Granted Patent B2

US 12,404,592 · App. 16/401,717 · Granted Sep 2, 2025

Inventors: Umit Ozkan (Columbus, OH); Kuldeep Mamtani (Columbus, OH); Deeksha Jain (Columbus, OH)

Assignee: Ohio State Innovation Foundation

C25B1/26C25B1/24C25B11/02C25B11/044B82Y30/00

Abstract

Claims (21)

1. A method for electrochemically producing a halogen, comprising:

contacting a halide ion in acidic or alkaline electrolyte media with a heteroatom-doped carbon catalyst in an electrochemical cell, wherein the halide ion is present in the acidic or alkaline electrolyte media at a concentration of from 10 mM to less than 500 mM, and applying a current or potential to the electrochemical cell to produce the halogen,

wherein the heteroatom-doped carbon catalyst comprises a heteroatom selected from nitrogen, phosphorous, boron, sulfur, chlorine, a transition metal, or a combination thereof; and

wherein the heteroatom-doped carbon catalyst is present as a nanostructure selected from the group consisting of a herringbone structure, a stacked platelet, a stacked cup, a graphene sheet, or a combination thereof.

2. The method of claim 1 , wherein the heteroatom includes phosphorous, iron, cobalt, chlorine, sulfur, boron, or a combination thereof.

3. The method of claim 1 , wherein the heteroatom-doped carbon catalyst is represented by the chemical formula CN x P y , where x is from 0 to about 10 wt % and y is from 0 to about 10 wt %, wherein at least one of x and y is greater than 0 wt %.

4. The method of claim 3 , wherein y is in the range of from about 1 ppm to about 6 wt %.

5. The method of claim 3 , wherein x is in the range of from about 1 ppm to about 10 wt %.

6. The method of claim 1 , wherein the electrochemical cell comprises a pair of electrodes comprising an anode and a cathode;

wherein at least one of the anode and the cathode comprise the heteroatom-doped carbon catalyst.

7. The method of claim 6 , wherein the anode and the cathode comprise the heteroatom-doped carbon catalyst.

8. The method of claim 7 , wherein the anode and the cathode are free of other catalysts.

9. The method of claim 6 , wherein the electrode does not contain a precious metal.

10. The method of claim 1 , wherein the nanostructure is selected from the group consisting of a herringbone structure, a stacked platelet, a stacked cup, or a combination thereof.

11. The method of claim 1 , wherein the heteroatom-doped carbon catalyst includes at least a trace amount of a transition metal to not more than 3 wt % of the transition metal.

12. The method of claim 1 , wherein the halogen produced is chlorine, bromine, or a mixture thereof.

13. The method of claim 12 , wherein the halogen produced comprises bromine.

14. The method of claim 1 , wherein the heteroatom-doped carbon catalyst does not comprise phosphorous.

15. The method of claim 1 , wherein the heteroatom-doped carbon catalyst comprises nitrogen.

16. The method of claim 1 , wherein the halide ion is present in the acidic or alkaline electrolyte media at a concentration of from 10 mM to 300 mM.

17. The method of claim 1 , wherein the electrochemical cell further comprises an oxygen depolarized cathode.

Assignments (2)

Continuity (2)

References Cited (57)