Anode for electrolytic processes

• US 3,950,240 A
• Filed: 05/05/1975
• Issued: 04/13/1976
• Est. Priority Date: 05/05/1975
• Status: Expired due to Term

• Current Assignee: Oxytech Systems, Inc.
• Original Assignee: Hooker Chemicals & Plastics Corp.
• Inventors: Stephens, Donald E., Bommaraju, Tilak V., Cookfair, Arthur S.
• Primary Examiner(s): Edmundson, F. C.
• Application Number:
  US05/574,477
• Time in Patent Office: 344 Days
• Field of Search: 204/290 F
• US Class Current: 204/290.08
• CPC Class Codes: C25B 11/093 at least one noble metal or noble metal oxide and at least one non-noble metal oxide

Abstract

An electrode useful as an anode for the electrolysis of aqueous solutions of ionizable chemical compounds, and especially the electrolysis of brines comprises an electroconductive substrate, such as a valve metal having a coating thereon of electroconductive tin oxide containing about 0.1 to about 15 mole percent of niobium based on the moles of tin. An additional electrocatalytic phase may be present as a minor component of the tin oxide coating and/or as a coating thereon.

Claims

1. An electrode comprising an electroconductive substrate and a coating thereon of tin oxide containing as a doping agent niobium in the amount of about 0.1 to about 15 mole percent based on the moles of tin and having an electrocatalytic material present at the outer surface of said coating.

2. An electrode according to claim 1 wherein the substrate is a valve metal.

3. An electrode according to claim 2 wherein the substrate is titanium.

4. An electrode according to claim 3 containing as a component of said coating up to about 20 mole percent of a noble metal oxide, based on the moles of tin.

5. An electrode according to claim 4 wherein said noble metal oxide is ruthenium oxide.

6. An electrode according to claim 5 wherein the ruthenium oxide is present in said coating in an amount of about 0.1 to about 10 mole percent, based on the moles of tin.

7. An electrode according to claim 1 comprising an electroconductive substrate, a coating thereon of tin oxide containing about 0.1 to about 15 mole percent of niobium, based on the moles of tin, and an outer coating of a noble metal or noble metal oxide.

8. An electrode according to claim 7 wherein the outer coating is a noble metal oxide.

9. An electrode according to claim 8 wherein the outer coating is ruthenium oxide.

10. An electrode according to claim 9 wherein the substrate is a valve metal.

11. An electrode according to claim 10 wherein the substrate is titanium.

12. An electrode according to claim 1 comprising an electroconductive substrate, a coating thereon of tin oxide containing about 0.1 to about 15 mole percent of niobium and up to about 20 mole percent of a noble metal oxide, based on moles of tin, and an outer coating of a noble metal or noble metal oxide.

13. An electrode according to claim 12 wherein said outer coating is a noble metal oxide.

14. An electrode according to claim 13 wherein said outer coating is ruthenium oxide.

15. An electrode according to claim 14 wherein said coating of tin oxide contains about 0.1 to about 10 mole percent of ruthenium oxide based on moles of tin.

16. An electrode according to claim 15 wherein said substrate is a valve metal.

17. An electrode according to claim 16 wherein said substrate is titanium.