Cathode for electrolysis and method for producing same, and electrolytic cell for electrolysis

Patent metadata

Field	Value
Publication number	US-10626512-B2
Application number	US-201515538249-A
Country	US
Kind code	B2
Filing date	Dec 22, 2015
Priority date	Dec 26, 2014
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

Provided is a cathode for electrolysis comprising a conductive substrate and a Ru element-containing catalyst layer on the conductive substrate, wherein in the catalyst layer, the ratio of the maximum intensity of the Ru 3d 5/2 peak appearing between 281.4 eV and 282.4 eV to the maximum intensity of the Ru 3d 5/2 peak appearing between 280.0 eV and 281.0 eV, in an X-ray photoelectron spectroscopic measurement is 0.45 or more.

First claim

The invention claimed is:

1. A cathode for electrolysis comprising a conductive substrate and a Ru element-containing catalyst layer on the conductive substrate, wherein the catalyst layer comprises, as a second component, at least one or more elements selected from Nd, Pm, Sm, Eu, Gd, Tb and Dy and, as a third component, at least one or more elements selected from Mn, Fe, Co, Zn, Ga, S and Pb, wherein in the catalyst layer, the ratio of the maximum intensity of the Ru 3d 5/2 peak appearing between 281.4 eV and 282.4 eV to the maximum intensity of the Ru 3d 5/2 peak appearing between 280.0 eV and 281.0 eV, in an X-ray photoelectron spectroscopic measurement is 0.45 or more.

2. The cathode for electrolysis according to claim 1 , wherein in the catalyst layer, the ratio of the peak intensity of Ru oxide of the Miller index (101) plane observed in the angle domain of 2θ=35°to the peak intensity of Ru oxide of the Miller index (110) plane observed in the angle domain of 2θ=28°in an X-ray diffraction measurement is 1.5 or less.

3. The cathode for electrolysis according to claim 1 , wherein the conductive substrate comprises Ni.

4. The cathode for electrolysis according to claim 1 , wherein the amount of the element(s) of the second component is 0.01 mol or more and less than 1 mol in relation to 1 mol of the Ru element.

5. The cathode for electrolysis according to claim 1 , wherein the amount of the element(s) of the third component is 0.01 mol or more and less than 1 mol in relation to 1 mol of the Ru element.

6. The cathode for electrolysis according to any one claim 1 , wherein in the catalyst layer, at least either of the second component and the third component is present as an oxide or a hydroxide.

7. The cathode for electrolysis according to claim 1 , wherein the Ru element in the catalyst layer is ruthenium oxide or ruthenium hydroxide.

8. The cathode for electrolysis according to claim 1 , wherein the supported amount of the Ru element is 1 to 20 g/m 2 .

9. An electrolytic cell for water or an aqueous alkali metal chloride solution, comprising the cathode for electrolysis according to claim 1 .

10. A method for producing a cathode for electrolysis, wherein a catalyst layer is formed on a conductive substrate through:
an application step of applying, onto the conductive substrate, an application liquid comprising as a first component the Ru element, as a second component at least one or more elements selected from Nd, Pm, Sm, Eu, Gd, Tb and Dy, and as a third component at least one or more elements selected from Mn, Fe, Co, Zn, Ga, S and Pb;
a film formation step of forming a coating film by drying the application liquid; and
a thermal decomposition step of heating and thermally decomposing the coating film;
wherein in the catalyst layer, the ratio of the maximum intensity of the Ru 3d 5/2 peak appearing between 281.4 eV and 282.4 eV to the maximum intensity of the Ru 3d 5/2 peak appearing between 280.0 eV and 281.0 eV, in an X-ray photoelectron spectroscopic measurement is 0.45 or more.

11. The method for producing a cathode for electrolysis according to claim 10 ,
wherein the first component in the application liquid is at least one selected from a nitric acid salt, a dinitrodiammine complex, a nitrosyl nitrate, a chloride salt and an acetic acid salt;
the second component is at least one selected from a nitric acid salt, a chloride salt and an acetic acid salt; and
the third component is at least one selected from a nitric acid salt, a chloride salt and an acetic acid salt.

12. The method for producing a cathode for electrolysis according to claim 10 , wherein the application step, the film formation step and the thermal decomposition step are repeated two or more times.

13. The method for producing a cathode for electrolysis according to claim 10 , wherein the thermal decomposition step is performed at a temperature of 350°C. or higher and lower than 600°C.

14. The method for producing a cathode for electrolysis according to claim 10 , wherein before the thermal decomposition step, a preliminary calcination is performed at a temperature of 100°C. or higher and lower than 350°C. for 1 minute to 60 minutes.

15. The method for producing a cathode for electrolysis according to claim 10 , wherein in the film formation step, the drying of the application liquid is performed at a temperature of 100°C. or lower.

16. The cathode for electrolysis according to claim 5 , wherein in the catalyst layer, at least either of the second component and the third component is present as an oxide or a hydroxide.

Assignees

• Asahi Chemical Ind

Inventors

• Funakawa Akiyasu
• Hata Takayuki
• Hachiya Toshinori

Classifications

• B01J23/462

  Ruthenium · CPC title

• C01G55/004

  Oxides; Hydroxides · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• C25B11/0405

  Chemistry & Metallurgy · mapped topic

• C25B1/06

  Chemistry & Metallurgy · mapped topic