Method of enhancing electrodes
View Patent ↗One embodiment includes a method of forming a hydrophilic particle containing electrode including providing a catalyst; providing hydrophilic particles suspended in a liquid to form a liquid suspension; contacting said catalyst with said liquid suspension; and, drying said liquid suspension contacting said catalyst to leave said hydrophilic particles attached to said catalyst.
1. A method comprising:
providing a catalyst;
providing hydrophilic particles suspended in a liquid to form a liquid suspension;
contacting said catalyst with said liquid suspension; and,
thereafter drying said liquid suspension contacting said catalyst to leave said hydrophilic particles attached to said catalyst wherein said hydrophilic particles comprise hydroxyls bonded to a surface of each of said hydrophilic particles with the proviso that the hydrophilic particles do not include ruthenium.
2. A method as set forth in claim 1 wherein the catalyst comprises a thin film catalyst.
3. A method as set forth in claim 1 , wherein said thin film catalyst comprises a plurality of whisker shaped particles wherein at least a shell of said whisker shaped particles comprises said thin film catalyst.
4. A method as set forth in claim 1 , wherein said whiskers comprise a diameter of about 10 to about 250 nm and a length of about 100 nm to about 1 micron.
5. A method as set forth in claim 1 , wherein said thin film catalyst is attached to a proton exchange membrane.
6. A method as set forth in claim 5 wherein said proton exchange membrane comprises an electrode wherein said electrode comprises a fuel cell a proton exchange membrane (PEM) electrode.
7. A method as set forth in claim 6 , wherein said electrode comprises a proton exchange membrane (PEM) electrode comprising a vehicle fuel cell.
8. A method as set forth in claim 6 wherein said polymer exchange membrane (PEM) electrode has a thickness of less than 1 micron and wherein said proton exchange membrane (PEM) electrode has a membrane electrode area (MEA), and wherein the hydrophilic particles comprise silicon dioxide and wherein the hydrophilic particle loading on the thin film catalyst is from about 1 micrograms/cm 2 MEA to about 30 micrograms/cm 2 MEA .
9. A method as set forth in claim 2 , wherein said step of drying comprises hot pressing said thin film catalyst.
10. A method as set forth in claim 2 , further comprising the step of hot pressing said thin film catalyst onto a substrate.
11. A method as set forth in claim 2 , wherein said thin film catalyst comprises a noble metal.
12. A method as set forth in claim 11 , wherein said catalyst comprises Pt.
13. A method as set forth in claim 1 , wherein said substrate comprises a proton exchange membrane (PEM).
14. A method as set forth in claim 13 further comprising:
forming a fuel cell using the proton exchange membrane and the thin film catalyst and operating the fuel cell at less than 80% relative humidity.
15. A method as set forth in claim 1 , wherein said step of contacting comprises at least one of spraying, rod coating or slot coating.
16. A method as set forth in claim 1 , wherein said hydrophilic particles comprise an oxide.
17. A method as set forth in claim 1 , wherein said hydrophilic particles comprise silicon dioxide.
18. A method as set forth in claim 1 , wherein said hydrophilic particles have a primary particle size of from about 1 nm to about 50 nm.
19. A method as set forth in claim 1 , wherein said catalyst comprises a thin film catalyst comprising an exterior shell of particles having a dimension larger than said hydrophilic particles.
20. A method comprising:
providing a thin film catalyst;
providing hydrophilic particles suspended in a liquid to form a liquid suspension;
contacting said catalyst with said liquid suspension; and,
thereafter drying said liquid suspension contacting said catalyst to leave said hydrophilic particles attached to said catalyst wherein the hydrophilic particles are coated onto the catalyst by contacting a rod covered with the suspension to the catalyst surface and wherein said hydrophilic particles have surface areas of about 20 M 2 /g to about 250 M 2 /g and wherein said hydrophilic particles comprise hydroxyls bonded to a surface of each of said hydrophilic particles with the proviso that the hydrophilic particles do not include ruthenium.
21. A method comprising:
providing a thin film catalyst;
providing hydrophilic particles suspended in a liquid to form a liquid suspension;
contacting said catalyst with said liquid suspension; and,
thereafter drying said liquid suspension contacting said catalyst to leave said hydrophilic particles attached to said catalyst wherein the hydrophilic particles are coated onto the thin film catalyst by forcing the liquid suspension through a slot positioned above and moved over the thin film catalyst surface and wherein said hydroplilic particles are formed by flame pyrolysis wherein said hydrophilic particles comprise hydroxyls bonded to a surface of each of said hydrophilic particles with the proviso that the hydrophilic particles do not include ruthenium.
22. A method comprising:
providing a catalyst;
providing hydrophilic particles suspended in a liquid to form a liquid suspension;
contacting said catalyst with said liquid suspension; and,
thereafter drying said liquid suspension contacting said catalyst to leave said hydrophilic particles attached to said catalyst wherein said hydrophilic particles comprise hydroxyls bonded to a surface of each of said hydrophilic particles and wherein said hydrophilic particles consist of silicon dioxide.