Conductive, anti-corrosive material

Patent metadata

Field	Value
Publication number	US-11404703-B2
Application number	US-201916452866-A
Country	US
Kind code	B2
Filing date	Jun 26, 2019
Priority date	Jun 26, 2019
Publication date	Aug 2, 2022
Grant date	Aug 2, 2022

Abstract

A proton-exchange-membrane fuel cell bipolar plate includes a metal substrate having a bulk portion and a surface portion including an anticorrosive, conductive binary phosphide material having a formula (I):AxPy  (I),where A is an alkali metal, alkaline earth metal, transition metal, post-transition metal, or metalloid, x, y is each a number independently selected from 1 to 15, and the binary phosphide material is configured to impart anticorrosive and conductive properties to the metal substrate.

First claim

What is claimed is:

1. A proton-exchange-membrane fuel cell bipolar plate comprising:
a metal substrate having a bulk portion and a surface portion comprising an anticorrosive, conductive binary phosphide material having a formula (I):
A x P y   (I),

where A is V, Cr, Ni, Zr, Nb, Mo, or Sn; and x and y are each a number independently selected from 1 to 15, and the binary phosphide material being configured to impart anticorrosive and conductive properties to the metal substrate.

2. The bipolar plate of claim 1 , wherein the corrosion resistance of the bipolar plate is less than 10 μA cm −2 at about 80° C., at pH of 2-3, with the presence of 0.1 ppm of HF in the solution.

3. The substrate of claim 1 , wherein A is Ni and A x P y is NiP 2 , Ni 3 P, NiP 3 , Ni 5 P 4 , Ni 12 P 5 , or a combination thereof.

4. The substrate of claim 1 , wherein A is Zr and A x P y is ZrP 2 , Zr 7 P 4 , or a combination thereof.

5. The substrate of claim 1 , wherein electrical conductivity of the material is greater than 100 S cm −1 .

6. The substrate of claim 1 , wherein the surface portion comprises at least 50 wt. % of the binary phosphide.

7. The substrate of claim 1 , wherein the bulk portion is steel, graphite, aluminum, titanium, copper, or a combination thereof.

8. The substrate of claim 1 , wherein the surface portion further comprises a dopant including at least one of N, C, or F.

9. The substrate of claim 1 , wherein A is Mo and A x P y is MoP 2 , Mo 3 P, MoP 4 , or a combination thereof.

10. The substrate of claim 1 , wherein A is Sn and A x P y is Sn 4 P 3 , SnP, or a combination thereof.

11. The substrate of claim 1 , wherein A is Nb and A x P y is Nb 7 P 4 .

12. A proton-exchange-membrane fuel cell bipolar plate comprising:
a metal substrate having a bulk portion and a surface portion including an anticorrosive, conductive ternary phosphide material having a formula (II):
A x B z P y   (II),

where A and B are each V, Cr, Ni, Zr, Nb, Mo, or Sn; x, y, and z are each a number independently selected from 1 to 15, and the material being configured to impart anticorrosive and conductive properties to the substrate.

13. The bipolar plate of claim 12 , wherein the surface portion further comprises a dopant including at least one of N, C, or F.

14. The bipolar plate of claim 12 , wherein an interfacial contact resistance between the substrate and the material is less than 0.01 Ohm cm 2 .

15. The bipolar plate of claim 12 , wherein electrical conductivity of the material is greater than 100 S cm −1 .

16. The bipolar plate of claim 12 , wherein the corrosion resistance of the bipolar plate is less than 10 μA cm −2 at about 80° C., at pH of 2-3, with the presence of 0.1 ppm of HF in the solution.

17. An anticorrosive and conductive substrate comprising:
a bulk portion; and
a surface portion material including a binary phosphide, ternary phosphide, or both having formulas (I) and (II):
A x P y   (I),

A x B z P y   (II),

where A and B are each V, Cr, Ni, Zr, Nb, Mo, or Sn; and x, y, and z are each a number independently selected from 1 to 15, such that the surface portion material is configured to impart corrosion resistance of less than 10 μA cm −2 at about 80° C., at pH of 2-3, with the presence of 0.1 ppm of HF in the solution and electrical conductivity greater than about 100 S cm −1 to the substrate.

18. The substrate of claim 17 , wherein the surface portion material includes both the binary and the ternary phosphide.

19. The substrate of claim 18 , wherein A in both the binary and ternary phosphides is the same element.

20. The substrate of claim 17 , wherein the surface portion material further comprises a dopant including at least one of N, C, or F.

Assignees

• Bosch Gmbh Robert

Inventors

• Kim Soo
• Cheng Lei
• Samsonidze Georgy
• Kornbluth Mordechai
• Mailoa Jonathan
• Hellstrom Sondra
• Kozinsky Boris
• Craig Nathan

Classifications

• H01M8/0228 Primary

  in the form of layered or coated products · CPC title

• H01M8/0297

  Arrangements for joining electrodes, reservoir layers, heat exchange units or bipolar separators to each other (H01M8/0271 takes precedence) · CPC title

• Y02E60/50

  Fuel cells · CPC title

• C01B25/088

  containing plural metal · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title