Fuel cell catalyst regeneration
View Patent ↗Systems and methods that facilitate operating proton exchange membrane (PEM) fuel cells are provided. The methods can involve contacting a reducing agent comprising a mixture of hydrogen and nitrogen, or a reducing plasma with a cathode catalyst of a proton exchange membrane fuel cell to reduce the cathode catalyst. The systems employ a fuel supply component that supplies fuel to the proton exchange membrane fuel cell; and a regeneration component that provides a reducing agent comprising a mixture of hydrogen and nitrogen, or a reducing plasma to a cathode catalyst of the proton exchange membrane fuel cell to reduce the cathode catalyst.
1. A method of regenerating a proton exchange membrane fuel cell, comprising:
contacting a reducing agent comprising a mixture of hydrogen and nitrogen, or a reducing plasma with a cathode catalyst of the proton exchange membrane fuel cell to reduce the cathode catalyst, the mixture comprising about 5 wt. % of hydrogen or more and about 95 wt. % of hydrogen or less and about 5 wt. % of nitrogen or more and about 95 wt. % of nitrogen or less, and the reducing plasma comprising at least one reducing gas species selected from a group consisting of a hydrogen containing plasma, a helium containing plasma, a neon containing plasma, an argon containing plasma, a nitrogen containing plasma, ammonia, amines, imines, and C1-C4 hydrocarbons, wherein the reducing agent is contacted with the cathode catalyst at a temperature of about −30 degrees Celsius or more and about 80 degrees Celsius or less and for about 1 second or more and about 1 hour or less.
2. The method of claim 1 , wherein the mixture of hydrogen and nitrogen comprises about 30 wt. % of hydrogen or more and about 70 wt. % of hydrogen or less and about 30 wt. % of nitrogen or more and about 70 wt. % of nitrogen or less.
3. The method of claim 1 , wherein the reducing plasma comprises an argon containing plasma.
4. The method of claim 1 , wherein the reducing agent is contacted with the cathode catalyst in an environment comprising less than about 50 volume ppm water and/or hydrocarbon.
5. The method of claim 1 , wherein the reducing agent is contacted with the cathode catalyst at a temperature of about −10 degrees Celsius or more and about 70 degrees Celsius or less and for about 5 seconds or more and about 30 minutes or less.
6. The method of claim 1 , wherein the reducing agent comprising the reducing plasma further comprises hydrogen.
7. A method of regenerating a proton exchange membrane fuel cell, comprising:
providing a reducing plasma to a cathode catalyst of the proton exchange membrane fuel cell, the reducing plasma comprising an argon containing plasma; and
contacting the reducing plasma with the cathode catalyst to reduce the cathode catalyst.
8. The method of claim 7 , wherein the reducing plasma comprises less than about 50 volume ppm water and/or hydrocarbon.
9. The method of claim 7 , wherein the reducing plasma is contacted with the cathode catalyst in an environment comprising less than about 50 volume ppm water and/or hydrocarbon.
10. The method of claim 7 , wherein the reducing plasma further comprises an inert gas species.
11. The method of claim 7 , wherein the reducing plasma is contacted with the cathode catalyst at a temperature of about −30 degrees Celsius or more and about 80 degrees Celsius or less and for about 1 second or more and about 1 hour or less.
12. The method of claim 7 , wherein the reducing plasma further comprises hydrogen.
13. A method of regenerating a proton exchange membrane fuel cell, comprising:
contacting a reducing agent comprising a mixture of hydrogen and nitrogen, or a reducing plasma with a cathode catalyst of the proton exchange membrane fuel cell to reduce the cathode catalyst, the mixture comprising about 5 wt. % of hydrogen or more and about 95 wt. % of hydrogen or less and about 5 wt. % of nitrogen or more and about 95 wt. % of nitrogen or less, and the reducing plasma comprising at least one reducing gas species selected from a group consisting of a hydrogen containing plasma, a helium containing plasma, a neon containing plasma, an argon containing plasma, a nitrogen containing plasma, ammonia, amines, imines, and C1-C4 hydrocarbons, wherein the reducing agent comprises less than about 50 volume ppm water and/or hydrocarbon, and the reducing agent is contacted with the cathode catalyst at a temperature of about −30 degrees Celsius or more and about 80 degrees Celsius or less and for about 1 second or more and about 1 hour or less.
14. The method of claim 13 , wherein the mixture of hydrogen and nitrogen comprises about 30 wt. % of hydrogen or more and about 70 wt. % of hydrogen or less and about 30 wt. % of nitrogen or more and about 70 wt. % of nitrogen or less.
15. The method of claim 13 , wherein the reducing plasma comprises an argon containing plasma.
16. The method of claim 13 , wherein the reducing agent is contacted with the cathode catalyst in an environment comprising less than about 50 volume ppm water and/or hydrocarbon.
17. The method of claim 13 , wherein the reducing agent is contacted with the cathode catalyst at a temperature of about −30 degrees Celsius or more and about 80 degrees Celsius or less and for about 1 second or more and about 1 hour or less.
18. The method of claim 13 , wherein the reducing agent comprising the reducing plasma further comprises hydrogen.
19. The method of claim 13 , wherein the reducing agent is contacted with the cathode catalyst at a temperature of about −10 degrees Celsius or more and about 70 degrees Celsius or less and for about 5 seconds or more and about 30 minutes or less.
20. The method of claim 13 , wherein the reducing plasma comprises a nitrogen containing plasma.