Method of treating carbon electrode

Patent metadata

Field	Value
Publication number	US-10505199-B2
Application number	US-201515564278-A
Country	US
Kind code	B2
Filing date	Apr 9, 2015
Priority date	Apr 9, 2015
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

A method of treating a carbon electrode includes heat treating a carbon-based electrode in an environment that is above approximately 325° C. and that includes an oxidizing gas, and prior to use of the carbon-based electrode in an electro-chemical battery device, soaking the carbon-based electrode in an oxidizer solution.

First claim

What is claimed is:

1. A method of treating a carbon electrode, the method comprising:
(a) heat treating a carbon-based electrode in an environment that is above approximately 325° C. and that includes an oxidizing gas; and
(b) prior to use of the carbon-based electrode in an electro-chemical battery device, soaking the carbon-based electrode from said step (a) in an oxidizer solution, and applying a voltage potential to the carb-based electrode during step (b), wherein the voltage potential is selected such that it does not cause evolution of oxygen from the oxidizer solution.

2. The method as recited in claim 1 , wherein the oxidizer solution comprises an oxidizer selected from the group consisting of peroxide, oxyacid, peroxysulfate, permanganate, dioxovanadium sulfate (V(V) aq ), and combinations thereof.

3. The method as recited in claim 1 , wherein the oxidizer solution comprises peroxide.

4. The method as recited in claim 1 , wherein the oxidizer solution comprises oxyacid.

5. The method as recited in claim 1 , wherein the oxidizer solution comprises peroxysulfate.

6. The method as recited in claim 1 , wherein the oxidizer solution comprises permanganate.

7. The method as recited in claim 1 , wherein the oxidizer solution comprises ozone.

8. The method as recited in claim 1 , wherein the oxidizer solution comprises vanadium oxide (V).

9. The method as recited in claim 1 , wherein the temperature is approximately 400° C. to approximately 450° C.

10. The method as recited in claim 1 , wherein the voltage potential is approximately 1.4 to approximately 2.0 volts versus a standard hydrogen reference electrode.

11. The method as recited in claim 1 , wherein the carbon-based electrode initially in said step (a) is substantially free of oxides.

12. The method as recited in claim 11 , wherein the heat treating causes oxide groups to form on a surface of the carbon-based electrode.

13. The method as recited in claim 12 , wherein the soaking causes oxide groups to form on the surface of the carbon-based electrode.

14. The method as recited in claim 12 , wherein the soaking increases the oxidation step of the oxide groups formed by the heat treating.

15. The method as recited in claim 1 , wherein the oxidizing gas comprises at least approximately 15 vol % oxygen.

16. The method as recited in claim 1 , further comprising rinsing the carbon-based electrode after the soaking step to remove residual oxidizer solution from the carbon-based electrode.

17. A method of treating a carbon electrode, the method comprising:
(a) heat treating a carbon-based electrode in an air environment that is approximately 400° C. to approximately 450° C.;
(b) prior to use of the carbon-based electrode in an electro-chemical battery device, soaking the carbon-based electrode from said step (a) in an oxidizer solution including an oxidizer selected from the group consisting of peroxide, oxyacid, peroxysulfate, permanganate, ozone, vanadium oxide (V), and combinations thereof; and
(c) during the soaking, applying a voltage potential to the carbon-based electrode, wherein the voltage potential is selected such that it does not cause evolution of oxygen from the oxidizer solution.

18. The method as recited in claim 17 , wherein the voltage potential is approximately 1.4 to approximately 2.0 volts versus a standard hydrogen reference electrode.

19. The method as recited in claim 17 , wherein the oxidizer solution comprises peroxide.

20. The method as recited in claim 17 , wherein the oxidizer solution comprises oxyacid.

21. The method as recited in claim 17 , wherein the oxidizer solution comprises peroxysulfate.

22. The method as recited in claim 17 , wherein the oxidizer solution comprises permanganate.

23. The method as recited in claim 17 , wherein the oxidizer solution comprises ozone.

24. The method as recited in claim 17 , wherein the oxidizer solution comprises vanadium oxide (V).

Assignees

• United Technologies Corp

Inventors

• Darling Robert Mason

Classifications

• H01M4/88

  Processes of manufacture · CPC title

• H01M4/96

  Carbon-based electrodes · CPC title

• H01M8/188 Primary

  by recharging of redox couples containing fluids; Redox flow type batteries · CPC title

• H01M4/8882 Primary

  Heat treatment, e.g. drying, baking · CPC title

• H01M4/8878

  Treatment steps after deposition of the catalytic active composition or after shaping of the electrode being free-standing body · CPC title