Diamond electrode for electrolysis
View Patent ↗A diamond electrode having a prolonged life by combining a conventional diamond electrode having a relatively short life with other components is provided. A diamond electrode for electrolysis includes an electrode substrate, at least the surface of which comprises Magneli phase titanium oxide, and conductive diamond supported as an electrode catalyst on a surface of the electrode. The electrode catalyst may contain a titanium oxide powder. Magneli phase titanium oxide improves conductivity without forming a stable oxide layer on the substrate surface.
1. A diamond electrode for electrolysis comprising an electrode substrate, at least the surface of which comprises Magneli phase titanium oxide, and conductive diamond supported as an electrode catalyst on a surface of the electrode, wherein a volume ratio of the conductive diamond powder to the Magneli phase titanium oxide powder is from 1/20 to 20/1.
2. The diamond electrode for electrolysis as claimed in claim 1 , wherein the electrode substrate is a Magneli phase titanium oxide substrate.
3. A diamond electrode for electrolysis comprising an electrode substrate, at least the surface of which comprises Magneli phase titanium oxide, and a mixture of a conductive diamond powder and a Magneli phase titanium oxide powder, supported as an electrode catalyst on a surface of the electrode, wherein a volume ratio of the conductive diamond powder to the Magneli phase titanium oxide powder is from 1/20 to 20/1.
4. The diamond electrode for electrolysis as claimed in claim 3 , wherein the electrode substrate is a Magneli phase titanium oxide substrate.
5. A diamond electrode for electrolysis comprising an electrode catalyst including a mixture of conductive diamond powder and a Magneli phase titanium oxide powder arranged on a Magneli phase titanium oxide substrate, prepared by
(i) charging a container of a pressing device with a first slurry of a Magneli phase titanium oxide powder;
(ii) spreading a second slurry comprising a conductive diamond powder and a Magneli phase titanium oxide powder on the first slurry; and
(iii) molding under pressure and sintering.
6. The diamond electrode for electrolysis as claimed in claim 5 , wherein a volume ratio of the conductive diamond powder to the Magneli phase titanium oxide powder in the electrode catalyst is from 1/20 to 20/1.
7. The diamond electrode for electrolysis as claimed in claim 5 , wherein the electrode catalyst contains at least 5 vol % Magneli phase titanium oxide powder.
8. A diamond electrode for electrolysis comprising an electrode substrate, at least the surface of which comprises Magneli phase titanium oxide, and a mixture of a conductive diamond powder and a Magneli phase titanium oxide powder, supported as an electrode catalyst on a surface of the electrode substrate, prepared by:
(i) spreading a slurry comprising conductive diamond powder and Magneli phase titanium oxide powder onto a Magneli phase titanium oxide plate; and
(ii) molding under pressure followed by sintering to obtain a Magneli phase titanium oxide plate having a mixed powder catalyst layer supported thereon.
9. The diamond electrode for electrolysis as claimed in claim 8 , wherein a volume ratio of the conductive diamond powder to the Magneli phase titanium oxide powder in the electrode catalyst is from 1/20 to 20/1.
10. The diamond electrode for electrolysis as claimed in claim 8 , wherein the electrode catalyst contains Magneli phase titanium oxide powder in an amount of at least 5 vol %.
11. A diamond electrode for electrolysis comprising an electrode substrate, at least the surface of which comprises Magneli phase titanium oxide, and conductive diamond supported as an electrode catalyst on a surface of the electrode, prepared by:
(i) charging a first slurry of a Magneli phase titanium oxide powder into a container of a pressing device;
(ii) spreading a second slurry comprising a conductive diamond powder and a Magneli phase titanium oxide powder on the first slurry; and
(iii) molding under pressure and then sintering to obtain an electrode comprising conductive diamond sintered on a Magneli phase titanium oxide substrate.
12. The diamond electrode for electrolysis as claimed in claim 11 , wherein a volume ratio of the conductive diamond powder to the Magneli phase titanium oxide powder in the electrode catalyst is from 1/20 to 20/1.
13. The diamond electrode for electrolysis as claimed in claim 11 , wherein the electrode catalyst contains Magneli phase titanium oxide powder in an amount of at least 5 vol %.