layer, the mole percentage of palladium atoms forming an oxide to the total amount of palladium atoms is 5% to 20%;
wherein a half width of a diffraction peak of the alloy of which a diffraction angle is 46.29° to 46.71° in a powder X-ray diffraction pattern is 0.5° or less, and
wherein a content of platinum element contained in the second layer is greater than 4 mol and less than 10 mol with respect to 1 mol of palladium element contained in the second layer.

6. The electrode for electrolysis according to claim 5 , wherein the first layer contains ruthenium oxide, iridium oxide, and titanium oxide.

7. The electrode for electrolysis according to claim 6 , wherein the content of iridium oxide contained in the first layer is ⅕ to 3 mol with respect to 1 mol of ruthenium oxide contained in the first layer, and
the content of titanium oxide contained in the first layer is ⅓ to 8 mol with respect to 1 mol of ruthenium oxide contained in the first layer.

8. An electrolytic cell comprising the electrode for electrolysis according to claim 5 .

9. The electrode for electrolysis according to claim 1 , wherein the content of iridium oxide contained in the first layer is ⅕ to 3 mol with respect to 1 mol of ruthenium oxide contained in the first layer.

10. The electrode for electrolysis according to claim 1 , the content of titanium oxide contained in the first layer is ⅓ to 8 mol with respect to 1 mol of ruthenium oxide contained in the first layer.

11. The electrode for electrolysis according to claim 1 ,
wherein in the second layer, the mole percentage of palladium atoms forming an oxide to the total amount of palladium atoms is 5% or less.

12. The electrode for electrolysis according to claim 1 ,
wherein in the second layer, the mole percentage of palladium atoms forming an oxide to the total amount of palladium atoms is 20%.

13. The electrode for electrolysis according to claim 1 ,
wherein in the second layer, the mole percentage of palladium atoms forming an oxide to the total amount of palladium atoms is 15%.

14. The electrode for electrolysis according to claim 1 ,
wherein in the second layer, the mole percentage of palladium atoms forming an oxide to the total amount of palladium atoms is 5%.

Assignees

• Haneda Tsuyoshi
• Tsuchida Kazuyuki
• Hachiya Toshinori
• Asahi Chemical Ind

Inventors

• Haneda Tsuyoshi
• Tsuchida Kazuyuki
• Hachiya Toshinori

Classifications

• C25B1/26 Primary

  Chlorine; Compounds thereof (by simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine C25B1/34) · CPC title

• C25B11/0484

  Chemistry & Metallurgy · mapped topic

• C25B11/0405 Primary

  Chemistry & Metallurgy · mapped topic

• C25B11/0494

  Chemistry & Metallurgy · mapped topic

• C25B11/067

  Inorganic compound e.g. ITO, silica or titania · CPC title